Unraveling the Molecular Mechanisms Linking Cigarette Smoke Exposure to Skin Damage

Area of Science:

• Environmental Toxicology
• Dermatology
• Molecular Biology

Background:

• Cigarette smoke (CS) is a pervasive environmental pollutant with known adverse health effects.
• The precise molecular mechanisms underlying CS-induced skin damage remain incompletely understood.

Purpose of the Study:

• To elucidate the molecular mechanisms by which CS causes skin damage.
• To identify key molecular targets and pathways involved in CS-induced skin pathology.

Main Methods:

• Integrated approach combining Liquid Chromatography-Mass Spectrometry (LC-MS), network toxicology, molecular docking, and in vitro experimental validation.
• Database searching, Protein-Protein Interaction (PPI) network construction, Gene Ontology (GO), and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis.
• In vitro experiments using HaCaT cells to validate molecular findings.

Main Results:

• Identified 57 candidate targets associated with CS-induced skin damage, with STAT3, AKT1, TP53, CASP3, and IL-6 playing central roles.
• Network analysis highlighted the PI3K-Akt, p53, JAK-STAT, and apoptosis pathways as critical.
• Molecular docking confirmed significant interactions between CS components and identified key targets.
• In vitro studies showed CS exposure altered the expression of key proteins (e.g., decreased STAT3/AKT, increased p53/CASP3/IL-6) in HaCaT cells.

Conclusions:

• CS exposure triggers skin damage through inhibition of PI3K-AKT and JAK-STAT signaling, alongside activation of p53-mediated apoptosis.
• These molecular events result in cytotoxicity, impaired skin function, oxidative stress, and inflammation.
• Findings offer a molecular understanding of CS skin damage, supporting regulatory measures and prevention strategies.