Cardiology

Endothelial Leakage Regulation by Tetraspanin-Enriched Membrane Domains

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Article Impact Level: HIGH
Data Quality: STRONG
Summary of Nature Cardiovascular Research https://doi.org/10.1038/s44161-025-00686-2 
Dr. Yingjun Ding et al.

Points

  • Tetraspanin CD82 promotes vascular inflammation and leakage by influencing endothelial cell signaling pathways.
  • CD82 limits the anchorage of specific GTPase regulators, which balances Cdc42 and RhoA activity.
  • The regulatory effects of CD82 depend on its ability to retain accessible cholesterol at the plasma membrane.
  • Simvastatin can reverse CD82’s effects by lowering accessible cholesterol, reducing vascular leakage.
  • This mechanism suggests a novel anti-inflammatory role for statins and potential new therapeutic targets.

Summary

This research elucidates a novel mechanism by which tetraspanin CD82 regulates vascular leakage and inflammation through its influence on plasma membrane (PM) cholesterol accessibility and the balance of antagonistic GTPases. Endothelial-specific ablation of CD82 was found to significantly reduce vascular inflammation by mitigating endothelial leakage. Mechanistically, CD82 limits the PM anchorage of Cdc42 activator FARP1 and RhoA inhibitor Rnd3, thereby confining Cdc42 activity while sustaining RhoA activity in endothelial cells, a balance that typically facilitates endothelium activation and vascular permeability.

The study further reveals that these signaling regulatory effects are contingent on CD82’s ability to coalesce and retain accessible cholesterol (AC) at the PM. Importantly, simvastatin, a known cholesterol-lowering agent, was observed to overturn the effects of CD82 by reducing AC levels. CD82 supports the non-vesicular transfer of AC to the PM via oxysterol-binding protein-related proteins (ORPs). This indicates a critical role for both CD82 and AC in promoting vascular leakage, while statins and ORP inhibitors exert restraining effects by decreasing AC.

These findings not only uncover an unconventional anti-inflammatory role and mechanism for statins but also conceptualize a tetraspanin-mediated, AC-dependent, and cholesterol transfer-mediated balancing of antagonistic GTPase signaling pathways as a key regulatory mechanism for vascular leakage. The data, including TMT proteomics (PRIDE accession PXD065001) and bulk RNA-seq (NCBI BioSample SAMN48951810), provide robust support for these conclusions, offering new therapeutic avenues for conditions involving vascular inflammation and leakage.

Link to the article:  https://www.nature.com/articles/s44161-025-00686-2 

References

Ding, Y., Chen, J., Liu, S., Hays, J. M., Gu, X., Wren, J. D., Georgescu, C., Reuter, D. N., Liu, B., He, F., Wang, X., Wei, Q., Wang, J., Subramaniyan, B., Wu, Z., Kodali, K., Reagan, A. M., Freeman, W. M., Miranti, C. K., … Zhang, X. A. (2025). Tetraspanin-enriched membrane domains regulate vascular leakage by altering membrane cholesterol accessibility to balance antagonistic GTPases. Nature Cardiovascular Research, 4(8), 1011–1033. https://doi.org/10.1038/s44161-025-00686-2

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