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CD37 Impairs Revascularization and Muscle Recovery in Peripheral Artery Disease

ABSTRACT: Peripheral artery disease (PAD) affects >14 million Americans, and its most severe form, critical limb-threatening ischemia (CLTI), is marked by persistent inflammation and failure of durable skeletal muscle repair. Tetraspanins organize immune receptor signaling and leukocyte trafficking, but their roles in CLTI remain incompletely defined. Here, we focused on the leukocyte tetraspanin CD37 prompted by transcriptomic evidence of CD37 upregulation in human PAD gastrocnemius muscle.

ORGANISM(S): Mus musculus

PROVIDER: GSE319430 | GEO | 2026/08/19

REPOSITORIES: GEO

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Project description:Background Peripheral artery disease (PAD) is caused by atherosclerosis and chronic narrowing of lower limb arteries leading to decreased muscle perfusion and oxygenation. Current guidelines for treating PAD include endovascular strategies or bypass surgery but long-term outcomes have been suboptimal. This is likely due to our limited understanding of the contribution of the microvasculature as well as other cell types, in particular macrophages, to PAD skeletal muscle pathophysiology. We used single cell sequencing to investigate cellular and transcriptional heterogeneity of the skeletal muscle microenvironment in PAD. Methods Samples from the medial head of the gastrocnemius muscle of individuals undergoing either lower limb aneurysm surgery (controls) or PAD bypass surgery (PAD) were collected. Samples were either frozen for histological evaluation (control: n=4; PAD: n=6) or were immediately processed for single cell RNA sequencing of mononuclear cells (control: n=4; PAD: n= 4). Bioinformatic tools were used to annotate cell types and their subpopulations, to study transcriptional changes and to analyze cellular interactions. Results We generated a dataset comprised of 106,566 high-quality, deep-sequenced cells that compose the muscle microenvironment. Focusing on endothelial cells (ECs) and macrophages, we confirmed the presence of ATF3/4+ ECs with angiogenic and immune regulatory capacities in human muscle and found that their transcriptional profile profoundly alters during PAD. Also, capillary ECs display features of endothelial to mesenchymal transition. Furthermore, we identified LYVE1hiMHCIIlow resident macrophages as the dominant macrophage population in human muscle, even under a chronic inflammatory condition such as PAD. During PAD, LYVE1hiMHCIIlow macrophages get activated and acquire a more pro-inflammatory profile. Finally, we map strong intercellular communication in the muscle microenvironment, which is significantly altered in PAD. Conclusions The dataset we present here provides a highly valuable resource for gaining deeper insights into the critical roles that cells in the muscle microenvironment may play in PAD skeletal muscle pathology. We propose that targeting the crosstalk between ECs and macrophages could provide novel insights for developing effective treatments against this disease.

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CD37 Impairs Revascularization and Muscle Recovery in Peripheral Artery Disease

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