J. Membrane Biol. 165, 1–10 (1998) The Journal of Membrane Biology © Springer-Verlag New York Inc. 1998 Topical Review Lipid Heterogeneity and Membrane Fluidity in a Highly Polarized Cell, the Mammalian Spermatozoon S. Ladha Institute of Food Research, Norwich Research Park, Colney, Norwich, UK, NR4 7UA Received: 17 November 1997/Revised: 9 February 1998 Introduction envelope and the plasma membrane. It consists of an inner and outer membrane, which in the equatorial re- gion, form a stable parallel arrangement. During the ac- The mammalian spermatozoon is a highly polarized cell consisting of two main sections, the head and the tail. rosome reaction enzymes are released from this vesicle. These sections are enclosed by a differentiated plasma The outer acrosomal membane fuses with the overlaying membrane to give five specialized regions: acrosome plasma membrane of the anterior head region. The hy- (AC), equatorial region (EQ), postacrosome (PA), mid- brid membrane is shed, before the spermatozoon can piece (MP) and the principle piece (PP) (Fig. 1) (Bedford penetrate the egg. The inner membrane and the equato- & Hoskins, 1990). Each region has a specialized func- rial region of the acrosome remain intact after comple- tion; its associated membrane has a lipid and
The Journal of Membrane Biology – Springer Journals
Published: Sep 1, 1998
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