Localization of Low-density Detergent-resistant Membrane Proteins in Intact and Acrosome-reacted Mouse Sperm

Overview

Journal Biol Reprod

Publisher Oxford University Press

Specialty Reproductive Medicine

Date 2009 Jan 16

PMID 19144954

Citations 27

Authors

Patricia V Miranda

Alicia Allaire

Julian Sosnik

Pablo E Visconti

Affiliations

Soon will be listed here.

Abstract

Mammalian sperm become fertile after completing capacitation, a process associated with cholesterol loss and changes in the biophysical properties of the sperm membranes that prepares the sperm to undergo the acrosome reaction. Different laboratories have hypothesized that cholesterol efflux can influence the extent and/or movement of lipid raft microdomains. In a previous study, our laboratory investigated the identity of sperm proteins putatively associated with rafts. After extraction with Triton X-100 and ultracentrifugation in sucrose gradients, proteins distributing to the light buoyant-density fractions were cored from polyacrylamide gels and microsequenced. In this study, a subset of these proteins (TEX101, basigin, hexokinase 1, facilitated glucose transporter 3, IZUMO, and SPAM1) and other molecules known to be enriched in membrane rafts (caveolin 2, flotillin 1, flotillin 2, and the ganglioside GM3) were selected to investigate their localization in the sperm and their behavior during capacitation and the acrosome reaction. These molecules localize to multiple sperm domains, including the acrosomal cap (IZUMO, caveolin 2, and flotillin 2), equatorial segment (GM3), cytoplasmic droplet (TEX101), midpiece (basigin, facilitated glucose transporter 3, and flotillin 2), and principal piece (facilitated glucose transporter 3). Some of these markers modified their immunofluorescence pattern after sperm incubation under capacitating conditions, and these changes correlated with the occurrence of the acrosome reaction. While GM3 and caveolin 2 were not detected after the acrosome reaction, flotillin 2 was found in the equatorial segment of acrosome-reacted sperm, and IZUMO distributed along the sperm head, reaching the post- and para-acrosomal areas. Taking into consideration the requirement of the acrosome reaction for sperm to become fusogenic, these results suggest that membrane raft dynamics may have a role in sperm-egg membrane interaction.

Citing Articles

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