USP45 Represses Melanoma Development by Deubiquitinating and Stabilizing Tumor Suppressor MRGPRF.

ABSTRACT: Melanoma, a highly malignant skin cancer, has seen a rising incidence and death toll. MRGPRF is a novel melanoma suppressor that inhibits the PI3K/AKT pathway. However, the regulation of MRGPRF in melanoma remains unclear. Here, 40 ubiquitin-specific proteases (USPs) are screened and USP45 is identified as a significant stabilizer of MRGPRF. Immunohistochemistry on melanoma patient biopsies demonstrates that USP45 expression is markedly reduced in melanoma tissues compared to adjacent noncancerous epidermis. Bioinformatic analyses corroborate that USP45 mRNA levels are downregulated in melanoma, and low USP45 expression is associated with poor patient prognosis. Functional assays demonstrate that USP45 overexpression inhibits melanoma cell malignancy, whereas USP45 knockdown promotes it. M

SUBMITTER: Zhang W 

PROVIDER: S-EPMC12561219 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature