Local microenvironment provides important cues for cell differentiation in lingual epithelia

Area of Science:

• Developmental biology
• Stem cell research
• Genetics

Background:

• Keratin14 (K14) is expressed in tongue epithelia.
• Transforming growth factor-beta (TGF-β) signaling regulates cell cycle and proliferation.
• Dominant-negative ΔTgfbr2 disrupts TGF-β signaling.

Purpose of the Study:

• To investigate the role of TGF-β signaling in tongue epithelial development.
• To track the fate of K14+ progenitor cells in vivo.
• To understand how microenvironmental cues influence cell lineage development.

Main Methods:

• Utilized inducible transgenic mice (Keratin14-rtTA-PTR) for Doxycycline (Dox)-inducible gene expression.
• Co-expressed Enhanced Green Fluorescent Protein (EGFP) and dominant-negative ΔTgfbr2.
• Employed immunohistochemical and immunofluorescent imaging to track K14+ cells.

Main Results:

• Disruption of TGF-β signaling led to shortened cell cycles and stem cell pool proliferation.
• K14+ cells exhibited distinct developmental patterns along the tongue's anterior-posterior axis.
• Observed variable K14 gene expression correlating with tongue location and papillae.

Conclusions:

• TGF-β signaling is a critical regulator of tongue epithelial stem cell proliferation.
• Positional information from the microenvironment influences tongue cell lineage development.
• Inducible transgenic systems enable rapid observation of cell fate following genetic manipulation.