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Effects of diethylstilbestrol on Propionibacterium acnes immunomodulation: inhibition of macrophage activation and antitumor activity.

Exposure of mice to diethylstilbestrol (DES) inhibited Propionibacterium acnes-induced antitumor activity in vivo against the B16F10 subcutaneous tumor. The inhibitory effect was associated with inhibition by DES of the characteristic P. acnes induced splenomegaly and changes in splenic and peritoneal macrophages (M phi) cell populations. The characteristic P. acnes induced reductions in M phi alkaline phosphodiesterase I (APD) ectoenzyme activity and in total RNA synthesis, proposed biochemical markers of tumoricidal M phi, were partially or completely reversed in DES-treated mice. As predicted from these in vivo and in vitro results, DES treatment significantly decreased P. acnes activation of M phi antitumor activity in vitro against B16F10 melanoma and Lewis lung carcinoma cells. These data suggest a macrophage activation defect may be involved in the reduced resistance that DES-treated animals exhibit to a variety of neoplastic and microbial challenges.[1]

References

  1. Effects of diethylstilbestrol on Propionibacterium acnes immunomodulation: inhibition of macrophage activation and antitumor activity. Ackermann, M.F., Mark, R., Chakraborty, P.R., Morahan, P.S. J. Leukoc. Biol. (1986) [Pubmed]
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