Author(s): West GJ, Uki J, Herschman HR, Seeger RC
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Abstract Cultured human neuroblastoma cell lines were assayed for biochemical characteristics of neuonal function. Cell lines studied included LA-N-1, LA-N-2, IMR-32, SK-N-SH, and SK-N-MC. Veratridine-dependent uptake of 22Na+ implied the presence of the action potential Na+ ionophore in LA-N-1, LA-N-2, IMR-32, and SK-N-SH. The time course of 22Na+ uptake and inhibition of uptake by tetrodotoxin supported this. SK-N-MC had no veratridine-dependent 22Na+ uptake. Tyrosine hydroxylase (EC 1.14.10.), glutamic acid decarboxylase (EC 184.108.40.206), and acetylcholine contents in neuroblastoma cells were compared to those in brain. LA-N-1 and IMR-32 contained 15 and 5 times as much tyrosine hydroxylase, respectively, whereas LA-N-2, SK-N-SH, and SK-N-MC contained only 0.5 to 5\% of that in brain. Acetylcholine was present in -LA-N-2 in 15- to 20-fold greater quantities than in brain; other lines had only 10 to 50\% of that in brain. None of the cell lines contained glutamic acid decarboxylase. Thus, continuously propogated human neuroblastoma cell lines may have the action potential Na+ ionophore and may be adrenergic (LA-N-1 and IMR-32), cholinergic (LA-N-2), or inactive (SK-N-SH and SK-N-MC). This is the first demonstration of the action potential Na+ ionophore and of acetylcholine production in human neuroblastoma cell lines.
This article was published in Cancer Res
and referenced in Journal of Steroids & Hormonal Science