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Bound Polyphenols in Rice Bran Insoluble Dietary Fiber Ameliorate Intestinal Barrier Damage via Butyrate-Mediated Regulation of Apoptosis-Autophagy Signaling.

Bing Zheng,Li Liu,Jun Li,Yi Chen,Jianhua Xie,Xiaole Zhao,Jinhua Feng,Qing Zhou,Xiaobo Hu,Qiang Yu

Published 2025 in Journal of Agricultural and Food Chemistry

ABSTRACT

Bound polyphenols (BPs) are critical to the anti-obesity effects of dietary fiber. However, their role in dietary-fiber-mediated intestinal barrier protection remains unclear. In this study, we demonstrated that rice bran insoluble dietary fiber (RIDF) alleviated intestinal barrier damage in high-fat-diet (high-fat diet)-fed mice, and this beneficial effect was dependent on BPs, as it was attenuated in mice treated with polyphenol-removed dietary fiber (RIDF_DF). Furthermore, fecal supernatant transplantation from RIDF-treated (not RIDF_DF-treated) mice alleviated obesity and reshaped the gut microbiota in recipient mice. Additionally, the fecal supernatant enhanced the intestinal barrier function and augmented the synthesis of short-chain fatty acids. Notably, butyrate administration upregulated intestinal tight junction proteins in Caco-2 cells and HFD-fed mice and increased Oscillospira abundance. Mechanistically, butyrate inhibited apoptosis and promoted autophagy, accompanied by alterations in the AMPK-Akt signaling pathway. These results indicate that BPs contribute to the ameliorative effect of RIDF on intestinal damage.

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