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1.
Arq. bras. oftalmol ; 83(3): 190-195, May-June 2020. tab, graf
Article in English | LILACS | ID: biblio-1131595

ABSTRACT

ABSTRACT Purpose: To investigate periostin and collagen I expression during a scleral remodeling in myopic eyes and to determine their role in collagen remodeling of the myopic sclera. Methods: Fifty one-week-old guinea pigs were divided into the control and form-deprivation myopia (FDM) groups. The eyes of animals in the form-deprivation myopia group were covered for 2, 4, and 8 weeks, or were covered for 4 weeks and then uncovered for 2 weeks. The diopters and axial lengths in the eyes in each group of guinea pigs were measured. Immunohistochemistry and reverse transcription polymerase chain reaction were used to detect the relative protein and mRNA expressions of periostin and collagen I in the scleral tissues of guinea pig. Results: Before masking, guinea pigs in the control and form-deprivation myopia groups were hypermetropic and did not differ significantly (p>0.05). Hypermetropic refraction in the control group gradually decreased. In guinea pigs from the form-deprivation myopia group, the refractive power gradually changed from +2.14 ± 0.33 D to -7.22 ± 0.51 D, and the axial length gradually changed from 5.92 ± 0.37 mm to 8.05 ± 0.34 mm from before until the end of masking. Before covering, no significant difference was observed in the relative collagen I and periostin mRNA and protein expression levels in the sclera of the guinea pig control and form-deprivation myopia groups (p>0.05). The relative collagen I and periostin protein and mRNA expression levels in the sclera of guinea pigs in the form-deprivation myopia group at 2, 4, and 8 weeks, and after covering the eyes for 4 weeks followed by uncovering for 2 weeks, were significantly lower than those in the control group (p<0.05). The collagen I and periostin mRNA expression levels were positively correlated with protein expression levels in the sclera of guinea pigs (protein: r=0.936, p<0.05; mRNA: r=0.909, p<0.05). Conclusions: Periostin was expressed in the myopic sclera of guinea pigs, and changes in periostin and collagen I expression were highly consistent. Periostin and collagen I may be involved in the regulation of scleral remodeling in myopia.


RESUMO Objetivo: Investigar a expressão da periostina e do colágeno I durante o remodelamento escleral em olhos míopes e determinar seu papel na remodelação do colágeno da esclera miópica. Métodos: Cinquenta cobaias com uma semana de idade foram divididas em grupo controle e miopia de privação de forma. Os olhos dos animais no grupo de miopia de privação de forma foram cobertos por 2, 4 e 8 semanas, ou foram cobertos por 4 semanas e depois descobertas por 2 semanas. As dioptrias e comprimentos axiais dos olhos em cada grupo de cobaias foram medidos. A imunohistoquímica e a reação em cadeia da polimerase com transcrição reversa foram utilizadas para detectar as expressões relativas de proteína e mRNA de periostina e colágeno I em tecidos esclerais das cobaias. Resultados: Antes do mascaramento, as cobaias nos grupos controle e miopia de privação de forma eram hipermetrópicas e não diferiam significativamente (p>0,05). A refração hipermetrópica no grupo controle diminuiu gradualmente. Nas cobaias do grupo de miopia de privação de forma, a potência de refração mudou gradualmente de +2,14 ± 0,33 D para -7,22 ± 0,51 D e o comprimento axial mudou gradualmente de 5,92 ± 0,37 mm para 8,05 ± 0,34 mm desde antes até o final do mascaramento. Antes do mascaramento, nenhuma diferença significativa foi observada nos níveis de expressão de mRNA e proteína de colágeno I e periostina na esclera dos grupos controle e miopia de privação de forma (p>0,05). Os níveis relativos de expressão de colágeno I e proteína periostina e mRNA na esclera de cobaias no grupo de miopia de privação de forma em 2, 4 e 8 semanas, e após cobertura dos olhos por 4 semanas seguido de descoberta por 2 semanas, foram significativamente menores que aqueles no grupo controle (p<0,05). Os níveis de expressão de mRNA, colágeno I e proteína periostina foram positivamente correlacionados com os níveis de expressão de proteína na esclera das cobaias (proteína: r=0,936, p<0,05; mRNA: r=0,909, p<0,05). Conclusões: A periostina foi expressa na esclerótica míope de cobaias e as alterações na expressão de periostina e colágeno I foram altamente consistentes. A periostina e o colágeno I podem estar envolvidos na regulação do remodelamento escleral na miopia.


Subject(s)
Humans , Sclera , Myopia, Degenerative , RNA, Messenger , Collagen , Disease Models, Animal , Guinea Pigs
2.
Arq. bras. med. vet. zootec. (Online) ; 72(3): 744-748, May-June, 2020. ilus
Article in English | ID: biblio-1128947

ABSTRACT

Leishmaniasis is a parasitic disease of worldwide spread. It is caused by protozoa of the genus Leishmania and is transmitted to animals and humans through the bite of sand flies. In Brazil, leishmaniasis is one of the zoonoses of major importance and expansion. The objective of this work is to describe the clinical, pathological, immunohistochemical and molecular findings of cutaneous leishmaniasis by Leishmania enriettii in guinea pig (Cavia porcellus). Three animals had nodular and alopecia lesions on the muzzle, ears and ulcerated lesions on the distal extremities of the pelvic limbs. The males (2) also had diffuse thickening of the scrotal skin. Samples of the ulcerated cutaneous lesions were evaluated by cytology which were observed as amastigote forms of Leishmania. One of the animals was euthanized and necropsied. Histopathology showed abundant dermal infiltrate of macrophages, plasma cells, lymphocytes and multinucleated giant cells. Numerous macrophages contained parasitoid vacuoles with amastigote forms, evidenced by immunohistochemical examination. The molecular characterization based on the SSUrDNA gene identified the species as L. enrietti. The diagnosis of cutaneous leishmaniasis in these cases was based on pathological findings and confirmed by immunohistochemistry, PCR and sequencing.(AU)


A leishmaniose é uma doença parasitária de distribuição mundial. É causada por protozoários do gênero Leishmania e é transmitida para animais e seres humanos por meio da picada de flebotomíneos. No Brasil, a leishmaniose é uma das zoonoses de maior importância e expansão. O objetivo deste trabalho é descrever os achados clínicos, patológicos, imuno-histoquímicos e moleculares de leishmaniose cutânea por Leishmania enriettii em cobaia (Cavia porcellus). Três animais apresentavam lesões nodulares e alopécicas no focinho e orelhas, além de lesões ulceradas nas extremidades distais dos membros pélvicos. Nos machos (2), foi observado espessamento difuso da pele escrotal. Amostras das lesões cutâneas ulceradas foram avaliadas por citologia, nas quais foram observadas formas amastigotas de Leishmania. Um dos animais foi submetido à eutanásia e necropsiado. Na histopatologia, foi observado infiltrado dérmico abundante de macrófagos, plasmócitos, linfócitos e com células gigantes multinucleadas. Numerosos macrófagos continham vacúolos parasitóforos com formas amastigotas, evidenciados por meio do exame de imuno-histoquímica. A caracterização molecular baseada no gene de SSUrDNA identificou a espécie como L. enrietti. O diagnóstico de leishmaniose cutânea nesses casos foi baseado nos achados patológicos e confirmado pelas técnicas de imuno-histoquímica, PCR e sequenciamento.(AU)


Subject(s)
Animals , Guinea Pigs , Leishmaniasis, Cutaneous/veterinary , Leishmania enriettii/isolation & purification , Guinea Pigs/microbiology , Immunohistochemistry/veterinary , Zoonoses , Polymerase Chain Reaction/veterinary , Alopecia
3.
Bol. latinoam. Caribe plantas med. aromát ; 19(3): 314-320, mayo 2020. ilus
Article in English | LILACS | ID: biblio-1116301

ABSTRACT

In order to evaluate the potential of this formulation (P. lentiscus L. oil-based ointment) to heal wounds, experimental wounds were done on guinea pigs and efficiency was comparatively assessed against a reference ointment, Cicaderma®. Wound contraction was performed on days 5, 10 and 15. Tissue sections were also evaluated histopathological on days 7, 14 and 21. Results showed that for all days (5, 10 and 15), the highest wound contraction values were attained for the P. lentiscus oil-based ointment treated group with wound contraction values of 19.38, 55.8 and 77.11%, respectively, as compared to the reference drug Cicaderma® where contractions were 7.97%, 49.53% and 71.44%, respectively. Vehicle and negative control groups however showed no statistically significant wound healing activity on the excision wound model. These experimental studies revealed that the P. lentiscus oil-based ointment displays remarkable wound healing activity, in accordance with its use in traditional medicine.


Con el fin de evaluar el potencial de esta formulación (ungüento a base de aceite de P. lentiscus L.) para curar heridas, se realizaron heridas experimentales en cobayos y se evaluó comparativamente su eficacia respecto de un ungüento de referencia, Cicaderma®. La contracción de la herida se realizó los días 5, 10 y 15. Las secciones de tejido también se evaluaron histopatológicamente los días 7, 14 y 21. Los resultados mostraron que para todos los días (5, 10 y 15), se obtuvieron los valores más altos de contracción de la herida para el grupo tratado con ungüento a base de aceite de P. lentiscus con valores de contracción de la herida de 19.38, 55.8 y 77.11%, respectivamente, en comparación con el medicamento de referencia Cicaderma® en donde las contracciones fueron 7.97%, 49.53% y 71.44%, respectivamente. Sin embargo, los grupos de control de vehículo y negativo no mostraron actividad de curación de heridas estadísticamente significativa en el modelo de herida por escisión. Estos estudios experimentales revelaron que la pomada a base de aceite de P. lentiscus muestra una notable actividad de curación de heridas, de acuerdo con su uso en la medicina tradicional.


Subject(s)
Animals , Male , Guinea Pigs , Ointments/pharmacology , Wound Healing/drug effects , Plant Oils/pharmacology , Pistacia/chemistry , Seeds
4.
Braz. j. otorhinolaryngol. (Impr.) ; 86(2): 222-227, March-Apr. 2020. graf
Article in English | LILACS | ID: biblio-1132576

ABSTRACT

Abstract Introduction: The use of electron microscopy in the study of the inner ear has allowed us to observe minute details of the hair cells, especially in ototoxicity studies; however, the preparation of this material is a difficult and delicate task. In an attempt to simplify the handling of these materials, two agents, toluidine blue and ethylenediamine tetra-acetic acid were tested, in addition to the elimination of osmium tetroxide during the preparation of albino guinea pig cochleae. We also tested the applicability of these methodologies in an ototoxicity protocol. Objective: To verify the quality of the images obtained with and without the use of ethylenediamine tetra-acetic acid, toluidine blue and osmium tetroxide in the preparation of cochleae of albino guinea pigs for the scanning electron microscopy. Methods: Three groups of cochleae were used. In Group 1, 10 cochleae were prepared with the usual methodology, dissecting the optical capsule without decalcification and using osmium tetroxide as a post-fixative agent. In Group 2, we prepared 10 cochleae decalcified with ethylenediamine tetra-acetic acid, injecting toluidine blue in the endolymphatic space to facilitate the identification of the organ of Corti. In Group 3, we used 4 cochleae of guinea pigs that received 3 doses of cisplatin (7.5 mg/kg, D1-D5-D6), two prepared according to the methodology used in Group 1 and two with that used in Group 2. Scanning electron microscopy images were obtained from the organ of Corti region of the basal turn of each cochlea. Results: The organ of Corti was more easily identified with the use of toluidine blue. The dissection of the cochlea was more accurate in the decalcified cochleae. The quality of the images and the preservation of the organ of Corti obtained with the two methodologies were similar. Conclusion: The proposed modifications resulted in images of similar quality as those observed using the traditional methodology.


Resumo Introdução: O emprego da microscopia eletrônica no estudo da orelha interna permitiu observar detalhes minuciosos das células ciliadas especialmente em estudos de ototoxicidade. Entretanto, o preparo desse material é trabalhoso e delicado. Para simplificar a manipulação desses materiais, testou-se o uso de dois agentes, azul de toluidina e ácido etilenodiamino tetra-acético, além da retirada do tetróxido de ósmio na preparação de cócleas de cobaias albinas. Testamos também a aplicabilidade dessas metodologias em um protocolo de ototoxicidade. Objetivo: Verificar a qualidade das imagens obtidas com e sem o uso de ácido etilenodiamino tetra-acético, azul de toluidina e tetróxido de ósmio na preparação de cócleas de cobaias albinas para a microscopia eletrônica de varredura. Método: Foram utilizados três grupos de cócleas. No Grupo 1 preparou-se 10 cócleas com a metodologia usual, dissecando a cápsula ótica sem descalcificac¸ão e utilizando tetróxido de ósmio como pós-fixador. No Grupo 2 preparamos 10 cócleas descalcificadas com ácido etilenodiamino tetra-acético, injetando azul de toluidina no espac¸o endolinfático para facilitar a identificação do órgão de Corti. No Grupo 3 utilizamos 4 cócleas de cobaias que receberam 3 doses de cisplatina (7,5 mg/kg, D1-D5-D6), duas preparadas com a metodologia do Grupo 1 e duas com a do Grupo 2. Foram obtidas imagens da microscopia eletrônica de varredura da região do órgão de Corti do giro basal de cada cóclea. Resultados: O órgão de Corti foi mais facilmente identificado com o azul de touidina. A dissecção da cóclea foi mais precisa nas cócleas descalcificadas A qualidade das imagens e a preservac¸ão do órgão de Corti obtidas com as duas metodologias foi similar. Conclusão: As modificações propostas resultaram em imagens de qualidade similar as observadas com o uso da metodologia tradicional.


Subject(s)
Animals , Female , Cisplatin/toxicity , Cochlea/drug effects , Cochlea/ultrastructure , Organ of Corti/drug effects , Organ of Corti/ultrastructure , Osmium Tetroxide/administration & dosage , Tolonium Chloride/administration & dosage , Microscopy, Electron, Scanning , Edetic Acid/administration & dosage , Guinea Pigs , Hair Cells, Auditory/drug effects , Hair Cells, Auditory/ultrastructure
5.
Braz. j. biol ; 80(1): 87-96, Feb. 2020. tab
Article in English | LILACS | ID: biblio-1089291

ABSTRACT

Abstract Asthma is an inflammatory disease of the lungs, and it causes oxidative stress. Lavandula dentata is an aromatic herb with anti-oxidative and anti-inflammatory activities. This study examined the activity of L. dentata extract on a guinea pig model of asthma. Adult males were divided into five groups: First group was control, second was asthma model induced by OVA, third was treated with L. dentata extract orally (300 mg/kg) for 21 days; the fourth was an asthma model with L. dentata extract (300 mg/kg) and fifth was treated with Tween 80 for 21 days. OVA treatment increased IgE, triglycerides, total cholesterol, glucose levels in serum, WBC count in blood and MDA in lungs. Also, OVA reduced SOD activity, GSH content in lungs, and GGT activity in serum (p<0.05). L. dentata extract treatment in asthma model reduced elevated IgE, triglycerides, total cholesterol, glucose levels in serum, and MDA in lungs (p<0.05), while it increased GSH content in lungs (p<0.05). These results suggest the possibility that L . dentata extract can exert suppressive effects on asthma, and may provide evidence that it is a useful agent for the treatment of allergic airway disease, it also limits oxidative stress induced by OVA. L. dentata extract appears to have hypolipidemic and hypoglycemic activities.


Resumo A asma é uma doença inflamatória dos pulmões e causa estresse oxidativo. Lavandula dentata é uma erva aromática com atividades anti-oxidantes e antiinflamatórias. Este estudo examinou a atividade do extrato de L. dentata em um modelo de asma de cobaia. Os machos adultos foram divididos em cinco grupos: o primeiro grupo foi controle, o segundo modelo foi o da asma induzido pela OVA, o terceiro foi tratado com extrato de L. dentata por via oral (300 mg / kg) por 21 dias; o quarto foi um modelo de asma com extrato de L. dentata (300 mg / kg) e o quinto foi tratado com Tween 80 por 21 dias. O tratamento com OVA aumentou a IgE, os triglicerídeos, o colesterol total, os níveis de glicose no soro, a contagem de leucócitos no sangue e o MDA nos pulmões. Além disso, o OVA reduziu a atividade da SOD, o conteúdo de GSH nos pulmões e a atividade da GGT no soro (p <0,05). O tratamento com extrato de L. dentata no modelo de asma reduziu a IgE elevada, triglicérides, colesterol total, níveis séricos de glicose e MDA nos pulmões (p <0,05), enquanto aumentou o conteúdo de GSH nos pulmões (p <0,05). Estes resultados sugerem a possibilidade do extrato de L. dentata poder exercer efeitos supressores sobre a asma, e pode fornecer evidências de que é um agente útil para o tratamento de doenças alérgicas das vias aéreas, além de limitar o estresse oxidativo induzido pela OVA. O extrato de L. dentata parece ter atividades hipolipemiantes e hipoglicêmicas.


Subject(s)
Animals , Male , Asthma , Lavandula , Bronchoalveolar Lavage Fluid , Plant Extracts , Ovalbumin , Disease Models, Animal , Guinea Pigs
6.
Article in English | WPRIM | ID: wpr-782293

ABSTRACT

0.05). Dogs inoculated with the former vaccine developed a significantly higher immune titer than non-vaccinated dogs.CONCLUSION: The Cabopol-adjuvanted, inactivated CAV-2 vaccine was safe and induced a high VNA titer in dogs.


Subject(s)
Adenoviruses, Canine , Amino Acids , Animals , Dogs , Enzyme-Linked Immunosorbent Assay , Formaldehyde , Guinea Pigs , Madin Darby Canine Kidney Cells , Urea , Vaccines
8.
Rev. bras. parasitol. vet ; 29(1): e014319, 2020. tab, graf
Article in English | LILACS | ID: biblio-1058013

ABSTRACT

Abstract The role of rodents as reservoirs of helminths of public health importance is not well known. The zoonotic potential of Syphacia spp. has been confirmed; therefore, the study aimed to estimate the occurrence of oxyurid nematodes in small rodents from pet shops and breeding clubs in Slovakia. Fecal samples of 586 pet rodents kept in 133 cages were collected between 2016 and 2018 and examined by Faust´s flotation method. Four species of oxyurid nematodes, Syphacia muris, S. obvelata, Aspiculuris tetraptera and Paraspidodera uncinata were detected. A. tetraptera was found in the faecal samples of all rodent species included in this survey. The number of positive boxes varied from 5.4% in hamsters to 70.0% with mice. The prevalence of Syphacia muris was highest in Mongolian gerbils where up to 75.0% boxes were positive; S. obvelata was found in 26.7% of boxes with mice, 25.0% of boxes with Mongolian gerbils and 3.2% of boxes with rats. The high prevalence of Syphacia spp. in all animal species points out the infection risk for humans. Animals offered for sale are often in close contact with human beings; therefore they should be regularly tested for parasites and then effectively dewormed.


Resumo O papel dos roedores como reservatórios de helmintos de importância para a saúde pública não é bem conhecido. O potencial zoonótico de Syphacia spp. foi confirmado; portanto, o estudo teve como objetivo estimar a ocorrência de nematóides oxiurídeos em pequenos roedores de pet shops e clubes de reprodução na Eslováquia. Amostras fecais de 586 roedores mantidos em 133 gaiolas foram coletadas entre 2016 e 2018 e examinadas pelo método de flotação de Faust. Foram detectadas quatro espécies de nematódeos oxiurídeos, Syphacia muris, S. obvelata, Aspiculuris tetraptera e Paraspidodera uncinata, A. tetraptera foi encontrado nas amostras fecais de todas as espécies de roedores incluídas nesta pesquisa. O número de gaiolas positivas variou de 5,4% em hamsters a 70,0% em camundongos. A prevalência de Syphacia muris foi maior nos gerbilos da Mongólia, onde até 75,0% das gaiolas foram positivas; S. obvelata foi encontrada em 26,7% das gaiolas com camundongos, 25,0% das gaiolas com gerbilos da Mongólia e 3,2% das gaiolas com ratos. A alta prevalência de Syphacia spp. em todas as espécies animais aponta o risco de infecção para os seres humanos. Animais oferecidos para venda estão frequentemente em contato próximo com seres humanos; portanto, eles devem ser regularmente testados quanto a parasitas e, então, efetivamente desparasitados.


Subject(s)
Animals , Oxyuriasis/veterinary , Oxyuroidea/isolation & purification , Rodent Diseases/parasitology , Feces/parasitology , Pets/parasitology , Neglected Diseases/veterinary , Oxyuriasis/diagnosis , Oxyuriasis/epidemiology , Oxyuroidea/classification , Rats/parasitology , Rodent Diseases/diagnosis , Rodent Diseases/epidemiology , Prevalence , Gerbillinae/parasitology , Cricetinae/parasitology , Slovakia/epidemiology , Pets/classification , Neglected Diseases/diagnosis , Neglected Diseases/epidemiology , Guinea Pigs/parasitology , Mice/parasitology
9.
Braz. arch. biol. technol ; 63: e20190260, 2020. graf
Article in English | LILACS | ID: biblio-1132251

ABSTRACT

Abstract Creating experimental models for obtaining stem cells from adipose tissue is necessary to elucidate their peculiar features. Objective: This study proposed a reliable reproducible and consistent experimental model for obtaining mesenchymal stem cells from adipose tissue. Material and Method: Lines of New Zealand rabbits, Wistar rats and CaviaPorcellus guinea pigs (4 animals per species) were used. Fatty tissue mesenchymal stem cells were removed from dorsal, epididymal and inguinal regions. Percentage viable cells and percentage cells expanded and submitted to chondrogenic differentiation were compared by animal species and collection site. Results: Chondrogenic differentiation occurred in a similar manner across all samples, independently of animal species or collection site. Among samples assessed, the inguinal region of rats yielded the highest percentage of viable and expanded cells. Conclusion: A reliable, reproducible and consistent model for obtaining mesenchymal stem cells was produced. Of the several variables analysed, the best results were obtained from the inguinal region of the rat.


Subject(s)
Animals , Guinea Pigs , Rats , Adipose Tissue/cytology , Mesenchymal Stem Cells/cytology , Rats, Wistar , Models, Animal
10.
Article in English | WPRIM | ID: wpr-827259

ABSTRACT

BACKGROUND@#We previously demonstrated that continuous exposure to nitrous acid gas (HONO) for 4 weeks, at a concentration of 3.6 parts per million (ppm), induced pulmonary emphysema-like alterations in guinea pigs. In addition, we found that HONO affected asthma symptoms, based on the measurement of respiratory function in rats exposed to 5.8 ppm HONO. This study aimed to investigate the dose-response effects of HONO exposure on the histopathological alterations in the respiratory tract of guinea pigs to determine the lowest observed adverse effect level (LOAEL) of HONO.@*METHODS@#We continuously exposed male Hartley guinea pigs (n = 5) to four different concentrations of HONO (0.0, 0.1, 0.4, and 1.7 ppm) for 4 weeks (24 h/day). We performed histopathological analysis by observing lung tissue samples. We examined samples from three guinea pigs in each group under a light microscope and measured the alveolar mean linear intercept (Lm) and the thickness of the bronchial smooth muscle layer. We further examined samples from two guinea pigs in each group under a scanning electron microscope (SEM) and a transmission electron microscope (TEM).@*RESULTS@#We observed the following dose-dependent changes: pulmonary emphysema-like alterations in the centriacinar regions of alveolar ducts, significant increase in Lm in the 1.7 ppm HONO-exposure group, tendency for hyperplasia and pseudostratification of bronchial epithelial cells, and extension of the bronchial epithelial cells and smooth muscle cells in the alveolar duct regions.@*CONCLUSIONS@#These histopathological findings suggest that the LOAEL of HONO is < 0.1 ppm.


Subject(s)
Alveolar Epithelial Cells , Animals , Bronchi , Dose-Response Relationship, Drug , Emphysema , Epithelial Cells , Guinea Pigs , Hyperplasia , Inhalation Exposure , Lung , Pathology , Male , Microscopy, Electron, Scanning , Microscopy, Electron, Transmission , Myocytes, Smooth Muscle , Nitrous Acid , Toxicity
11.
Rev. MVZ Córdoba ; 24(3): 7286-7290, sep.-dic. 2019. tab
Article in Spanish | LILACS | ID: biblio-1115252

ABSTRACT

RESUMEN Objetivo. Evaluar el consumo, la digestibilidad y el crecimiento de cuyes alimentados con dos alimentos (A y K) formulados para esta especie y un alimento para conejos en crecimiento con suplementación de vitamina C (AC+VC). Materiales y métodos. Dieciocho cuyes (Cavia porcellus) de 248±38 g de peso vivo inicial se distribuyeron en un diseño completamente al azar con un arreglo factorial 3 × 2 (tipo de alimento y género). La ingesta de alimento, fibra detergente neutro, el aumento de peso, la conversión alimenticia, y los cambios en las variables morfométricas se midieron diariamente, mientras que la digestibilidad de la MS y FDN se determinaron al final del periodo. Resultados. No hubo diferencias en el consumo de MS (p=0.88); sin embargo, la digestibilidad de la MS fue mayor (p<0.01) en los alimentos para cuyes e inferior en AC+VC. El consumo y digestibilidad de FDN fueron mayores en AC+VC (p<0.01). La ganancia diaria fue similar entre los tratamientos (p>0.05). No hubo diferencias (p>0.01) en las variables morfométricas entre los alimentos, pero los machos fueron más grandes que las hembras (p<0.01). Conclusiones. Los cuyes pueden ser alimentados con alimento de conejo suplementado con vitamina C.


ABSTRACT Objective. An experiment was conducted to evaluate the feed intake, digestibility and growth of pigs fed with two feeds (A and K) specially formulated for this species and a commercial feed for growing rabbits with supplementation of vitamin C (RF+VC). Materials and methods. Eighteen Guinea pigs of 248±38 g initial body weight were distributed in a completely randomized design with factorial arrangement 3×2 (dietary treatments and sex). Feed and neutral detergent fiber intake, weight gain, feed/gain, and morphometric variables were measured individually for 30 days. Dry matter and neutral detergent fiber digestibility were measured during the last seven days of the experiment. Results. There were no differences on feed intake (p=0.88); however, the dry matter digestibility was higher (p<0.01) in feeds formulated for Guinea pigs (A and K) and lower in the rabbit feed plus vitamin C. The intake and digestibility of NDF were higher in the RF+VC and lower in feeds for Guinea pigs (p< 0.01). The average daily gain was similar among the treatments (p>0.05). There were no differences (p>0.01) in the morphometric variables among dietary treatments, but there were sex differences as the males were bigger than the females (p<0.01). Conclusions. The results indicate that Guinea pigs can be fed with rabbit feed supplemented with vitamin C.


Subject(s)
Animals , Guinea Pigs , Ascorbic Acid , Guinea Pigs , Animal Feed
13.
Int. arch. otorhinolaryngol. (Impr.) ; 23(3): 267-275, July-Sept. 2019. tab, graf
Article in English | LILACS | ID: biblio-1040018

ABSTRACT

Abstract Introduction Riluzole (2-amino-6-trifluoromethoxy benzothiazole) is known as a neuroprotective, antioxidant, antiapoptotic agent. It may have beneficial effects on neuronal cell death due to cisplatin-induced ototoxicity. Objective To evaluate the effect of riluzole on cisplatin-induced ototoxicity in guinea pigs. Methods Twenty-four guinea pigs, studied in three groups, underwent auditory brainstem response evaluation using click and 8 kHz tone burst stimuli. Subsequently, 5 mg/kg of cisplatin were administered to all animals for 3 days intraperitoneally (i.p.) to induce ototoxicity. Half an hour prior to cisplatin, groups 1, 2 and 3 received 2 ml of saline i.p., 6 mg/kg of riluzole hydrochloride i.p., and 8 mg/kg of riluzole hydrochloride i.p., respectively, for 3 days. The auditory brainstem responses were repeated 24 hours after the last drug administration. The cochleae were analyzed by transmission electron microscopy (TEM). Results After drug administiration, for 8,000 Hz stimulus, group 1 had significantly higher threshold shifts when compared with groups 2 (p < 0.05) and 3 (p < 0.05), and there was no significant difference in threshold shifts between groups 2 and 3 (p > 0.05). Transmission electron microscopy findings demonstrated the protective effect of riluzole on the hair cells and the stria vascularis, especially in the group treated with 8 mg/kg of riluzole hydrochloride. Conclusion We can say that riluzolemay have a protective effect on cisplatin- induced ototoxicity. However, additional studies are needed to confirm these results and the mechanisms of action of riluzole.


Subject(s)
Animals , Male , Evoked Potentials, Auditory, Brain Stem/drug effects , Cisplatin/adverse effects , Riluzole/pharmacology , Hearing Loss, Sensorineural/chemically induced , Auditory Threshold/drug effects , Stria Vascularis/drug effects , Stria Vascularis/pathology , Cochlear Nerve/drug effects , Cochlear Nerve/pathology , Riluzole/therapeutic use , Models, Animal , Microscopy, Electron, Transmission , Guinea Pigs , Hair Cells, Auditory/drug effects , Hair Cells, Auditory/pathology , Nerve Degeneration/chemically induced
14.
Article in Spanish | LILACS | ID: biblio-1020661

ABSTRACT

RESUMEN: Objetivo: de este estudio fue determinar la efectividad de dos biomateriales, el plasma rico en fibrina (PRF) y la membrana de colágeno en la regeneración ósea guiada. Materiales y método: Fueron utilizados 30 cobayos adultos machos entre 900 a 1100 g. divididos en tres grupos de 10 cobayos cada uno (Grupo A: Control, grupo B: Membrana de colágeno y grupo C: Plasma rico en fibrina). A cada grupo se le creó un defecto óseo mandibular unilateral de 2mm. Al grupo A no se colocó un biomaterial, en los grupos B y C sí se colocaron los biomateriales en los defectos óseos. A los 15 y 30 días de cicatrización se realizaron cortes histológicos para evaluar la cantidad de fibroblastos, osteocitos y osteoblastos. Resultados: A los 15 días el grupo C formó 40,6 ± 8,08 osteocitos/camp y el grupo B 27,6 ± 4,72 (p<0.05); a los 30 días el grupo C: 30,6 ± 11,55 y el grupo B: 23,6 ±3,85 (p>0.05). Conclusión: El PRF induce una mayor proliferación celular de forma significativa que los otros grupos en los primeros días de cicatrización; a los 30 días la proliferación es similar con el grupo de membrana de colágeno sin existir diferencias significativas.


ABSTRACT: Aim: of this study was to determine the effectiveness of two biomaterials, fibrin-rich plasma (PRF) and collagen membrane in guided bone regeneration. Materials and method: Thirty male guinea pigs were used, weighing between 900 and 1100 g., divided into three groups of 10 guinea pigs each (Group A: control, group B: collagen membrane and group C: fibrin-rich plasma). Each group had a 2-mm unilateral mandibular bone defect. Group A did not receive any biomaterial; in groups B and C the biomaterials were used in the bone defects. After 15 and 30 days of healing, histological sections were performed to evaluate the amount of fibroblasts, osteocytes and osteoblasts. Results: After 15 days, group C formed 40.6 ± 8.08 osteocytes / camp and group B 27.6 ± 4.72 (p <0.05); After 30 days, group C: 30.6 ± 11.55 and group B: 23.6 ± 3.85 (p> 0.05). Conclusion: During the first 15 days of healing, PRF induces a greater cellular proliferation than the other groups in a significant way; after 30 days, the proliferation is similar to the collagen membrane group without significant differences.


Subject(s)
Guinea Pigs , Bone Regeneration , Fibrin , Collagen , Epidemiology, Experimental
15.
Pesqui. vet. bras ; 39(7): 549-560, July 2019. tab, ilus
Article in English | ID: biblio-1040708

ABSTRACT

Guinea pigs are animal models widely used in research related to developmental biology. The objective of this work was to demonstrate the process of formation and differentiation of urinary organs in females of the species in the prenatal period. Four females were used at 25, 30, 45 and >65 DG (days of gestation). The animals were dissected, and then macroscopic and microscopic descriptions of the urinary organs were performed. At 25 DG metanephros were present in the urogenital crest into the abdominal cavity. Collecting ducts and glomerular precursor cells could be visualized. After this period, metanephros underwent microstructural modifications to form the kidneys at the end of the prenatal period. After 30 DG, the renal parenchyma already had a cortex, where the glomerulus and proximal convoluted tubules were present; and the medulla, where distal convoluted tubules, collecting ducts, and pelvis were present. The pelvis of each kidney was drained by the ureters. The ureters also underwent tissue differentiation to be differentiated (mucosa with transitional epithelium and lamina propria of connective tissue, muscular, and adventitia) at the end of the prenatal period. The urinary vesicle also underwent tissue changes to form the tunics similar to those found in the ureters, with emphasis on the greater volume of the muscular tunica and the lamina propria that constituted the submucosa in this organ. The pelvic urethra was evidenced by a mucosa lined by transitional epithelium, submucosa, muscular and adventitia. Finally, a partial clitoral urethra and a urethral meatus in the prepuce of the clitoris were also evidenced. The urethral channel began to form with the emergence of the urethral plate and the urethral groove at 30 DG and thereafter with the fusion of the urethral folds to form a partially channeled urethra in the clitoris. A urethral meatus was observed in the most distal portion of the clitoral tissue, formed by the fusion of the prepuce. It is concluded that the urinary organs of guinea pig have similar development to that described in domestic animals, except for the partial clitoral urethra and evident urethral meatus.(AU)


Os porquinhos-da-índia são modelos animais amplamente utilizados em pesquisas relacionadas a biologia do desenvolvimento. O objetivo deste trabalho foi demonstrar o processo de formação e diferenciação dos órgãos urinários em fêmeas da espécie no período pré-natal. Foram utilizadas quatro fêmeas aos 25, 30, 45 e >65 DG (dias de gestação). Os animais foram dissecados e então, realizaram-se descrições macroscópicas e microscópicas dos órgãos urinários. Aos 25 DG os metanefros estavam presentes na crista urogenital da cavidade abdominal. Podiam ser visualizados ductos coletores e células precursoras glomerulares. Após este período, os metanefros sofreram modificações microestruturais para formar os rins ao final do período pré-natal. Após os 30 DG, o parênquima renal já apresentava um córtex, onde estavam presentes os glomérulos e túbulos convolutos proximais, e a medula onde estavam presentes túbulos convolutos distais, ductos coletores e a pelve. A pelve de cada rim era drenada pelos ureteres. Os ureteres também sofreram diferenciação tecidual para estarem com suas túnicas diferenciadas (mucosa com epitélio de transição e lâmina própria de tecido conjuntivo; muscular; e, adventícia) ao final do período pré-natal. A vesícula urinária também passou por modificações teciduais para formar as túnicas semelhantes as dos ureteres, com destaque para o maior volume da túnica muscular e a lâmina própria que constituiu a submucosa neste órgão. Uma uretra pélvica foi evidenciada por uma mucosa revestida por epitélio de transição, submucosa, muscular e adventícia. Por último, uma uretra parcialmente clitoriana e um meato uretral no prepúcio do clitóris também foi evidenciado. O canal uretral começou a se formar com o aparecimento da placa uretral e do sulco uretral aos 30 DG e posteriormente com a fusão das pregas uretrais para formar uma uretra parcialmente canalizada no clitóris. Observou-se um meato uretral na porção mais distal do tecido clitoriano, formado pela fusão do prepúcio. Conclui-se que os órgãos urinários do porquinho-da-índia possuem desenvolvimento semelhante ao descrito em animais domésticos, com exceção da uretra parcialmente clitoriana e do meato uretral evidente.(AU)


Subject(s)
Animals , Female , Sex Differentiation , Urethra/growth & development , Urinary Tract/growth & development , Guinea Pigs/anatomy & histology , Guinea Pigs/growth & development
16.
Int. j. morphol ; 37(2): 416-422, June 2019. tab, graf
Article in English | LILACS | ID: biblio-1002237

ABSTRACT

To contribute knowledge of an important experimental model for studies on skin embryology, a study was carried out to describe the morphological events of the skin during the intrauterine life of Cavia porcellus from the 10th to the 60th day of gestation. Embryos and fetuses were dissected, and the skin of the nasal, cranial, lumbar and anal regions was processed byoptical microscopy. At 30 days the first hairs, called lanugos, were observed in the cranial region. The morphological description showed that a few days can make a great difference in development.


Con el objetivo de contribuir al conocimiento de un importante modelo experimental para estudios sobre embriología de la piel, se llevó a cabo un estudio para describir los eventos morfológicos de la piel durante la vida intrauterina de Cavia porcellus desde el día 10 hasta el día 60 de gestación. Los embriones y los fetos se disecaron y se procesó la piel de las regiones nasal, craneal, lumbar y anal, mediante microscopía óptica. A los 30 días se observaron los primeros vellos, llamados lanugos, en la región craneal. La descripción morfológica mostró que unos pocos días pueden marcar una gran diferencia en el desarrollo.


Subject(s)
Animals , Male , Pregnancy , Skin/embryology , Models, Animal , Guinea Pigs , Skin/growth & development , Skin/ultrastructure , Time Factors
17.
J. oral res. (Impresa) ; 8(2): 152-158, abr. 30, 2019. tab, ilus
Article in English | LILACS | ID: biblio-1145329

ABSTRACT

Objective: To evaluate the effects of administering diclofenac and ketoprofen, as well as the effects of environmental oxygen pressure variation on mandibular bone regeneration. Methods: Thirty-six guinea pigs were distributed into two equal groups. Mandibular bone defects were performed on both groups. Group A was monitored under oxygen pressure at altitude (3320msl, 107mm Hg). Group B was monitored at sea level oxygen pressure (150msl, 157mm Hg). Each group was subdivided into 3 equal groups (A1, A2, A3 and B1, B2, B3). Subgroups A1 and B1 were given diclofenac; subgroups A2 and B2 ketoprofen; subgroups A3 and B3 NaCl. Bone regeneration was evaluated histologically on days 15 and 30. Results: After 15 days in the group controlled at sea level, the level of osteoblasts presented by the control subgroup was significantly higher (28.00±2.65) compared to the diclofenac subgroup (16.00±6.25) and to the ketoprofen subgroup (18.00±4.36); (p=0.041). After 15 days in the group controlled at altitude, the level of osteoblasts was significantly higher in the control subgroup (38.00±5.29) compared to the diclofenac subgroup (21.67±6.35) and to the ketoprofen subgroup (19.33±2.52); p=0.007. After 30 days in the group at sea level there was no difference found in the cell counting; p>0.05. After 30 days in the group controlled at altitude, the level of osteoblast was significantly higher in the control subgroup (58.00±4.58) compared to the diclofenac subgroup (34.33±4.73) and the ketoprofen subgroup (34.00±11.14); (p=0.003). Conclusion: The administration of diclofenac and ketoprofen produced lower mandibular bone regeneration, the effect being significantly more negative at sea level.


Objetivo: Evaluar el efecto de la administración de diclofenaco y ketoprofeno y de la variación de la presión de oxígeno ambiental sobre la regeneración ósea mandibular. Métodos: Participaron 36 cobayos distribuidos en dos grupos iguales. A ambos grupos se les realizaron defectos óseos mandibulares. El Grupo A fue controlado bajo presión de oxígeno en altura (3320msnm, 107mm Hg). El Grupo B fue controlado bajo presión de oxígeno a nivel del mar (150msnm, 157mm Hg). Cada grupo fue dividido en 3 subgrupos iguales (A1, A2, A3 y B1, B2, B3). Los subgrupos A1 y B1 recibieron diclofenaco; A2 y B2, ketoprofeno; A3 y B3, NaCl. La regeneración ósea fue evaluada histológicamente a los 15 y 30 días. Resultados: A nivel del mar, a los 15 días, hubo una significativa mayor cantidad de osteoblastos en el subgrupo control (28,00±2,65) comparado con el subgrupo diclofenaco (16,00±6.25) y ketoprofeno (18,00±4.36); (p=0,041). En altura, a los 15 días, hubo una significativa mayor cantidad de osteblastos en el subgrupo control (38,00±5,29) comparado con el subgrupo diclofenaco (21,67±6,35) y ketoprofeno (19,33±2,52); p=0,007. A nivel del mar, a los 30 días, no se encontró diferencia en el conteo celular; p>0,05. En altura, a los 30 días, se encontró una significativa mayor cantidad de osteoblastos en el subgrupo control (58,00±4,58) comparado con el subgrupo diclofenaco (34,33±4,73) y ketoprofeno (34,00±11,14); (p=0,003). Conclusión: La administración de diclofenaco y ketoprofeno produjeron una menor regeneración ósea mandibular, siendo este efecto significativamente más negativo a nivel del mar.


Subject(s)
Animals , Guinea Pigs , Bone and Bones/drug effects , Bone Regeneration/drug effects , Anti-Inflammatory Agents, Non-Steroidal/pharmacology , Osteoblasts/drug effects , Atmospheric Pressure , Diclofenac/therapeutic use , Ketoprofen/therapeutic use , Epidemiology, Experimental , Hypoxia-Inducible Factor 1
18.
Rev. peru. med. integr ; 4(4): 110-115, 2019. graf
Article in Spanish | LILACS, MTYCI | ID: biblio-1145704

ABSTRACT

Objetivo. El objetivo de este estudio fue investigar el potencial efecto antiespasmódico de Rubus roseus y Mentha pulegium en íleon aislado de cobayo (Cavia porcellus) Materiales y Métodos. Los segmentos de íleon se precontrajeron con acetilcolina (ACh; 4 × 10−6 M) y cloruro de potasio (KCl; 4 × 10-4 M) luego se evaluó la respuesta de los decoctos de Rubus roseus (Rr) Mentha pulegium (Mp) en el baño de órganos aislado en concentraciones crecientes (no acumulativas), como controles positivos se utilizaron nifedipino 5 × 10-8 M (antagonista de canales de Ca2+ voltaje dependientes); atropina sulfato 5,5 × 10-9 M (antagonista muscarínico no selectivo), y N-butilbromuro de hioscina 3 x 10-3 M (antagonista muscarínico M3 selectivo). Se cuantificó la amplitud y la frecuencia de contracción (durante diez minutos) después de la administración de los decoctos. Resultados. Los decoctos de Rubus roseus y Mentha pulegium reducen las contracciones inducidas por acetilcolina (p < 0,001) y KCl (p < 0,01) similares a nifedipino (Mp: 4 y 8 mg/mL); atropina sulfato (Rr: 0,2-4 mg/mL; Mp: 0,8 y 1,6 mg/mL) y N-butilbromuro de hioscina (Mp: 2,4 y 8 mg/mL). Por otro lado, ambos decoctos reducen la frecuencia de contracción inducidas por Ach (p < 0,001) y KCl (p < 0,001). Conclusión. Los decoctos de Rubus roseus y Mentha pulegium tienen efecto antiespasmódico en íleon aislado de cobayo (Cavia porcellus).


Objective. This study aimed to investigate the potential antispasmodic effect of Rubus roseus and Mentha pulegium on isolated guinea pig (Cavia porcellus) ileum. Materials and Methods. The ileum segments were pre-contracted with acetylcholine (ACh, 4 × 10-6 M) and potassium chloride (KCl, 4 × 10-4 M) then the response of the Rubus roseus (Rr) and Mentha pulegium (Mp) decocts was evaluated in the organ bath isolated in increasing concentrations (non-cumulative), as positive controls were used nifedipine 5 × 10-8 M (antagonist of voltage dependent Ca2+ channels) atropine sulfate 5,5 × 10-9 M (non-selective muscarinic antagonist) and 3 x 10-3 M hyoscine N-butylbromide (selective M3 muscarinic antagonist). The amplitude and the frequency of contraction were quantified (during 10 minutes) after the administration of the decocts. Results. The decocts of Rubus roseus and Mentha pulegium decrease the contractions induced by acetylcholine (p < 0.001) and KCl (p <0.01) comparable to nifedipine (Mp: 4 and 8 mg/mL), atropine sulfate (Rr: 0.2 - 4 mg/mL, Mp: 0.8 and 1.6 mg/mL) and hyoscine N-butylbromide (Mp: 2.4 and 8 mg/mL). On the other hand, both decocts reduce the frequency of contraction induced by Ach (p <0.001) and KCl (p <0.001). Conclusions. The decocts of Rubus roseus and Mentha pulegium have an antispasmodic effect on isolated guinea pig ileum (Cavia porcellus).


Subject(s)
Animals , Parasympatholytics , Mentha pulegium , Rubus , Plants, Medicinal , Guinea Pigs , Ileum , Medicine, Traditional
19.
Article in Chinese | WPRIM | ID: wpr-774213

ABSTRACT

Zinc oxide quantum dots (ZnO QDs) were synthesized by gel-sol method and employed as the transdermal aloesin (Alo) carriers. ZnO QDs were surface-functionalized with amino using aminopropyltriethoxysilane (APTES). Alo was covalently bonded on the surface of ZnO QDs via N,N'-carbonyldiimidazole to obtain Alo NPs, which were characterized by transmission electron microscope (TEM), dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FTIR) and thermal gravimetric analyzer (TGA). TEM images showed that ZnO QDs were analogously sphere and monodisperse with a reasonably narrow size distribution, of which was around 4 nm. The size of Alo NPs increased to around 8 nm due to the surface modification. The intense bands at around 3 400 cm and 1 200 cm in the FTIR spectrum of Alo NPs from the vibration of -OH indicated the linkage of Alo on the surface of ZnO QDs. The results of TGA analysis showed that the mass ratio of ZnO QDs and Alo were 39.27% and 35.14%, respectively. The penetration of Alo NPs was much higher than raw Alo according to the passive penetration experiments with Franz-type diffusion cells instrument using full-thickness cavy skin, which manifested the improvement of the penetration for Alo delivered by ZnO QDs. The pH-controlled drug release behavior was investigated. At pH 7.4, only a small amount of Alo (1.45% ± 0.21%) had been released after 2 h. In contrast, as incubation at pH 5.0 of which pH was similar to endosomal environment, Alo was released very fast (87.63% ± 0.46% in 2 h) from Alo NPs, confirming that Alo NPs could response to the pH and realize the intracellular drug release. The inhibitory effect of Alo NPs on tyrosinase was in a dose dependent manner. When the concentration of Alo NPs was 12.5 μg/mL, the inhibition rate was up to 40.32% ± 1.57%. All the results show that the Alo NPs hold a great potential in transdermal tyrosinase inhibition.


Subject(s)
Administration, Cutaneous , Animals , Chromones , Drug Delivery Systems , Glucosides , Guinea Pigs , Monophenol Monooxygenase , Metabolism , Nanoparticles , Quantum Dots , Zinc Oxide
20.
Article in English | WPRIM | ID: wpr-764239

ABSTRACT

Canine adenovirus type 1 (CAV-1) infection results in hepatitis in dogs. In this study, we investigated the biologic and genetic characteristics of the CAV-1 vaccine strain (CAV1V) to improve quality control about CAV vaccine. The identity of CAV1V as CAV-1 was confirmed based on its cytopathic effects and the results of hemagglutination (HA) and immunofluorescence assays, and electron microscopy. The CAV1V strain reached 10(7.5) TCID(50)/mL in MDCK cells at 4 days post-inoculation and exhibited hemmagglutination activity of 256 U using guinea pig erythrocytes. Intranuclear fluorescence in the infected cells was observed and typical adenoviruses were observed in electon microscope. CAV1V strain was identified as a CAV-1 strain by nucleotide sequence analysis. In a comparison of the nucleotide sequences of the fiber genes of several CAV strains, CAV1V showed the highest similarity (99.8%) with the GLAXO strain, which was isolated in Canada. Our biological characterization of CAV1V will facilitate quality control of the canine hepatitis vaccine.


Subject(s)
Adenoviridae , Adenoviruses, Canine , Animals , Base Sequence , Canada , Dogs , Erythrocytes , Fluorescence , Fluorescent Antibody Technique , Guinea Pigs , Hemagglutination , Hepatitis , Madin Darby Canine Kidney Cells , Microscopy, Electron , Quality Control
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