1. Influx and efflux of catecholamine and adenosine triphosphatase activity were studied in storage vesicles of bovine adrenal medulla. 2. In the absence of ATP the influx of catecholamine was slow and was not influenced by various anions, whereas the efflux increased in the sequence of anions given by the lyotrophic series. 3. In the presence of ATP the efflux was enhanced compared with that i...

The catecholamine excretion rates in urine were studied in three groups of patients with acute myocardial infarction. Group I patients had no complications. Group II patients had minor complications. In groups I and II urine was obtained during the first night of the patient's admission. Group III patients had major complications, and urine was collected during one episode of complications. Cat...

STEINSLAND, ODD S., STANLEY S. PASSO, AND GABRIEL G. NAHAS. B@hasic effect of hypoxia on adrenal catecholamine content. Am. \ J. Physiol. 2 18(4) : 995-998. 1970.-The adrenal catecholamine content of guinea pigs and rats exposed to 7.5 y0 oxygen in nitrogen for periods of 4, 8, and 12 hr decreased significantly ( -40% after 12 hr). With more prolonged exposure, adrenal catecholamine content inc...

Plasma catecholamine concentrations were estimated in a group of 17 fasting patients immediately before and 3 days after cardiac catheterisation. At both times electrocardiograms were recorded and blood pressures, heart rates, and respiration rates measured. Control catecholamine values were established in a group of 10 male and 10 female volunteers, bled at the same time of day under the same ...

Cultured principal neurons of the superior cervical ganglion (SCG), which coexpress high levels of catecholamines and neuropeptide Y (NPY), were used as a model to simultaneously examine whether sympathetic neuronal peptide and transmitter content or secretion are differentially regulated. Accumulation of NPY immunoreactivity and the dopamine metabolites DOPAC and HVA in SCG neuronal conditione...

The marine dogfish (Squalus acanthias) and the seawater-adapted rainbow trout (Oncorhynchus mykiss) were exposed to acute environmental hypercapnia or hypoxia to evaluate (i) the dynamics of catecholamine release into the circulation and (ii) the impact of catecholamine release on gill ventilation and blood oxygen transport. This comparison was undertaken to test the hypothesis that the pattern...

Prolonged overexposure to catecholamines causes toxicity, usually credited continuous adrenoceptor stimulation, autoxidation, and the formation of reactive pro-oxidant species. Non-differentiated SH-SY5Y cells were used study possible contribution oxidative stress in adrenaline (ADR)-induced neurotoxicity, as a model predict toxicity this catecholamine peripheral nerves. Cells exposed several c...

The response of cannulated rainbow trout (Oncorhynchus mykiss) to acute hypoxia was studied in fish acclimated to two temperatures (5 and 15 °C). Blood/water respiratory variables and plasma catecholamine levels were measured before and 15 min after exposure to hypoxic water varying between 4.0 and 10.7 kPa (30­80 mmHg) oxygen partial pressure (PwO2). Arterial blood PO2 (PaO2) and oxyge...