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1.
Biol Res ; 36(2): 233-40, 2003.
Article in English | MEDLINE | ID: mdl-14513718

ABSTRACT

Angiogenesis, the development of new blood vessels from the existing vascular network, may result as a consequence of the increase or decrease of proangiogenic or antiangiogenic factors, respectively. The tumor itself could up-regulate the production of angiogenic factors. Recently, we established that the steroidal drug betamethasone in low concentration inhibit the neovascularization promoted by TA3 Ts on CAM of chick embryos. We describe here the effects of the non-steroidal drug ketoprofen, alone or in association with betamethasone, on the angiogenesis promoted by TA3 Ts on CAM. The main finding reported here is that the formation of new blood vessels is strongly inhibited by low concentrations of ketoprofen. The association of both drugs produced a synergistic effect, significantly decreasing tumoral supernatant angiogenesis. It is known that steroidal anti-inflammatory drugs inhibit the enzymes required for the production of prostaglandins through a nuclear GR mediated mechanism. This may operate as a general mechanism in endothelial cells as well. Considering that the induction of COX 1 and COX2 are inhibited by ketoprofen, and that these enzymes are located in the stromal compartment of the CAM, we propose that its antiangiogenic effect may occur via inhibition of the two COX isoforms. In fact, we found that ketoprofen induced apoptosis in both the stromal fibroblast and endothelial cells. The potentiated effect of the combination of betamethasone and ketoprofen may have some therapeutic projections in the control of pathological angiogenesis.


Subject(s)
Anti-Inflammatory Agents/pharmacology , Betamethasone/pharmacology , Ketoprofen/pharmacology , Neovascularization, Physiologic/drug effects , Animals , Anti-Inflammatory Agents, Non-Steroidal/pharmacology , Chick Embryo , Drug Synergism , Neoplasm Proteins , Neovascularization, Pathologic/etiology , Neovascularization, Pathologic/prevention & control , Tumor Cells, Cultured/drug effects
2.
Biol Res ; 35(3-4): 339-45, 2002.
Article in English | MEDLINE | ID: mdl-12462986

ABSTRACT

In this study, we showed the effect of the betamethasone, sulindac and quinacrine alone or combined, on the inflammatory angiogenesis promoted by polyurethane sponge on mice. The main finding reported here is that the formation of new blood vessels was strongly inhibited by low concentration of betamethasone, sulindac or quinacrine, whether alone or in combination. It is known that steroidal anti-inflammatory drugs inhibit the enzymes required for the production of prostaglandins through a nuclear glucocorticoid receptor (GR) mediated mechanism. This mechanism may occur in endothelial cells as well. Considering that activity of cyclo-oxigenases 1 and 2 is inhibited by sulindac, and that these enzymes are located in the stromal tissue, we propose that the anti-angiogenic effect of these agents may occur via inhibition of both COX isoforms. On the other hand, quinacrine inhibited PLA2 activity, and we propose here that the anti-angiogenic effect occurs via inhibition of the enzyme PLA2. The potentiated effect of the association of betamethasone, sulindac and quinacrine may have some therapeutic benefit in the control of pathological angiogenesis. Further studies are required to validate these propositions.


Subject(s)
Anti-Inflammatory Agents, Non-Steroidal/therapeutic use , Betamethasone/therapeutic use , Neovascularization, Pathologic/drug therapy , Quinacrine/therapeutic use , Sulindac/therapeutic use , Animals , Apoptosis/drug effects , Cyclooxygenase 1 , Cyclooxygenase 2 , Drug Therapy, Combination , Female , Isoenzymes/drug effects , Membrane Proteins , Mice , Neovascularization, Pathologic/chemically induced , Neovascularization, Pathologic/pathology , Polyurethanes , Prostaglandin-Endoperoxide Synthases/drug effects , Surgical Sponges
3.
Pathol Oncol Res ; 8(1): 47-53, 2002.
Article in English | MEDLINE | ID: mdl-11994763

ABSTRACT

Previous studies have reported that sulfated b b-cyclodextrin, a naturally occurring cycloamylose built up from six to eight glucopyranose units, when administered alone promotes angiogenesis, but administered with an angiostatic steroid inhibits angiogenesis in the cick embryo bioassay. In our experiments sulfated b b-cyclodextrin has been shown to possess many properties unrelated to its classical functions in the promotion and inhibition of angiogenesis that were not previously described. We studied the angiogenic and angiostatic properties of b b-cyclodextrin in a subcutaneous plastic sponge model in mice. We realized two set of experiments. In each set mice were randomized into five groups (n= 5 mice). The first group was treated with sulfated b b-cyclodextrin (200 ng), the second group was treated with sulfated b b-cyclodextrin (2000 ng), the third group received unsubstituted b b-cyclodextrin (2000 ng), the fourth group was treated with sulfated b b-cyclodextrin (20000 ng) and the last group was used as a control group. In all groups compounds were administered intraperitoneally 4 days after subcutaneous implantation of a sterile polyvinyl sponge on day 0, controls were not treated. Cyclodextrin administered alone at low drug concentration (200 ng) promoted angiogenesis and increased the development of venules in the sponge matrix. However, cyclodextrin administered at high drug concentration (2000 and 20 000 ng) reduced the vessel index in the sponge and areas of microhemorrhages were observed. From our results we propose that b b-cyclodextrin contains both a promoter and an inhibitor of angiogenesis and that the activation of both is drug concentration dependent.


Subject(s)
Angiogenesis Inducing Agents/pharmacology , Angiogenesis Inhibitors/pharmacology , Cyclodextrins/pharmacology , Neovascularization, Pathologic/drug therapy , beta-Cyclodextrins , Analysis of Variance , Angiogenesis Inducing Agents/administration & dosage , Angiogenesis Inhibitors/administration & dosage , Animals , Apoptosis/drug effects , Cyclodextrins/administration & dosage , Mice , Surgical Sponges , Tumor Cells, Cultured
4.
Biol. Res ; 35(3/4): 339-345, 2002. ilus, tab, graf
Article in English | LILACS | ID: lil-339727

ABSTRACT

In this study, we showed the effect of the betamethasone, sulindac and quinacrine alone or combined, on the inflammatory angiogenesis promoted by polyurethane sponge on mice. The main finding reported here is that the formation of new blood vessels was strongly inhibited by low concentration of betamethasone, sulindac or quinacrine, whether alone or in combination. It is known that steroidal anti-inflammatory drugs inhibit the enzymes required for the production of prostaglandins through a nuclear glucocorticoid receptor (GR) mediated mechanism. This mechanism may occur in endothelial cells as well. Considering that activity of cyclo-oxigenases 1 and 2 is inhibited by sulindac, and that these enzymes are located in the stromal tissue, we propose that the anti-angiogenic effect of these agents may occur via inhibition of both COX isoforms. On the other hand, quinacrine inhibited PLA2 activity, and we propose here that the anti-angiogenic effect occurs via inhibition of the enzyme PLA2. The potentiated effect of the association of betamethasone, sulindac and quinacrine may have some therapeutic benefit in the control of pathological angiogenesis. Further studies are required to validate these propositions


Subject(s)
Animals , Female , Mice , Anti-Inflammatory Agents, Non-Steroidal , Betamethasone , Neovascularization, Pathologic , Quinacrine , Sulindac , Anti-Inflammatory Agents, Non-Steroidal , Apoptosis , Betamethasone , Drug Therapy, Combination , Isoenzymes , Neovascularization, Pathologic , Polyurethanes , Prostaglandin-Endoperoxide Synthases , Quinacrine , Sulindac , Surgical Sponges
6.
Rev. chil. obstet. ginecol ; 53(6): 321-4, 1988. tab
Article in Spanish | LILACS | ID: lil-75771

ABSTRACT

Se efectuó un estudio de los pacientes con patología cervical, neoplasia invasora y preinvasora, analizándose las diferencias en los casos sin citología previa (grupo de prevalencia) y en los casos con una o más citologías normales previas (grupo de incidencia). Se encontraron efectos positivos del programa de detección de cáncer de cuello uterino, revelado por la disminución en la frecuencia relativa de cánceres invasores, por estadios clínicos menos avanzados y por edad más precoz de diagnóstico en mujeres con citología previa normal. Una disminución de la tasa de mortalidad es el objetivo del programa a largo plazo


Subject(s)
Humans , Female , Uterine Cervical Neoplasms/epidemiology , Chile , Uterine Cervical Neoplasms/diagnosis , Uterine Cervical Neoplasms/prevention & control
7.
Rev. chil. obstet. ginecol ; 52(1): 61-6, 1987. tab
Article in Spanish | LILACS | ID: lil-58949

ABSTRACT

Se estudian 40 mujeres no embarazadas, seleccionadas a través de la citología cervical de rutina. Veinte de ellas presentaban al Papanicolaou, signos sugerentes de infección por C. trachomatis, de acuerdo con los criterios citológicos de Gupta, P. K., y 20 sin estos signos de infección. A todas ellas se les repitió citología cervical y se comprobó la ausencia o presencia de C. trachomatis con la técnica de los anticuerpos monoclonales (Micro Trak. Syva). Sólo encontramos, con esta técnica dos pacientes con infección. Los resultados de las citologías, al ser analizadas por un solo observador, no coincidieron con las de referencia en un porcentaje importante. Lo anterior, sumado a la dificultad de reproducir los hallazos de Gupta la aparición reciente de nuevos criterios citológicos que parecen corresponder mejor con estas infecciones, obliga a descartar, por ahora, la citología como método de detección de estas infecciones, considerando, además, las implicaciones que tiene el diagnóstico errado de una enfermedad de transmisión sexual


Subject(s)
Adult , Humans , Female , Chlamydia Infections/diagnosis , Cytodiagnosis , Cervix Uteri/pathology
9.
Rev. chil. obstet. ginecol ; 51(2): 188-94, 1986. tab
Article in Spanish | LILACS | ID: lil-56705

ABSTRACT

Se analizan los diversos métodos epidemiológicos que se han empleado para investigar la eventual participación de los anticonceptivos en la génesis del carcinoma de cuello uterino. Se aplica la técnica de estudio comparativo de casos y controles en los casos de incidencia de cáncer cervico-uterino invasor pesquisados por el Servicio de Citopatología y Control de Cáncer en el área norte de Santiago. Como grupo de control se utilizaron las mujeres que no usaron ningún tipo de anticonceptivo y aquellas que utilizaron dispositivos intrauterinos. Los análisis en ambos casos, no encuentran aumento del riesgo de desarrollar un carcinoma cérvico-uterino por empleo de anticonceptivos esteroidales


Subject(s)
Humans , Female , Contraception/adverse effects , Carcinoma , Uterine Cervical Neoplasms/etiology , Epidemiologic Studies
10.
Rev. chil. obstet. ginecol ; 51(1): 9-19, 1986. ilus
Article in Spanish | LILACS | ID: lil-44552

ABSTRACT

Se analizan las caracteristicas clínicas y morfológicas de los tumores epiteliales del ovario de bajo potencial de malignidad. Se comunica una casuística de 28 casos de esta variedad de tumores. Se analizan los siguientes aspectos: edad, paridad, estadio clínico al diagnóstico, tamaño del tumor, variedad histológica, tratamiento y pronóstico


Subject(s)
Adult , Middle Aged , Humans , Female , Cystadenoma/pathology , Ovarian Neoplasms/pathology , Cystadenoma/mortality , Cystadenoma/therapy , Neoplasm Staging , Ovarian Neoplasms/mortality , Ovarian Neoplasms/therapy
11.
Rev. chil. obstet. ginecol ; 50(2): 140-9, 1985. tab, ilus
Article in Spanish | LILACS | ID: lil-33403

ABSTRACT

Motivados por las cifras de frecuencia de Chlamydia trachomatis publicadas en la literatura, efectuamos un estudio de este micro organismo en 100 embarazadas, a través de un cultivo en células de Mc Coy complementado con un estudio citológico. Las cifras de prevalencia fueron de 5,4% en la muestra estudiada con un 40% de citologías que predijeron la infección, existiendo 66,6% de citologías positivas falsas. Se efectuó seguimiento de los RN del grupo chlamydia positiva, comprobándose que un 60% desarrolló una conjuntivitis clínica y ninguno de ellos presentó neumonía. Se analizan estos dos cuadros del RN se efectúa una breve reseña de los métodos de diagnóstico


Subject(s)
Pregnancy , Adolescent , Adult , Humans , Female , Chlamydia trachomatis , Pregnancy Complications, Infectious/epidemiology , Chlamydia Infections/epidemiology , Conjunctivitis/complications , Cytodiagnosis , Trachoma/complications
12.
Rev. chil. obstet. ginecol ; 50(1): 40-8, 1985. ilus
Article in Spanish | LILACS | ID: lil-27389

ABSTRACT

Se analizan diferentes antecedentes clínicos (edad, paridad, edad de inicio de relaciones sexuales; síntomas, método anticonceptivo usado), en 402 pacientes con diagnóstico confirmado de Displasia Severa, cuyo seguimiento promedio es de cinco años. Se destaca la importancia de la Citología exfoliativa del cuello uterino, de la Biopsia dirigida por colposcopía, y el valor diagnóstico y terapéutico de la Conización del Cuello Uterino


Subject(s)
Adolescent , Adult , Middle Aged , Humans , Female , Carcinoma in Situ/diagnosis , Uterine Cervical Neoplasms/diagnosis , Cervix Uteri/surgery , Colposcopy , Cytodiagnosis , Follow-Up Studies
14.
Rev. chil. obstet. ginecol ; 49(6): 425-33, 1984. tab
Article in Spanish | LILACS | ID: lil-32000

ABSTRACT

Por la alta gravedad que revisten las infecciones herpéticas en la esfera perinatal estudiamos 100 embarazadas sanas, a las que practicamos 100 cultivos para herpes simplex, 100 serologías por fijación del complemento y 100 frotis de Papanicolaou. Encontramos una frecuencia de 2% de infección (2 pacientes); ninguma de ellas ni sus cónyuges proporcionaron antecedentes de infección herpética en el pasado. Una de ellas abortó 4 semanas después del diagnóstico, y la segunda fue sometida a operación cesárea. Recién nacido normal. La citología no demostró lesiones comtibles con virus herpes en los casos positivos. La serología nos hace suponer que la infección aparentemente se debió a virus I en el primer caso (aborto) y virus II en el segundo caso. Se efectúa una revisión bibliográfica del tema, comentando las características generales de la infección y los cambios producidos en ella en los últimos años, como el estado de excretor asintomático, lesiones atípicas; lesiones genitales por virus I; grupos de alto riesgo, etc


Subject(s)
Pregnancy , Humans , Male , Female , Pregnancy Complications, Infectious/diagnosis , Herpes Simplex/diagnosis , Complement Fixation Tests , Herpes Simplex/prevention & control , Herpes Simplex/transmission
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