The effect of bradykinin on germ cell proliferation was studied by using in vitro organ cultures of testicular fragments from 3.5- and 4.5-day-old rats in the presence of 3H-thymidine. Bradykinin in tested concentrations of 10(-8), 10(-6) and 10(-4) M manifested a significant stimulation of rat prespermatogonial cell proliferation. The percentage of labeled germ cells increased up to 3-fold in comparison with the control value especially in 3.5-day-old rat testicular explants. Two kininase inhibitors: phosphoramidon and captopril were also used in combination with bradykinin. The percentage of labeled germ cells was slightly increased as compared to the samples treated with bradykinin only. Experiments with two agonists and two antagonists of B1 and B2 receptors for kinins showed that the rat prespermatogonial cell proliferation response to bradykinin is probably mediated via B2 receptors. The present findings suggest that bradykinin may be an important local testicular factor with paracrine or autocrine role in the regulation of spermatogonial cell proliferation and germ cell number.
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