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Myeloid-specific Exoc5 deficiency develops renal inflammation and hypertension.

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Summary

Exoc5 deficiency in macrophages promotes kidney inflammation and hypertension by impairing exosome release and accumulating formin1, leading to enhanced cell migration. This study identifies Exoc5 as a key regulator in hypertension pathogenesis.

Keywords:
Bone marrow-derived myeloid cellsExoc5ExocytosisFormin1HypertensionInflammation

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Area of Science:

  • Cell Biology
  • Physiology
  • Immunology

Background:

  • Macrophage infiltration into the kidney contributes to inflammation and hypertension.
  • The exocyst complex regulates cell migration and exocytosis, but its role in macrophage infiltration is unclear.

Purpose of the Study:

  • To investigate the pathophysiological role of Exoc5, an exocyst component, in hypertension development.
  • To elucidate the mechanism by which Exoc5 influences macrophage migration and kidney inflammation.

Main Methods:

  • Utilized myeloid-specific Exoc5-deficient (LysM-Exoc5 KO) mice and bone marrow-derived macrophages (BMDM).
  • Analyzed blood pressure, kidney macrophage infiltration, inflammatory markers, and exosome release.
  • Investigated the role of formin1 and Rac1 in Exoc5-deficient macrophage migration using inhibitors and gene silencing in Raw264.7 cells.

Main Results:

  • LysM-Exoc5 KO mice exhibited elevated blood pressure, increased kidney macrophage infiltration, and heightened inflammatory markers.
  • Exoc5-deficient BMDM showed reduced exosome release, intracellular formin1 accumulation, and enhanced migration, which was reversed by formin1 inhibition.
  • Exoc5 downregulation in Raw264.7 cells mimicked the phenotype, and these cells induced inflammation and increased blood pressure when injected into mice.

Conclusions:

  • Exoc5 plays a critical role in regulating macrophage exocytosis and migration, contributing to inflammation and hypertension.
  • Exoc5-mediated selective exocytosis of formin1 is a key mechanism in hypertension pathogenesis.
  • Exoc5 and formin1 represent potential therapeutic targets for hypertension.