Amination Potentially Augments the Ameliorative Effect of Curcumin on Inhibition of the IL-6/Stat3/c-Myc Pathway and Gut Microbial Modulation in Colitis-Associated Tumorigenesis

Abstract

Epigallocatechin gallate and tetrahydrocurcumin are aminated as colonic metabolites, preserving their bioactivities and improving their capabilities. We compared the bioactivities of unaminated (CUR) and aminated (AC) curcumin in inflammatory colitis-associated tumorigenesis. The anti-inflammatory and anticancer capabilities of CUR and AC were evaluated using RAW264.7 and HT29 cell lines, respectively. An azoxymethane/dextran sodium sulfate-induced colitis-associated carcinogenesis mouse model was used with CUR and two-dose AC interventions. AC had a greater anti-inflammatory effect but a similar anticancer effect as CUR in vitro. CUR and low-dose AC (LAC) significantly preserved colon length and reduced tumor number in vivo. Both CUR and LAC inhibited activation of the protein kinase B (AKT)/nuclear factor kappa B (NF-κB) signaling pathway, its downstream cytokines, and the interleukin (IL)-6/signal transducer and activator of transcription 3 (STAT3)/cmyelocytomatosis oncogene (c-MYC) pathway. However, only LAC significantly preserved E-cadherin, reduced N-cadherin, and facilitated beneficial gut microbial growth, including Akkermansia and Bacteroides, potentially explaining AC's better ameliorative effect at low than high doses.

Influence of gut microecology in the development of malignant tumors and its potential therapeutic application: A review

“…IRS/PI3K/AKT Corynebacterium glutamicum Type 2 diabetic mellitus [115] Curcumin Curcuma longa L. IL-6/Stat3/c-Myc Akkermansia, Bacteroides Colitis-associated tumorigenesis [116] Astragalus polysaccharide Astragalus TLR4/ NF-κB Probiotics Idiopathic pulmonary fibrosis [117] Resveratrol Polygonum cuspidatum NF-κB, IL-6, TNF-α, MCP-1…”