Betulin ameliorates 7,12-dimethylbenz(a)anthracene-induced rat mammary cancer by modulating MAPK and AhR/Nrf-2 signaling pathway

被引:13
|
作者
Zhang, Jinku [1 ]
Zhou, Bingjuan [1 ]
Sun, Jirui [1 ]
Chen, Hong [1 ]
Yang, Zhao [2 ]
机构
[1] Baoding First Cent Hosp, Dept Pathol, Baoding, Hebei, Peoples R China
[2] Beijing Univ Chem Technol, Coll Life Sci & Technol, 15 East North Third Ring Rd, Beijing 100029, Peoples R China
关键词
7,12-dimethylbenz(a)anthracene; antioxidant; betulin; mammary cancer; oxidative stress; ARYL-HYDROCARBON RECEPTOR; BREAST-CANCER; OXIDATIVE STRESS; SUPEROXIDE-DISMUTASE; LIPID-PEROXIDATION; IN-VIVO; ASSAY; OVEREXPRESSION; TANGERETIN; EXPRESSION;
D O I
10.1002/jbt.22779
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The aim of the present study is to explore the preventive efficacy of betulin (BE) in 7,12-dimethylbenz(a)anthracene (DMBA)-administered mammary cancer by modulating Ahr/Nrf2 signaling in experimental models. The mammary cancer was stimulated by the addition of DMBA (25 mg/kg/b.Wt) mixed in 1 ml of vehicle solution (sunflower oil and saline 1:1) through subcutaneous injection. The DMBA-exposed mammary tumor models showed low bodyweight, elevated quantities of lipid peroxidation molecules (TBARS and LOOH), and low enzymatic (GPx, SOD, and CAT), and nonenzymatic (GSH, vitamin C, and vitamin E) antioxidant activities in plasma and mammary tissues. Moreover, histopathological studies confirmed that invasive ductal carcinoma was observed in DMBA-induced mammary tissue of the experimental model. Dietary oral supplementation of BE prevents the loss of bodyweight, overproduces lipid peroxidation, and restores the antioxidant activities in DMBA-exposed experimental animals. The nuclear factor erythroid 2-related factor 2 (Nrf2) is a crucial antioxidant protein that involves preventing numerous cancers. Therefore, Nrf2-associated signaling concern is a significant target for preventing mammary cancer. This study observed an increased expression of MAPKs, Keap1, ARNT, AhR, and CYP1A1, whereas decreased expression of HO-1 and Nrf2 in DMBA-induced cancer-bearing experimental animals. The oral supplementation of BE effectively modulates the expression of MAPKs, AhR/Nrf2-associated protein expressions in DMBA-exposed experimental animals. This current study concluded that BE is a strong antioxidant, which triggers the MAPKs-mediated oxidative stress and inhibits proliferative markers by restoring the activity of Nrf2 signaling.
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页数:8
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