Blocking PD-L1-PD-1 improves senescence surveillance and ageing phenotypes

Area of Science:

• Immunology
• Cell Biology
• Gerontology

Background:

• Cellular senescence contributes to age-related diseases and inflammation.
• The molecular mechanisms driving senescent cell accumulation remain largely unknown.
• Senescent cells exhibit a senescence-associated secretory phenotype (SASP).

Purpose of the Study:

• To investigate the role of immune checkpoint proteins in senescent cell accumulation.
• To explore programmed death-ligand 1 (PD-L1) as a target for anti-aging strategies.

Main Methods:

• Single-cell analysis of p16+ cells in vivo.
• Administration of programmed cell death protein 1 (PD-1) antibody in aging mice and models of liver disease.
• Assessment of T cell surveillance and SASP levels.

Main Results:

• Senescent cells heterogeneously express PD-L1, with PD-L1+ cells resisting T cell surveillance.
• PD-L1 expression on senescent cells correlates with higher SASP levels.
• PD-1 antibody treatment reduced senescent cell burden and ameliorated aging phenotypes in mice.

Conclusions:

• Heterogeneous PD-L1 expression is crucial for senescent cell accumulation and age-related inflammation.
• Eliminating PD-L1+ senescent cells via immune checkpoint blockade shows promise for anti-aging therapies.