Altered pathways of keratinization, extracellular matrix generation, angiogenesis, and stromal stem cells...

Area of Science:

• Immunology
• Dermatology
• Genomics

Background:

• Systemic sclerosis (SSc) is a complex autoimmune disease marked by endothelial dysfunction, immune system abnormalities, and progressive fibrosis affecting skin and internal organs.
• The precise pathogenetic mechanisms driving SSc vasculopathy, fibroblast activation, and extracellular matrix deposition remain incompletely understood.
• Existing research highlights a complex interplay of cellular and extracellular factors, yet the primary drivers are unclear.

Purpose of the Study:

• To identify functional pathways and potential biomarkers associated with SSc pathogenesis, endothelial dysfunction, and fibrosis using transcriptomic analysis.
• To compare gene expression profiles between SSc patients and healthy controls to uncover disease-specific molecular signatures.
• To lay the groundwork for developing novel diagnostic markers and therapeutic strategies for SSc.

Main Methods:

• RNA sequencing was performed on tissue biopsies from three SSc patients and three healthy controls.
• Transcriptomic analysis involved generating sequencing libraries and performing gene set enrichment analysis on differentially expressed genes.
• Pathway analysis was conducted on the complete RNA-sequencing expression matrix to identify enriched biological processes.

Main Results:

• Healthy controls exhibited gene signatures related to stromal stem cell proliferation and immune cell metabolism.
• SSc tissues showed enrichment in gene signatures associated with keratinization, cornification, and cell cycle regulation (RB1, TP53 signaling).
• Differential gene expression in SSc was linked to keratinization, extracellular matrix generation, and negative regulation of angiogenesis and stem cell proliferation.

Conclusions:

• RNA sequencing and pathway analysis reveal a distinct gene expression pattern in SSc patients, characterized by keratinization and impaired stromal stem cell proliferation.
• The findings suggest a potential role for keratinization pathways and highlight the negative regulation of angiogenesis and stem cell proliferation in SSc.
• While further validation in larger cohorts is necessary, these results offer a promising framework for developing SSc biomarkers and future therapeutic interventions.