The Influence of Atracurium, Cisatracurium, and Mivacurium on the Proliferation of Two Human Cell Lines In Vitro

We tested the influence of atracurium and cisatracurium (final concentrations: 0, 0.96, 3.2, 9.6, 32, and 96 &mgr;M) on proliferation of human cells (hepatoma HepG2 cells and human umbilical vein endothelial cells) in vitro. In additional experiments, glutathione, N-acetylcysteine, or carboxyl esterase was added before the addition of either relaxant. The number of cells counted after 72 h of incubation was expressed as a percentage of the mean cell number in wells incubated without additives. Atracurium and cisatracurium progressively decreased cell proliferation in a concentration-dependent pattern. With human umbilical vein endothelial cells, atracurium or cisatracurium (3.2 &mgr;M) decreased the cell count to 67.7 % (sd, 14.8%) and 50% (sd, 8.6%), respectively. Cell proliferation was not inhibited by mivacurium. The results were similar to those with HepG2 cells. Glutathione, N-acetylcysteine, and carboxyl esterase partially reversed the effects of atracurium and cisatracurium. When incubated in a buffer with glutathione, atracurium decreased the number of glutathione-sulfhydryl groups. The findings that atracurium and cisatracurium inhibit proliferation of human cell lines in vitro, but that mivacurium does not, and that this effect is alleviated by glutathione and N-acetylcysteine, as well as by the carboxyl esterase, indicate that the inhibition may be caused by the reactive acrylate metabolites.

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