Cargando…
The Influence of High Potassium Depolarization and Acetylcholine on Calcium Exchange in the Rat Uterus
Net and radioactive calcium movements were studied in the rat uterus during stimulation with acetylcholine and high potassium solutions. High potassium did not affect the efflux of intracellular Ca(45), but was able to release Ca(45) from a small parallel Ca fraction which was believed to be located...
Autores principales: | , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Rockefeller University Press
1966
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3328327/ https://www.ncbi.nlm.nih.gov/pubmed/5924112 http://dx.doi.org/10.1085/jgp.0491299 |
_version_ | 1782229724247883776 |
---|---|
author | van BREEMEN, CASEY DANIEL, E. E. |
author_facet | van BREEMEN, CASEY DANIEL, E. E. |
author_sort | van BREEMEN, CASEY |
collection | PubMed |
description | Net and radioactive calcium movements were studied in the rat uterus during stimulation with acetylcholine and high potassium solutions. High potassium did not affect the efflux of intracellular Ca(45), but was able to release Ca(45) from a small parallel Ca fraction which was believed to be located in the cell membranes. High potassium did markedly slow the influx of Ca(45) and caused a net calcium efflux. Acetylcholine had no effect on calcium movements in polarized myometrium, but it increased the Ca(45) influx in depolarized uteri. Ca(45) taken up during contraction exchanged more slowly during subsequent efflux than Ca(45) taken up at rest. The results were interpreted as supporting the hypothesis that myometrial contraction is induced by a release of calcium from the inside of the cell membrane and the endoplasmic reticulum, and relaxation follows the removal of ionic cytoplasmic calcium by these same structures. |
format | Online Article Text |
id | pubmed-3328327 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 1966 |
publisher | The Rockefeller University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-33283272012-04-23 The Influence of High Potassium Depolarization and Acetylcholine on Calcium Exchange in the Rat Uterus van BREEMEN, CASEY DANIEL, E. E. J Gen Physiol Articles Net and radioactive calcium movements were studied in the rat uterus during stimulation with acetylcholine and high potassium solutions. High potassium did not affect the efflux of intracellular Ca(45), but was able to release Ca(45) from a small parallel Ca fraction which was believed to be located in the cell membranes. High potassium did markedly slow the influx of Ca(45) and caused a net calcium efflux. Acetylcholine had no effect on calcium movements in polarized myometrium, but it increased the Ca(45) influx in depolarized uteri. Ca(45) taken up during contraction exchanged more slowly during subsequent efflux than Ca(45) taken up at rest. The results were interpreted as supporting the hypothesis that myometrial contraction is induced by a release of calcium from the inside of the cell membrane and the endoplasmic reticulum, and relaxation follows the removal of ionic cytoplasmic calcium by these same structures. The Rockefeller University Press 1966-07-01 /pmc/articles/PMC3328327/ /pubmed/5924112 http://dx.doi.org/10.1085/jgp.0491299 Text en © 1966 Chowdhury and Chanda This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/). |
spellingShingle | Articles van BREEMEN, CASEY DANIEL, E. E. The Influence of High Potassium Depolarization and Acetylcholine on Calcium Exchange in the Rat Uterus |
title | The Influence of High Potassium Depolarization and Acetylcholine on Calcium
Exchange in the Rat Uterus |
title_full | The Influence of High Potassium Depolarization and Acetylcholine on Calcium
Exchange in the Rat Uterus |
title_fullStr | The Influence of High Potassium Depolarization and Acetylcholine on Calcium
Exchange in the Rat Uterus |
title_full_unstemmed | The Influence of High Potassium Depolarization and Acetylcholine on Calcium
Exchange in the Rat Uterus |
title_short | The Influence of High Potassium Depolarization and Acetylcholine on Calcium
Exchange in the Rat Uterus |
title_sort | influence of high potassium depolarization and acetylcholine on calcium
exchange in the rat uterus |
topic | Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3328327/ https://www.ncbi.nlm.nih.gov/pubmed/5924112 http://dx.doi.org/10.1085/jgp.0491299 |
work_keys_str_mv | AT vanbreemencasey theinfluenceofhighpotassiumdepolarizationandacetylcholineoncalciumexchangeintheratuterus AT danielee theinfluenceofhighpotassiumdepolarizationandacetylcholineoncalciumexchangeintheratuterus AT vanbreemencasey influenceofhighpotassiumdepolarizationandacetylcholineoncalciumexchangeintheratuterus AT danielee influenceofhighpotassiumdepolarizationandacetylcholineoncalciumexchangeintheratuterus |