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Effect of histamine on leukocyte migration tests in vertebrates. II. Study of the lack of species specificity of leukocyte inhibiting factor--production inhibitor (LIF-PI).

Immune regulatory effects of histamine are now well established. We have previously demonstrated that human T lymphocytes having histamine receptors, produce a soluble factor inhibiting the production of LIF. In this present paper we have shown that production and function of this factor is not species specific. Indeed the leukocyte inhibiting factor-production inhibitor (LIF-PI) produced by human, guinea pig or dog lymphocytes inhibits the production of LIF by human, guinea pig and murine lymphocytes to a similar extent. This property allows for easier testing of LIF-PI particularly from human subjects.