Effects of combined treatment with PD‑L1 Ig and CD40L mAb on immune tolerance in the CBA/J x DBA/2 mouse model.

The embryo is a natural allograft and is the only exception to immune rejection, which reflects maternal immune tolerance towards the embryo. However, pregnancy loss is primarily caused by maternal immune rejection of the embryo. The aim of the present study was to explore the effects of combined treatment of programmed death‑ligand 1 (PD‑L1) immunoglobulin (Ig) and CD40‑ligand (CD40L) monoclonal antibody (mAb) on immune tolerance in an abortion‑prone mating model.