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Clinics ; 76: e2683, 2021. graf
Article in English | LILACS | ID: biblio-1249591


OBJECTIVES: Ischemia and reperfusion (I/R) in the intestine could lead to severe endothelial injury, compromising intestinal motility. Reportedly, estradiol can control local and systemic inflammation induced by I/R injury. Thus, we investigated the effects of estradiol treatment on local repercussions in an intestinal I/R model. METHODS: Rats were subjected to ischemia via the occlusion of the superior mesenteric artery (45 min) followed by reperfusion (2h). Thirty minutes after ischemia induction (E30), 17β-estradiol (E2) was administered as a single dose (280 μg/kg, intravenous). Sham-operated animals were used as controls. RESULTS: I/R injury decreased intestinal motility and increased intestinal permeability, accompanied by reduced mesenteric endothelial nitric oxide synthase (eNOS) and endothelin (ET) protein expression. Additionally, the levels of serum injury markers and inflammatory mediators were elevated. Estradiol treatment improved intestinal motility, reduced intestinal permeability, and increased eNOS and ET expression. Levels of injury markers and inflammatory mediators were also reduced following estradiol treatment. CONCLUSION: Collectively, our findings indicate that estradiol treatment can modulate the deleterious intestinal effects of I/R injury. Thus, estradiol mediates the improvement in gut barrier functions and prevents intestinal dysfunction, which may reduce the systemic inflammatory response.

Animals , Male , Rats , Reperfusion Injury/prevention & control , Reperfusion Injury/drug therapy , Estradiol/pharmacology , Permeability , Reperfusion , Estrogens , Intestines , Ischemia
Rev. bras. ginecol. obstet ; 41(12): 703-709, Dec. 2019. tab, graf
Article in English | LILACS | ID: biblio-1057889


Abstract Objective To investigate the action of testosterone (T), isolated or associated with estradiol benzoate (EB), on the proliferation markers and apoptosis of breasts of ovariectomized rats. Methods A total of 48 castrated female Wistar rats were divided into 6 groups, and each of them were submitted to one of the following treatments for 5 weeks: 1) control; 2) EB 50 mcg/day + T 50 mcg/day; 3) T 50mcg/day; 4) EB 50 mcg +T 300 mcg/day; 5) T 300 mcg/day; and 6) EB 50 mcg/day. After the treatment, the mammary tissue was submitted to a histological analysis and immunoexpression evaluation of proliferation markers (proliferating cell nuclear antigen, PCNA) and apoptosis (caspase-3). Results There was a statistically significant difference among the groups regarding microcalcifications and secretory activity, with higher prevalence in the groups treated with EB. There was no difference among the groups regarding atrophy, but a higher prevalence of atrophy was found in the groups that received T versus those that received EB +T. There was a difference among the groups regarding the PCNA (p = 0.028), with higher expression in the group submitted to EB +T 300 mcg/day. Regarding caspase-3, there was no difference among the groups; however, in the group submitted to EB +T 300 mcg/day, the expression was higher than in the isolated T group. Conclusion Isolated T did not have a proliferative effect on the mammary tissue, contrary to EB. Testosterone in combination with EB may or may not decrease the proliferation, depending on the dose of T.

Resumo Objetivo Investigar a ação da testosterona (T) isolada ou associada ao benzoato de estradiol (EB) na proliferação e apoptose de mamas de ratas ovariectomizadas. Métodos Um total de 48 ratas Wistar castradas foram divididas em 6 grupos, e cada um foi submetido a um dos seguintes tratamentos durante 5 semanas: 1) controle; 2) BE 50 mcg/dia + T 50mcg/dia; 3) T 50 mcg/dia; 4) BE 50 mcg + T 300mcg/dia; e) T 300 mcg/dia; e f) BE 50 mcg/dia. Após o tratamento, o tecido mamário foi submetido a análise histológica e avaliação de imunoexpressão de marcadores de proliferação (antígeno nuclear de células proliferantes, PCNA) e apoptose (caspase-3). Resultados Houve diferença estatisticamente significante entre os grupos com relação às microcalcificações e à atividade secretora, com maior prevalência nos grupos tratados com BE. Não houve diferença entre os grupos quanto à atrofia, mas houve maior prevalência de atrofia nos grupos que receberam T versus os que receberam BE+ T. Houve diferença entre os grupos quanto ao ANCP (p= 0,028), com maior expressão no grupo BE+ T 300 mcg/dia. Com relação à caspase-3, não houve diferença entre os grupos, mas, no grupo BE+ T 300 mcg/dia, a expressão foi maior do que no grupo de T isolada. Conclusão A T isolada não apresentou efeito proliferativo do tecido mamário, contrariamente ao EB. A T em associação ao EB pode diminuir ou não a proliferação, a depender da dose de T.

Animals , Female , Testosterone/pharmacology , Breast/cytology , Apoptosis/drug effects , Cell Proliferation/drug effects , Breast/pathology , Calcinosis/pathology , Ovariectomy , Biomarkers/analysis , Rats, Wistar , Proliferating Cell Nuclear Antigen/analysis , Estradiol/analogs & derivatives , Estradiol/pharmacology , Caspase 3/analysis
Int. j. odontostomatol. (Print) ; 13(4): 418-427, dic. 2019. graf
Article in English | LILACS | ID: biblio-1056478


ABSTRACT: Tooth eruption requires resorption of the alveolar bone interposed between the tooth germ and the oral mucosa (coronal bone). The cells responsible for bone resorption are the osteoclasts and their activity can be reduced or inactivated by estrogen hormone. We aimed to investigate the effects of estrogen on the process of tooth eruption in rats. Thirty-three Wistar rats, aged two-to-17-days, were divided into control, sham and estrogen-treated groups. After daily injections with estrogen, the animals were euthanized and the jaws removed and processed for histological analysis. We performed clinical examination, morphological analysis, quantification of the number of osteoclasts on the surface of the coronal bone and immunohistochemical analysis of estrogen receptor type alpha (ERα). Estrogen therapy was effective, which could be confirmed by the higher estrogen plasma levels on treated animals. However, it had no effect on tooth development or tooth eruption. Progressive bone resorption was observed and the number of osteoclasts on coronal bone was not affected on hormoneinjected animals, allowing tooth to erupt at the same time observed in untreated animals. Immunohistochemistry for ERα confirmed the presence of this type of receptor in osteoclasts, osteoblasts and osteocytes. Taken together, our results showed that estrogen stimulation was not sufficient to decrease the number of osteoclasts on the coronal bone, supporting the idea that, although estrogen may have a protective activity on bone resorption, this may not apply to the alveolar bone that is meant to be resorbed during eruptive process.

RESUMEN: La erupción dental requiere la resorción del hueso alveolar interpuesto entre el germen dental y la mucosa oral (hueso coronal). Las células responsables de la resorción ósea son los osteoclastos y su actividad puede reducirse o inactivarse por la hormona del estrógeno. Objetivos: apuntamos a investigar los efectos del estrógeno en el proceso de la erupción dental en ratas. Treinta y tres ratas Wistar, de dos a 17 días de edad, se dividieron en grupos de control, Sham y se trataron con estrógenos. Los animales fueron eutanizados después del tratamento con estrógeno y se procesaron las mandíbulas para el análisis histológico. Se realizó el examen clínico, el análisis morfológico, la cuantificación del número de osteoclastos en la superficie del hueso coronal y el análisis inmunohistoquímico del tipo de receptor de estrógeno alfa (ERα). La terapia de estrógeno fue eficaz, lo que podría ser confirmado por los niveles plasmáticos más altos de estrógeno en los animales tratados. Sin embargo, no se observó ningún efecto sobre el desarrollo de los dientes o la erupción dental. Se observó una resorción ósea progresiva y el número de osteoclastos en el hueso coronal no se vio afectado en los animales inyectados con hormonas, permitiendo que el diente erupcionó durante el mismo período de tiempo observado en animales no tratados. La inmunohistoquímica para el ERα confirmó la presencia de este tipo de receptor en los osteoclastos, osteoblastos y osteocitos. Nuestros resultados mostraron que la estimulación del estrógeno no fue suficiente para reducir el número de osteoclastos en el hueso coronal confirmando que, si bien el estrógeno puede tener una actividad protectora en la resorción ósea, esto puede no se aplica al hueso alveolar que está destinado a ser rerecurrido durante el proceso eruptivo.

Animals , Female , Rats , Tooth Eruption/physiology , Bone Resorption/physiopathology , Receptors, Estrogen , Bone Remodeling/physiology , Animal Experimentation , Osteoclasts , Immunohistochemistry/methods , Statistical Analysis , Ethics Committees , Rats, Wistar , Estradiol/pharmacology , Estrogens/administration & dosage , Estrogens/adverse effects , Estrogens/therapeutic use , Alveolar Process/physiology
Rev. bras. ginecol. obstet ; 41(7): 449-453, July 2019. tab
Article in English | LILACS | ID: biblio-1020606


Abstract Objective To analyze the effects of estrogen alone or in combination with progestogens and tibolone (TIB) on the expression of the extracellular matrix metalloproteinases 2 and 9 (MMP-2 and MMP-9), of perlecan, and of heparanase (HPSE) of the vascular walls of the carotid arteries. Methods A total of 30 250-day-old ovariectomized Wistar rats were orally treated for 5 weeks with: a) 1 mg/kg of estradiol benzoate (EB); b) EB + 0.2 mg/kg of medroxyprogesterone acetate (MPA); c) EB + 0.2mg/kg of norethisterone acetate (NETA); d) EB + 2 mg/kg of dydrogesterone (DI); e) 1 mg/kg of TIB; f) placebo (CTR). Following treatment, the expression of mRNA for MMP-2, MMP-9, and HPSE was analyzed by realtime polymerase chain-reaction (PCR), and the expression of MMP-2, of MMP-9, of tissue inhibitor of metalloproteinase 2 (TIMP-2), and of perlecan was quantified by immunohistochemistry in the carotid arteries. Results The groups showed significant differences on mRNA HPSE expression (p = 0.048), which was higher in the EB, EB + MPA, and TIB groups. There was no statistically significant difference in mRNA MMP-2 or MMP-9 expression. The immunohistochemical expression of MMP-2, of TIMP-2, of MMP-9, of HPSE, and of perlecan showed no differences between groups. Conclusion Estradiol alone or associated with MPA and TIB treatment can increase mRNA HSPE expression of the walls of the carotid arteries in ovariectomized rats.

Resumo Objetivo Analisar os efeitos do estrogênio isolado ou em combinação com progestogênios e tibolona (TIB) na expressão das metaloproteinases 2 e 9 da matriz extracelular (MMP-2 e MMP-9), da perlecan e da heparanase (HPSE) das paredes vasculares das artérias carótidas. Métodos Trinta ratas Wistar ovariectomizadas com 250 dias de idade foram tratadas oralmente por 5 semanas com: a) 1 mg/kg de benzoato de estradiol (EB); b) EB + 0,2 mg/kg de acetato de medroxiprogesterona (MPA); c) EB + 0,2mg/kg de acetato de noretisterona (NETA); d) EB + 2 mg/kg de didrogesterona (DI); e) 1 mg/kg de TIB; f) placebo (CTR). Após o tratamento, a expressão de mRNA para MMP-2, MMP- 9, e HPSE foi analisada por reação em cadeia da polimerase (RCP) em tempo real, e a expressão de MMP-2, MMP-9, inibidor tecidual de metaloproteinase 2 (TIMP-2), e de perlecan foi quantificado por imunohistoquímica em artérias carótidas. Resultados Os grupos apresentaram diferenças significativas na expressão do mRNA HPSE (p = 0,048), sendo maiores nos grupos EB, EB + MPA e TIB. Não houve diferença estatisticamente significativa nas expressões de mRNA MMP-2 ou MMP-9. A expressão imunohistoquímica de MMP-2, TIMP-2, MMP-9, HPSE e perlecan não mostrou diferenças entre os grupos. Conclusão O estradiol isolado ou associado ao tratamento com MPA e TIB pode aumentar a expressão de mRNA HSPE nas paredes das artérias carótidas em ratas ovariectomizadas.

Animals , Female , Rats , Progestins/pharmacology , Carotid Arteries/enzymology , Heparin Lyase/drug effects , Estradiol/analogs & derivatives , Contraceptive Agents, Hormonal/pharmacology , Norpregnenes/pharmacology , Progestins/administration & dosage , Ovariectomy , Carotid Arteries/drug effects , Estrogen Replacement Therapy , Gene Expression Regulation, Enzymologic/drug effects , Administration, Oral , Rats, Wistar , Heparin Lyase/genetics , Heparin Lyase/metabolism , Heparan Sulfate Proteoglycans/genetics , Heparan Sulfate Proteoglycans/metabolism , Matrix Metalloproteinase 2/drug effects , Matrix Metalloproteinase 2/genetics , Matrix Metalloproteinase 2/metabolism , Matrix Metalloproteinase 9/drug effects , Matrix Metalloproteinase 9/genetics , Matrix Metalloproteinase 9/metabolism , Models, Animal , Estradiol/administration & dosage , Estradiol/pharmacology , Contraceptive Agents, Hormonal/administration & dosage , Norpregnenes/administration & dosage
Biol. Res ; 50: 11, 2017. graf
Article in English | LILACS | ID: biblio-838967


BACKGROUND: Cimicifuga racemosa is one of the herbs used for the treatment of climacteric syndrome, and it has been cited as an alternative therapy to estrogen. Apart from hectic fevers, dyspareunia and so on, dry mouth also increase significantly after menopause. It has not yet been reported whether C. racemosa has any impact on the sublingual gland, which may relate to dry mouth. In an attempt to determine this, we have compared the effects of estrogen and C. racemosa on the sublingual gland of ovariectomized rats. RESULTS: HE staining showed that the acinar cell area had contracted and that the intercellular spaces were broadened in the OVX (ovariectomized rats) group, while treatment with estradiol (E2) and iCR (isopropanolic extract of C. racemosa) improved these lesions. Transmission electron microscopy showed that rough endoplasmic reticulum expansion in mucous and serous acinar epithelial cells and apoptotic cells was more commonly seen in the OVX group than in the SHAM (sham-operated rats) group. Mitochondria and plasma membrane infolding lesions in the striated ducts were also observed. These lesions were alleviated by both treatments. It is of note that, in the OVX + iCR group, the volume of mitochondria in the striated duct was larger than in other groups. Immunohistochemical staining showed that the ratio of caspase-3 positive cells was significantly increased in the acinar cells of the OVX group compared with the SHAM group (p < 0.05); and the MA (mean absorbance) of caspase-3 in the striated ducts also increased (p < 0.05). Estradiol decreased the ratio of caspase-3 positive cells and the MA of caspase-3 in striated ducts significantly (p < 0.05). ICR also reduced the ratio of caspase-3 positive cells and the MA in the striated ducts (p < 0.05), but the reduction of the MA in striated ducts was inferior to that of the OVX + E2 group (p < 0.05). CONCLUSION: Both estradiol and iCR can inhibit subcellular structural damage, and down-regulate the expression of caspase-3 caused by ovariectomy, but their effects were not identical, suggesting that both drugs confer a protective effect on the sublingual gland of ovariectomized rats, but that the specific location and mechanism of action producing these effects were different.

Animals , Female , Rats , Sublingual Gland/drug effects , Plant Extracts/pharmacology , Ovariectomy , Estradiol/pharmacology , Estrogens/pharmacology , Time Factors , Xerostomia/prevention & control , Climacteric/drug effects , Immunohistochemistry , Down-Regulation , Estrogen Replacement Therapy/methods , Reproducibility of Results , Treatment Outcome , Rats, Sprague-Dawley , Apoptosis/drug effects , Microscopy, Electron, Transmission , Caspase 3/analysis , Caspase 3/drug effects , Acinar Cells/drug effects
Acta cir. bras ; 31(10): 661-667, Oct. 2016. tab, graf
Article in English | LILACS | ID: biblio-827656


ABSTRACT PURPOSE: To develop a model for studying cerebrovascular disease prevention in elderly women. METHODS: Sixty 18-month-old Sprague Dawley (SD) rats were randomly divided into an estrogen administration group (EA, n=30) and a non-administration group (NA, n=30); thirty 4-month-old SD rats were allocated to a control group. The EA group received estradiol benzoate starting on the 5th day of a 34-day breeding period, and the serum levels of estradiol (E2), estrogen receptor (ER), and malondialdehyde (MDA) were measured. The MCA of each group was then sampled for viscoelastic experiments. RESULTS: The serum levels of E2 and MDA in the EA group showed significant differences compared to those in the control group (p<0.05), while the difference in ER between the EA and control groups was not significant (p>0.05). The decrease in MCA stress at 7,200 s and the increase in strain at 7,200 s in the EA group showed no significant differences compared to the control group (p>0.05). CONCLUSION: Estradiol administration inhibited the formation of lipid peroxidation products and restored middle cerebral arterial viscoelasticity in aged female rats.

Animals , Female , Middle Cerebral Artery/drug effects , Estradiol/analogs & derivatives , Estrogens/pharmacology , Reference Values , Time Factors , Viscosity/drug effects , Lipid Peroxidation/drug effects , Random Allocation , Receptors, Estradiol/blood , Rats, Sprague-Dawley , Middle Cerebral Artery/physiology , Elasticity/drug effects , Estradiol/administration & dosage , Estradiol/blood , Estradiol/pharmacology , Estrogens/administration & dosage , Malondialdehyde/blood
Braz. j. med. biol. res ; 49(5): e5058, 2016. tab, graf
Article in English | LILACS | ID: biblio-951680


The relaxation of coronary arteries by estrogens in the coronary vascular beds of naive and hypertensive rats has been well described. However, little is known about this action in gonadectomized rats. We investigated the effect of 17-ß-estradiol (E2) in coronary arteries from gonadectomized rats, as well as the contributions of endothelium-derived factors and potassium channels. Eight-week-old female and male Wistar rats weighing 220-300 g were divided into sham-operated and gonadectomized groups (n=9−12 animals per group). The baseline coronary perfusion pressure (CPP) was determined, and the vasoactive effects of 10 μM E2 were assessed by bolus administration before and after endothelium denudation or by perfusion with NG-nitro-L-arginine methyl ester (L-NAME), indomethacin, clotrimazole, L-NAME plus indomethacin, L-NAME plus clotrimazole or tetraethylammonium (TEA). The CPP differed significantly between the female and sham-operated male animals. Gonadectomy reduced the CPP only in female rats. Differences in E2-induced relaxation were observed between the female and male animals, but male castration did not alter this response. For both sexes, the relaxation response to E2 was, at least partly, endothelium-dependent. The response to E2 was reduced only in the sham-operated female rats treated with L-NAME. However, in the presence of indomethacin, clotrimazole, L-NAME plus indomethacin or L-NAME plus clotrimazole, or TEA, the E2 response was significantly reduced in all groups. These results highlight the importance of prostacyclin, endothelium-derived hyperpolarizing factor, and potassium channels in the relaxation response of coronary arteries to E2 in all groups, whereas nitric oxide may have had an important role only in the sham-operated female group.

Animals , Male , Female , Rats , Gonadal Steroid Hormones/deficiency , Vasodilation/drug effects , Vasodilator Agents/pharmacology , Endothelium, Vascular/drug effects , Coronary Vessels/drug effects , Estradiol/pharmacology , Heart/drug effects , Endothelium, Vascular/physiology , Orchiectomy , Ovariectomy , Rats, Wistar , Coronary Vessels/physiology
Biol. Res ; 49: 1-13, 2016. ilus, graf, tab
Article in English | LILACS | ID: biblio-950869


BACKGROUND: Computer-based technology is becoming increasingly essential in biological research where drug discovery programs start with the identification of suitable drug targets. 2-Methoxyestradiol (2ME2) is a 17ß-estradiol metabolite that induces apoptosis in various cancer cell lines including cervical cancer, breast cancer and multiple myeloma. Owing to 2ME2's poor in vivo bioavailability, our laboratory in silico-designed and subsequently synthesized a novel 2ME2 analogue, 2-ethyl-3-O-sulphamoyl-estra-1,3,5(10),15-tetraen-17-ol (ESE-15-ol), using receptor- and ligand molecular modeling. In this study, the biological effects of ESE-15-ol (180 nM) and its parent molecule, 2ME2 (1 µM), were assessed on morphology and apoptosis induction in cervical cancer cells. RESULTS: Transmission electron microscopy, scanning electron microscopy and polarization-optical transmitted light differential interference contrast (PlasDIC) images demonstrated morphological hallmarks of apoptosis including apoptotic bodies, shrunken cells, vacuoles, reduced cell density and cell debris. Flow cytometry analysis showed apoptosis induction by means of annexin V-FITC staining. Cell cycle analysis showed that ESE-15-ol exposure resulted in a statistically significant increase in the G2M phase (72%) compared to 2ME2 (19%). Apoptosis induction was more pronounced when cells were exposed to ESE-15-ol compared to 2ME2. Spectrophotometric analysis of caspase 8 activity demonstrated that 2ME2 and ESE-15-ol both induced caspase 8 activation by 2- and 1.7-fold respectively indicating the induction of the apoptosis. However, ESE-15-ol exerted all of the above-mentioned effects at a much lower pharmacological concentration (180 nM) compared to 2ME2 (1 µM physiological concentration). CONCLUSION: Computer-based technology is essential in drug discovery and together with in vitro studies for the evaluation of these in silico-designed compounds, drug development can be improved to be cost effective and time consuming. This study evaluated the anticancer potential of ESE-15-ol, an in silico-designed compound in vitro. Research demonstrated that ESE-15-ol exerts antiproliferative activity accompanied with apoptosis induction at a nanomolar concentration compared to the micromolar range required by 2ME2. This study is the first study to demonstrate the influence of ESE-15-ol on morphology, cell cycle progression and apoptosis induction in HeLa cells. In silico-design by means of receptor- and ligand molecular modeling is thus effective in improving compound bioavailability while preserving apoptotic activity in vitro.

Humans , Female , Sulfonamides/pharmacology , Carbonic Anhydrase Inhibitors/pharmacology , Uterine Cervical Neoplasms/drug therapy , Computer-Aided Design , Estradiol/analogs & derivatives , Antineoplastic Agents/pharmacology , Time Factors , HeLa Cells , Microscopy, Electron, Scanning , Cell Cycle/drug effects , Cell Cycle/physiology , Cells, Cultured , Uterine Cervical Neoplasms/pathology , Reproducibility of Results , Apoptosis/drug effects , Culture Media , Microscopy, Electron, Transmission , Estradiol/pharmacology , Caspase 8/metabolism , Flow Cytometry/methods , 2-Methoxyestradiol , Microscopy, Polarization
Braz. j. med. biol. res ; 48(11): 1004-1009, Nov. 2015. tab, graf
Article in English | LILACS | ID: lil-762903


Sex hormones from environmental and physiological sources might play a major role in the pathogenesis of hepatoblastoma in children. This study investigated the effects of estradiol and bisphenol A on the proliferation and telomerase activity of human hepatoblastoma HepG2 cells. The cells were divided into 6 treatment groups: control, bisphenol A, estradiol, anti-estrogen ICI 182,780 (hereinafter ICI), bisphenol A+ICI, and estradiol+ICI. Cell proliferation was measured based on average absorbance using the Cell Counting-8 assay. The cell cycle distribution and apoptotic index were determined by flow cytometry. Telomerase activity was detected by polymerase chain reaction and a telomeric repeat amplification protocol assay. A higher cell density was observed in bisphenol A (P<0.01) and estradiol (P<0.05) groups compared with the control group. Cell numbers in S and G2/M phases after treatment for 48 h were higher (P<0.05), while the apoptotic index was lower (P<0.05) and telomerase activities at 48 and 72 h (P<0.05) were higher in these groups than in the control group. The cell density was also higher in bisphenol A+ICI (P<0.01) and estradiol+ICI (P<0.05) groups compared with the ICI group. Furthermore, cell numbers were increased in S and G2/M phases (P<0.05), while the apoptotic index was lower (P<0.05) and telomerase activities at 48 and 72 h were higher (P<0.05) in these groups than in the ICI group. Therefore, bisphenol A and estradiol promote HepG2 cell proliferation in vitro by inhibition of apoptosis and stimulation of telomerase activity via an estrogen receptor-dependent pathway.

Humans , Benzhydryl Compounds/pharmacology , Cell Proliferation/drug effects , Estradiol/pharmacology , Estrogen Receptor Antagonists/pharmacology , Estrogens, Non-Steroidal/pharmacology , /drug effects , Phenols/pharmacology , Telomerase/drug effects , Apoptosis/drug effects , Cell Survival/drug effects , Estradiol/analogs & derivatives , Flow Cytometry , /enzymology , Interphase/drug effects , Telomerase/metabolism
Clinics ; 70(5): 313-317, 05/2015. tab, graf
Article in English | LILACS | ID: lil-748277


OBJECTIVES: To determine the serum interleukin-17 (IL-17) levels in childhood-onset systemic lupus erythematosus patients and to evaluate the association between IL-17 and clinical manifestations, disease activity, laboratory findings and treatment. METHODS: We included 67 consecutive childhood-onset systemic lupus erythematosus patients [61 women; median age 18 years (range 11-31)], 55 first-degree relatives [50 women; median age 40 years (range 29-52)] and 47 age- and sex-matched healthy controls [42 women; median age 19 years (range 6-30)]. The childhood-onset systemic lupus erythematosus patients were assessed for clinical and laboratory systemic lupus erythematosus manifestations, disease activity [Systemic Lupus Erythematosus Disease Activity Index (SLEDAI)], cumulative damage [Systemic Lupus International Collaborating Clinics/American College of Rheumatology (ACR) Damage Index] and current drug use. Serum IL-17 levels were measured by an enzyme-linked immunosorbent assay using commercial kits. RESULTS: The median serum IL-17 level was 36.3 (range 17.36-105.92) pg/mL in childhood-onset systemic lupus erythematosus patients and 29.47 (15.16-62.17) pg/mL in healthy controls (p=0.009). We observed an association between serum IL-17 levels and active nephritis (p=0.01) and migraines (p=0.03). Serum IL-17 levels were not associated with disease activity (p=0.32), cumulative damage (p=0.34), or medication use (p=0.63). CONCLUSION: IL-17 is increased in childhood-onset systemic lupus erythematosus and may play a role in the pathogenesis of neuropsychiatric and renal manifestations. Longitudinal studies are necessary to determine the role of IL-17 in childhood-onset systemic lupus erythematosus. .

Female , Humans , Middle Aged , Affect/physiology , Brain/physiology , Estrogens/physiology , Memory, Short-Term/physiology , Menopause/physiology , Menopause/psychology , Serotonin/physiology , Administration, Cutaneous , Administration, Oral , Amino Acids/administration & dosage , Amino Acids/pharmacology , Brain/drug effects , Brain/metabolism , Cross-Over Studies , Double-Blind Method , Estradiol/administration & dosage , Estradiol/blood , Estradiol/pharmacology , Functional Neuroimaging/methods , Functional Neuroimaging/psychology , Magnetic Resonance Imaging/methods , Magnetic Resonance Imaging/psychology , Psychomotor Performance/physiology , Serotonin/metabolism , Tryptophan/administration & dosage , Tryptophan/blood , Tryptophan/pharmacology
Article in English | WPRIM | ID: wpr-66448


This study was conducted to evaluate the influence of category (heifers, primiparous or multiparous cows) on pregnancy rates in a large scale resynchronization ovulation program. Nelore heifers (n = 903), primiparous lactating cows (n = 338) and multiparous lactating cows (n = 1,223) were synchronized using a conventional protocol of estradiol/P4-based fixed-time artificial insemination (FTAI). Thirty days after ultrasonography, females who failed the first FTAI were resynchronized with the same hormonal protocol prior to a second FTAI. The pregnancy status of each cohort was evaluated by ultrasonography 30 days after each FTAI. The average conception rate after the first FTAI and resynchronization was 80.5%. Heifers had a higher conception rate (85%) than primiparous (76%) or multiparous cows (78%; p = 0.0001). The conception rate after the first FTAI was similar among heifers (57%), primiparous cows (51%) and multiparous cows (56%; p = 0.193). After the second FTAI, heifers exhibited a higher conception rate (66%) than primiparous or multiparous cows (51%; p = 0.0001). These results demonstrate the feasibility of resynchronization in large beef herds for providing consistent pregnancy rates in a short period of time. We also demonstrated that ovulation resynchronization 30 days after FTAI is particularly effective for heifers, providing a conception rate of up to 66%.

Animals , Brazil , Cattle , Estradiol/pharmacology , Estrus Synchronization , Female , Fertilization/drug effects , Insemination, Artificial/veterinary , Lactation , Parity , Pregnancy , Pregnancy Rate , Progesterone/pharmacology
Braz. dent. j ; 25(5): 372-378, Sep-Oct/2014. tab, graf
Article in English | LILACS | ID: lil-731053


This study aimed to evaluate the immunoexpression of glucose transporters 1 (GLUT-1) and 3 (GLUT-3) in metastatic and non-metastatic lower lip squamous cell carcinoma (LLSCC). Twenty LLSCCs with regional nodal metastasis and 20 LLSCCs without metastasis were selected. The distribution of staining and the percentage of GLUT-1 and GLUT-3 staining in each tumor core and at the deep invasive front were assessed. Most tumors (70%) exhibited peripheral staining for GLUT-1 in nests, sheets and islands of neoplastic cells, whereas predominantly central staining was observed for GLUT-3 (72.5%). A high percentage of GLUT-1-positive cells was observed at the deep invasive front and in the tumor core of metastatic and non-metastatic tumors (p>0.05). The percentage of GLUT-1-positive cells was much higher than that of GLUT-3-positive cells both in the deep invasive front (p<0.001) and in the tumor core (p<0.001) of LLSCCs. No significant differences in the percentage of GLUT-1- and GLUT-3-positive cells were observed according to nodal metastasis, clinical stage or histological grade of malignancy (p>0.05). In conclusion, the results of the present study suggest an important role of GLUT-1 in glucose uptake in LLSCCs, although this protein does not seem to be involved in the progression of these tumors. On the other hand, GLUT-3 expression may represent a secondary glucose uptake mechanism in LLSCCs.

Este estudo objetivou avaliar a imunoexpressão dos transportadores de glicose 1 (GLUT-1) e 3 (GLUT-3) em carcinomas de células escamosas de lábio inferior (CCELI) metastáticos e não-metastáticos. Vinte CCELIs com metástase nodal regional e 20 CCELI sem metástase foram selecionados. Foram analisados a distribuição da imunomarcação e o percentual de imunorreatividade para GLUT-1 e GLUT-3 no centro tumoral e no front de invasão tumoral. A maioria dos tumores (70%) revelou marcação para GLUT-1 em áreas periféricas dos ninhos, lençóis e ilhas de células neoplásicas, ao passo que GLUT-3 revelou predomínio de marcação em áreas centrais (72.5%). Um alto percentual de células positivas para GLUT-1 foi observado no front de invasão e no centro tumoral das lesões metastáticas e não-metastáticas (p>0,05). O percentual de células positivas para GLUT-1 foi superior ao percentual de células positivas para GLUT-3, tanto no front de invasão (p<0,001) quanto no centro tumoral (p<0,001) dos CCELIs. Não foram observadas diferenças significativas no percentual de células positivas para GLUT-1 e GLUT-3 em relação à mestástase nodal, ao estádio clínico ou ao grau histológico de malignidade (p>0,05). Em conclusão, os resultados do presente estudo sugerem um importante papel para GLUT-1 na absorção de glicose nos CCELIs, embora esta proteína não pareça estar envolvida na progressão destes tumores. Por outro lado, a expressão de GLUT-3 pode representar um mecanismo secundário para a absorção de glicose nos CCELIs.

Animals , Female , Male , Rats , Estradiol/pharmacology , Hepatocytes/drug effects , Oxidative Stress , Apoptosis/physiology , bcl-X Protein , Cells, Cultured , Flow Cytometry , Hepatocytes/metabolism , L-Lactate Dehydrogenase/metabolism , Lipid Peroxidation , /metabolism , Rats, Wistar , Thiobarbituric Acid Reactive Substances/metabolism
Braz. j. med. biol. res ; 47(6): 505-514, 06/2014. tab, graf
Article in English | LILACS | ID: lil-709447


Cocaine sensitization is a marker for some facets of addiction, is greater in female rats, and may be influenced by their sex hormones. We compared the modulatory effects of endogenous or exogenous estradiol and progesterone on cocaine-induced behavioral sensitization in 106 female rats. Ovariectomized female rats received progesterone (0.5 mg/mL), estradiol (0.05 mg/mL), progesterone plus estradiol, or the oil vehicle. Sham-operated control females received oil. Control and acute subgroups received injections of saline, while the repeated group received cocaine (15 mg/kg, ip) for 8 days. After 10 days, the acute and repeated groups received a challenge dose of cocaine, after which locomotion and stereotypy were monitored. The estrous cycle phase was evaluated and blood was collected to verify hormone levels. Repeated cocaine treatment induced overall behavioral sensitization in female rats, with increased locomotion and stereotypies. In detailed analysis, ovariectomized rats showed no locomotor sensitization; however, the sensitization of stereotypies was maintained. Only females with endogenous estradiol and progesterone demonstrated increased locomotor activity after cocaine challenge. Estradiol replacement enhanced stereotyped behaviors after repeated cocaine administration. Cocaine sensitization of stereotyped behaviors in female rats was reduced after progesterone replacement, either alone or concomitant with estradiol. The behavioral responses (locomotion and stereotypy) to cocaine were affected differently, depending on whether the female hormones were of an endogenous or exogenous origin. Therefore, hormonal cycling appears to be an important factor in the sensitization of females. Although estradiol increases the risk of cocaine sensitization, progesterone warrants further study as a pharmacological treatment in the prevention of psychostimulant abuse.

Animals , Female , Central Nervous System Sensitization/drug effects , Cocaine/pharmacology , Estradiol/blood , Motor Activity/drug effects , Progesterone/blood , Stereotyped Behavior/drug effects , Analysis of Variance , Cocaine/administration & dosage , Estradiol/pharmacology , Estrous Cycle/blood , Hormone Replacement Therapy , Ovariectomy , Progesterone/pharmacology , Rats, Wistar , Sex Factors
Biol. Res ; 47: 1-7, 2014. ilus, graf
Article in English | LILACS | ID: biblio-950735


BACKGROUND: Novel, in silico-designed anticancer compounds were synthesized in our laboratory namely, 2-ethyl-3-O-sulphamoyl-estra-1,3,5(10),15-tetraen-17-ol (ESE-15-ol) and 2-ethyl-3-O-sulphamoyl-estra-1,3,5(10)16-tetraene (ESE-16). These compounds were designed to have improved bioavailability when compared to their source compound, 2-methoxyestradiol. This theoretically would be due to their increased binding affinity to carbonic anhydrase II, present in erythrocytes. Since the novel compounds under investigation are proposed to be transported within erythrocytes bound to carbonic anhydrase II, the morphological effect which they may exert on whole blood and erythrocytes is of great significance. A secondary outcome included revision of previously reported procedures for the handling of the whole blood sample. The purpose of this study was twofold. Firstly, the ultrastructural morphology of a healthy female's erythrocytes was examined via scanning electron microscopy (SEM) after exposure to the newly in silico-designed compounds. Morphology of erythrocytes following exposure to ESE-15-ol and ESE-16 for 3 minutes and 24 hours at 22°C were described with the use of SEM. The haemolytic activity of the compounds after 24 hours exposure were also determined with the ex vivo haemolysis assay. Secondly, storage conditions of the whole blood sample were investigated by determining morphological changes after a 24 hour storage period at 22°C and 37°C. RESULTS: No significant morphological changes were observed in the erythrocyte morphology after exposure to the novel anticancer compounds. Storage of the whole blood samples at 37°C for 24 hours resulted in visible morphological stress in the erythrocytes. Erythrocytes incubated at 22°C for 24 hours showed no structural deformity or distress. CONCLUSIONS: From this research the optimal temperature for ex vivo exposure of whole blood samples to ESE-15-ol and ESE-16 for 24 hours was determined to be 22°C. Data from this study revealed the potential of these compounds to be applied to ex vivo study techniques, since no damage occurred to erythrocytes ultrastructure under these conditions. As no structural changes were observed in erythrocytes exposed to ESE-15-ol and ESE-16, further ex vivo experiments will be conducted into the potential effects of these compounds on whole blood. Optimal incubation conditions up to 24 hours for whole blood were established as a secondary outcome.

Humans , Female , Middle Aged , Sulfonamides/pharmacology , Computer Simulation , Carbonic Anhydrase Inhibitors/pharmacology , Erythrocytes/drug effects , Estradiol/analogs & derivatives , Estrenes/pharmacology , Antineoplastic Agents/pharmacology , Sulfonamides/toxicity , Sulfonamides/pharmacokinetics , Temperature , Carbonic Anhydrase Inhibitors/pharmacokinetics , Biological Availability , Microscopy, Electron, Scanning , Carrier Proteins/pharmacology , Carrier Proteins/pharmacokinetics , Carbonic Anhydrase II/drug effects , Qualitative Research , Erythrocytes/ultrastructure , Estradiol/toxicity , Estradiol/pharmacology , Estradiol/pharmacokinetics , Estrenes/pharmacokinetics , Drug Discovery , Hemolysis/drug effects , Antineoplastic Agents/pharmacokinetics
Braz. j. med. biol. res ; 46(8): 700-707, ago. 2013. tab, graf
Article in English | LILACS | ID: lil-684532


Follicle cultures reproduce in vitro the functional features observed in vivo. In a search for an ideal model, we cultured bovine antral follicle wall sections (FWS) in a serum-free defined medium (DM) known to induce 17β-estradiol (E2) production, and in a nondefined medium (NDM) containing serum. Follicles were sectioned and cultured in NDM or DM for 24 or 48 h. Morphological features were determined by light microscopy. Gene expression of steroidogenic enzymes and follicle-stimulating hormone (FSH) receptor were determined by RT-PCR; progesterone (P4) and E2 concentrations in the media were measured by radioimmunoassay. DM, but not NDM, maintained an FWS morphology in vitro that was similar to fresh tissue. DM also induced an increase in the expression of all steroidogenic enzymes, except FSH receptor, but NDM did not. In both DM and NDM, there was a gradual increase in P4 throughout the culture period; however, P4 concentration was significantly higher in NDM. In both media, E2 concentration was increased at 24 h, followed by a decrease at 48 h. The E2:P4 ratio was higher in DM than in NDM. These results suggest that DM maintains morphological structure, upregulates the expression of steroidogenic enzyme genes, and maintains steroid production with a high E2:P4 ratio in FWS cultures.

Animals , Cattle , Female , Culture Media/pharmacology , Estradiol/pharmacology , Ovarian Follicle/drug effects , Progesterone/pharmacology , Tissue Culture Techniques , Analysis of Variance , Aromatase/genetics , Culture Media, Serum-Free , Cholesterol Side-Chain Cleavage Enzyme/genetics , Gene Expression , Ovarian Follicle/anatomy & histology , Phosphoproteins/genetics , Progesterone Reductase/genetics , Reverse Transcriptase Polymerase Chain Reaction , Receptors, FSH/genetics , /genetics
Acta cir. bras ; 28(8): 582-588, Aug. 2013. ilus, graf
Article in English | LILACS | ID: lil-680612


PURPOSE:To investigate the effects of classical acupuncture (Ac) and electroacupuncture (EAc) on estradiol-induced inflammation and oxidative stress in health rodents. METHODS: Twenty-four eight-week old female rats were treated with estradiol valerate (EV) 4.0 mg i.m. single dose and randomly assigned to four groups (n=6): G1(control), G2 (Ac), G3 (EAc 2 Hz) and G4 (EAc 100 Hz). After 60 days all rats were anesthetized with chloral hydrate 10% (0.1 ml/30 g weight of the animal) and submitted to Ac/EAc for twenty minutes. The procedures were repeated on days three, five, seven and nine of the study. The equivalent of the human right ST-36 (Zusanli) and SP-6 (Sanyinjiao) acupoints were chosen for needling and electrical stimulation. On the 10th day of the experiment, all rats were anesthetized for collection of blood and tissues (ovaries) samples for biochemical analysis and histological examination. RESULTS:Glutathione (GSH) and malonaldehyde (MDA) concentrations increased significantly in all groups (plasma and ovary) while myeloperoxidase (MPO) activity decreased significantly in all groups compared with control group (G1). CONCLUSIONS:Both classical acupuncture and electroacupuncture decrease systemic and local oxidative stress and ovary inflammation in healthy rats exposed to estrogenic stimulation. EAc enhances lipid peroxidation at systemic and local levels in female rats exposed to estrogenic stimulation.

Animals , Female , Rats , Acupuncture Points , Electroacupuncture/methods , Oxidative Stress , Oophoritis/therapy , Ovary/drug effects , Estradiol/analogs & derivatives , Estradiol/pharmacology , Estrogens/pharmacology , Glutathione/analysis , Lipid Peroxidation , Malondialdehyde/analysis , Oophoritis/chemically induced , Ovary/pathology , Peroxidase/analysis , Random Allocation , Rats, Wistar , Reproducibility of Results , Time Factors
Rio de Janeiro; s.n; 2013. 141 p. ilus, tab.
Thesis in Portuguese | LILACS | ID: lil-716894


A ação que o estrogênio desempenha sobre o endotélio depende da integridade deste e consequentemente das características clínicas de cada indivíduo. O uso da terapia hormonal da menopausa (THM) em mulheres com baixo risco cardiovascular geralmente resulta em efeitos benéficos, desde que iniciado em um período próximo da menopausa. Em contrapartida, o seu uso em mulheres com alto risco cardiovascular, como diabéticas ou portadoras de lesões ateroscleróticas já estabelecidas, e ainda naquelas com início da THM em um período superior a dez anos da menopausa geralmente resulta em efeitos maléficos. Nosso objetivo é avaliar os efeitos do estrogênio sobre a função endotelial em mulheres com sobrepeso ou obesidade, ou seja, indivíduos com risco cardiovascular intermediário. Para isso, 44 mulheres na pós-menopausa com idade entre 47 a 55 anos e índice de massa corporal (IMC) de 27,5 a 34,9kg/m², foram randomizadas nos grupos placebo (P) e estrogênio transdérmico (ET). A intervenção consistiu no uso transdérmico de estradiol, 1mg por dia, por um período de três meses. As participantes realizaram avaliação da reatividade endotelial em repouso e após isquemia [pletismografia por oclusão venosa (POV), com medidas do fluxo sanguíneo do antebraço (FSA) e videocapilaroscopia dinâmica do leito periungueal (VCLP), com medidas da velocidade de deslocamento das hemácias (VDH)], dosagens de moléculas de adesão [E-selectina, molécula de adesão intercelular (ICAM-1) e molécula de adesão vascular (VCAM-1)], aferição da sensibilidade insulínica [através do homeostatic model assessment of insulin resistance (HOMA-IR) e área sob a curva (AUC) da insulina durante o teste oral de tolerância à glicose (TOTG)] e mensurações das viscosidades sanguínea e plasmática. As participantes apresentaram idade de 51,77 ± 2,3 anos, IMC de 31,52 ± 2,54 kg/m² e tempo de menopausa de 3 [2-5] anos. O grupo P não apresentou nenhuma mudança significativa em qualquer variável. Após a intervenção, o grupo ...

The action that estrogen plays on the endothelium depends on its integrity and consequently on the clinical characteristics of each individual. The use of menopausal hormone therapy (MHT) in women with low cardiovascular risk usually results in beneficial effects, since it is started in a period close to menopause. In contrast, its use often results in harmful effects in women at high cardiovascular risk, such as diabetic ones or those with established atherosclerotic lesions, and even in those that the beginning of MHT exceeds ten years from menopause. Our goal is to evaluate the effects of estrogen on endothelial function in overweight women, ie, individuals at intermediate cardiovascular risk. For this purpose, 44 postmenopausal women, aged 47-55 years with body mass index (BMI) from 27.5 to 34.9 kg / m², were randomized into placebo (P) and transdermal estrogen (TE) groups. The intervention consisted of using transdermal estradiol 1mg per day for a period of three months. Participants underwent endothelial reactivity assessment at rest and after ischemia [by venous occlusion plethysmography (VOP), with assessment of forearm blood flow (FBF) and dynamic nailfold videocapillaroscopy (DNV), with assessment of red blood cell velocity (RBCV)], measurements of soluble adhesion molecules [E-selectin, intercellular adhesion molecule (ICAM-1) and vascular cell adhesion molecule (VCAM-1)], measurement of insulin sensitivity [by homeostatic model assessment of insulin resistance (HOMA-IR) and area under the curve (AUC) of insulin during the oral glucose tolerance test (OGTT)] and measurements of blood and plasma viscosities. The participants aged 51.77 ± 2.3 years, BMI 31.52 ± 2.54 kg/m² and had a time since menopause of 3 [2-5] years. P group showed no significant change in any variable. After intervention, the TE group compared to the baseline presented in DNV lower time taken to reach RBCV during post-occlusive reactive hyperemia (PORH) (4,0 [3,25-5,0] vs. 5,0 ...

Humans , Female , Endothelium , Estradiol/administration & dosage , Estradiol/pharmacology , Obesity , Administration, Cutaneous , Cardiovascular Diseases/prevention & control , Estrogen Replacement Therapy , Estrogens/pharmacology , Insulin Resistance , Postmenopause , Risk Factors
Braz. j. med. biol. res ; 45(12): 1248-1254, Dec. 2012. ilus, tab
Article in English | LILACS | ID: lil-659638


Little is known about age-related differences in short-term effects of estradiol on ischemia-reperfusion (I/R) insults. The present study was designed to evaluate the effects of short-term treatment with estradiol on reperfusion arrhythmias in isolated hearts of 6-7-week-old and 12-14-month-old female rats. Wistar rats were sham-operated, ovariectomized and treated with vehicle or ovariectomized and treated with 17β-estradiol (E2; 5 µg·100 g-1·day-1) for 4 days. Hearts were perfused by the Langendorff technique. Reperfusion arrhythmias, i.e., ventricular tachycardia and/or ventricular fibrillation, were induced by 15 min of left coronary artery ligation and 30 min of reperfusion. The duration and incidence of I/R arrhythmias were significantly higher in young rats compared to middle-aged rats (arrhythmia severity index: 9.4 ± 1.0 vs 3.0 ± 0.3 arbitrary units, respectively, P < 0.05). In addition, middle-aged rats showed lower heart rate, systolic tension and coronary flow. Four-day E2 treatment caused an increase in uterine weight. Although E2 administration had no significant effect on the duration of I/R arrhythmias in middle-aged rats, it induced a marked reduction in the rhythm disturbances of young rats accompanied by a decrease in heart rate of isolated hearts. Also, this reduction was associated with an increase in QT interval. No significant changes were observed in the QT interval of middle-aged E2-treated rats. These data demonstrate that short-term estradiol treatment protects against I/R arrhythmias in hearts of young female rats. The anti-arrhythmogenic effect of estradiol might be related to a lengthening of the QT interval.

Animals , Female , Arrhythmias, Cardiac/prevention & control , Estradiol/pharmacology , Myocardial Reperfusion Injury/physiopathology , Age Factors , Arrhythmias, Cardiac/physiopathology , Coronary Circulation/drug effects , Coronary Circulation/physiology , Electrocardiography , Estradiol/administration & dosage , Ovariectomy , Rats, Wistar , Ventricular Function, Left/drug effects
Braz. j. vet. res. anim. sci ; 49(4): 277-284, 2012.
Article in English | LILACS | ID: lil-687623


The present study was conducted to verify if the elevation of plasma concentrations of estradiol during superovulatory treatments affects the oocyte transport in buffalo females, as well as if the inferior quality of buffalo oocytes and/or some functional difference on the oviduct of these animals is responsible for the low embryo recovery rate in superovulated buffaloes when compared to cows subjected to the same treatment. Oviducts of 10 buffaloes and 15 of cows, treated to induce a single ovulation were used. The oviducts were placed on Petri dishes and received the following treatments: 5 buffalo oocytes with no E2 (G-BufBuf and G-BovBuf), 5 bovine oocytes with no E2 (G-BufBov and G-BovBov), 5 buffalo oocytes with E2 (G-BufE2Buf and G-BovE2Buf) and 5 bovine oocytes with E2 (G-BufE2Bov and G-BovE2Bov; factorial 2x2x2). Oocytes were incubated for 24h. Subsequently, oviducts were washed and oocytes were recovered and counted. Since no interactions were found between E2 treatment, oviducts and oocytes species, main effects were analyzed separately. Recovery rate and number of oocytes was higher on cattle compared to buffaloes (35.0+8.6% and 1.4+0.3 vs. 10.0±4.6% and 0.5±0.2, respectively; p<0.05); no effect of E2 treatment was observed on recovery rate and number of oocytes (29.8±9.0% and 1.3±0.4 vs. 16.9±6.1% and 0.7±0.2, respectively; p>0.05); the number of buffaloes and bovine oocytes recovered were similar (1.4±0.4 and 0.6±0.2, respectively; p>0.05). Oocytes recovery rate showed a trend (P=0.07) to be higher when buffalo oocytes were implanted when compared to bovine oocytes (35.2±9.2% vs. 12.9±5.4%). Present results suggest that oocyte transport by the oviduct of buffaloes and bovine was not dependent on oocytes species or E2 supplementation to the culture medium.

O presente estudo foi realizado para verificar se a elevação das concentrações plasmáticas de estradiol durante os tratamentos superovulatórios afeta o transporte dos oócitos em fêmeas bubalinas, bem como se a qualidade inferior dos oócitos de búfalos e/ou alguma diferença funcional no oviduto destes animais é responsável pela baixa taxa de recuperação de embriões em búfalas superovuladas quando comparadas a vacas submetidas ao mesmo tratamento. Foram utilizados 10 ovidutos de búfalas e 15 de vacas, tratadas para a indução de ovulação única. Os ovidutos foram colocados em placas de Petri e receberam os seguintes tratamentos: sem E2 e inseridos com 5 oócitos de búfalas (G-BufBuf e G-BovBuf); sem E2 e com 5 oócitos de vacas (G-BufBov e G-BovBov); com E2 e com 5 oócitos de búfalas (G-BufE2Buf e G-BovE2Buf); e com E2 e com 5 oócitos de vacas (G-BufE2Bov e G-BovE2Bov; fatorial 2x2x2). Posteriormente, foram incubados por 24h e, após esse período, foram lavados para a recuperação e contagem dos oócitos. Como não foi verificado efeito de interação, foram analisados os efeitos principais. O número e a taxa de recuperação de oócitos foi maior em ovidutos de vacas que de búfalas (1,4±0,3/35,0±8,6% vs. 0,5±0,2/10,0±4,6%; P<0,05). Foi verificado que o tratamento com ou sem E2 não interferiu no número e na taxa de recuperação de oócitos (1,3±0,4/29,8±9,0% vs. 0,7±0,2/16,9±6,1%; P>0,05). Não foi verificada diferença no número de oócitos de búfalas ou de vacas recuperados (1,4±0,4 e 0,6±0,2; P>0,05). Observou-se também que houve tendência (P=0,07) de maior taxa de recuperação de oócitos de búfalas que de vacas (35,2±9,2% vs. 12,9±5,4%). Os dados são indicativos de que o transporte de oócitos pelo oviduto de búfalas e de vacas independe da espécie do oócito e não é influenciado pelo E2.

Animals , Cattle/classification , Buffaloes/classification , Oocytes/metabolism , Estradiol/pharmacology