Sakabe K, Okuma M, Kazuno M, Yamaguchi T, Yoshida T, Furuya H, Kayama F, Suwa Y, Fujii W, Fresa KL. Estrogenic xenobiotics affect the intracellular activation signal in mitogen-induced human peripheral blood lymphocytes: immunotoxicological impact.
INTERNATIONAL JOURNAL OF IMMUNOPHARMACOLOGY 1998;
20:205-12. [PMID:
9730256 DOI:
10.1016/s0192-0561(98)00030-7]
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Abstract
The present study was an attempt to elucidate the effect of estrogenic xenobiotics on the proliferation of mitogen-stimulated human peripheral blood lymphocyte (PBL). Our findings follow: (a) the proliferation of PBL in response to phytohemagglutinin (PHA) was mediated by protein kinase C activity, but estrogenic xenobiotics had a strong inhibitory effect on protein kinase C activity of PHA-stimulated PBL; (b) cytoplasmic extracts from PHA-stimulated PBL greatly activated DNA replication, but estrogenic xenobiotics had a strong inhibitory effect on these activities. The results suggest that the cytoplasmic signal-generating system in mitogen-treated PBL is inhibited by estrogenic xenobiotics, and that the defect occurs at all stages in the sequence of events leading to DNA synthesis and cell proliferation.
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