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The fate of sperm after vasectomy in the guinea pig: fine structure, freeze-fracture, and cytochemistry.

Ultrastructure freeze-fracture replicas lanthanum exclusion acid phosphatase and arylsulfatase were examined in unilaterally or bilaterally vasectomized guinea pigs up to 175 days after operation. The 1st alterations in vas deferens luminal contents or epididymis were convolutions in the cauda epididymis and vas before granuloma developed evident grossly and loss of typical "quilt" pattern of sperm plasma membrane and clustering of particles near the mitochondria seen in freeze fractures. Up to 30 days all sperm appeared normal; after 30 days sperm in the proximal vas and cauda epididymis began to lose their acrosomes and their typical stacking pattern. At 90 days macrophages began phagocytosing sperm and later polymorphonuclear leukocytes ingested only sperm without acrosomes and then they were only partially degranulated. The number of ridges in tight junctions seemed to increase but no breakdown was evident in lanthanum flow tests. The observations indicated that initial sperm degradation is due to the spermatozoas own autolytic enzymes that later dissolution takes place in macrophages in sperm granuloma that no sperm fragments occurred in or between epithelial cells and that no immunologic process was involved.