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In vitro effects of lithium and nickel at different levels on Neuro-2a mouse Neuroblastoma cells

Published on Aug 1, 2001in Toxicology in Vitro3.067
· DOI :10.1016/S0887-2333(01)00037-6
Guillermo Repetto20
Estimated H-index: 20
,
A. del Peso6
Estimated H-index: 6
+ 1 AuthorsManuel Repetto19
Estimated H-index: 19
Abstract
Lithium and nickel present low toxicity, but are able to cause alterations in different tissues. The toxic effects of lithium and nickel at different cellular levels were assessed using two inorganic chemical species: lithium chloride and nickel(II) chloride. Mouse neuroblastoma cell cultures (Neuro-2a) were exposed to both compounds for 24 h. The cytotoxic effects evaluated were cell proliferation by quantification of total protein content, cytoplasmic membrane integrity to cytosolic lactate dehydrogenase leakage, and lysosomal hexosaminidase release. Metabolic markers were lactate dehydrogenase activity and mitochondrial succinate dehydrogenase activity. Lysosomal markers were relative neutral red uptake by lysosomes, and lysosomal hexosaminidase sphingolipid degradation activity. Acetylcholinesterase activity on intact cells was also quantified. Nickel was found to be 36 times more toxic than lithium to neuroblastoma cell proliferation (EC50= 0.29 and 10.5 mm, respectively), but the relative extent of other alterations differed. Lithium stimulated nearly all the indicators studied, particularly lactate dehydrogenase, mitochondrial succinate dehydrogenase and acetylcholinesterase activities, as well as hexosaminidase release. In contrast, nickel mainly stimulated hexosaminidase release and inhibited lactate dehydrogenase activity. The stabilization of the cytoplasmic membrane to lactate dehydrogenase leakage simultaneously with the secretion of lysosomal hexosaminidase for both compounds also shows that functional metabolic alterations produced by lithium and nickel are more important than cytoplasmic damage. # 2001 Published by Elsevier Science Ltd.
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