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The effect of recombinant murine interferon-gamma on the growth of Chlamydia trachomatis was analyzed in a mouse fibroblast cell line (McCoy cells). Murine interferon-gamma had a very potent anti-chlamydial activity, although minimally affecting cellular proliferation. Over 95% inhibition of chlamydial inclusions was obtained at a concentration of 1 U/ml of interferon. At a concentration of 1 U/ml of murine interferon-gamma, there was minimal inhibition of the proliferative capacity of McCoy cells. Approximately 50% inhibition of cell growth was obtained with a concentration of 10 U/ml of interferon. Varying concentrations of tryptophan in the medium did not alter either the anti-chlamydial or the anti-proliferative activity of the interferon.
Maza et al. (1985) studied this question.