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Area of Science:

  • Gastroenterology
  • Neuroscience
  • Cell Biology

Background:

  • Phosphatase and tensin homolog (Pten) is a critical regulator of cell proliferation.
  • Pten's role in postnatal enteric neurogenesis and gliogenesis is a potential therapeutic target for gastrointestinal disorders.

Purpose of the Study:

  • To investigate the effect of conditional Pten ablation in glial (Plp1-expressing) and neuronal (Calb2-expressing) cells on enteric nervous system development and function.
  • To assess the impact of Pten inhibition on gut motility and neuro/gliogenesis in adult mice, particularly in the context of induced colitis.

Main Methods:

  • Generation of tamoxifen-inducible Cre recombinase murine models for conditional Pten ablation in glia and neurons.
  • Administration of tamoxifen, dextran sodium sulfate (DSS) to induce colitis, and EdU for cell proliferation monitoring.
  • Evaluation of enteric nervous system, gut motility (colonic migrating motor complexes - CMMC), and whole gut transit times at early and late timepoints post-DSS.

Main Results:

  • Pten inhibition in Plp1-expressing glial cells induced gliogenesis in the colon and neurogenesis in the proximal colon post-DSS.
  • Glial Pten ablation led to increased CMMC frequency and slower whole gut transit times.
  • Pten inhibition in Calb2-expressing neuronal cells did not induce neurogenesis or gliogenesis, with no significant changes in gut motility.

Conclusions:

  • Conditional Pten inhibition in enteric glia promotes neurogenesis and gliogenesis and alters gut motility.
  • Targeting Pten in glial cells offers a potential strategy for conditions requiring increased glia or slower intestinal transit, such as short-bowel syndrome and rapid-transit disorders.
  • Pten's role in neuronal cells appears distinct, as its inhibition did not impact neurogenesis or motility in this model.