Smooth muscle cell-specific CD47 deletion suppresses atherosclerosis

Area of Science:

• Vascular biology
• Immunology
• Cellular and Molecular Medicine

Background:

• Smooth muscle cell (SMC)-derived cells play a key role in atherosclerosis.
• Thrombospondin-1 (TSP1) and its receptor cluster of differentiation (CD) 47 are implicated in atherosclerosis.
• The specific role of vascular SMC TSP1-CD47 signaling in VSMC phenotype and atherogenesis is not well understood.

Purpose of the Study:

• To investigate the role of SMC CD47 activation by TSP1 in regulating VSMC phenotype.
• To determine the impact of SMC TSP1-CD47 signaling on atherosclerosis development.

Main Methods:

• In vitro cell-based assays and molecular biology techniques.
• Immunohistology, scRNA-seq data reanalysis, and cell-specific knockout mice.
• Investigated TSP1-CD47 interactions and their effects on VSMC markers and proliferation.

Main Results:

• TSP1 increased VSMC proliferation and decreased contractile markers; CD47 mediates these effects.
• SMC-specific Cd47 deletion in mice suppressed atherosclerosis, reduced necrotic areas, and decreased macrophage accumulation.
• CD47 knockdown in human VSMCs reversed TSP1-induced changes and enhanced efferocytosis of apoptotic VSMCs.

Conclusions:

• CD47 is a critical regulator of VSMC phenotype.
• Targeting SMC CD47 signaling is a promising therapeutic strategy to suppress atherosclerosis.
• SMC-specific Cd47 deletion attenuates atherosclerosis by modulating VSMC phenotype and improving efferocytosis.