PMID- 34374401 OWN - NLM STAT- MEDLINE DCOM- 20220214 LR - 20240109 IS - 2042-650X (Electronic) IS - 2042-6496 (Linking) VI - 12 IP - 18 DP - 2021 Sep 20 TI - Sargassum fusiforme fucoidan alleviates diet-induced insulin resistance by inhibiting colon-derived ceramide biosynthesis. PG - 8440-8453 LID - 10.1039/d1fo01272j [doi] AB - Sargassum fusiforme fucoidan (SFF) is a highly sulfated heteropolysaccharide with various biological activities. As one of the causative factors of type 2 diabetes mellitus (T2DM), insulin resistance has become a global health issue. In this study, we investigated the potential pharmacological mechanisms by which SFF ameliorates insulin resistance in high-fat diet (HFD)-fed mice. SFF significantly enhanced tauroursodeoxycholic acid (TUDCA, a conjugated bile acid) levels and inhibited the farnesoid X receptor (FXR) signaling in the colon. SFF administration reduced ceramide levels in both serum and colonic tissue of HFD-fed mice, as well as reduced expression of SPT and CerS genes, which encode enzymes crucial to the biosynthesis of ceramides regulated by FXR signaling. Pearson's analysis showed that the TUDCA level was positively correlated with the gut bacteria Clostridium, and this was further validated in pseudo-germfree mice. Taken together, the results suggested that SFF increased TUDCA levels by remodeling gut microbiota, and TUDCA, a natural FXR antagonist, inhibited the FXR/SHP signaling pathway to reduce colon-derived biosynthesis of ceramide, thereby improving insulin resistance in the diet-induced obese (DIO) mice. This study has provided new insights into the therapeutic potential of S. fusiforme fucoidan in metabolic diseases. FAU - Zhang, Ya AU - Zhang Y AD - College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China. tonghaibin@gmail.com. AD - Environmental Science and Environmental Engineering, University of Northern British Columbia, Prince George, BC, Canada. FAU - Liu, Jian AU - Liu J AD - College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China. tonghaibin@gmail.com. FAU - Mao, Genxiang AU - Mao G AUID- ORCID: 0000-0001-7061-4479 AD - Zhejiang Provincial Key Lab of Geriatrics, Department of Geriatrics, Zhejiang Hospital, Hangzhou 310013, China. FAU - Zuo, Jihui AU - Zuo J AD - College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China. tonghaibin@gmail.com. FAU - Li, Shijun AU - Li S AD - College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China. tonghaibin@gmail.com. FAU - Yang, Yue AU - Yang Y AD - College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China. tonghaibin@gmail.com. FAU - Thring, Ronald W AU - Thring RW AD - Environmental Science and Environmental Engineering, University of Northern British Columbia, Prince George, BC, Canada. FAU - Wu, Mingjiang AU - Wu M AD - College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China. tonghaibin@gmail.com. FAU - Tong, Haibin AU - Tong H AUID- ORCID: 0000-0002-7645-3458 AD - College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China. tonghaibin@gmail.com. LA - eng PT - Journal Article DEP - 20210920 PL - England TA - Food Funct JT - Food & function JID - 101549033 RN - 0 (Ceramides) RN - 0 (Polysaccharides) RN - 0 (Receptors, Cytoplasmic and Nuclear) RN - 0C5V0MRU6P (farnesoid X-activated receptor) RN - 516-35-8 (Taurochenodeoxycholic Acid) RN - 60EUX8MN5X (ursodoxicoltaurine) RN - 9072-19-9 (fucoidan) SB - IM MH - Animals MH - Caco-2 Cells MH - Ceramides/*biosynthesis MH - Colonic Neoplasms MH - Diet, High-Fat/*adverse effects MH - Gastrointestinal Microbiome MH - Humans MH - *Insulin Resistance MH - Male MH - Mice MH - Mice, Inbred ICR MH - Obesity/chemically induced MH - Polysaccharides/chemistry/*pharmacology MH - Receptors, Cytoplasmic and Nuclear MH - Sargassum/*chemistry MH - Taurochenodeoxycholic Acid/pharmacology EDAT- 2021/08/11 06:00 MHDA- 2022/02/15 06:00 CRDT- 2021/08/10 09:20 PHST- 2021/08/11 06:00 [pubmed] PHST- 2022/02/15 06:00 [medline] PHST- 2021/08/10 09:20 [entrez] AID - 10.1039/d1fo01272j [doi] PST - epublish SO - Food Funct. 2021 Sep 20;12(18):8440-8453. doi: 10.1039/d1fo01272j.