An investigation was made into the nature of the role played by the noradrenergic innervation of the pacinian corpuscle. Corpuscles of the cat mesentery and mesocolon were used in all experiments. Blockade of noradrenergic beta receptors by dichloroisoproterenol and interference with norepinephrine release by reserpine are each capable of reversibly blocking mechanoelectric transduction by the ...

Background & Aim: Homalium letestui Pellegr (Flacourtiaceae) used traditionally by the Ibibios of Southern Nigeria to treat stomach ulcer, malaria and other inflammatory diseases was evaluated for antiulcer properties.  Experimental: The effects of ethanol stem extract of H. letestui (200 – 600 mg/kg) and fractions (Aqueous and Dichloromethane, 400 mg/kg) on experimentally in...

Intraperitoneal (IP) injection of bupropion (3,6, amine (4,16 mg kg•') induced dose-dependent climbing in mice. The climbing response induced by both drugs were decreased in animals pretreated either with the 0-1 antagonist SCH 233<)0 or the 0-2 antagonist sulpiride. The α-adrenoceptor blocker phenoxybenzamine decreased the climbing induced by both bupropion and amphetamine, but the β-ad...

The uptake and efflux of the isotopic tracer 45Ca were compared in dispersed submandibular acini of both control rats and rats treated with seven daily doses of reserpine (0.5 mg/kg, i.p.). Tracer uptake occurred in a time-dependent manner in both types of acini and reached 8.4 +/- 0.2 and 8.0 +/- 0.2 pmol/mg protein, respectively, in acini from control and treated animals after 60 min of incub...

It has become increasingly apparent that evaluation of human norepinephrine metabolism simply by assay of catecholamines in urine is inadequate for differentiation of many physiological or pathological states. In an attempt to examine norepinepherine metabolism in the human subject, tritium-labeled d,l-norepinephrine was administered to 11 normal adults and the definitive turnover rates and rel...

BACKGROUND Marked decreases in cardiac responses to beta-adrenergic stimuli have been found in cellular, animal, and human models of physiologic aging. As another probe of receptor-regulated cardiovascular changes with aging, responses to dopamine were studied. Responses were studied with and without depletion of myocardial catecholamines to eliminate effects secondary to myocardial catecholami...