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Synergy of 5-aminolevulinate supplement and CX3CR1 suppression promotes liver regeneration via elevated IGF-1 signaling.

Published:29 August 2023 DOI: 10.1016/j.celrep.2023.112984 PMID: 37578861
Liang Chen, Lele Zhang, Guanghui Jin, Yasong Liu, Na Guo, Haobin Sun, Yong Jiang, Xiaomei Zhang, Guobin He, Guo Lv, Jinghong Yang, Xuanjun Tu, Tao Dong, Huanyi Liu, Jianhong An, Ge Si, Zhuang Kang, Hua Li, Shuhong Yi, Guihua Chen, Wei Liu, Yang Yang, Jingxing Ou

Abstract

Inadequate remnant volume and regenerative ability of the liver pose life-threatening risks to patients after partial liver transplantation (PLT) or partial hepatectomy (PHx), while few clinical treatments focus on safely accelerating regeneration. Recently, we discovered that supplementing 5-aminolevulinate (5-ALA) improves liver cold adaptation and functional recovery, leading us to uncover a correlation between 5-ALA metabolic activities and post-PLT recovery. In a mouse 2/3 PHx model, 5-ALA supplements enhanced liver regeneration, promoting infiltration and polarization of anti-inflammatory macrophages via P53 signaling. Intriguingly, chemokine receptor CX3CR1 functions to counterbalance these effects. Genetic ablation or pharmacological inhibition of CX3CR1 (AZD8797; phase II trial candidate) augmented the macrophagic production of insulin-like growth factor 1 (IGF-1) and subsequent hepatocyte growth factor (HGF) production by hepatic stellate cells. Thus, short-term treatments with both 5-ALA and AZD8797 demonstrated pro-regeneration outcomes superior to 5-ALA-only treatments in mice after PHx. Overall, our findings may inspire safe and effective strategies to better treat PLT and PHx patients.

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