Search results for "Vasopressin"

Frequency-dependent effects of activation and inhibition of protein kinase C on neurohypophysial release of oxytocin and vasopressin

1989

Isolated rat neurohypophyses were superfused in vitro and the release of vasopressin and oxytocin into the medium was determined by specific radioimmunoassays. Hormone secretion was increased by electrical stimulation of the pituitary stalk at different frequencies. The effects of several phorbol esters, known to activate (phorbol 12,13-dibutyrate, PDB) or not to affect (4a-phorbol 12,13-dideconate and phorbol 12-monoacetate) protein kinase C, and of the direct protein kinase C inhibitor 1-(5-isoquinolinylsulfonyl)-2-methylpiperazine (H7) were tested. Electrical stimulation with 450 pulses caused the release of about 45 μU vasopressin and 55 μU oxytocin, when a frequency of 3 Hz was applied…

Structural requirements for V2 vasopressin receptor proteolytic cleavage.

1999

The ligand-induced proteolytic cleavage of the V2 vasopressin receptor transiently expressed in COS cells was investigated. After incubation of the cell membranes with a photoreactive ligand possessing full agonistic properties for V2 receptors, approximately 90% of the porcine and bovine V2 vasopressin receptors were cleaved in the upper part of transmembrane helix 2 at a heptapeptide sequence conserved in both vasopressin and oxytocin receptors. The oxytocin receptor was completely resistant to proteolysis after binding the same photoreactive ligand, which is only a partial agonist for this receptor. Chimeric V2/oxytocin receptors obtained by transfer of extracellular domains of the oxyto…

Traditional Chinese herbal medicine at the forefront battle against COVID-19: Clinical experience and scientific basis.

2020

Abstract Background Throughout the 5000-year history of China, more than 300 epidemics were recorded. Traditional Chinese herbal medicine (TCM) has been used effectively to combat each of these epidemics’ infections, and saved many lives. To date, there are hundreds of herbal TCM formulae developed for the purpose of prevention and treatment during epidemic infections. When COVID-19 ravaged the Wuhan district in China in early January 2020, without a deep understanding about the nature of COVID-19, patients admitted to the TCM Hospital in Wuhan were immediately treated with TCM and reported later with >90% efficacy. Approach We conducted conduct a systematic survey of various TCM herbal pre…

Potentiation by vasopressin of adrenergic vasoconstriction in the rat isolated mesenteric artery

1997

1. The aim of the present study was to investigate in rat mesenteric artery rings whether low concentrations of vasopressin could modify the contractile responses to noradrenaline and electrical stimulation of perivascular nerves. 2. Vasopressin (10[10]-10[-7] M) caused concentration-dependent contractions (pD2 = 8.36+/-0.09). The V1-receptor antagonist d(CH2)5Tyr(Me)AVP (10[-9]-10[-8] M) produced parallel rightward shifts of the control curve for vasopressin. Schild analysis yielded a pA2 value of 9.83 with a slope of 1.10+/-0.14. 3. Vasopressin (3 x 10[-10] and 10[-9] M) caused concentration-dependent potentiation of the contractions elicited by electrical stimulation (2-8 Hz; 0.2 ms dura…

Der Einflu� von Nebennierenrindenhormonen auf die Vasopressin-Wirkung bei Wasserdiurese intakter Ratten

1959

The influence of 3 day courses of various corticosteroids on the antidiuretic and saluretic activity of vasopressin (1, 10 or 100 mU per rat s. c.) in hydrated, normal, unanesthetized rats was investigated. The corticosteroids tested were Cortisone acetate (25 mg/kg · day s. c.), Cortexone acetate (20 mg/kg · day s. c.), Cortisol acetate (25 mg/kg · day s. c.) and d.l-Aldosterone acetate (0,5 mg/kg · day s. c.).

Gef��- und Tubulusweite der Niere bei osmotischer und Wasserdiurese und nach Theophyllininjektionen

1960

The effects of i.v. administered hypertonic solutions (6-fold isotonic solutions of NaCl, sodium sulfate, glucose and mannitol) theophylline (25 mg/kg) and vasopressin (50 mE/kg) on the blood pressure, cortical kidney vessel blood content and tubulus dilatation were studied in large groups of mice. The blood pressure and blood content effects after i.p. injection of 10% NaCl solution and the blood content during water diuresis were also investigated. The kidney vessel blood content was determined through benzidine stained erythrocytes in kidney slices. An increase in blood content as compared to corresponding controls was consistently noted after i.v. injection of 6-fold isotonic solutions …

Die Beeinflussung eines experimentellen Stauungs�dems der Ratte durch Chlorothiazid, Hydrocortison, Dexamethason, DOCA und Vasopressin

1960

Experiments on rats were made to determine which drugs were capable of preventing the formation of an experimental obstruction edema.

Oxytocin receptor ligands: a survey of the patent literature

2008

Background: Oxytocin is produced primarily in hypothalamic neurons and is secreted from the posterior pituitary gland into the circulation in response to stimuli such as suckling, parturition, or stress. Oxytocin functions as an essential component in milk ejection and is among the most potent uterotonic substances known. The oxytocin receptor system supports physiological processes associated with reproduction at several levels. Objective: To characterize and evaluate oxytocin receptor ligands for therapeutic applications. Methods: Analysis of oxytocin analogs and nonpeptide oxytocin receptor ligands, and major applications of these substances. Results/conclusion: Oxytocin receptor ligands…

Calcium dependence of the evoked arginine vasopressin release by electrical stimulation and by L-glutamate.

1989

Die Wirkung von Vasopressin auf die renale Wasser- und Salzausscheidung der Ratte bei Ver�nderungen der Salzkonzentration des Trinkwassers und nach N…

1956

An 13 Hypertonikern und 6 gesunden Personen wurden die Vergnderungen im funktionellen Zustand der BlutgefaBe der unteren Extremitaten nach Einspritzung yon isotonischer (1,8%) Magnesiumsulfatlosung in Dosen zu 5–25 cm3 und hypertonischer (10% und 25%) MagnesiumsulfatlSsung in Dosen yon 2–10 cm3 untersueht. Bei schnellem Einspritzen trat meistens Volumenverringerung der Extremitat ein, wahrend bei langsamem Einspritzen Vergroβerung oder Zweiphasenvergnderung erfolgte, die als Volumenverringerung und darauf folgende Volumenvergroβerung der Extremitat in Erscheinung trat. Die isotonische Losung verursacht entweder Volumenvergroβerung der Extremitat oder Zweiphasenveranderung — Verringerung und…