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2.
Isr J Med Sci ; 16(11): 756-60, 1980 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-7192273

RESUMEN

Glucocorticoid- and androgen-binding receptors were demonstrated in cytosol of human renal cell carcinomas by the dextran-coated charcoal technique. Sedimentation studies using preparative ultracentrifugation indicated a 7 to 8 S binding component. None of the renal carcinoma cells tested contained detectable estrogen receptors and a few samples had a very low but demonstrable progestin receptor level. In the normal kidneys tested, cytoplasmic components that bound only androgen could be detected. Competition studies showed that progestin competed for the glucocorticoid receptor sites in all the renal tumors tested, whereas diethylstilbestrol and testosterone were weak or not competitive. It is suggested that the response of some patients with renal carcinoma to high doses of progesterone or androgens could be explained by the ability of these hormones to block the activity of glucocorticoid receptors, which might be involved in tumor growth.


Asunto(s)
Adenocarcinoma/metabolismo , Neoplasias Renales/metabolismo , Receptores Androgénicos/metabolismo , Receptores de Glucocorticoides/metabolismo , Receptores de Esteroides/metabolismo , Anciano , Citosol/metabolismo , Dexametasona/metabolismo , Dietilestilbestrol/metabolismo , Femenino , Humanos , Masculino , Persona de Mediana Edad , Promegestona/metabolismo , Receptores de Progesterona/metabolismo , Testosterona/metabolismo
15.
J Exp Med ; 131(3): 443-60, 1970 Mar 01.
Artículo en Inglés | MEDLINE | ID: mdl-5413325

RESUMEN

This investigation studies the toxicity of heme proteins and/or their break-down products on renal function. Heme proteinemia precedes acute tubule necrosis at a frequency great enough to suggest a causal relationship between the two events. Physiological and metabolic functions of kidney slices are investigated in several models of acute tubule necrosis. Organic acid and organic base transport is depressed earliest. These alterations in tubule function cannot be explained by ischemia or obstruction alone. Heme proteinemia in rats or incubation of renal slices in medium containing heme proteins yields several interesting observations. Neither in vivo or in vitro do hemoglobin and methemoglobin alone produce a depressive effect on the transport systems studied. However, parallel to many clinical situations, when such secondary insults as hypoxia and elevated ammonia concentrations are included in the experimental design, transport functions are depressed. Ferrihemate, a molecule smaller than hemoglobin or methemoglobin, depresses transport function without secondary insults. From these studies it is concluded that heme proteins play a role in tubule dysfunction seen in acute tubule necrosis. A model is presented that collates these data with other factors known to play a part in the pathogenesis of this renal syndrome.


Asunto(s)
Proteínas Sanguíneas , Glicerol , Hemo , Hemoglobinas , Enfermedades Renales/inducido químicamente , Túbulos Renales , Lesión Renal Aguda/inducido químicamente , Animales , Pruebas de Función Renal , Necrosis , Conejos , Ratas
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