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PTPRM
PTPRM Full Name
protein tyrosine phosphatase, receptor type, M
PTPRM Introduction
Protein tyrosine phosphatase receptor type M (PTPRM), also known as receptor-type tyrosine-protein phosphatase μ (RPTPμ), is a transmembrane member of the type IIB receptor protein tyrosine phosphatase (R2B RPTP) family that integrates cell-cell adhesion with intracellular phosphotyrosine signaling. Unlike soluble phosphatases, PTPRM contains a large extracellular region composed of immunoglobulin-like and fibronectin type III domains that mediate highly selective homophilic interactions between neighboring cells, while its intracellular phosphatase domains regulate phosphorylation-dependent signaling networks. Structural studies have shown that the extracellular domain adopts a rigid, elongated architecture capable of forming homophilic dimers with remarkable molecular specificity, allowing PTPRM to stabilize tissue architecture while coordinating communication between adjacent cells. This unique combination of adhesive and catalytic functions makes PTPRM particularly relevant for researchers investigating epithelial integrity, developmental biology, tissue remodeling, and diseases characterized by disrupted cell-cell junctions.
At the cellular level, PTPRM serves as an important regulator of signaling pathways controlling proliferation, migration, differentiation, and cytoskeletal organization. Through dephosphorylation of specific substrates, PTPRM influences Src family kinase activity, PI3K/AKT signaling, β-catenin-associated adhesion complexes, and additional phosphorylation-dependent pathways that determine whether cells remain stably attached or acquire migratory behavior. Emerging evidence also indicates that PTPRM contributes to immune regulation by negatively modulating STAT3 activation, linking this receptor to inflammatory signaling beyond its established role in epithelial biology. The biological activity of PTPRM is further shaped by its extracellular adhesive interface, where structural analyses have demonstrated that subtle amino acid differences and local environmental factors, including pH, alter homophilic dimer formation and receptor specificity. These findings have broadened scientific interest in PTPRM from a classical phosphatase to a multifunctional signaling receptor whose extracellular architecture directly influences intracellular signal transduction, making it an attractive target for structural biology, signal transduction research, and therapeutic discovery.
Growing clinical evidence highlights that the pathological significance of PTPRM is highly tissue-dependent, creating both opportunities and challenges for biomarker development. In cervical cancer, elevated PTPRM expression has been associated with poor prognosis, enhanced epithelial-mesenchymal transition (EMT), activation of the Src-AKT signaling axis, increased VEGF-C-mediated lymphangiogenesis, and a greater propensity for lymph node metastasis, suggesting that PTPRM may function as a promoter of tumor progression in specific malignancies. In contrast, epithelial ovarian cancer exhibits significantly reduced PTPRM expression compared with normal ovarian tissue, supporting a potential tumor-suppressive role and emphasizing that PTPRM biology varies substantially across different tumor types. Beyond oncology, recent human genetic studies have linked homozygous loss of PTPRM to juvenile-onset autoimmune disease, where impaired phosphatase activity may permit excessive STAT3 signaling and dysregulated immune responses. Collectively, these discoveries position PTPRM as an increasingly important target in cancer biology, immunology, and precision medicine, while underscoring the importance of interpreting its expression and function within the specific cellular and disease context rather than assuming a universal biological role.
Alternate Names for PTPRM
PTPRM; protein tyrosine phosphatase, receptor type, M; PTPRL1; receptor-type tyrosine-protein phosphatase mu; hR PTPu; RPTPU; protein tyrosine phosphatase mu; protein-tyrosine phosphatase mu; protein tyrosine phosphatase, receptor type, mu polypeptide; RPTPM; hR-PTPu; R-PTP-MU; MGC166994;
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