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Lin, Yuan; Dong, Meng‐Qi; Liu, Zhi‐Min; Xu, Meng; Huang, Zhi‐Hao; Liu, Hong‐Juan; Gao, Yi; Zhou, Wei‐Jie
Hepatology (Baltimore, Md.), September 2022, Volume: 76, Issue: 3Journal Article
Background and Aims No effective treatments are available for liver fibrosis. Angiogenesis is deeply involved in liver fibrogenesis. However, current controversial results suggest it is difficult to treat liver fibrosis through vascular targeting. There are three different microvessels in liver: portal vessels, liver sinusoids, and central vessels. The changes and roles for each of the three different vessels during liver fibrogenesis are unclear. We propose that they play different roles during liver fibrogenesis, and a single vascular endothelial cell (EC) regulator is not enough to fully regulate these three vessels to treat liver fibrosis. Therefore, a combined regulation of multiple different EC regulatory signaling pathway may provide new strategies for the liver fibrosis therapy. Herein, we present a proof‐of‐concept strategy by combining the regulation of leukocyte cell‐derived chemotaxin 2 (LECT2)/tyrosine kinase with immunoglobulin‐like and epidermal growth factor–like domains 1 signaling with that of vascular endothelial growth factor (VEGF)/recombinant VEGF (rVEGF) signaling. Approach and Results The CCl4‐induced mouse liver fibrosis model and NASH model were both used. During fibrogenesis, vascular changes occurred at very early stage, and different liver vessels showed different changes and played different roles: decreased portal vessels, increased sinusoid capillarization and the increased central vessels the increase of portal vessels alleviates liver fibrosis, the increase of central vessels aggravates liver fibrosis, and the increase of sinusoid capillarization aggravates liver fibrosis. The combinational treatment of adeno‐associated viral vector serotype 9 (AAV9)–LECT2–short hairpin RNA (shRNA) and rVEGF showed improved therapeutic effects, but it led to serious side effects. The combination of AAV9‐LECT2‐shRNA and bevacizumab showed both improved therapeutic effects and decreased side effects. Conclusions Liver vascular changes occurred at very early stage of fibrogenesis. Different vessels play different roles in liver fibrosis. The combinational treatment of AAV9‐LECT2‐shRNA and bevacizumab could significantly improve the therapeutic effects on liver fibrosis.
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