Myeloid CCR2 Promotes Atherosclerosis after AKI

Area of Science:

• Cardiovascular Research
• Renal Medicine
• Immunology

Background:

• Acute kidney injury (AKI) increases cardiovascular event risk.
• Leukocytes contribute to atherosclerotic plaque progression and instability.
• A model was developed to study remote atherosclerosis following renal ischemia-reperfusion (IR) injury.

Purpose of the Study:

• Investigate inflammatory mechanisms driving remote atherosclerosis after renal IR injury.
• Identify specific cellular and molecular pathways linking kidney injury to cardiovascular disease.

Main Methods:

• Utilized LDL receptor-deficient mice undergoing unilateral renal IR injury.
• Employed histology, flow cytometry, and gene expression analysis to assess aortic lesions and inflammation.
• Performed single-cell analysis to identify renal cell-derived mediators and their role in myeloid cell recruitment.

Main Results:

• Renal IR injury significantly increased aortic root atherosclerotic lesion size.
• Chemokines and T cell-associated genes were upregulated in aortas post-IR.
• Myeloid cell CCR2 signaling was identified as crucial, with CCL2 mediating myeloid cell homing.
• Bone marrow reconstitution with Ccr2 deficiency abrogated excess plaque formation.

Conclusions:

• Established an experimental model for remote proatherogenic effects of renal IR.
• Demonstrated that myeloid CCR2 signaling is a mechanistic requirement for this process.
• Highlighted monocytes as key mediators of systemic vascular complications following kidney injury.