Transcriptome analysis of regenerated dermis stimulated by mechanical stretch

Area of Science:

• Regenerative Medicine
• Tissue Engineering
• Dermatology

Background:

• Mechanical stretch is vital for tissue expansion, promoting skin regeneration for wound healing and reconstruction.
• Expanded skin shows increased dermal area, but the underlying biological mechanisms remain unclear.

Purpose of the Study:

• To elucidate the molecular pathways and biological processes involved in dermal regeneration induced by mechanical stretch.
• To identify key genes and pathways regulating expanded skin formation.

Main Methods:

• A rat scalp expansion model was used, isolating dermis for RNA sequencing to identify differentially expressed genes (DEGs).
• Gene Ontology (GO), Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway, and Gene Set Enrichment Analysis (GSEA) were performed on DEGs.
• Protein-protein interaction (PPI) network analysis identified hub genes, with expression validated by quantitative real-time polymerase chain reaction (qPCR).

Main Results:

• 782 DEGs were identified, associated with extracellular matrix organization, macrophage activation, and angiogenesis.
• Key pathways included PI3K-Akt signaling, fatty acid metabolism, and extracellular matrix-receptor interactions.
• Ten hub genes (e.g., Ccl2, Fasn, Mmp9, Tlr2, Igf1) were identified and validated, linked to immune cell activity and matrix remodeling.

Conclusions:

• This study reveals DEGs, pathways, and hub genes in mechanical stretch-induced dermal regeneration.
• Findings highlight the roles of macrophage recruitment/polarization, fibroblast activity, ECM production, and angiogenesis.
• Identified molecular targets may advance therapeutic strategies for enhanced skin regeneration.