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Sonic hedgehog from both nerves and epithelium is a key trophic factor for taste bud maintenance.

Development (Cambridge, England) | 2017

The integrity of taste buds is intimately dependent on an intact gustatory innervation, yet the molecular nature of this dependency is unknown. Here, we show that differentiation of new taste bud cells, but not progenitor proliferation, is interrupted in mice treated with a hedgehog (Hh) pathway inhibitor (HPI), and that gustatory nerves are a source of sonic hedgehog (Shh) for taste bud renewal. Additionally, epithelial taste precursor cells express Shh transiently, and provide a local supply of Hh ligand that supports taste cell renewal. Taste buds are minimally affected when Shh is lost from either tissue source. However, when both the epithelial and neural supply of Shh are removed, taste buds largely disappear. We conclude Shh supplied by taste nerves and local taste epithelium act in concert to support continued taste bud differentiation. However, although neurally derived Shh is in part responsible for the dependence of taste cell renewal on gustatory innervation, neurotrophic support of taste buds likely involves a complex set of factors.

Pubmed ID: 28743797 RIS Download

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Associated grants

  • Agency: NIDCD NIH HHS, United States
    Id: P30 DC004657
  • Agency: NINDS NIH HHS, United States
    Id: T32 NS099042
  • Agency: NIDCD NIH HHS, United States
    Id: R01 DC012675
  • Agency: NIDCD NIH HHS, United States
    Id: R01 DC000566
  • Agency: NIDCD NIH HHS, United States
    Id: R01 DC012383

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