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<p>It is thought that polysaccharides cannot penetrate the intestinal mucosa into the circulatory system due to their high hydrophilicity and large molecular size. However, we show that different linked and charged polysaccharides can penetrate Caco-2 cell monolayers, and find β−1,3-linked glucan and α−1,4-linked glucan is detectable in rats (male) and mice plasma and liver after oral administration the isotope (<sup>99m</sup>Tc, <sup>3</sup>H) and fluorescein labeled polysaccharides. Using gene-knockdown strategies and inhibitors, we further show polysaccharide uptake requires clathrin heavy chain (CLTC) and its associated factors Rab5 and dynamin1 in intestinal cells. Strikingly, polysaccharide absorption is attenuated in both <i>CLTC</i> intestine deficient mice and <i>RAB5A</i>, <i>DNM1</i>conventional-knockout mice. Importantly, membrane receptors bone morphogenetic protein receptor type IA (BMPRIA), Dectin-1 and epidermal growth factor receptor (EGFR) are also critical for specific structural polysaccharide internalization. These findings provide novel insight to understand polysaccharide absorption mechanism and lay foundation for oral polysaccharide-based new drugs development.</p>

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1,3-and 1,4-linked polysaccharides uptake in intestinal cells relies on clathrin/dynamin 1/Rab5-dependent endocytosis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月26日

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  • Wenfeng Liao,
  • Dianxiu Cao,
  • Ying Wang,
  • Zhenyun Du,
  • Jian Yao,
  • Pengfei Dou,
  • Yuandong Zheng,
  • Zhiming Wang,
  • Xia Chen,
  • Peipei Wang,
  • Chungwah Ma,
  • Hao Chen,
  • Xingxing Diao,
  • Kaiping Wang,
  • Kan Ding

摘要

It is thought that polysaccharides cannot penetrate the intestinal mucosa into the circulatory system due to their high hydrophilicity and large molecular size. However, we show that different linked and charged polysaccharides can penetrate Caco-2 cell monolayers, and find β−1,3-linked glucan and α−1,4-linked glucan is detectable in rats (male) and mice plasma and liver after oral administration the isotope (99mTc, 3H) and fluorescein labeled polysaccharides. Using gene-knockdown strategies and inhibitors, we further show polysaccharide uptake requires clathrin heavy chain (CLTC) and its associated factors Rab5 and dynamin1 in intestinal cells. Strikingly, polysaccharide absorption is attenuated in both CLTC intestine deficient mice and RAB5A, DNM1conventional-knockout mice. Importantly, membrane receptors bone morphogenetic protein receptor type IA (BMPRIA), Dectin-1 and epidermal growth factor receptor (EGFR) are also critical for specific structural polysaccharide internalization. These findings provide novel insight to understand polysaccharide absorption mechanism and lay foundation for oral polysaccharide-based new drugs development.