[Effects of ascorbic acid on the free radical formations of isoniazid and its metabolites].

イソニアジドのフリーラジカル中間代謝物に及ぼすアスコルビン酸の影響

By the use of electron spin resonance (ESR) spectroscopy and of spin-trapping technique, the effects of ascorbic acid on the formation of the free radical intermediates due to isoniazid (INAH) and its metabolites were investigated with a microsomal system. When alpha-(4-pyridyl 1-oxide)-N-tert butylnitrone (4-POBN) was used as a spin trapping agent, the ESR signal due to hydrazine (Hy) was formed to be most intensive among others. Therefore, it was presumed that Hy is a potent intermediate to cause an INAH-induced hepatic injury. In the presence of ascorbic acid (AA), the free radical formation of Hy, INAH and acetyl hydrazine was significantly inhibited, suggesting that AA may affect the INAH-hepatitis. By the addition of inhibitors of cytochrome P-450 like metyrapone and CO, the generation of the radical from Hy decreased, confirming that the radical is formed by the cytochrome P-450 dependent microsome systems. The 4-POBN-trapped radical species generated from Hy was presumed to be the hydrazyl radical by the results of mass spectrometry.

Journal of the Pharmaceutical Society of Japan


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LED総合フォーラム 2022 in 徳島 論文集

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Japanese Journal of Circulation Research


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Nihon Rinsho. Japanese Journal of Clinical Medicine


亜硝酸と一酸化窒素(NO)

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