Age-related changes in the contractile response to endothelin-1 and ACh were assessed in thoracic aortas isolated from 2-, 6- and 24-month-old male Fischer 344 rats. In aortic strips with an intact endothelium, the maximal contractile response to endothelin-1 decreased with development to maturity. Removal of the endothelium did not affect the contractile response to endothelin-1. Endothelin-1 did not elicit a relaxant response in phenylephrine-precontracted strips. The ACh-induced relaxation decreased in senescent rats. These results indicate that the contractile response of aortic smooth muscle to endothelin-1 decreases with age, and that the endothelial vasorelaxant factors do not contribute to this age-induced modulation.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/0014-2999(91)90689-n | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Enteric neuronal substrates underlying spontaneous and evoked neurogenic contractions in mouse colon.
Cell Mol Gastroenterol Hepatol
January 2025
Dept of Physiology & Cell Biology, University of Nevada Reno School of Medicine, Reno, NV. Electronic address:
Background And Aims: Gastrointestinal motility persists when peripheral cholinergic signaling is blocked genetically or pharmacologically, and a recent study suggests nitric oxide drives propagating neurogenic contractions.
Methods: To determine the neuronal substrates that underlie these contractions, we measured contractile-associated movements together with calcium responses of cholinergic or nitrergic myenteric neurons in un-paralyzed ex vivo preparations of whole mouse colon. We chose to look at these two subpopulations because they encompass nearly all myenteric neurons.
Transcranial Magnetic Stimulation Inter-Pulse Interval Does Not Influence Corticospinal Excitability to the Biceps Brachii During Submaximal Isometric Elbow Flexion.
Eur J Neurosci
January 2025
Department of Kinesiology, Trent University, Peterborough, ON, Canada.
Previous research on resting muscles has shown that inter-pulse interval (IPI) duration influences transcranial magnetic stimulation (TMS) responses, which can introduce serious confounding variables into investigations if not accounted for. However, it is far less clear how IPI influences TMS responses in active muscles. Thus, the purpose of this study was to examine the relationship between IPI and corticospinal excitability during submaximal isometric elbow flexion.
View Article and Find Full Text PDFFailed stopping transiently suppresses the electromyogram in task-irrelevant muscles.
eNeuro
January 2025
Action Control Lab, Department of Human Physiology, University of Oregon, Eugene, Oregon, USA.
Selectively stopping individual parts of planned or ongoing movements is an everyday motor skill. For example, while walking in public you may stop yourself from waving at a stranger who you mistook for a friend while continuing to walk. Despite its ubiquity, our ability to selectively stop actions is limited.
View Article and Find Full Text PDFVoltage-Gated Calcium Channels and the Parity-Dependent Differential Uterine Response to Oxytocin in Rats.
Reprod Sci
January 2025
Department of Physiology, College of Graduate Studies, Midwestern University, Downers Grove, IL, 60515, USA.
The experience of pregnancy affects uterine function well beyond delivery. We previously demonstrated that the response to oxytocin is more robust in the uteri of proven breeder rats. This study investigates the contribution of T-type calcium channels (TTCCs) and L-type calcium channels (LTCCs) to the distinct response of virgin (V) and proven breeder (PB) rat uteri to oxytocin.
View Article and Find Full Text PDFCartilaginous microtissues exhibit extreme resilience under compression with size-dependent mechanical properties.
Biomaterials
January 2025
Prometheus Division of Skeletal Tissue Engineering, KU Leuven, O&N1, Herestraat 49, PB 813, 3000, Leuven, Belgium; Skeletal Biology and Engineering Research, KU Leuven, ON1 Herestraat 49, PB 813, 3000, Leuven, Belgium. Electronic address:
Self-assembled cartilaginous microtissues provide a promising means of repairing challenging skeletal defects and connective tissues. However, despite their considerable promise in tissue engineering, the mechanical response of these engineered microtissues is not well understood. Here we examine the mechanical and viscoelastic response of progenitor cell aggregates formed from human primary periosteal cells and the resulting cartilaginous microtissues under large deformations as might be encountered in vivo.
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!