Proteasome Subunit Alpha Type-7 Expression Suppresses Cutaneous Squamous Cell Carcinoma Progression by Inhibiting...

Area of Science:

• Oncology
• Molecular Biology
• Immunology

Background:

• Cutaneous squamous cell carcinoma (cSCC) is a prevalent non-melanoma skin cancer with increasing incidence.
• The role of Proteasome subunit alpha type-7 (PSMA7) in cancer pathogenesis, including cSCC, is debated.
• This study investigates the specific functions of PSMA7 in the development of cSCC.

Purpose of the Study:

• To elucidate the role of PSMA7 in the pathogenesis of cutaneous squamous cell carcinoma (cSCC).
• To determine the relationship between PSMA7 expression and clinicopathological features and patient survival in cSCC.
• To investigate the in vitro effects of PSMA7 modulation on cSCC cell behavior and cytokine expression.

Main Methods:

• Clinicopathological characteristics of 131 cSCC patients were analyzed.
• Immunohistochemical staining assessed PSMA7, NOD1, and MAVS expression in cSCC tissues.
• In vitro experiments evaluated the impact of PSMA7 down-regulation on cSCC cell viability, invasiveness, and cytokine mRNA expression.

Main Results:

• High PSMA7 expression correlated with favorable recurrence-free survival and lower histologic grade in cSCC patients.
• PSMA7 expression was negatively correlated with NOD1 and MAVS expression in cSCC tissues.
• PSMA7 down-regulation in vitro reduced cSCC cell viability and invasiveness while increasing pro-inflammatory cytokine mRNA levels (TNF-α, IL-1α, IL-6, IL-8).

Conclusions:

• PSMA7 exhibits antitumoral functions in cSCC, potentially through the degradation of NOD1 and MAVS.
• This degradation may lead to the suppression of a cancer-associated cytokine network.
• PSMA7's role as a tumor suppressor in cSCC warrants further investigation for therapeutic strategies.