We tested the hypothesis that the de-endothelialized artery rings from the left anterior descending (LAD) coronary artery and its left ventricular branch (LVB) differ in their contractile responses to Na(+)-Ca(2+)-exchanger (NCX) mediated Ca(2+)-entry, muscarinic receptor activation with carbachol, and sarco/endoplasmic reticulum Ca(2+) pump (SERCA) inhibition with thapsigargin. In LVB, the force of contraction (in N/g tissue) produced by the NCX mediated Ca(2+)-entry (17.5 +/- 1.4) and carbachol (18 +/- 1.5) was only slightly smaller than that due to membrane depolarization with KCl (24.0 +/- 1.0). In contrast, in LAD the force of contraction produced with NCX (8.7 +/- 0.7) and carbachol (6.1 +/- 1.1) was much smaller than with KCl (15.7 +/- 0.7). Thapsigargin also contracted LVB with greater force than LAD. When isolated microsomes were used, the binding to the muscarinic receptor antagonist quinuclidinyl benzilate was greater in LVB than in LAD. Microsomes were also used for Western blots. The intensities of signals for both SERCA and NCX were greater in LVB than in LAD. These biochemical observations were consistent with the contractile experiments. Thus, it appears that the differences between LAD and the resistance arteries may begin as early as LVB.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4516523 | PMC |
| http://dx.doi.org/10.1111/j.1582-4934.2009.00872.x | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
T-Shaped Wedge Resection of the Upper Eyelid: An Alternative to the Pentagonal Wedge.
Ophthalmic Plast Reconstr Surg
January 2025
Department of Ophthalmology, Columbia University Medical Center, New York, New York.
Purpose: To report the experience with an alternative to the upper eyelid pentagonal wedge resection technique which results in improved cosmesis due to a greater alignment of incisions with relaxed skin tension lines.
Methods: A retrospective review of all patients who underwent the T-shaped wedge resection by the authors from 2009 to 2017. A horizontal eyelid crease incision is made across the upper eyelid skin.
Surgical management of dysphagia due to diffuse idiopathic skeletal hyperostosis: the role of barium swallow fluoroscopy-a case report.
J Spine Surg
December 2024
Spine Clinic, Elsan Jean Villar Private Hospital, Bordeaux, France.
Background: Diffuse idiopathic skeletal hyperostosis (DISH) is a systemic condition that might lead to dysphagia because of massive osteophytes that may be present at multiple levels. Confirming the symptomatic level to guide surgical management and avoid extensive surgery is important, however, there is no globally accepted consensus on the topic.
Case Description: We report the case of a 51-year-old man, with no specific past medical history, who has been complaining of a 3-months pain in the left side of the tongue base with sensation of a lump in the throat and dysphagia.
Pregnancy-Related Spontaneous Coronary Artery Dissection in a 25-Year-Old Woman: A Case Report.
Sisli Etfal Hastan Tip Bul
December 2024
Department of Cardiovascular Surgery, Basaksehir Cam and Sakura City Hospital, Istanbul, Türkiye.
Pregnancy-related spontaneous coronary artery dissection (P-SCAD) is a life-threatening condition that occurs during or after pregnancy, is rare and can be overlooked. It is one of the most important causes of pregnancy-related acute myocardial infarction. A 25-year-old female patient was admitted with a complaint of chest pain in her 37th week of pregnancy.
View Article and Find Full Text PDFAberrant functional connectivity between the retrosplenial cortex and hippocampal subregions in amnestic mild cognitive impairment and Alzheimer's disease.
Brain Commun
December 2024
Department of Radiology, Aerospace Center Hospital, Beijing 100049, China.
The posterior cingulate cortex and hippocampus are the core regions involved in episodic memory, and they exhibit functional connectivity changes in the development and progression of Alzheimer's disease. Previous studies have demonstrated that the posterior cingulate cortex and hippocampus are both cytoarchitectonically heterogeneous regions. Specifically, the retrosplenial cortex, typically subsumed under the posterior cingulate cortex, is an area functionally and anatomically distinct from the posterior cingulate cortex, and the hippocampus is composed of several subregions that participate in multiple cognitive processes.
View Article and Find Full Text PDFRetrieval of Entrapped Embolic Protection Device during Carotid Artery Stenting: A Case Report.
Ann Ital Chir
January 2025
Institute of Central Nervous System Vascular Injury and Repair, Jining Medical Science Research Institute, The First People's Hospital of Jining, 272000 Jining, Shandong, China.
Aim: This study aims to report a rare case of an embolization protection device (EPD) entrapment during Carotid Artery Stent (CAS) and to discuss the management strategy, including open surgery and concurrent carotid endarterectomy (CEA).
Case Presentation: A 71-year-old female presented with left limb weakness and unclear speech following CAS. Imaging revealed a new cerebral infarction and right internal carotid artery stenosis.
Want 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!