Nevus depigmentosus is a stable and well-circumscribed congenital hypomelanosis that may be in an isolated, dermatomal or systemic form. An 18-yr-old Korean man with segmental nevus depigmentosus developed multiple pigmented nevi which were present only within the confines of the leukoderma. Histologic and electron microscopic studies rendered a diagnosis of nevus depigmentosus with dysplastic nevus to the patient. The genetic alteration of melanocytes in the hypopigmented lesion is assumed to have resulted in the development of multiple pigmented nevi.
Adolescent ; Humans ; Hypopigmentation/*congenital/pathology ; Male ; Nevus, Pigmented/metabolism/*pathology

Child ; Choroid Neoplasms ; diagnosis ; diagnostic imaging ; metabolism ; pathology ; Female ; Humans ; Immunohistochemistry ; Nevus, Pigmented ; diagnostic imaging ; metabolism ; pathology ; S100 Proteins ; metabolism ; Ultrasonography

OBJECTIVE: To investigate the expression profile of miR-122-5p in melanoma tissues and the effect of miR-122-5p on the proliferation, cell cycle and apoptosis of human melanoma cell lines SK-MEL-110 and A375. METHODS: The expression profiles of miR-122-5p in melanoma and pigmented nevus tissues were detected using real-time fluorescence quantitative PCR (qRT-PCR). SK-MEL-110 and A375 cells transfected with miR-122-5p inhibitor or negative control inhibitor (NC) I were examined for miR-122- 5p expression using qRT-PCR and changes in cell proliferation, cell cycle and apoptosis using MTT assay or flow cytometry. NOP14 mRNA and protein expressions in the cells were detected using qRT- PCR and Western blotting, respectively. Luciferase reporter assay was used to confirm the identity of NOP14 as the direct target of miR-122-5p. RESULTS: The relative expression of miR-122-5p in human pigmented nevus tissues and melanoma tissues was 1.23±0.270 and 7.65 ± 1.37, respectively. The relative expression of miR-122-5p in SK-MEL-110 and A375 cells transfected with miR-122-5p inhibitor was 0.21 ± 0.08 and 0.17 ± 0.05, respectively. miR-122-5p inhibitor obviously inhibited the cell proliferation and increased the percentage of cells in G1 stage in both SK-MEL-110 and A-375 cells, but did not cause obvious changes in the apoptosis of the two cells. miR-122-5p inhibitor did not significantly affect the expression level of NOP14 mRNA, but obviously increased the expression level of NOP14 protein. Luciferase reporter assay revealed a significantly lower luciferase activity in cells co-transfected with miR-122-5p mimics and wild-type psi-CHECK2-3'UTR plasmid than in the cells cotransfected with NC and wild-type psi-CHECK2-3'UTR plasmid (0.21 ± 0.14 0.56 ± 0.1, < 0.01). CONCLUSIONS miR-122-5p expression is upregulated in melanoma tissues, indicating its involvement in the development of melanoma. miR-122-5p inhibits the proliferation of SK-MEL-110 and A-375 cells possibly by affecting the cycle through NOP14.
Apoptosis ; Cell Cycle ; Cell Line, Tumor ; Cell Proliferation ; Humans ; Luciferases ; metabolism ; Melanoma ; etiology ; metabolism ; pathology ; MicroRNAs ; antagonists & inhibitors ; metabolism ; Neoplasm Proteins ; metabolism ; Nevus, Pigmented ; etiology ; metabolism ; pathology ; Nuclear Proteins ; metabolism ; Skin Neoplasms ; etiology ; metabolism ; pathology ; Up-Regulation

No abstract available.
Base Sequence ; Child, Preschool ; DNA/chemistry/metabolism ; Female ; Humans ; Mutation ; Nevus, Pigmented/diagnosis/*genetics ; Polymorphism, Single Nucleotide ; Proto-Oncogene Proteins p21(ras)/*genetics ; Republic of Korea ; Skin/pathology ; Skin Neoplasms/diagnosis/*genetics ; Syndrome