Microarray-based identification of age-dependent differences in gene expression of human dermal fibroblasts

Area of Science:

• Cellular and Molecular Biology
• Gerontology
• Biochemistry

Background:

• Cellular senescence is implicated in age-related tissue decline and diseases.
• The intricate regulation of senescence by upstream and downstream factors remains incompletely understood.

Purpose of the Study:

• To investigate age-related differences in gene expression and cellular pathways in human fibroblasts.
• To explore the role of senescence-associated markers, such as p16, in aging.

Main Methods:

• Whole genome gene expression profiling (microarray) of human fibroblast strains from young and oldest old individuals.
• Measurement of senescence-associated β-galactosidase activity.
• Quantitative PCR (qPCR), Western blotting, and immunocytochemistry for p16 gene analysis.

Main Results:

• Chronological age significantly altered gene sets involved in carbohydrate metabolism, Wnt/β-catenin signaling, cell cycle, glutamate signaling, RNA processing, and mitochondrial function.
• The p16 gene was identified as the most significantly differentially regulated mRNA with age.
• Senescence-associated β-galactosidase activity was measured.

Conclusions:

• Identified distinct cellular pathways differentially expressed between young and old human fibroblast strains.
• The study provides insights into the molecular mechanisms underlying age-related cellular changes and senescence.