Abstract:
:Cimetidine is a histamine H2-receptor antagonist used for treatment of gastrointestinal disorders. It is often detected in aquatic environments, but its ecotoxicological effects have not been well studied. Thus, ecotoxicity of cimetidine was evaluated using Daphnia magna and Moina macrocopa, and zebrafish (Danio rerio), and a predicted no effect concentration (PNEC) was derived. In D. magna, 48 h immobilization EC50 was determined at 394.9 mg L(-1). However, reproduction damages in D. magna were not found even at the maximum exposure level (30 mg L(-1)). For M. macrocopa, 48 h EC50 was found at 175.8 mg L(-1) and the 7 d reproduction no observed effect concentration (NOEC) was 1.1 mg L(-1). For D. rerio, 40 d growth NOEC was determined at 100 mg L(-1), the highest experimental concentration. The PNEC of cimetidine was estimated at 0.1 mg L(-1) based on M. macrocopa 7d reproduction NOEC. In 14 d adult zebrafish exposure, endocrine disruption potentials of cimetidine were observed. In male, decrease in plasma 17β-estradiol and testosterone levels, up-regulation of gonadal cyp17, and down-regulation of hepatic erα were observed at 300 mg L(-1). In female, increase in plasma E2 level and down-regulation of hepatic cyp1a were noted at 3 mg L(-1). Endocrine disruption effects were also observed in early life stage exposure. Up-regulation of erβ at 17d, and cyp19a and vtg at 40 d post fertilization were detected at 100 mg L(-1), and co-occurrence of ovary and putative testis was observed at as low as 1.1 mg L(-1). The results indicate that there is little evidence for cimetidine to cause direct ecological impact at the current ambient levels in the aquatic environment. However potential consequences of endocrine disruption following long-term exposure in aquatic environment deserves further investigation.
journal_name
Chemospherejournal_title
Chemosphereauthors
Lee S,Jung D,Kho Y,Ji K,Kim P,Ahn B,Choi Kdoi
10.1016/j.chemosphere.2015.04.033subject
Has Abstractpub_date
2015-09-01 00:00:00pages
208-16eissn
0045-6535issn
1879-1298pii
S0045-6535(15)00372-0journal_volume
135pub_type
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