Biomedicine & Pharmacotherapy (Jul 2023)

TLR8 agonist Motolimod-induced inflammatory death for treatment of acute myeloid leukemia

  • Wei Yang,
  • Xiongfei Sun,
  • Shuai Liu,
  • Ying Xu,
  • Yunlei Li,
  • Xiaoru Huang,
  • Kaiqing Liu,
  • Longyi Mao,
  • Shasha Min,
  • Linjiang Liu,
  • Shi Li,
  • Yuqi Zhu,
  • Yu Zhang,
  • Xina Xie,
  • Kui Xu,
  • Changqing Sun,
  • Jie Yan,
  • Zesong Li

Journal volume & issue
Vol. 163
p. 114759

Abstract

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The clinical treatment of AML is dominated by ''7 + 3'' therapy, but it often shows great toxicity and limited therapeutic efficacy in application. Therefore, it is urgent to develop novel therapeutic strategies to achieve safe and efficient treatment of AML. Small-molecule inhibitors have the characteristics of high specificity, low off-target toxicity and remarkable therapeutic effect, and are receiving more and more attention in tumor therapy. In this study, we screened a library of 1972 FDA-approved small molecular compounds for those that induced the inflammatory death of AML cells, among which the TLR8 agonist Motolimod (MTL) showed stronger anti-AML activity in the animal model but slight affection on normal lymphocytes in control mice. In terms of mechanism, cellular experiments in AML cell lines proved that TLR8 and LKB1/AMPK are the key distinct mechanisms for MTL triggered caspase-3-dependent cell death and the expression of a large number of inflammatory factors. In conclusion, our findings identified the immunoactivator MTL as a single agent exerting significant anti-AML activity in vitro and in vivo, with strong potential for clinical translation.

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