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Shedding off specific lipid constituents from sperm cell membrane during cryopreservation

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Title	Shedding off specific lipid constituents from sperm cell membrane during cryopreservation

Creator	Chakrabarty, J Banerjee, D Pal, D De, J Ghosh, A Majumder, GC

Subject	Biology; Physiology

Description	Membrane damage is one of the main reasons for reduced motility and fertility of sperm cells during cryopreservation. Using a model system of sperm cryopreservation developed in our laboratory, we have investigated the detailed changes due to cryopreservation in the plasma membrane lipid composition of the goat epididymal sperm cells. Total lipid and its components, i.e., neutral lipids, glycolipids and phospholipids decreased significantly after cryopreservation. Among neutral lipids sterols, steryl esters and 1-O-alkyl-2,3-diacyl glycerols decreased appreciably, while among phospholipids, major loss was observed for phosphatidyl choline and phosphatidyl ethanolamine. Unsaturated fatty acids bound to the phospholipids diminished while the percentage of saturated acids increased. The cholesterol:phospholipid ratio enhanced and the amount of hydrocarbon, which was unusually high, increased further on cryopreservation. The data indicates that profound increase of the hydrophobicity of the cell membrane is one of the major mechanisms by which spermatozoa acquire potential to resist or combat stress factors like cryodamage. The results are compatible with the view that for survival against cryodamage, sperm cells modulate the structure of their outer membrane by shedding off preferentially some hydrophilic lipid constituents of the cell membrane. (c) 2006 Elsevier Inc. All rights reserved.

Publisher	ACADEMIC PRESS INC ELSEVIER SCIENCESAN DIEGO525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA

Date	2011-09-20T12:12:38Z 2011-09-20T12:12:38Z 2007

Type	Article

Identifier	CRYOBIOLOGY 0011-2240 http://hdl.handle.net/123456789/14359

Language	English