Activation of the sympathetic system by phencyclidine (PCP) should result in catecholamine release from the adrenals. However, adrenalectomy does not reduce PCP-induced hypertension. In an attempt to rectify this inconsistency, the direct effects of PCP on the bovine adrenal medulla were examined. At (3 X 10(-6) M), PCP reduced the acetylcholine-(ACh)-induced catecholamine release by 50%. Surprisingly, barium-induced secretion of catecholamines was also reduced by PCP. ACh-induced catecholamine release was not altered by 10(-3)M 4-aminopyridine (4 AP), the potassium channel blocker. Thus, calcium antagonist actions of PCP and consequent block of catecholamine secretion from adrenal medulla may explain the lack of effect of adrenalectomy on PCP-induced hypertension. Possible contributions of calcium and/or potassium channel blockade to other manifestations of PCP overdosage are discussed.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/0024-3205(83)90124-8 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The brainstem reticular formation pivots abnormal neural transmission in the course of Anorexia Nervosa.
J Neural Transm (Vienna)
January 2025
Human Anatomy, Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Via Roma 55, Pisa, 56100, PI, Italy.
Anorexia nervosa (AN) represents an eating disorder, which features the highest rate of mortality among all psychiatric disorders. The disease prevalence is increasing steadily, and an effective cure is missing. The neurobiology of the disease is largely unknown, and only a few studies were designed to disclose specific brain areas, where altered neural transmission may occur.
View Article and Find Full Text PDFIdentification of the subventricular tegmental nucleus as brainstem reward center.
Science
January 2025
Laboratory of Cerebral Cortex Research, HUN-REN Institute of Experimental Medicine, Budapest, Hungary.
Rewards are essential for motivation, decision-making, memory, and mental health. We identified the subventricular tegmental nucleus (SVTg) as a brainstem reward center. In mice, reward and its prediction activate the SVTg, and SVTg stimulation leads to place preference, reduced anxiety, and accumbal dopamine release.
View Article and Find Full Text PDFRobotic-assisted excision of left para-aortic paraganglioma: a novel approach.
J Surg Case Rep
January 2025
Department of Endocrine Surgery, Royal Victoria Infirmary, Newcastle Upon Tyne NE1 4LP, United Kingdom.
Paragangliomas, a type of extra-adrenal tumour, albeit rare, are dangerous due to their high metastatic potential and risk of hypertensive crisis from massive catecholamine release. It typically presents with sympathetic overdrive symptoms such as diaphoresis, headache, and palpitation, accompanied by substantially high plasma metanephrines level and mass on contrasted computed tomography abdomen and pelvis, whilst some are found incidentally. In this report, we discuss a case of an extra-adrenal lesion located near susceptible major structures with extensive vascularisation, in a patient with near-death experience.
View Article and Find Full Text PDFStress-induced cardiomyopathy by dobutamine stress echocardiography during recovery stage - A rare presentation.
J Cardiol Cases
October 2024
Department of Cardiovascular Diseases, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
Unlabelled: Stress-induced cardiomyopathy is a condition of acute myocardial suppression following an abrupt release of endogenous catecholamines after emotional or physical stress. The exact mechanism is unknown but there are reports of a similar clinical presentation after injection of exogenous catecholamines such as beta agonists. We report a rare type of stress-induced cardiomyopathy following injection of dobutamine during a diagnostic stress echocardiography.
View Article and Find Full Text PDFActivation of locus coeruleus noradrenergic neurons rapidly drives homeostatic sleep pressure.
Sci Adv
January 2025
Department of Neuroscience, Helen Wills Neuroscience Institute, Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720, USA.
Homeostatic sleep regulation is essential for optimizing the amount and timing of sleep for its revitalizing function, but the mechanism underlying sleep homeostasis remains poorly understood. Here, we show that optogenetic activation of locus coeruleus (LC) noradrenergic neurons immediately increased sleep propensity following a transient wakefulness, contrasting with many other arousal-promoting neurons whose activation induces sustained wakefulness. Fiber photometry showed that repeated optogenetic or sensory stimulation caused a rapid reduction of calcium activity in LC neurons and steep declines in noradrenaline/norepinephrine (NE) release in both the LC and medial prefrontal cortex (mPFC).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!