Nature Communications (Oct 2023)

Fibroblast growth factor 18 stimulates the proliferation of hepatic stellate cells, thereby inducing liver fibrosis

  • Yuichi Tsuchiya,
  • Takao Seki,
  • Kenta Kobayashi,
  • Sachiko Komazawa-Sakon,
  • Shigeyuki Shichino,
  • Takashi Nishina,
  • Kyoko Fukuhara,
  • Kenichi Ikejima,
  • Hidenari Nagai,
  • Yoshinori Igarashi,
  • Satoshi Ueha,
  • Akira Oikawa,
  • Shinya Tsurusaki,
  • Soh Yamazaki,
  • Chiharu Nishiyama,
  • Tetuo Mikami,
  • Hideo Yagita,
  • Ko Okumura,
  • Taketomo Kido,
  • Atsushi Miyajima,
  • Kouji Matsushima,
  • Mai Imasaka,
  • Kimi Araki,
  • Toru Imamura,
  • Masaki Ohmuraya,
  • Minoru Tanaka,
  • Hiroyasu Nakano

DOI
https://doi.org/10.1038/s41467-023-42058-z
Journal volume & issue
Vol. 14, no. 1
pp. 1 – 20

Abstract

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Abstract Liver fibrosis results from chronic liver injury triggered by factors such as viral infection, excess alcohol intake, and lipid accumulation. However, the mechanisms underlying liver fibrosis are not fully understood. Here, we demonstrate that the expression of fibroblast growth factor 18 (Fgf18) is elevated in mouse livers following the induction of chronic liver fibrosis models. Deletion of Fgf18 in hepatocytes attenuates liver fibrosis; conversely, overexpression of Fgf18 promotes liver fibrosis. Single-cell RNA sequencing reveals that overexpression of Fgf18 in hepatocytes results in an increase in the number of Lrat + hepatic stellate cells (HSCs), thereby inducing fibrosis. Mechanistically, FGF18 stimulates the proliferation of HSCs by inducing the expression of Ccnd1. Moreover, the expression of FGF18 is correlated with the expression of profibrotic genes, such as COL1A1 and ACTA2, in human liver biopsy samples. Thus, FGF18 promotes liver fibrosis and could serve as a therapeutic target to treat liver fibrosis.