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Related Experiment Video

Updated: Feb 26, 2026

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Stim1 Regulates Enamel Mineralization and Ameloblast Modulation.

Y Furukawa1,2, N Haruyama1, M Nikaido1

  • 11 Section of Orthodontics and Dentofacial Orthopedics, Division of Oral Health, Growth, and Development, Faculty of Dental Science, Kyushu University, Fukuoka, Japan.

Journal of Dental Research
|July 22, 2017
PubMed
Summary

Store-operated calcium entry (SOCE) is crucial for enamel mineralization. Loss of Stim1 in mice leads to defective enamel, highlighting its role in ameloblast maturation.

Keywords:
amelogenesiscalcium channelcalcium signalingdental enamelion transporttooth

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Biochemistry

Background:

  • Loss-of-function mutations in ORAI1 and STIM1 genes impair store-operated calcium entry (SOCE), causing ectodermal dysplasia and amelogenesis imperfecta.
  • Limited patient tissue hinders direct analysis of enamel mineralization and ameloblast function in humans.

Purpose of the Study:

  • To investigate the role of STIM1 and STIM2 in enamel formation and mineralization using conditional knockout mouse models.
  • To analyze the impact of abrogating SOCE on ameloblast morphology and function during tooth development.

Main Methods:

  • Generated ectodermal tissue-specific conditional knockout (cKO) mice for Stim1, Stim2, and both Stim1/2.
  • Analyzed enamel phenotypes, including mineralization, structural integrity, and tooth morphology.
  • Examined ameloblast morphology and gene expression of enamel matrix proteins and proteases.

Main Results:

  • Ablation of Stim1 and Stim1/2, but not Stim2, resulted in chalky enamel with severe attrition and inferior mineralization.
  • Enamel structural integrity was impaired in Stim1 and Stim1/2 cKO mice, though tooth shape and thickness remained normal.
  • Ameloblast morphology was largely unaffected, but modulation cycles in maturation-stage ameloblasts were prolonged in Stim1 and Stim1/2 cKO incisors.

Conclusions:

  • Store-operated calcium entry (SOCE) mediated by STIM proteins is essential for proper enamel mineralization.
  • STIM1 plays a critical role in regulating ameloblast modulation during enamel maturation.
  • These findings provide insights into the molecular mechanisms underlying amelogenesis imperfecta and tooth development.