Dose-response effect of polyphenon-60 from green tea (P60-GT) on hexavalent chromium-induced genotoxic damage and apoptosis in mice.

IF 2.3 4区 医学 Q3 ENVIRONMENTAL SCIENCES
Lourdes Montserrat Hernández-Cortés, Víctor Manuel Mendoza-Núñez, Alda Rocío Ortiz-Muñiz, María Del Carmen García-Rodríguez
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引用次数: 0

Abstract

This study aimed to examine the dose-response effects of polyphenon-60 derived from green tea (P60-GT) on hexavalent chromium [Cr(VI)]-induced genotoxic damage and apoptosis. Male Hsd:ICR mice were divided into 4 groups: (1) Control (vehicle only), (2) P60-GT (15, 30, or 45 mg/kg gavage), (3) Cr(VI) (20 mg/kg of CrO3 intraperitoneally), and (4) P60-GT+CrO3 (P60-GT administered 4 hr before CrO3). Peripheral blood samples were collected at 24, 48, and 72 hr to assess the number of micronuclei (MN), apoptosis, and cell viability, while plasma 8-hydroxy-2'-deoxyguanosine (8-OHdG) levels were measured at 0 and 48 hr. Cr(VI) significantly increased MN frequency, suppressed 8-OHdG repair, and reduced cell viability. Pre-treatment with P60-GT reduced MN frequency by up to 74%, with the 30 mg/kg dose demonstrating the highest efficacy. This dose restored cell viability, enhanced 8-OHdG repair, and enhanced apoptosis, suggesting activation of DNA repair and apoptotic pathways as potential antigenotoxic mechanisms. The 15 mg/kg dose exhibited anti-apoptotic effects, while the 30 and 45 mg/kg doses promoted apoptosis. However, the 45 mg/kg dose resulted in 100% lethality by 72 hr, likely due to synergistic toxicity with Cr(VI). These findings demonstrate the dose-dependent protective effects of P60-GT and emphasize the need for dosage optimization to maximize therapeutic benefits while minimizing toxicity.

绿茶多酚60 (P60-GT)对六价铬致小鼠基因毒性损伤和细胞凋亡的量效效应
本研究旨在探讨绿茶多酚60 (P60-GT)对六价铬[Cr(VI)]诱导的基因毒性损伤和细胞凋亡的剂量效应。雄性Hsd:ICR小鼠分为4组:(1)对照组(只给药),(2)P60-GT(灌胃15、30或45 mg/kg), (3) Cr(VI)(腹腔注射20 mg/kg的CrO3), (4) P60-GT+CrO3 (P60-GT在cr3前4小时给药)。在24、48和72小时采集外周血样本,评估微核(MN)数量、细胞凋亡和细胞活力,同时在0和48小时测量血浆8-羟基-2′-脱氧鸟苷(8-OHdG)水平。Cr(VI)显著增加MN频率,抑制8-OHdG修复,降低细胞活力。P60-GT预处理可使MN频率降低74%,其中30 mg/kg剂量效果最佳。该剂量恢复了细胞活力,增强了8-OHdG修复,并促进了细胞凋亡,表明DNA修复和凋亡途径的激活是潜在的抗基因毒性机制。15 mg/kg剂量具有抗凋亡作用,30和45 mg/kg剂量具有促进细胞凋亡的作用。然而,45 mg/kg的剂量在72小时内导致100%的致死率,可能是由于与Cr(VI)的协同毒性。这些发现证明了P60-GT的剂量依赖性保护作用,并强调需要优化剂量以最大化治疗效益,同时最小化毒性。
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来源期刊
CiteScore
5.20
自引率
19.20%
发文量
46
审稿时长
8-16 weeks
期刊介绍: The Journal of Toxicology and Environmental Health, Part A , Current Issues is an authoritative journal that features strictly refereed original research in the field of environmental sciences, public and occupational health, and toxicology.
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