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Mechanosensitive Piezo1 Channels in Enamel Cells.

Guilherme H Souza Bomfim1, Anna Zou1, Fabio A Echeverry2

  • 1Department of Molecular Pathobiology, Metabolism & Inflammation Research Group, New York University College of Dentistry, New York, NY, 10010, USA.

Calcified Tissue International
|April 26, 2026
PubMed
Summary
This summary is machine-generated.

Ameloblasts, enamel-forming cells, utilize Piezo1 channels to regulate calcium (Ca2+) levels during enamel development. While functional, these channels are not essential for the final hardness or mineralization of enamel.

Keywords:
Ameloblasts, Piezo1Ca2+ signalingIon channelsMechanosensitive channels

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Area of Science:

  • Cell Biology
  • Biophysics
  • Mineralization

Background:

  • Ameloblasts are crucial for enamel formation, requiring precise calcium transport during secretory and maturation stages.
  • Mechanical forces are present during enamel development, suggesting a role for mechanosensitive channels in ameloblasts.
  • Piezo1 channels are mechanosensitive ion channels permeable to calcium, potentially influencing calcium homeostasis in mineralizing cells.

Purpose of the Study:

  • To investigate the presence and function of Piezo1 channels in ameloblasts.
  • To determine the role of Piezo1-mediated calcium influx in ameloblast function.
  • To assess the contribution of Piezo1 to enamel mineralization and mechanical properties.

Main Methods:

  • Protein expression analysis of Piezo1 in secretory and maturation stage ameloblasts.
  • Patch-clamp electrophysiology to detect stretch-activated currents in cultured ameloblasts.
  • Cytosolic calcium imaging using Fura-2 in response to Piezo1 activator (Yoda1) and blockers.
  • Mechanical testing of incisors from Piezo1 conditional knockout (cKO) mice.

Main Results:

  • Secretory and maturation stage ameloblasts express similar protein levels of Piezo1.
  • Cultured ameloblasts exhibit stretch-activated currents, indicating functional mechanosensitive channels.
  • Yoda1 stimulation increases cytosolic calcium in ameloblasts, an effect blocked by Piezo1 inhibitors.
  • Piezo1 deficiency in mice does not alter enamel hardness or elastic modulus.

Conclusions:

  • Piezo1 channels are functional in both secretory and maturation stage ameloblasts.
  • Piezo1 activation elevates cytosolic calcium levels in ameloblasts.
  • Despite functional expression, Piezo1 is not essential for enamel mineralization or achieving its final mechanical properties.