Store-operated Ca2+ Entry Modulates the Expression of Enamel Genes.

Area of Science:

• Cell Biology
• Biochemistry
• Developmental Biology

Background:

• Dental enamel formation relies on ameloblasts and precise enamel matrix protein (EMP) expression for crystal development.
• Calcium ion (Ca2+) homeostasis in ameloblasts is critical but poorly understood.
• Store-operated Ca2+ entry (SOCE) is a key mechanism for cellular Ca2+ influx.

Purpose of the Study:

• To investigate if SOCE mediates Ca2+ influx in ameloblasts.
• To determine if SOCE influences the expression of enamel matrix proteins (EMPs).
• To identify the specific Ca2+ channels involved in ameloblast Ca2+ regulation.

Main Methods:

• Utilized ameloblast-like LS8 cells and primary murine enamel organ cells.
• Stimulated cells with thapsigargin to activate SOCE.
• Assessed Ca2+ influx and EMP expression (Amelx, Ambn, Enam, Mmp20).
• Employed a CRAC channel inhibitor to block SOCE.

Main Results:

• LS8 cells express Ca2+-handling molecules and exhibit SOCE-mediated Ca2+ influx.
• SOCE activation significantly increased the expression of key EMPs: Amelx, Ambn, Enam, and Mmp20.
• CRAC channel inhibition reversed the SOCE-induced increase in EMP expression.
• Data confirm CRAC channels mediate Ca2+ influx in enamel cells.

Conclusions:

• Ca2+ influx via CRAC channels is essential for regulating EMP expression in ameloblasts.
• Ca2+ signaling plays a dual role in enamel development: mineralization and gene expression regulation.
• Understanding this pathway offers insights into maintaining dental enamel integrity.