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Emerging transit-amplifying cells (TACs) orchestrate hair follicle regeneration by signaling to stem cells (SCs). This process requires TAC-produced Sonic Hedgehog (SHH) to activate quiescent SCs, ensuring tissue repair.

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Regenerative Medicine

Background:

  • Transit-amplifying cells (TACs) are crucial intermediates in tissue regeneration.
  • Hair follicles (HFs) serve as a model system to study regeneration dynamics.
  • Stem cell (SC) populations, including primed and quiescent states, play distinct roles in HF cycling.

Purpose of the Study:

  • To elucidate the role of emerging TACs in orchestrating tissue growth within hair follicles.
  • To investigate the signaling mechanisms by which TACs regulate stem cell proliferation and tissue regeneration.
  • To understand the interdependency between primed and quiescent stem cell populations during regeneration.

Main Methods:

  • Utilized hair follicles as a model system to study cell dynamics.
  • Investigated the expression and function of Sonic Hedgehog (SHH) signaling.
  • Analyzed the roles of primed and quiescent stem cells in response to TAC signals.

Main Results:

  • Emerging TACs form a signaling center that orchestrates HF growth.
  • TAC generation is independent of autocrine SHH, but TAC pool maintenance requires SHH production.
  • SHH signaling promotes quiescent SC proliferation and regulates dermal factors for TAC expansion.
  • Quiescent SCs' sensitivity to SHH is linked to high GAS1 expression.
  • Insufficient quiescent SC input compromises primed SC replenishment, delaying regeneration.

Conclusions:

  • TACs are transient but essential integrators of stem cell niche components.
  • An intriguing interdependency exists between primed and quiescent SC populations for effective tissue regeneration.
  • Disruption of TAC-SHH signaling can lead to regeneration failure.