In addition, in the HepG2 cell experiment, some extrahepatic factors, such as erythroid-2-related factor 2 (NRF2) pathway [58], intestinal metabolite sodium butyrate (NaB) [59], Src homology region 2 domain-containing phosphatase-1 (SHP1)/AMPK [60], sirtuin 1 (SIRT1)/heat shock factor 1/heat shock protein (HSP) [61], and other signaling pathways have also been found to be involved in the regulation of liver lipid synthesis
3.3 Modulation of neuroendocrine signaling As a potential endocrine organ, the gut microbiota produces various metabolites with signaling functions or hormonal properties, including SCFAs, neurotransmitters, neuroactive compounds, bile acids, and choline metabolites
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In clinical trials, semaglutide produced roughly 15-17% average body weight reduction, while tirzepatide reached approximately 20-22% at the highest doses