A mechanism for the formation of bis‐glutathione conjugates of propargyl alcohol

Banijamali, Ali R.; Dematteo, Vincent; Sumner, Susan J.

doi:10.1002/ps.641

Cited by 1 publication

(2 citation statements)

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“…Allyl alcohol-induced hepatotoxicity is known to be mediated by a reactive metabolite, acrolein, which is formed via catalytic oxidation of allyl alcohol by alcohol dehydrogenase (ADH). Similar to allyl alcohol, the toxicity of PA is hypothesized to be due to metabolism to the more reactive and mutagenic aldehyde, propargylaldehyde or propioaldehyde (Banijamali et al 2003; Basu and Marnett 1984; Moridani et al 2001). However, propargyl alcohol is a relatively poor substrate for ADH and is mainly metabolized by CYP2E1 (Moridiani MY et.al., 2001).…”

Section: Discussionmentioning

confidence: 99%

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Evaluation of propargyl alcohol toxicity and carcinogenicity in F344/N rats and B6C3F1/N mice following whole-body inhalation exposure

et al. 2013

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Propargyl alcohol (PA) is a high production volume chemical used in synthesis of many industrial chemicals and agricultural products. Despite the potential for prolonged or accidental exposure to PA in industrial settings, the toxicity potential of PA was not well characterized. To address the knowledge gaps relevant to the toxicity profile of PA, the National Toxicology Program (NTP) conducted 2-week, 14-week and 2-year studies in male and female F344/N rats and B6C3F1/N mice. For the 2-week inhalation study, the rats and mice were exposed to 0, 31.3, 62.5, 125, 250 or 500 ppm. Significant mortality was observed in both rats and mice exposed to ≥ 125 ppm of PA. The major target organ of toxicity in both mice and rats was the liver with exposure-related histopathological changes (250 and 500 ppm). Based on the decreased survival in the 2-week study, the rats and mice were exposed to 0, 4, 8, 16, 32 or 64 ppm of PA in the 14-week study. No treatment-related mortality was observed. Mean body weights of male (≥ 8 ppm) and female mice (32 and 64 ppm) were significantly decreased (7–16%). Histopathological changes were noted in the nasal cavity, and included suppurative inflammation, squamous metaplasia, hyaline droplet accumulation, olfactory epithelium atrophy, and necrosis. In the 2-year inhalation studies, the rats were exposed to 0, 16, 32 and 64 ppm of PA and the mice were exposed to 0, 8, 16 and 32 ppm of PA. Survival of male rats was significantly reduced (32 ppm and 64 ppm). Mean body weights of 64 ppm male rats were significantly decreased relative to the controls. Both mice and rats showed a spectrum of non-neoplastic changes in the nose. Increased neoplastic incidences of nasal respiratory/transitional epithelial adenoma were observed in both rats and mice. The incidence of mononuclear cell leukemia was significantly increased in male rats. In conclusion, the key findings from this study indicated that the nose was the primary target organ of toxicity for PA. Long term inhalation exposure to PA led to nonneoplastic changes in the nose, and increased incidences of respiratory/transitional epithelial adenomas in both mice and rats. Increased incidences of harderian gland adenoma may also have been related to exposure to PA in male mice.

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Section: Discussionmentioning

confidence: 99%

“…Each molecule of propargylaldehyde can react with two molecules of glutathione, which potentially can lead to depletion of glutathione more rapidly than allyl alcohol. Also, numerous other metabolites of PA with unknown biological activity have been identified (Banijamali et al 2003; Dix et al 2001). …”

Section: Discussionmentioning

confidence: 99%