IMMUNOSUPPRESSIVE EFFECT OF HUMAN PREGNANCY ZONE PROTEIN ON H‐2 INCOMPATIBLE MOUSE HEART ALLOGRAFT

Abstract
Human pregnancy zone protein (PZP) given i.v., significantly (P < 0.001) prolonged the survival of heterotopic A/J heart transplants in A.CA recipients, compared to untreated control recipients, recipients treated with phosphate buffered saline and recipients treated with a control preparation from male serum. Apparently PZP protein exerts an nonspecific immunosuppressive effect in vivo.