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Rdh10-mediated Retinoic Acid Signaling Regulates the Neural Crest Cell Microenvironment During ENS Formation.

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Retinol dehydrogenase 10 (Rdh10) deficiency impairs enteric nervous system formation by disrupting neural crest cell migration, leading to Hirschsprung disease models. This highlights Rdh10

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Area of Science:

  • Developmental Biology
  • Neuroscience
  • Genetics

Background:

  • The enteric nervous system (ENS) regulates gastrointestinal function and develops from vagal neural crest cells (NCC).
  • Defects in NCC development cause gastrointestinal disorders like Hirschsprung disease (HSCR), with many genetic causes remaining unknown.
  • Vitamin A metabolism, regulated by Rdh10, is crucial for embryogenesis, but its role in ENS development is unclear.

Purpose of the Study:

  • To investigate the role of Rdh10 in enteric nervous system (ENS) development and its potential link to intestinal aganglionosis.
  • To identify the molecular mechanisms by which Rdh10 deficiency affects neural crest cell (NCC) migration and ENS formation.
  • To explore the therapeutic potential of understanding Rdh10's role in ENS development and related diseases.

Main Methods:

  • Utilized Rdh10 loss-of-function mouse models to study ENS development.
  • Analyzed NCC migration and differentiation in Rdh10 mutant embryos.
  • Performed comparative RNA-sequencing to identify altered gene expression networks.
  • Examined changes in the extracellular matrix composition in Rdh10 mutants.

Main Results:

  • Rdh10 deficiency in mouse embryos caused intestinal aganglionosis, a hallmark of HSCR.
  • Vagal NCC formed and migrated but failed to invade the foregut in Rdh10 mutants.
  • Rdh10 is essential for NCC invasion into the gut between E7.5-E9.5.
  • RNA-sequencing revealed downregulation of the Ret-Gdnf-Gfrα1 signaling pathway in Rdh10 mutants.
  • Extracellular matrix alterations, including increased collagen, were observed, restricting NCC entry.

Conclusions:

  • Rdh10-mediated vitamin A metabolism and retinoic acid signaling are critical for ENS formation.
  • Rdh10 regulates the NCC microenvironment, influencing their invasion into the developing gut.
  • Disruption of Rdh10 function contributes to intestinal aganglionosis pathogenesis by impairing NCC migration.
  • This study identifies Rdh10 as a key regulator in ENS development and a potential factor in HSCR etiology.