Lipid dynamics in the plasma membrane of fresh and cryopreserved human spermatozoa

被引:45
作者
James, PS
Wolfe, CA
Mackie, A
Ladha, S
Prentice, A
Jones, R [1 ]
机构
[1] Babraham Inst, Dept Signalling, Gamete Signalling Lab, Cambridge CB2 4AT, England
[2] Inst Food Res, Dept Food Biophys, Norwich NR4 7UA, Norfolk, England
[3] Univ Cambridge, Rosie Matern Hosp, Dept Obstet & Gynaecol, Cambridge CB2 2SW, England
关键词
D O I
10.1093/humrep/14.7.1827
中图分类号
R71 [妇产科学];
学科分类号
100211 ;
摘要
Preserving the integrity of the plasma membrane of spermatozoa is crucial for retention of their fertilizing capacity, especially after stressful procedures such as freezing and storage. In this investigation we have measured lipid diffusion in different regions of the plasma membrane of fresh and cryopreserved human spermatozoa using a sensitive, high resolution fluorescence photobleaching technique (FRAP) with 5-(N-octadecanyl);aminofluorescein as reporter probe. Results show that diffusion was significantly faster on the plasma membrane overlying the acrosome and decreased progressively in the postacrosome, midpiece and principal piece. The midpiece plasma contains a higher proportion of immobile lipids than other regions. In cryopreserved spermatozoa, lipid diffusion in the plasma membrane was significantly reduced on the acrosome, postacrosome and midpiece relative to fresh spermatozoa, Diffusion, however, could be restored to normal levels by washing spermatozoa in a medium containing 0.4% polyvinylpyrrolidine but not in medium alone or in medium containing 0.4% albumin. These results suggest that (i) lipid dynamics in the plasma membrane of human spermatozoa varies significantly between surface regions; (ii) inplane diffusion is adversely affected by cryopreservation; and (iii) washing frozen spermatozoa in 0.4% polyvinylpyrrolidine restores membrane lipid fluidity to normal levels. The latter finding has important implications for improving the fertility of human spermatozoa following cryopreservation.
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页码:1827 / 1832
页数:6
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