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Background <p>Fibrosis is a hallmark of organ failure observed after chronic epithelial injury and inflammation. The transforming growth factor beta (TGF-β) is the master regulator of fibrogenesis, so blockade of the TGF-β pathway is a potential treatment strategy for fibrosis; however, the therapeutic potential of pan-TGF-β blockade is limited by side effects.</p> Methods <p>We generated SOF10, a humanized antibody that targets latent TGF-β1 and selectively blocks protease- and integrin αvβ8-mediated latent TGF-β1 activation. We conducted gene expression and histological analyses in nonalcoholic steatohepatitis (NASH)/liver fibrosis and renal interstitial fibrosis models. We also evaluated the combination effect of SOF10 with an immune checkpoint inhibitor in a syngeneic mouse model and performed safety studies in mice and monkeys.</p> Results <p>Here we show that SOF10 reduces fibrosis in NASH/liver fibrosis and renal interstitial fibrosis models and improves renal function in a chronic kidney disease model. Furthermore, the combination of SOF10 with an anti-PD-L1 antibody decreases tumor growth in a syngeneic mouse model. SOF10 demonstrates safety in both mice and monkeys.</p> Conclusions <p>Selective blockade of latent TGF-β1 activation represents a promising approach for treating a broad range of fibrotic diseases and cancers. By specifically targeting TGF-β1, SOF10 may offer a safer and more effective therapeutic option compared to non-selective TGF-β inhibitors. This strategy has the potential to transform the treatment paradigm for fibrosis-related conditions.</p>

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Selective blockade of latent TGF-β1 activation suppresses tissue fibrosis with good safety

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月28日

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  • Masakazu Kanamori,
  • Izumi Sato,
  • Christine Xing’er Koo,
  • Yang Sun,
  • Hiroki Kawauchi,
  • Kenji Nakagawa,
  • Atsuko Murai,
  • Kentaro Asanuma,
  • Siok Wan Gan,
  • Chai Ling Pang,
  • Yuichiro Shimizu,
  • Meiri Shida-Kawazoe,
  • Chisako Kanamaru,
  • Yoko Kayukawa,
  • Natsuko Hada,
  • Ken Ohmine,
  • Takehisa Kitazawa,
  • Junichi Nezu,
  • Tomoyuki Igawa,
  • Hideaki Shimada

摘要

Background

Fibrosis is a hallmark of organ failure observed after chronic epithelial injury and inflammation. The transforming growth factor beta (TGF-β) is the master regulator of fibrogenesis, so blockade of the TGF-β pathway is a potential treatment strategy for fibrosis; however, the therapeutic potential of pan-TGF-β blockade is limited by side effects.

Methods

We generated SOF10, a humanized antibody that targets latent TGF-β1 and selectively blocks protease- and integrin αvβ8-mediated latent TGF-β1 activation. We conducted gene expression and histological analyses in nonalcoholic steatohepatitis (NASH)/liver fibrosis and renal interstitial fibrosis models. We also evaluated the combination effect of SOF10 with an immune checkpoint inhibitor in a syngeneic mouse model and performed safety studies in mice and monkeys.

Results

Here we show that SOF10 reduces fibrosis in NASH/liver fibrosis and renal interstitial fibrosis models and improves renal function in a chronic kidney disease model. Furthermore, the combination of SOF10 with an anti-PD-L1 antibody decreases tumor growth in a syngeneic mouse model. SOF10 demonstrates safety in both mice and monkeys.

Conclusions

Selective blockade of latent TGF-β1 activation represents a promising approach for treating a broad range of fibrotic diseases and cancers. By specifically targeting TGF-β1, SOF10 may offer a safer and more effective therapeutic option compared to non-selective TGF-β inhibitors. This strategy has the potential to transform the treatment paradigm for fibrosis-related conditions.