J J Mrotek

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Ultrastructural and cell fractionation studies implicate lipid droplets in the storage of cholesterol and in the secretion of steroids. To evaluate the role of the lipid droplet in steroidogenesis, a discontinuous gradient centrifugation method has been developed for the isolation of both lipid droplet and non-lipid fractions from decapsulated rat adrenal(More)
Effects of chronic ethanol exposure on N-methyl-D-aspartate (NMDA) receptor function were examined in hippocampal neurons. Rat hippocampal neurons grown in culture were chronically exposed to 100 mM ethanol to examine mechanisms that could underlie ethanol-induced changes in receptor function and excitotoxicity. NMDA-stimulated, but not kainic(More)
Sexually experienced male rats were injected IP with 0, 0.3, 1.5, 3.0, or 6.0 mg/kg cadmium chloride. The highest dose was fatal within 48 h of injection. A dose-related deficit in erectile function was observed in ex copula tests 48 h after injection. Copulatory dysfunction was evident in mating tests 72 h after injection. Hepatic mixed function oxidase(More)
OBJECTIVE Because glucocorticoids stimulate leptin release and, at least in vitro, leptin inhibits cortisol secretion, a feedback system between glucocorticoids and leptin has been proposed. However, in humans and non-human primates there are no in vivo studies to support any role for leptin in the control of the hypothalamic-pituitary-adrenal axis. In this(More)
Sexual function was examined in spontaneously hypertensive rats (SHR) from 8 to 20 wk of age and compared with normotensive Wistar-Kyoto (WKY) and Long-Evans rats (LE). Blood pressures (evaluated indirectly) were elevated in SHR (185 +/- 2 and 195 +/- 3 mmHg at 16 and 19 wk of age, respectively) relative to WKY and LE (135-144 mmHg). SHR exhibited good(More)
Using cultured Y-1 mouse adrenal tumor cells which produce 20 alpha-hydroxy-4-pregnen-3-one (20-DHP), it was found that 0.01 mM corticosterone and deoxycorticosterone increased basal and inhibited ACTH-induced 20-DHP production during consecutive 30 and 120 min incubations. Steroid effects were concentration-dependent and reversible. Six other steroids(More)
Zona fasciculata-reticularis subcellular structures were implicated in corticosterone transport and secretion by noting changes in subcellular corticosterone during a 30-min period following ACTH stimulation. Six decapsulated adrenal homogenate subcellular fractions separated by gradient centrifugation were characterized cytochemically and morphologically.(More)
An improved technique is described for the extraction and analysis of corticosterone (11 beta,21-dihydroxy-4-pregnene-3,20-dione) from homogenates and subcellular fractions of the rat adrenal cortex. Factors influencing complete extraction of corticosterone were the nature of the organic solvent system and the concentration of the tissue being extracted.(More)
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