In order to study the abnormal differentiation and proliferation of precursor T cells in homosexual men, a study was made of T-cell colony formation in 15 healthy homosexual men without anti-human immunodeficiency virus (HIV) antibody. The colony forming method used was the one-step monolayer technique using phytohemagglutinin as an inducer. Our results revealed that colony formation was extremely reduced and 3 cases showed no colony growth. However, with the addition of recombinant interleukin 2 to the culture system, the number of colonies increased up to the same level as in heterosexual controls. In addition, the analysis of CD3+, 4+, and 8+ cells of colony component cells revealed a decrease in CD3+ and 4+ cells. However, with the addition of recombinant interleukin 2, the numbers of CD3+ cells distinctly increased. The above results suggest that a disorder in the differentiation and proliferation of precursor T cells in homosexual men might be one of the causes of immunodeficiency.

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