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Biology of Reproduction, Vol 21, 583-588, Copyright © 1979 by Society for the Study of Reproduction

Calcium Binding to Plasma Membrane Vesicles of Boar Spermatozoa

R. N. PETERSON 1, LONNIE RUSSELL 1, D. BUNDMAN 1, , and MATHEW FREUND 1

1 School of Medicine and Department of Physiology, Southern Illinois University, Carbondale, Illinois 62901


Purified plasma membrane vesicles from boar spermatozoa are shown to bind radioactive calcium with high affinity. Calcium binding to high affinity sites is enhanced by Na+ or K+. Binding is also markedly stimulated by low concentration of La+3 and Ho+3 but not by other large electrophilic cations. Increased calcium uptake in the presence of La+3 appears to be due to exposure of more binding sites deep within the plasma membrane vesicles. High concentrations of La+3 block calcium access to these sites. The ability of these vesicles to bind high concentrations of calcium suggests that the plasma membrane may play an important role in the storage and release of calcium in intact spermatozoa.

Note:
ACKNOWLEDGMENTS This work was supported by grant HD 10947 from NIH.

Submitted on March 14, 1979
Accepted on May 23, 1979






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Copyright © 1979 by the Society for the Study of Reproduction.