Telomere dysfunction impairs epidermal stem cell specification and differentiation by disrupting BMP/pSmad/P63...

Area of Science:

• Molecular Biology
• Genetics
• Dermatology

Background:

• Telomere shortening is linked to aging and diseases.
• Telomere dysfunction can cause premature aging, including skin atrophy and hair loss.
• The molecular mechanisms connecting telomere dysfunction to skin atrophy are not fully understood.

Purpose of the Study:

• To elucidate the molecular signaling pathways linking telomere dysfunction to skin atrophy.
• To investigate the role of BMP/pSmad/P63 signaling in telomere-related skin aging.

Main Methods:

• Utilized an ESC differentiation model and adult telomere-shortened mice.
• Investigated the impact of Terc loss on Follistatin (Fst) expression.
• Analyzed the disruption of PRC2/H3K27me3-mediated repression of Fst.

Main Results:

• Dysfunctional telomeres disrupt BMP/pSmad/P63 signaling, impairing epidermal stem cell differentiation.
• Telomere shortening up-regulates Follistatin (Fst), inhibiting pSmad signaling and down-regulating P63 and keratins.
• Short telomeres disrupt PRC2/H3K27me3 repression of Fst.

Conclusions:

• Skin atrophy from telomere dysfunction is linked to Follistatin (Fst) and BMP signaling.
• This pathway represents a potential therapeutic target for age-related skin conditions.