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. 1987 Dec;7(12):4178–4184. doi: 10.1128/mcb.7.12.4178

Expression of c-src in cultured human neuroblastoma and small-cell lung carcinoma cell lines correlates with neurocrine differentiation.

K Mellström 1, C Bjelfman 1, U Hammerling 1, S Påhlman 1
PMCID: PMC368098  PMID: 2830484

Abstract

Human cell lines with neuronal and neuroendocrine features were examined for their expression of pp60c-src, the cellular homolog of the transforming gene product pp60v-src of Rous sarcoma virus. Four neuroblastoma (LA-N-5, SH-SY5Y, Paju, and SK-N-MC) and three small-cell lung carcinoma (U-2020, U-1690, and U-1285) cell lines were selected on the basis of their stage of neurocrine differentiation, as determined by the expression of neuron-specific enolase. In an immune complex protein kinase assay, all seven cell lines displayed c-src kinase activity which was considerably higher than that found in nonneurocrine cells (human diploid fibroblasts, glioma, and non-small cell lung carcinoma cell lines). Furthermore, the c-src kinase activity, as determined by autophosphorylation or phosphorylation of an exogenous substrate, enolase, correlated with the stage of neurocrine differentiation. There was an approximately 30-fold difference in c-src kinase autophosphorylation activity between the cell lines representing the highest and lowest stages of neurocrine differentiation. A similar variation was found in the steady-state levels of the c-src protein of these cell lines. Highly differentiated neuroblastoma cells expressed two forms of the src protein. Digestion by Staphylococcus aureus V8 protease did reveal structural diversity in the amino-terminal ends of these c-src molecules. In summary, we found a clear correlation between c-src kinase activity and the stage of neuronal and neuroendocrine differentiation. Thus, the phenotypic similarity between neurons and neuroendocrine cells includes high c-src expression.

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Selected References

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