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Effects of thymectomy upon the formation of Fóa-Kurloff cells in the guinea pig.

The peculiar cytoplasmic inclusion body found in mononuclear cells of guinea pig blood and lymphoid tissues—the Foa-Kurloff body—is believed to play an undefined role in the humoral immune mechanism of that animal. On the ultrastructural level, similarities between such cells and plasmocytic cells have earlier been noted. In order to test an often postulated thymic origin of these cells and to evaluate the effects of an immunological ablation on their formation, thymectomy was carried out on guinea pigs subsequently subjected to repeated injections of oestrogen. The experiment demonstrated unequivocally that the presence in the guinea pig of thymic tissue has no influence on the rate of formation of Foa-Kurloff bodies in its tissues.