1. Crural, mesenteric and pulmonary vessels obtained during surgery were studied. Isometric tension was recorded and contractions were induced by potassium 127 mM (K), noradrenaline 18 microM (NA), prostaglandin F2 alpha 2.9 microM (F2 alpha), ergotamine 3.8 microM (Erg) or digoxin 1.0 microM (Dig). 2. Spontaneous myogenic activity was only observed in pulmonary veins. F2 alpha induced spontaneous activity in mesenteric arteries. 3. In all types of vessels, except in mesenteric arteries, the response to K+ had a greater amplitude than contractions developed by NA. Erg induced a slowly developing contraction in mesenteric veins but no contraction in mesenteric arteries. Dig induced a long-lasting monophasic response in arteries and a biphasic response in the veins. 4. After immersion for 30 min in a Ca-free medium the amplitudes to both NA and K+ were significantly reduced. The veins were more susceptible to the effects of Ca-deprivation than the arteries.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/0306-3623(83)90071-x | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Technical and clinical outcomes of 13 years of endovascular repair of infrarenal, atherosclerotic, penetrating aortic ulcers.
Ann Vasc Surg
January 2025
Department of Vascular and Endovascular Surgery, University Hospital Heidelberg, Heidelberg, Germany.
Objectives: To report the technical and clinical outcomes of endovascular repair of all infrarenal, penetrating aortic ulcers (PAU) that were treated at a single institution over a 13-year period.
Methods: This is a single-center, retrospective observational study. All patients consecutively treated for atherosclerotic, infrarenal PAU were included between 2010 and 2023.
Nitrite reverses nitroglycerin tolerance via repletion of a nitrodilator-activated nitric oxide store in vascular smooth muscle cells.
Redox Biol
January 2025
Department of Pediatrics, Division of Neonatology, Loma Linda University School of Medicine, Loma Linda, CA, USA; Lawrence D. Longo, MD Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, CA, USA. Electronic address:
Repeated use of nitroglycerin results in a loss of its vasodilatory efficacy which limits its clinical use for the treatment of angina pectoris. This tolerance phenomenon is a defining characteristic of all compounds classified as nitrodilators, which includes NTG as well as S-nitrosothiols and dinitrosyl iron complexes. These compounds vasodilate via activation of soluble guanylate cyclase, although they do not release requisite amounts of free nitric oxide (NO) and some do not even cross the plasma membrane.
View Article and Find Full Text PDFEndothelial-specific knockout of the scramblase TMEM16F impairs in vivo clot formation.
Shock
January 2025
Pharmacology, University of Vermont, Burlington, VT.
Objective: Loss of function of the phospholipid scramblase (PLS) TMEM16F results in Scott Syndrome, a hereditary bleeding disorder generally attributed to intrinsic platelet dysfunction. The role of TMEM16F in endothelial cells, however, is not well understood. We sought to test the hypothesis that endothelial TMEM16F contributes to hemostasis by measuring bleeding time and venous clotting in endothelial-specific knockout (ECKO) mice.
View Article and Find Full Text PDFDouble Cystic Artery Originating From the Superior Mesenteric Artery and Right Hepatic Artery: A Case Report.
Cureus
December 2024
Medicine, Griffith University, Gold Coast, AUS.
The cystic artery is a critical anatomical landmark in both laparoscopic and open cholecystectomy. This report presents a unique case involving two rare anatomical variations: double cystic arteries, along with a superficial branch originating from the superior mesenteric artery (SMA) - a previously unreported combination with significant clinical and surgical implications. Unlike earlier studies, this research provides detailed anatomical and embryological insights supported by high-quality imaging and illustrations to guide surgeons in recognizing and managing this novel variation.
View Article and Find Full Text PDFObesity-induced mesenteric PVAT remodelling is sexually dimorphic, but not driven by ovarian hormones : Short title: Obesity induces sex-specific responses in mesenteric PVAT.
Cardiovasc Diabetol
January 2025
Centre for Cardiovascular Science, University of Edinburgh, Edinburgh, Scotland, UK.
Background: Obesity, a major risk factor for cardiovascular disease (CVD), is associated with hypertension and vascular dysfunction. Perivascular adipose tissue (PVAT), a metabolically active tissue surrounding blood vessels, plays a key role in regulating vascular tone. In obesity, PVAT becomes dysregulated which may contribute to vascular dysfunction; how sex impacts the remodelling of PVAT and thus the altered vascular contractility during obesity is unclear.
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!