Tubulin Beta-3 Chain as a New Candidate Protein Biomarker of Human Skin Aging: A Preliminary Study

Area of Science:

• Biochemistry
• Dermatology
• Proteomics

Background:

• Skin aging is a complex biological process with significant research efforts focused on identifying diagnostic and therapeutic targets.
• Previous studies primarily analyzed gene expression changes, with limited investigation at the protein level, especially using global quantitative proteomic approaches.

Purpose of the Study:

• To identify novel protein biomarkers associated with skin aging using a global quantitative labeled proteomic off-gel approach.
• To characterize the proteomic changes in human skin keratinocytes during the aging process.

Main Methods:

• Human primary keratinocytes from sun-nonexposed skin biopsies of young and elderly women were analyzed.
• A global quantitative labeled proteomic off-gel approach was employed to identify and quantify proteins.
• Differentially expressed proteins were analyzed using Gene Ontology and pathway analysis.

Main Results:

• A total of 517 unique proteins were identified, with 58 significantly differentially expressed between young and elderly skin.
• 40 proteins were downregulated and 18 were upregulated with aging.
• Dysregulated proteins were primarily involved in metabolism, cell cycle, and signaling pathways.
• Tubulin beta-3 chain expression changes were validated by western blot.

Conclusions:

• The study identified key proteins involved in cellular processes affected by skin aging.
• Tubulin beta-3 chain is proposed as a promising biomarker for skin aging due to its altered expression.
• This proteomic approach provides a more accurate description of the skin aging phenotype.