Effect of modification of potential-dependent calcium channels in cells of the upper lobe of the salivary gland in Chironomus larva has been ascertained in the Ca-free medium containing Ca-binding substances (EGTA or EDTA). It is shown that the inward current depends on the sodium transmembrane gradient. The amplitude of the inward sodium current decreases under the influence of verapamil as well as with an increase of external concentration of Ca2+ ions. The metabolic dependence of modified calcium channels as well as the pharmacological sensitivity are unchanged. Tau n of the sodium current through modified calcium channels increases insignificantly comparing with that of the calcium current. Maximum of the current-voltage relationship of the sodium current through modified calcium channels is shifted to a negative side by 10-15 mV as compared with the calcium current through native channels.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Cell Mechanics Regulates the Dynamic Anisotropic Remodeling of Fibril Matrix at Large Scale.
Research (Wash D C)
November 2023
Institute of Biomedical Engineering and Health Sciences, School of Medical and Health Engineering and School of Pharmacy, Changzhou University, Changzhou, 213164, China.
Living tissues often have anisotropic and heterogeneous organizations, in which developmental processes are coordinated by cells and extracellular matrix modeling. Cells have the capability of modeling matrix in long distance; however, the biophysical mechanism is largely unknown. We investigated the dynamic remodeling of collagen I (COL) fibril matrix by cell contraction with designed patterns of cell clusters.
View Article and Find Full Text PDFNADPH oxidase derived ROS promote arterial contraction in early postnatal rats by activation of L-type voltage-gated Ca channels.
Free Radic Res
January 2025
Department of Human and Animal Physiology, Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, Russia.
Reactive oxygen species (ROS) produced by NADPH oxidase promote contraction of peripheral arteries, which is especially pronounced in early postnatal period in comparison to adulthood, but the mechanisms of such vasomotor influence are poorly understood. We tested the hypothesis that Rho-kinase and protein kinase C (PKC) mediate procontractile influence of NADPH oxidase derived ROS in peripheral artery of early postnatal rats. In addition, we evaluated the involvement Src-kinase and L-type voltage-gated Ca channels (LTCC) into procontractile influence of ROS, produced by NADPH oxidase, because of their known interplay with Rho-kinase and PKC pathways.
View Article and Find Full Text PDFThe role of rodent behavioral models of schizophrenia in the ongoing search for novel antipsychotics.
Expert Opin Drug Discov
January 2025
Centro de Investigación en Reproducción Animal, Universidad Autónoma de Tlaxcala - CINVESTAV Tlaxcala, Tlaxcala, México.
Introduction: Existing pharmacotherapies for schizophrenia have not progressed beyond targeting dopamine and serotonin neurotransmission. Rodent models of schizophrenia are a necessary tool for elucidating neuropathological processes and testing potential pharmacotherapies, but positive preclinical results in rodent models often do not translate to positive results in the clinic.
Areas Covered: The authors reviewed PubMed for studies that applied rodent behavioral models of schizophrenia to assess the antipsychotic potential of several novel pharmacotherapies currently under investigation.
The NMDAR-BK channelosomes as regulators of synaptic plasticity.
Biochem Soc Trans
January 2025
Departamento de Ciencias Médicas Básicas, Facultad de Ciencias de la Salud-sección Medicina, Universidad de La Laguna, Tenerife, ES-38071, Spain.
Large conductance voltage- and calcium-activated potassium channels (BK channels) are extensively found throughout the central nervous system and play a crucial role in various neuronal functions. These channels are activated by a combination of cell membrane depolarisation and an increase in intracellular calcium concentration, provided by calcium sources located close to BK. In 2001, Isaacson and Murphy first demonstrated the coupling of BK channels with N-methyl-D-aspartate receptors (NMDAR) in olfactory bulb neurons.
View Article and Find Full Text PDFFrom Atrial Small-conductance Calcium-activated Potassium Channels to New Antiarrhythmics.
Eur Cardiol
December 2024
Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen Copenhagen, Denmark.
Despite significant advances in its management, AF remains a major healthcare burden affecting millions of individuals. Rhythm control with antiarrhythmic drugs or catheter ablation has been shown to improve symptoms and outcomes in AF patients, but current treatment options have limited efficacy and/or significant side-effects. Novel mechanism-based approaches could potentially be more effective, enabling improved therapeutic strategies for managing AF.
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!