alexa Down-regulation of c-myc oncogene during NGF-induced differentiation of neuroblastoma cell lines.
Oncology

Oncology

Journal of Carcinogenesis & Mutagenesis

Author(s): Chen J, Liu T, Ross AH

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Abstract There may be a close relationship between myc oncogenes and carcinogenesis of human neuroblastoma. In previous studies, we were able to induce differentiation of certain neuroblastoma cell lines with NGF. In order to study gene regulation during differentiation, N-myc and c-myc cDNA probes were hybridized with RNA extracted from different cell lines before and after NGF treatment. It was found that cell lines which expressed N-myc did not express c-myc while those with c-myc did not express N-myc except for SHEP cell line which had neither c-myc nor N-myc expression. In NGF-induced differentiated neuroblastoma cells, c-myc oncogene was down-regulated in comparison with the control samples. The time course of c-myc down-regulation was concomitant with the appearance of morphological differentiation. In situ hybridization also showed remarkable reduction of c-myc oncogene expression in NGF-induced differentiated cells as compared with the untreated control cells. These results indicate that down-regulation of c-myc oncogene may be a key event during NGF-induced differentiation and over-expression of c-myc oncogene may, at least partially, be responsible for the genesis of neuroblastoma.
This article was published in Chin Med Sci J and referenced in Journal of Carcinogenesis & Mutagenesis

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