Cell Reports (Jul 2024)

Macrophages preserve endothelial cell specialization in the adrenal gland to modulate aldosterone secretion and blood pressure

  • Zheng Fan,
  • Mara Karakone,
  • Shunmugam Nagarajan,
  • Nadine Nagy,
  • Wiebke Mildenberger,
  • Ekaterina Petrova,
  • Laura Catharina Hinte,
  • Mitchell Bijnen,
  • Philipp Häne,
  • Eric Nelius,
  • Jing Chen,
  • Irina Ferapontova,
  • Ferdinand von Meyenn,
  • Francesco Trepiccione,
  • Mesut Berber,
  • David Penton Ribas,
  • Anne Eichmann,
  • Maria-Christina Zennaro,
  • Norihiko Takeda,
  • Jens W. Fischer,
  • Ariadni Spyroglou,
  • Martin Reincke,
  • Felix Beuschlein,
  • Johannes Loffing,
  • Melanie Greter,
  • Christian Stockmann

Journal volume & issue
Vol. 43, no. 7
p. 114395

Abstract

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Summary: Macrophages play crucial roles in organ-specific functions and homeostasis. In the adrenal gland, macrophages closely associate with sinusoidal capillaries in the aldosterone-producing zona glomerulosa. We demonstrate that macrophages preserve capillary specialization and modulate aldosterone secretion. Using macrophage-specific deletion of VEGF-A, single-cell transcriptomics, and functional phenotyping, we found that the loss of VEGF-A depletes PLVAP+ fenestrated endothelial cells in the zona glomerulosa, leading to increased basement membrane collagen IV deposition and subendothelial fibrosis. This results in increased aldosterone secretion, called “haptosecretagogue” signaling. Human aldosterone-producing adenomas also show capillary rarefaction and basement membrane thickening. Mice with myeloid cell-specific VEGF-A deletion exhibit elevated serum aldosterone, hypokalemia, and hypertension, mimicking primary aldosteronism. These findings underscore macrophage-to-endothelial cell signaling as essential for endothelial cell specialization, adrenal gland function, and blood pressure regulation, with broader implications for other endocrine organs.

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