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Non‐canonical endogenous expression of voltage‐gated sodium channel NaV1.7 subtype by the TE671 rhabdomyosarcoma cell line

N. Ngum,M. Y. A. Aziz,Liaque Mohammed Latif,Richard J. Wall,I. Duce,I. Mellor

Published 2022 in Journal of Physiology

ABSTRACT

The human TE671 cell line was originally used as a model of medulloblastoma but has since been reassigned as rhabdomyosarcoma. Despite the characterised endogenous expression of voltage‐sensitive sodium currents in these cells, the specific voltage‐gated sodium channel (VGSC) subtype underlying these currents remains unknown. To profile the VGSC subtype in undifferentiated TE671 cells, endpoint and quantitative reverse transcription–PCR (qRT‐PCR), western blot and whole‐cell patch clamp electrophysiology were performed. qRT‐PCR profiling revealed that expression of the SCN9A gene was ∼215‐fold greater than the SCN4A gene and over 400‐fold greater than any of the other VGSC genes, while western blot confirmed that the dominant SCN9A RNA was translated to a protein with a molecular mass of ∼250 kDa. Elicited sodium currents had a mean amplitude of 2.6 ± 0.7 nA with activation and fast inactivation V50 values of −31.9 ± 1.1 and −69.6 ± 1.0 mV, respectively. The currents were completely and reversibly blocked by tetrodotoxin at concentrations greater than 100 nm (IC50 = 22.3 nm). They were also very susceptible to the NaV1.7 specific blockers Huwentoxin‐IV and Protoxin‐II with IC50 values of 14.6 nm and 0.8 nm, respectively, characteristic of those previously determined for NaV1.7. Combined, the results revealed the non‐canonical and highly dominant expression of NaV1.7 in the human TE671 rhabdomyosarcoma cell line. We show that the TE671 cell line is an easy to maintain and cost‐effective model for the study of NaV1.7, a major target for the development of analgesic drugs and more generally for the study of pain.

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