Protein tyrosine phosphatase non-receptor type 12 (PTPN12)

Protein tyrosine phosphatase non-receptor type 12 (PTPN12), also known as PTP-PEST, is a cytoplasmic enzyme that plays a critical role in regulating cellular processes such as migration, adhesion, and growth through the dephosphorylation of specific tyrosine residues [1, 3]. It serves as a master regulator of multiple receptor tyrosine kinases (RTKs), including EGFR, HER2, and MET, as well as focal adhesion proteins like p130cas and paxillin [8, 12]. In many oncological contexts, particularly triple-negative breast cancer (TNBC), PTPN12 acts as a tumor suppressor; its inactivation or downregulation leads to the aberrant activation of signaling pathways that drive tumor progression and metastasis [6, 14]. Conversely, in cardiovascular pathology, such as myocardial ischemia-reperfusion injury, PTPN12 activation is associated with promoting cell death, making it a target for inhibitory therapeutic intervention [11]. While direct PTPN12-targeted drugs are still in the experimental phase, the gold-based drug auranofin has been identified as a potential inhibitor, and PTPN12 deficiency is frequently utilized as a biomarker to predict clinical response to combined RTK inhibitor therapies [2, 8, 11].

Other names

PTP-PESTPTPG1Protein-tyrosine phosphatase G1PTP-G1PTP-PEST1

Catalytic removal of phosphate groups from phosphotyrosine residues on target proteins to inhibit downstream signaling of receptor tyrosine kinases and focal adhesion complexes.