TASL mediates keratinocyte differentiation by regulating intracellular calcium levels and lysosomal function

Area of Science:

• Cell Biology
• Dermatology
• Molecular Biology

Background:

• Epidermal homeostasis depends on keratinocyte proliferation and differentiation.
• Lysosome dysfunction is increasingly recognized in keratinocyte regulation.
• TLR adaptor interacting with SLC15A4 on the lysosome (TASL) regulates endo-lysosomal pH.

Purpose of the Study:

• To investigate the role of TASL in keratinocyte proliferation and differentiation.
• To elucidate the impact of TASL deficiency on keratinocyte cell cycle and lysosomal function.

Main Methods:

• Utilized a TASL knockout human keratinocyte cell line (HaCaT).
• Assessed keratinocyte proliferation, migration, and cell cycle progression (G1/S arrest).
• Analyzed lysosomal function and calcium modulation in TASL-deficient cells.

Main Results:

• TASL deficiency significantly hindered keratinocyte proliferation and migration.
• TASL knockout induced G1/S cell cycle arrest.
• Impaired lysosomal function and altered calcium modulation were observed in TASL-deficient keratinocytes, disrupting differentiation.

Conclusions:

• TASL plays a novel and essential role in keratinocyte proliferation and differentiation.
• TASL deficiency disrupts epidermal homeostasis by affecting cell cycle, lysosomal function, and calcium regulation.
• These findings offer new insights into keratinocyte biology and potential therapeutic targets.