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Lymphocyte Activation by the Tumor-Promoting Agent 12-O-Tetradecanoylphorbol-13-Acetate (TPA)¹

From the Max von Pettenkofer Institute of Hygiene and Medical Microbiology, Pettenkoferstrasse 9a, D-8000 Munich 2, Federal Republic of Germany

Abstract

TPA, a highly active tumor-promoting agent, is an effective mitogen for primate peripheral blood lymphocytes. Optimal stimulation of human lymphocytes was obtained 4 days after the addition of TPA at a concentration of 7.5 ng/ml. Lymphocyte fractionation experiments demonstrated that both T and B cells incorporated ³H-thymidine significantly in response to TPA. Lymphocyte blastogenesis was not due to the reactivation of latent herpesviruses by the tumor promoter, since similar responses to TPA were obtained with virus-genome positive or negative cells. Increased levels of DNA synthesis were observed when TPA was added to marmoset, baboon, rhesus monkey, or chimpanzee peripheral blood lymphocytes. Canine peripheral blood lymphocytes and spleen cells from guinea pigs, rats, and mice were not stimulated by TPA. These observations suggest that TPA-induced lymphocyte blastogenesis may be useful for studies of lymphocyte activation and of the molecular mechanisms of action of tumor-promoting phorbol esters.

Footnotes

¹ This work has been supported by Deutsche Forschungsgemeinschaft, SFB 37, G 7, and Wo. 227/2.

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