Add time:08/12/2019         Source:sciencedirect.com

Serine proteases are involved in a wide variety of seemingly unrelated physiological functions including capacitation of the spermatozoa and potentiation of human immunodeficiency virus (HIV) infection. The experimental vaginal contraceptives derived from 4-guanidinobenzoic acid act through inhibition of acrosin—a serine protease from the sperm. The serial ten-fold dilutions of 4′-acetamidophenyl 4-guanidinobenzoate (AGB) were tested in vitro for the effect against HIV infection by assaying the suppression of the novo p24 synthesis in virus-inoculated MT-4 T lymphocytes. The results reveal that complete inhibition of HIV occurred at 100 μg/ml—a dose corresponding to previously reported concentrations responsible for preventing fertilization in rabbits. These findings suggest that serine protease inhibitors and in particular the guanidinobenzoates, reported to be up to 100-fold more potent and less irritating than nonoxynol-9, can be potentially operative against sexual transmission of HIV.

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