Journal of Andrology Free Medline Services
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Purohit, S. B.
Right arrow Articles by Kumar, P. G.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Purohit, S. B.
Right arrow Articles by Kumar, P. G.

Journal of Andrology, Vol 19, Issue 5 608-618, Copyright © 1998 by The American Society of Andrology

JOURNAL ARTICLE

Bicarbonate-dependent lipid ordering and protein aggregation are part of the nongenomic action of progesterone on capacitated spermatozoa

S. B. Purohit, M. Laloraya and P. G. Kumar
School of Life Sciences, Devi Ahilya University, Indore, India. kumarp@bom4.vsnl.net.in

The nongenomic action of progesterone (P) on capacitated sperm in mediating acrosomal exocytosis operates through transmembrane signal transduction involving increased intracellular calcium ions and modulation of protein kinases and phospholipid metabolism through a second messenger pathway. Conflicting views exist regarding the nature of the nongenomic receptor of P. It is thought to be a cell-surface receptor having the properties of a calcium channel, chloride channel, bicarbonate/chloride exchanger, and gamma aminobutyric acid type A (GABA(A)). In this study, we tried to understand the role of bicarbonate and/or P in inducing membrane perturbations in capacitated and acrosome-reacting spermatozoa. We also attempted to characterize the membrane responses in P-stimulated and bicuculline-poisoned sperm. The presence of a high level of bicarbonate in the medium favored high rotational mobility of lipids and proteins in capacitated sperm. However, the capacitated sperm exhibited low lipid ordering and unaltered protein ordering in response to the high bicarbonate concentration. P and bicuculline appeared to bind to the same or similar binding sites, probably a GABA(A) receptor, eliciting similar motional perturbations in sperm membranes. It appears that both P and bicuculline can induce receptor aggregation and lipid ordering in sperm membranes, which alter the capability of sperm to bind zona pellucida, and that the P action on sperm takes effect through a bicarbonate-dependent signal transduction mechanism.


This article has been cited by other articles:


Home page
 Exp. Biol. Med.Home page
C. S. Watson and B. Gametchu
Proteins of Multiple Classes May Participate in Nongenomic Steroid Actions
Experimental Biology and Medicine, December 1, 2003; 228(11): 1272 - 1281.
[Abstract] [Full Text] [PDF]

Home page
 Physiol. Rev.Home page
R. M. LOSEL, E. FALKENSTEIN, M. FEURING, A. SCHULTZ, H.-C. TILLMANN, K. ROSSOL-HASEROTH, and M. WEHLING
Nongenomic Steroid Action: Controversies, Questions, and Answers
Physiol Rev, July 1, 2003; 83(3): 965 - 1016.
[Abstract] [Full Text] [PDF]

Home page
 Pharmacol. Rev.Home page
E. Falkenstein, H.-C. Tillmann, M. Christ, M. Feuring, and M. Wehling
Multiple Actions of Steroid Hormones---A Focus on Rapid, Nongenomic Effects
Pharmacol. Rev., December 1, 2000; 52(4): 513 - 556.
[Abstract] [Full Text] [PDF]

Home page
 Biol. Reprod.Home page
C. Patrat, C. Serres, and P. Jouannet
Induction of a Sodium Ion Influx by Progesterone in Human Spermatozoa1
Biol Reprod, May 1, 2000; 62(5): 1380 - 1386.
[Abstract] [Full Text]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1998 by The American Society of Andrology.