Carcinogenesis, Teratogenesis & Mutagenesis ›› 2021, Vol. 33 ›› Issue (1): 22-27.doi: 10.3969/j.issn.1004-616x.2021.01.005

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Hepatotoxicity of 2,4-dichlorophenoxyacetic acid in young SD rats

HUANG Lili1, ZHANG Mengyun2, LIU Keliang3, PANG Dingguo1, LIU Lida3, XU Peiyu1,   

  1. 1. Department of Toxicology and Pathology, West China School of Public Health, Sichuan University, Chengdu 610041, Sichuan;
    2. Department of Toxicology, Suzhou Ribo Life Science Limited Liability Company, Beijing 100085;
    3. Department of Toxicology, Sichuan Provincial Center for Disease Control and Prevention, Chengdu 610041, Sichuan, China
  • Received:2020-11-08 Revised:2020-12-31 Online:2021-01-30 Published:2021-02-06

Abstract: OBJECTIVE: To investigate the hepatotoxicity of 2, 4dichlorophenoxyacetic acid in young SD rats. METHODS: 64 young SD rats with SPF grade were randomly divided into three 2, 4-D inoculation groups (18.125, 36.250, 72.500 mg/kg) and a solvent control group (1% carboxymethyl cellulose). The rats were inoculated with the chemicals orally once a day for 28 days. After the exposure, their general behavior and weight changes were monitored, wet weights and viscera coefficients of the livers were calculated. Pathology of the livers were determined after their staining with hematoxylin-Eosin (HE). Activities of glutathione (GSH), total superoxide dismutase (T-SOD) and concentrations of malondialdehyde (MDA) were measured using the DTNB assay, and xanthine oxidase and TBA assays were conducted after liver samples were pretreated. Contents of cytochrome C, relative activities of Caspase-3 and Caspase-9 in liver tissues were determined by spectrophotometer. RESULTS: Compared with the control group, rats from the 72.500 mg/kg treatment group showed the following:body weight gains and liver wet weight were reduced significantly (P < 0.05);parts of the livers had bile duct hyperplasia which were accompanied with inflammatory cell infiltration;GSH activities in the liver homogenates were decreased (P < 0.05);and MDA concentrations were increased (P < 0.05). In rats from both the 36.250 mg/kg and 72.500 mg/kg treatment groups, the activities of TSOD were decreased (P < 0.05); cytochrome C concentrations were increased (P < 0.05); and the relative activities of caspase-3 and caspase-9 were increased (P < 0.05). CONCLUSION: Under the conditions of this investigation, 2, 4-D was shown to induce hepatotoxicity in young SD rats. The toxicity was probably mediated by changing mitochondrial membrane permeability and releasing apoptotic factor to induce hepatocyte apoptosis, thereby causing oxidative damage to hepatocytes.

Key words: 2,4-dichlorophenoxyacetic acid, hepatotoxicity, apoptosis, oxidative damage

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