ACTIVATION OF MURINE LYMPHOCYTES BY 2-MERCAPTOETHANOL AND RELATED THIOL COMPOUNDS AND ITS MECHANISM. II. EFFECT OF THIOL COMPOUNDS ON THE VIABILITY OF THE LYMPHOCYTES UNDER A CYSTINE-DEFICIENT CULTURE CONDITION

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When murine lymphocytes were cultured in a cystine-deficient RPMI-1640 medium containing 10% fetal calf serum, approximately 70% of the cells died in 48 h. In the presence of 5×10^<-4>ML-cystine, 70-80% of the lymphocytes remained viable under the same condition. The decrease of the viability was also effectively inhibited when cystine was replaced by the following thiol compounds ; 2-mercaptoethanol (2-ME), dithiothreitol (DTT), cysteamine and glutathione (GSH). Oxidized DTT, an intramolecular disulfide that was resistant to the reduction by the lymphocytes, did not show a protective effect in contrast to DTT. On the other hand, 2-hydroxyethyldisulfide was readily reduced to 2-ME by the lymphocytes and improved lymphocyte viability as effectively as 2-ME. These observations suggest that thiol groups are responsible for the improvement of lymphocyte viability under a cystine-deficient condition. The viabilities of both T cells and B cells were equally improved by 2-ME. The intracellular level of GSH remained constant in the presence of cystine but dropped rapidly in its absence. 2-ME could not reverse this decrease of GSH level. These protective effects of thiol compounds on lymphocyte viability are discussed in relation to their capacities to activate murine lymphocytes.
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