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Biology of Reproduction, Vol 23, 637-645, Copyright © 1980 by Society for the Study of Reproduction
1 School of Medicine and Department of Physiology,
Southern Illinois University,
Carbondale, Illinois 62901 Quantitative electron microscopy is used to provide new information regarding the purity and
the amounts of plasma membrane originating from various regions of the surface of the boar
spermatozoon when such membranes are prepared by nitrogen cavitation and sucrose density
centrifugation. These data show that the plasma membranes originate primarily from the head of
the spermatozoon; they also show that contamination of these plasma membranes by acrosomal
and mitochondrial membranes is negligible. Immunolocalization, using plasma membrane vesicles
and divalent IgG directed against plasma membrane antigens, shows that plasma membrane vesicles
bind extensively to intact sperm plasma membranes but rarely bind to the outer acrosomal membrane. These new data, taken together with that which has been previously reported, indicate that
high pressure gas cavitation provides a simple means for obtaining undamaged, highly purified
sperm plasma membranes.
Note:
ACKNOWLEDGMENTS
The use of the electron microscope facilities at the
Springfield campus of Southern Illinois University was
greatly appreciated. The excellent technical assistance
of Ms. Terri Russell, Mr. Ray Venezia, and Mr. S.
Usaha is acknowledged. This study was supported by
NIH Grant HD 10947.
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