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Gold kinetics under long-term treatment with gold(I) disodium thiomalate: a comparison in three different mouse strains.

Following weekly i.m. injections of gold(I) disodium thiomalate (GST), mice of strains A.SW and C57BL/6 develop adverse immune reactions, whereas DBA/2 mice do not. We have studied the pharmaco-toxicokinetics of gold in these strains under chronic GST treatment. Our results indicate that the susceptible strains A.SW and C57BL/6 accumulate significantly higher gold concentrations in the liver and spleen compared to the resistant strain DBA/2. In the kidney of DBA/2 mice, gold concentrations persisted at a plateau level, whereas in A.SW and, particularly, C57BL/6 mice early peaks of gold concentrations were followed by a transient decrease, suggestive of tubular toxicity. Whereas splenic T and B cells failed to contain measurable gold concentrations in all three strains, splenic and peritoneal macrophages contained relatively high levels, more so in the susceptible strain C57BL/6 than in the resistant DBA/2 strain. This finding is consistent with the concept that macrophages play an important role in both the adverse and the beneficial effects of gold drugs.