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- W2045477037 abstract "Congenital melanocytic nevi (CMNs) are melanocytic neoplasms that can transform into melanoma. However, this development is impeded in the majority of cases and mostly affects patients with large or giant CMNs.To elucidate mechanisms that keep CMNs from malignant transformation, CMN tissue biopsies were investigated for p-ERK and senescence markers by immunohistochemistry and for SOX10/CD271 (p75(NTR)) by immunofluorescence. CMN cells were cultivated, and MTT assays were performed for evaluating cell viability. Mutation status for NRAS and BRAF was performed by real-time PCR.13 CMNs (from patients aged 0.5-11.8 years, mean: 2.7) showed immunoreactivity for SOX10/CD271 (p75(NTR)) in 34.2%. p-ERK was immunoreactive in 80% (4/5); β-galactosidase was significantly stronger expressed in CMNs compared to melanocytic nevi of patients over 70 years (p = 0.0085). The 5 CMN cultures were immunoreactive for SOX10/CD271 (p75(NTR)) in 36.7%. By silencing SOX10 by siRNA in 2 CMN cell cultures, cell viability decreased significantly. NRAS(Q61K) mutation was found in 91.7% (11/12) and BRAF(V600E) in 6.3% of all analyzable CMNs (1/16).Oncogene-induced senescence might prevent malignant transformation through activation of the mitogen-activated protein kinase pathway. SOX10 is necessary for the viability of human CMN cell cultures and may be responsible for clinical changes during aging." @default.
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- W2045477037 date "2014-05-01" @default.
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- W2045477037 title "Coexpression of SOX10/CD271 (p75<sup>NTR</sup>) and β-Galactosidase in Large to Giant Congenital Melanocytic Nevi of Pediatric Patients" @default.
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- W2045477037 doi "https://doi.org/10.1159/000362490" @default.
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