I G Sipes

Learn More
Vitamin A (VA, retinol) has been shown to modulate cells of the immune system. When rats are pretreated with VA (75 mg/kg/day) for 7 days, there is greatly potentiated liver damage upon subsequent exposure to hepatotoxicants such as CCl4. This potentiated damage can be blocked by superoxide dismutase or catalase, suggesting that reactive oxygen species are(More)
Capsaicin depleted substance P from guinea pig dorsal root ganglia and inhibited the retrograde axoplasmic transport of nerve growth factor (NGF). Doses of capsaicin which depleted substance P also inhibited the retrograde axoplasmic transport of NGF. Inhibition of the retrograde transport of NGF by capsaicin preceded substance P depletion. Supplementation(More)
The toxicokinetics of salicylazosulfapyridine (SASP) and its metabolites were investigated in male and female B6C3F1 mice either following single intravenous (5 mg/kg) or oral (67.5, 675, 1350, and 2700 mg/kg) doses, or following three consecutive daily oral doses (675, 1350, and 2700 mg/kg). Plasma concentrations of SASP and its metabolites were quantified(More)
Repeated daily dosing of rats with the occupational chemical 4- vinylcyclohexene or its diepoxide metabolite (VCD) for 15 days destroys the smallest ovarian follicles. VCD acutely reduced hepatic levels of the antioxidant, glutathione (GSH); therefore, these studies were designed to evaluate whether GSH concentrations mediate VCD-induced ovotoxicity.(More)
Capsaicin and its analog, dihydrocapsaicin, produced chemogenic and thermal antinociception and depletion of substance P from the dorsal spinal cord and dorsal root ganglia of guinea pigs following a single parenteral dose. Time course and distribution studies indicated that capsaicinoid-induced antinociception resulted from neither depletion of substance P(More)
The "ocular zingerone test" was employed to detect early alterations in peripheral nerve function which were associated with acrylamide intoxication in the rat. Acrylamide treatment resulted in a dose-related prolongation of the behavioral response to ocular zingerone. Significant alterations in the zingerone response occurred prior to detectable(More)
Halothane (1,1,1-trifluoro-2-bromo-2-chloroethane) is a safe, clinically useful inhalation anesthetic. Rare, unpredictable cases of liver necrosis have been reported following its use. Although the mechanism of this reaction in man is unknown the most plausible is biotransformation to reactive intermediates compounds. The oxidative metabolism of halothane(More)
In this manuscript we report our attempts to determine if 14C-halothane or its metabolites interact with DNA. Three bioactivation systems were used: in vitro microsomal incubations, isolated hepatocytes, and in vivo administration. Even though we used optimal conditions for bioactivation, no significant covalent binding of 14C to DNA was observed. Slight(More)
  • 1