CXCR3 regulates CD4+ T cell cardiotropism in pressure overload-induced cardiac dysfunction

Area of Science:

• Cardiovascular Research
• Immunology
• Cell Biology

Background:

• Heart failure (HF) involves elevated CXCL9 and CXCL10, ligands for CXCR3 on CD4+ Th1 cells.
• Th1 cells contribute to adverse cardiac remodeling in pressure overload-induced cardiac dysfunction.
• T cell recruitment to the heart is crucial in cardiac dysfunction.

Purpose of the Study:

• Investigate the role of CXCR3+ T cells in pressure overload-induced cardiac dysfunction.
• Determine the mechanism of Th1 cell recruitment to the heart.
• Identify the source of chemokines driving T cell infiltration.

Main Methods:

• Studied CXCR3+ T cell infiltration in human and mouse hearts with pressure overload.
• Utilized genetic deletion of CXCR3 in mouse models.
• Assessed Th1 cell adhesion to ICAM-1 under shear conditions.
• Identified chemokine-producing cells in the heart.

Main Results:

• CXCR3+ T cells infiltrate the heart in pressure overload-induced cardiac dysfunction.
• Genetic deletion of CXCR3 inhibited CD4+ T cell heart infiltration and prevented adverse remodeling.
• Cardiac fibroblasts and myeloid cells (macrophages) produce CXCL9 and CXCL10.
• These chemokines promote Th1 cell adhesion to ICAM-1 via CXCR3.

Conclusions:

• CXCR3 plays a critical role in Th1 cell recruitment to the heart during pressure overload.
• CXCR3-mediated Th1 cell infiltration contributes to adverse cardiac remodeling in HF.
• Targeting the CXCR3 pathway may offer a therapeutic strategy for HF.