A novel N18TG2 x mesencephalon cell hybrid expresses properties that suggest a dopaminergic cell line of substantia nigra origin

A dopaminergic neuroblastoma was derived using somatic cell fusion of rat embryonic mesencephalon cells and the murine neuroblastoma-glioma cell line N18TG2. The resulting interspecies hybrid, named MES23.5, has retained a stable phenotype and karyotype for a continuous culture period of 1 year. The hybrid exhibits several properties that suggest that the parent primary neurons originated in the substantia nigra. The cell line contains tyrosine hydroxylase, which is identifiable both by biochemical and immunological methods and synthesizes dopamine, but no other catecholamine. Additionally, the cell line expresses apparent voltage-gated CA2+ channels as measured by high-affinity omega- conotoxin binding. The MES23.5 omega-conotoxin receptors are of similar affinity class to those found in adult rat mesencephalon. No dihydropyridine receptors, as measured by PN200–100 ligand binding, are present. None of these properties are found in the N18TG2 parent. At least three neuronal features, namely, tyrosine hydroxylase, dopamine synthesis, and omega-conotoxin receptor expression, are quantitatively elevated after sustained treatment with cAMP analogs. The cell line expresses a complex range of neural properties found in the dopaminergic neurons of the substantia nigra, and may therefore be useful elucidating further details of their cell biology.

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