Nonspecific Immunopotentiators and Pregnancy Loss: Complete Freund Adjuvant Reverses High Fetal Resorption Rate in CBA × DBA/2 Mouse Combination

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Abstract
CBA/J female mice mated with DBA/ 2J males show a high incidence of fetal resorptions. This paper presents data demonstrating that nonspecific immunopotentiation by complete Freund adjuvant (CFA) reversed pregnancy loss in CBA/J mothers. Immunization of more than 70 CBA/J females mated with DBA/2J males with CFA reduced the incidence of fetal resorption from 27.3 ± 1.9 to 7.9 ± 1.5%. The injection of Thymus Humoral Factor known to be a potent T cell stimulator did not reduce the number of fetal resportions. The route of CFA distribution was found to be important—only foot pad injections were effective in fetal protection, whereas i.p. treatment did not reduce fetal resorptions. Fetal protection could be transferred by splenocytes of CFA‐injected CBA/J mothers (9.6 ± 5.0% fetal resorptions). Sera from treated CBA/J mice could not cause such an effect (17.6 ± 4.6 vs. 21.3 ± 6.1 in control animals). Thus, stimulation of the maternal immune system by nonspecific immunopotentiators can improve reproductive performance of this mouse combination which has an increased rate of pregnancy loss. Possible mechanisms of this fetal protection are discussed.