[Preliminary study on E-cadherin expression in dexamethasone-induced palatal cleft in mouse]

Area of Science:

• Developmental biology
• Teratology
• Molecular biology

Background:

• Glucocorticoids like dexamethasone (DEX) are known teratogens that can induce cleft palate.
• E-cadherin, a key cell adhesion molecule, is downregulated during normal palate fusion.
• The precise molecular mechanisms by which DEX induces cleft palate are not fully understood.

Purpose of the Study:

• To investigate the role of E-cadherin expression changes in dexamethasone-induced cleft palate in mice.
• To determine if altered E-cadherin expression is associated with the incidence of cleft palate following DEX exposure.

Main Methods:

• Pregnant mice were administered DEX or saline (control) during critical developmental periods (E10.0-E12.0).
• Hematoxylin and eosin staining assessed palatal morphology.
• Immunohistochemistry and real-time quantitative PCR evaluated E-cadherin and β-catenin expression levels.

Main Results:

• DEX treatment resulted in a 43.59% incidence of cleft palate, compared to 3.03% in controls.
• DEX-exposed embryos exhibited shortened palatal processes that failed to fuse.
• E-cadherin and β-catenin expression levels were elevated in the palatal tissues of DEX-treated mice.

Conclusions:

• Dexamethasone induces cleft palate in mice, associated with increased E-cadherin and β-catenin expression.
• These molecular changes may inhibit mesenchymal cell growth, contributing to the failure of palate fusion.
• The study highlights a potential mechanism involving E-cadherin and β-catenin in DEX-induced teratogenicity.