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<p>The mechanisms sustaining chronic inflammation in rheumatoid arthritis (RA) remain incompletely understood. Here we show that branched-chain amino acid (BCAA) catabolism, mediated by the mitochondrial enzyme BCAT2, sustained interferon-driven macrophage activation in autoimmune arthritis. Multi-omics and histological analyses of individuals with active RA or sustained remission revealed that active disease was associated with systemic BCAA depletion, synovial branched-chain ketoacid accumulation and elevated BCAT2 expression in interferon-responsive synovial macrophages. Mechanistically, interferon-γ induced BCAT2 transcription through the transcription factor IRF1 in RA synovial macrophages. In human monocyte-derived macrophages, BCAT2-dependent BCAA catabolism elevated mitochondrial reactive oxygen species, which in turn restrained SHP-1 activity, prolonged STAT1 and STAT2 phosphorylation and drove inflammatory cytokine production. Furthermore, myeloid-specific deletion of Bcat2 ameliorated collagen antibody-induced arthritis in mice. Pharmacological targeting of this pathway with telmisartan suppressed persistent arthritis in methotrexate-treated mice. Together, our findings identified BCAT2-dependent amino acid catabolism as a potentially targetable metabolic pathway in autoimmune arthritis.</p>

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BCAT2 links branched-chain amino acids metabolism to interferon signaling to sustain macrophage inflammation

  • 期刊论文

  • 发表日期：

    2026年7月31日

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  • Xiaohui Meng,
  • Haihui Han,
  • Wulin You,
  • Pengfei Xin,
  • Ya Ju,
  • Liangyu Cai,
  • Lamei Zhou,
  • Sheng Zhong,
  • Zhuoyi Hu,
  • Zhiyu Chen,
  • Wenlei Qin,
  • Yanhao Ge,
  • Wei Yao,
  • Lianbo Xiao,
  • Yafeng Zhang

摘要

The mechanisms sustaining chronic inflammation in rheumatoid arthritis (RA) remain incompletely understood. Here we show that branched-chain amino acid (BCAA) catabolism, mediated by the mitochondrial enzyme BCAT2, sustained interferon-driven macrophage activation in autoimmune arthritis. Multi-omics and histological analyses of individuals with active RA or sustained remission revealed that active disease was associated with systemic BCAA depletion, synovial branched-chain ketoacid accumulation and elevated BCAT2 expression in interferon-responsive synovial macrophages. Mechanistically, interferon-γ induced BCAT2 transcription through the transcription factor IRF1 in RA synovial macrophages. In human monocyte-derived macrophages, BCAT2-dependent BCAA catabolism elevated mitochondrial reactive oxygen species, which in turn restrained SHP-1 activity, prolonged STAT1 and STAT2 phosphorylation and drove inflammatory cytokine production. Furthermore, myeloid-specific deletion of Bcat2 ameliorated collagen antibody-induced arthritis in mice. Pharmacological targeting of this pathway with telmisartan suppressed persistent arthritis in methotrexate-treated mice. Together, our findings identified BCAT2-dependent amino acid catabolism as a potentially targetable metabolic pathway in autoimmune arthritis.