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Expression of alpha 4 and alpha 7 nicotinic receptors in the brainstem of female rabbits after coitus.
Brain Res
June 2004
Division of Reproductive Sciences and Neuroscience, Oregon National Primate Research Center/Oregon Health and Science University, Beaverton 97006, USA.
Coital signaling in the female rabbit involves sequential events in the brainstem and hypothalamus, resulting in a massive release of hypothalamic gonadotropin-releasing hormone (GnRH) that peaks within 1-2 h after mating. The neural connections between coitus and GnRH release involves norepinephrine (NE) and acetylcholine (ACh) since administration of antagonists against NE (dibenamine or phentolamine) or ACh (atropine, alpha-bungarotoxin (alpha-BTX) or scopolamine) blocks or attenuates ovulating events. Moreover, hypothalamic NE release and brainstem tyrosine hydroxylase (TH, the rate-limiting enzyme for NE synthesis) expression in the noradrenergic areas increase prior to, or in concert with, the preovulatory GnRH surge.
View Article and Find Full Text PDFPhysiological color change in the bullfrog, Rana catesbeiana.
J Exp Zool
February 1999
Departamento de Fisiologia, Universidade de São Paulo, Brasil.
Adults of Rana catesbeiana maintained for 4 days in 12:12 light/dark regimen exhibited a rhythmic color change of 24 hr. Under constant light, however, the rhythm disappeared, and the reflectance values gradually became greater, that is the animals became lighter. Under constant darkness, the rhythm was also abolished, but the animals tended to a darker color.
View Article and Find Full Text PDF1. A method is described for measuring continuously the efflux of potassium or rubidium from smooth muscle of the guinea-pig. 2.
View Article and Find Full Text PDFInteractions between responses mediated by activation of adenosine A2 receptors and alpha 1-adrenoceptors in the rabbit isolated aorta.
Br J Pharmacol
June 1993
Department of Pharmaceutical Sciences, College of Pharmacy and Allied Health Professions, St. John's University, Jamaica, New York 11439.
1. This paper describes aspects of the functional antagonism between the responses mediated by activated alpha 1-adrenoceptors and adenosine A2 receptors in the adventitia- and endothelium-denuded aorta of the rabbit. 2.
View Article and Find Full Text PDFAlpha 2-adrenoceptor control of ion and water transport in the newt renal distal tubule.
Physiol Res
March 1993
Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, St. Petersburg.
To study the nature of adrenergic stimulation of ions and water reabsorption in the newt renal distal tubule, stationary microperfusion of the nephron and electron probe analysis were used. After application of norepinephrine (NE 10(-6) M) to the tubule surface, the fractional reabsorption of fluid increased from 15.0 +/- 3.
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