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Evaluation of the mechanisms involved in sodium diethyl dithiocarbamate-induced immunomodulation using the hydrophilic analog, sodium N-methyl-D-glucamine dithiocarbamate.

Sodium diethyl dithiocarbamate (DE-DTC) is a lipophilic low molecular weight sulphur compound previously demonstrated to be a potent immunomodulator but cytotoxic in vitro. In this work, we studied the effects on a hydrophilic analog of DE-DTC, sodium N-Methyl-D-glucamine dithiocarbamate (NMG-DTC) on immune responses to a hapten carrier conjugate and on mitogen-induced lymphoproliferation. NMG-DTC, in contrast to DE-DTC, did not modify the responses to a hapten-carrier conjugate. The immunomodulatory activity of DE-DTC appeared to be linked with its lipophilicity. NMG-DTC had a slight inhibitory effect on thymidine incorporation by lymphocytes stimulated by mitogens as compared to that of DE-DTC. DE-DTC was cytotoxic possibly at the cell membrane level; cytotoxicity was not related to the chelating properties of DE-DTC in the culture medium. On the other hand, NMG-DTC appeared to be a less cytotoxic molecule. Therefore it could be useful to study the effects of the dithiocarbamate moiety at the cellular level.