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Glycogen Synthase Kinase 3 Is Essential for Intestinal Cell Niche and Digestive Function.

Minggang Yang1,2, Xiaohui Li3, Jiajia Zhan1

  • 1School of Life Science, Anhui Medical University, Hefei 230032, China.

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Glycogen synthase kinase 3 (GSK3) deletion disrupts intestinal niche integrity and digestive function by increasing β-catenin. Restoring β-catenin levels ameliorates these defects, revealing GSK3

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Area of Science:

  • Gastroenterology
  • Cell Biology
  • Developmental Biology

Background:

  • WNT/β-catenin signaling is crucial for intestinal stem cell function.
  • Glycogen synthase kinase 3 (GSK3) negatively regulates β-catenin.
  • The precise role of GSK3 in intestinal homeostasis is not fully understood.

Purpose of the Study:

  • To investigate the role of GSK3 in intestinal development, niche maintenance, and physiological function.
  • To elucidate the mechanisms underlying GSK3's influence on the intestinal stem cell niche.

Main Methods:

  • Generation of GSK3 knockout mouse models (single and double).
  • Histological analysis of intestinal tissues.
  • Assessment of cell populations within the intestinal crypt.
  • Evaluation of nutrient absorption and gut motility.

Main Results:

  • Complete GSK3 deletion (DKO) led to perinatal lethality with disturbed crypt-villus architecture and Paneth cell redistribution.
  • GSK3 deficiency resulted in expanded, mislocalized stem cells and Paneth cells, with reduced tuft and enteroendocrine cells.
  • Increased β-catenin signaling in GSK3-deficient intestines was observed.
  • Genetic ablation of β-catenin in DKO mice partially restored cell populations and improved physiological functions.

Conclusions:

  • GSK3/β-catenin signaling is essential for maintaining intestinal niche integrity.
  • Dysregulation of GSK3 impacts stem cell populations and differentiation.
  • GSK3 inhibition may represent a therapeutic target for intestinal and digestive disorders.