Effect of prostaglandins E2 and F2α on membrane calcium binding, Ca2+/Mg2+-ATPase activity and membrane fluidity in rat myometrial plasma membranes

Author:

Deliconstantinos G.,Fotiou S.

Abstract

ABSTRACT Myometrial plasma membrane (MPM) preparations from rats treated with oestradiol were obtained by discontinuous sucrose-gradient centrifugation. The preparations contained calcium-stimulated and magnesium-dependent ATPase (Ca2+/Mg2+-ATPase). A dramatic decrease in the activity of Ca2+/Mg2+-ATPase was observed when preparations were treated with 0·025–10μmol protaglandins E2 and F (PGE2 and PGF)/l. In contrast, there was a marked increase in MPM-bound 5′-nucleotidase activity at low concentrations (up to 2 μmol/l) of PGE2 and PGF; higher concentrations (up to 10 μmol/l), however, led to a progressive inhibition of enzyme activity. Association (specific and non-specific binding) of PGE2 and PGF with MPM at pH 7 was found to require Ca2+ (half-maximal concentration approximately 0·7 mmol/l). Changes in the allosteric properties of MPM-bound 5′-nucleotidase by concanavalin A (as reflected by changes in the Hill coefficient) indicated a fluidization of the membrane induced by PGE2 and PGF. The steady-state fluorescence anisotropy of 1,6-diphenyl-1,3,5-hexatriene-labelled MPM decreased in PGE2- and PGF-treated MPM from 1·24 ± 0·04 (s.d.) to 0·66 ± 0·01 and 0·74 ± 0·01 respectively, which is consistent with a general increase in membrane fluidity. It is suggested that PGE2 and PGF promote changes in the physical properties of MPM which may be relevant to the induction of uterine contractions by enzymatic regulation of intracellular calcium concentrations. J. Endocr. (1986) 110, 395–404

Publisher

Bioscientifica

Subject

Endocrinology,Endocrinology, Diabetes and Metabolism

Cited by 18 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Mechanisms of normal labour;Current Opinion in Physiology;2020-02

2. Regulation of Myometrial Smooth Muscle Functions;Current Pharmaceutical Design;2004-08-01

3. Prostaglandins and the myometrium and cervix;Prostaglandins, Leukotrienes and Essential Fatty Acids;2004-02

4. Direct regulation of human myometrial contractions by human chorionic gonadotropin;Journal of Clinical Endocrinology & Metabolism;1994-12-01

5. Ca2+ EXTRUSION ACROSS PLASMA MEMBRANE AND Ca2+ UPTAKE BY INTRACELLULAR STORES;Intracellular Messengers;1993

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3