F. J. Kouchich

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The influence of a 60-min exposure to 75% nitrous oxide/25% oxygen upon concentrations of methionine-enkephalin-like immunoreactivity (MELI) in discrete brain regions was investigated in conscious rats. Compared to room air-exposed control animals, nitrous oxide-exposed rats had 12-18% increases in MELI in the brainstem, spinal cord, hypothalamus and corpus(More)
The dopaminergic agonist apomorphine produced dose-dependent stereotypic climbing behavior in mice housed in cages with vertical bars. This drug effect was competitively inhibited by systemic pretreatment with the centrally acting dopaminergic antagonist haloperidol but not by microwave irradiation (2.45 GHz, 20 mW/cm2, CW, 10 min) nor by systemic(More)
Increased concentrations of immunoreactive methionine-enkephalin but not leucine-enkephalin were measured in fractions of cerebrospinal fluid perfusate collected from ventricular-cisternally perfused, urethane-anesthetized rats exposed to a mixture of 75% nitrous oxide/25% oxygen for 60 min. These findings suggest that nitrous oxide might be capable of(More)
Exposure of rats to high levels of nitrous oxide (N2O) in oxygen (O2) reduced body temperature in a concentration-related manner. The hypothermia was partly reversed by pretreatment with naloxone but not naltrexone. But in rats rendered tolerant to morphine by pellet implantation, exposure to 75% N2O/25% O2 evoked a marked hypothermia similar to that(More)
We determined by radioimmunoassay concentration of dynorphin-(1-13)-like immunoreactivity in the central nervous system and pituitary gland of spontaneously hypertensive rats (SHRs) and normotensive Wistar-Kyoto rats (WKYs). Compared to WKYs, SHRs had significantly lower levels of dynorphin-(1-13)-like immunoreactivity in the hypothalamus and pituitary(More)
Chronic administration of naloxone by means of miniosmotic pumps retarded the development of hypertension in young spontaneously hypertensive rats (SHRs) in a dose-related manner. Abrupt termination of naloxone treatment resulted in acceleration in the rate of the blood pressure increase, while increasing the naloxone concentration further slowed the(More)
Intravenous naloxone or naltrexone produced transient, dose-related reductions in the mean arterial pressure (MAP) and heart rate (HR) of urethane-anesthetized spontaneously hypertensive rats (SHRs). Yet these same doses of narcotic antagonists reduced HR but not MAP of normotensive Wistar-Kyoto rats (WKYs). Such effects were not observed upon(More)
Systemic pretreatment with naloxone but not its (+)-enantiomer significantly potentiated apomorphine-induced stereotypic climbing activity in mice. Systemic or central pretreatment with naltrexone also significantly potentiated the apomorphine drug effect. The N-methyl derivative of naltrexone had no influence when administered systemically but(More)
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