Blockade of the interaction between PD-1 and PD-L1 accelerates graft arterial disease in cardiac allografts

Arteriosclerosis, Thrombosis, and Vascular Biology
Noritaka KogaMitsuaki Isobe

Abstract

Programmed death-1 (PD-1), a member of the CD28 family, has been identified. PD-1 is involved in the negative regulation of some immune responses. We evaluated the role of PD-ligand 1 (PD-L1) in graft arterial disease (GAD) of cardiac allografts and in smooth muscle cells (SMCs). C57BL/6 murine hearts were transplanted into B6.C-H2<bm12>KhEg mice for examination of GAD. PD-L1 was expressed in SMCs of the thickened intima in the graft coronary arteries, and administration of anti-PD-L1 monoclonal antibody (mAb) enhanced the progression of GAD (luminal occlusion: 55+/-5.0% versus 9.8+/-4.3%, P<0.05). The expressions of interferon gamma (IFN-gamma) and tumor necrosis factor alpha of cardiac allografts were upregulated in response to anti-PD-L1 mAb treatment. In vitro, PD-L1 expression was induced in SMCs in response to IFN-gamma stimulation. Sensitized splenocytes increased SMC proliferation, and anti-PD-L1 mAb in combination with IFN-gamma stimulation increased this proliferation. The PD-L1 pathway regulates both the proliferation of SMCs and GAD. Thus, control of this interaction is a promising strategy for suppression of GAD.

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