Cell Reports (Jul 2021)

Dysregulated oxalate metabolism is a driver and therapeutic target in atherosclerosis

  • Yuhao Liu,
  • Ying Zhao,
  • Yousef Shukha,
  • Haocheng Lu,
  • Lu Wang,
  • Zhipeng Liu,
  • Cai Liu,
  • Yang Zhao,
  • Huilun Wang,
  • Guizhen Zhao,
  • Wenying Liang,
  • Yanbo Fan,
  • Lin Chang,
  • Arif Yurdagul, Jr.,
  • Christopher B. Pattillo,
  • A. Wayne Orr,
  • Michael Aviram,
  • Bo Wen,
  • Minerva T. Garcia-Barrio,
  • Jifeng Zhang,
  • Wanqing Liu,
  • Duxin Sun,
  • Tony Hayek,
  • Y. Eugene Chen,
  • Oren Rom

Journal volume & issue
Vol. 36, no. 4
p. 109420

Abstract

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Summary: Dysregulated glycine metabolism is emerging as a common denominator in cardiometabolic diseases, but its contribution to atherosclerosis remains unclear. In this study, we demonstrate impaired glycine-oxalate metabolism through alanine-glyoxylate aminotransferase (AGXT) in atherosclerosis. As found in patients with atherosclerosis, the glycine/oxalate ratio is decreased in atherosclerotic mice concomitant with suppression of AGXT. Agxt deletion in apolipoprotein E-deficient (Apoe−/−) mice decreases the glycine/oxalate ratio and increases atherosclerosis with induction of hepatic pro-atherogenic pathways, predominantly cytokine/chemokine signaling and dysregulated redox homeostasis. Consistently, circulating and aortic C-C motif chemokine ligand 5 (CCL5) and superoxide in lesional macrophages are increased. Similar findings are observed following dietary oxalate overload in Apoe−/− mice. In macrophages, oxalate induces mitochondrial dysfunction and superoxide accumulation, leading to increased CCL5. Conversely, AGXT overexpression in Apoe−/− mice increases the glycine/oxalate ratio and decreases aortic superoxide, CCL5, and atherosclerosis. Our findings uncover dysregulated oxalate metabolism via suppressed AGXT as a driver and therapeutic target in atherosclerosis.

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