Toxicological Research

Korean Society of Toxicology & Korea Environmental Mutagen Society (한국독성학회)
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Evaluation of Cytotoxicity to Rat Platelets by Menadione-Glutathione Conjugate and its Stability in Biological Assay System

Menadione의 대사체인 Menadione-Glutathione Conjugate(MEN-SG)가 흰쥐 혈소판에 미치는 세포독성의 평가 및 MEN-SG의 안정성에 관한 연구

  • Published : 1995.12.01
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Abstract

Menadione-ghitathione conjugate (MEN-SG), a metabolite of menadione, is known to be a redoxcycler in rat hepatocyte subcellular fraction. Therefore, it was assumed that MEN-SG could exert cytotoxlclty to ral platelets, another target tissue of menadione. We first synthesized MEN-SG, the identity of which was verified by mass, $^1{H}$-NMR and UV-visible spectra. In addition, the stability of MEN-SG was investigated in biological assay system. MEN-SG was degraded in a time-dependent manner in DMSO which had been used as a vehicle and thus, tris-HCl buffer was used as a vehicle of MEN-SG despite the low solubility in it. Perchloric acid as well as platelets itself did not affect the stability of MEN-SG. Our next attempt was the evaluation of cytotoxicity of MEN-SG in rat platelets. MEN-SG did not induce cytotoxicity to rat platelets measured by two different methods, LDH release and turbidity changes. The extents of oxygen consumption by MEN-SG in intact platelets were significantly lower than those by menadione, though it had been observed that oxygen consumptions by menadione and MENSG were similar in subcellular fractioas of platelets. These results suggest that MEN-SG is not toxic to rat platelets despite its redox cycling capacity and glutathione conjugation reaction of menadione could be regarded as a detoxification process.

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References

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