<scp>PTPN9</scp> promotes melanoma progression by regulating the ferroptosis pathway

In recent years, there has been a gradual increase in the incidence and mortality rates of melanoma, posing a significant threat to human health and life. Protein tyrosine phosphatases (PTPNs) have been implicated in the progression of various human cancers, including breast, lung, and cervical cancer. To investigate PTPN9 expression in melanoma, impacting the disease's survival and prognosis. Our study, which involved an analysis of The Cancer Genome Atlas database and immunohistochemical staining of pathological sections, identified an upregulation of PTPN9 expression in melanoma, impacting the disease's survival and prognosis. At the cellular level, we investigated the effects of PTPN9 on the proliferation, invasion, and metastasis of A375 and SK-MEL-28 cells. Through various experimental techniques such as Western blot protein detection, electron microscopy, and oil red O staining, we observed that PTPN9 potentially contributes to the development of skin cutaneous melanoma (SKCM) by regulating ferroptosis-related proteins ACSL4, FTH1, and P53, thereby influencing lipid metabolism. The results of this study highlight the unique role of PTPN9 in SKCM and suggest its potential as a biomarker for the disease.