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1 Department of Obstetrics and
Gynecology, Vanderbilt School of
Medicine, Nashville, Tennessee
A study in vitro of interactions between uncapacitated rat spermatozoa and freshly ovulated rat oocytes
showed that testicular spermatozoa were unable to
adhere to the zona pellucida. On the other hand, spermatozoa from the cauda epididymidis adhered readily
to the zona surface. Experiments with cauda spermatozoa, immobilized by a preincubation at 0 C, indicated
that they were still able to attach to the zona pellucida,
suggesting that the inability of testicular spermatozoa
to interact with the zona was not primarily due to their
lack of motility but rather to a defect in adhesive properties of the plasma membrane. Preincubation of testicular spermatozoa, with a purified glycoprotein secreted by the epididymis (PES), increased somewhat
the ability of testicular spermatozoa to interact with the
zona surface. These results show that epididymal
spermatozoa acquire the ability to recognize and interact with the zona pellucida as they pass through the
epididymis, and suggest that sperm coating with an
androgen-dependent and specific glycoprotein, secreted by the epididymis, may regulate the initial contact with the egg investments.
Key words: sperm, epididymis, egg, binding, rat
Accepted on June 2, 1982
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