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Keywords:

  • Resorption;
  • progesterone;
  • NK activity;
  • interferon

ABSTRACT: Transfer of spleen cells from poly (I)-poly(C12U)-treated Balb/c mice to 6.5-days-preg-nant Balb/c mice significantly increased the resorption rate (P<0.01) from 11% to 48%. The supernatant of progesterone-treated spleen cells from pregnant C3H mice abrogated the effect of spleen cell transfer. We conclude that by blocking NK activity in vivo, the progesterone-induced blocking factor favors the maintenance of pregnancy.