中国畜牧兽医 ›› 2026, Vol. 53 ›› Issue (2): 1023-1032.doi: 10.16431/j.cnki.1671-7236.2026.02.045

• 基础兽医 • 上一篇    下一篇

儿茶素通过调控SLC7A11/GPX4通路对脂多糖诱导小鼠乳房炎性损伤的保护作用研究

王琳莹1(), 仝江1(), 张秋云2, 姚欣惠1, 王莉1, 温浩杰1, 苏庆1, 李晓1,3, 童超1, 王学兵1(), 王红利4()   

  1. 1.河南农业大学动物医学院,郑州 450002
    2.郏县红牛产业发展中心,平顶山 467199
    3.河南省高新技术实业有限公司,郑州 450002
    4.郏县动物疫病预防控制中心,平顶山 467199
  • 收稿日期:2025-04-30 出版日期:2026-02-20 发布日期:2026-01-27
  • 通讯作者: 王学兵,王红利 E-mail:wly15515811495@163.com;tongjiang9@163.com;xbwang74@163.com;wanghl5566@163.com
  • 作者简介:王琳莹,E-mail:wly15515811495@163.com
    仝江, E-mail:tongjiang9@163.com
    第一联系人:(王琳莹、仝 江并列第一作者)
  • 基金资助:
    2024年度河南省大学生创新创业训练计划项目(202410466001);河南省科技攻关计划联合基金(235200810051);河南省重大科技专项(231100310200)

Protective Effect of Catechin on LPS-induced Inflammatory Injury in Mouse Mammary Glands via SLC7A11/GPX4 Pathway

WANG Linying1(), TONG Jiang1(), ZHANG Qiuyun2, YAO Xinhui1, WANG Li1, WEN Haojie1, SU Qing1, LI Xiao1,3, TONG Chao1, WANG Xuebing1(), WANG Hongli4()   

  1. 1.College of Veterinary Medicine,Henan Agricultural University,Zhengzhou 450002,China
    2.Jiaxian Red Bull Industry Development Center,Pingdingshan 467199,China
    3.Henan Province High-Tech Industrial Co. ,Ltd. ,Zhengzhou 450002,China
    4.Jiaxian Animal Disease Prevention and Control Center,Pingdingshan 467199,China
  • Received:2025-04-30 Online:2026-02-20 Published:2026-01-27
  • Contact: WANG Xuebing, WANG Hongli E-mail:wly15515811495@163.com;tongjiang9@163.com;xbwang74@163.com;wanghl5566@163.com

摘要:

目的 探究儿茶素对乳房炎小鼠的保护作用,研究谷胱甘肽过氧化物酶4(glutathione peroxidase 4,GPX4)/溶质载体家族7成员11(solute carrier family 7 member 11,SLC7A11)信号通路对铁死亡的调节作用。 方法 选取20只分娩后7~10 d雌性小鼠,采用随机分组法将其分为5组:空白对照组、脂多糖(LPS)造模组、儿茶素低剂量组(40 mg/kg)、儿茶素高剂量组(80 mg/kg)及地塞米松阳性对照组。儿茶素低、高剂量组小鼠按相应剂量浓度灌胃给予儿茶素,其余组小鼠给予同等剂量生理盐水,每只0.3 mL,连续7 d。灌胃完成后,阳性对照组小鼠经腹腔注射100 μL 2 mg/mL地塞米松。2 h后,除空白对照组外,其余各组小鼠于第4对乳头左右侧经乳头乳导管各注射50 μL 0.2 mg/mL LPS建立乳房炎模型。比较造模后各组小鼠的体重变化,通过HE染色观察各组小鼠乳腺组织病理学变化,采用生化试剂盒检测乳腺组织中丙二醛(MDA)含量和超氧化物歧化酶(SOD)活性。利用Western blotting检测小鼠乳腺组织中GPX4、SLC7A11和铁蛋白重链(FTH)蛋白表达量,并采用免疫荧光检测乳腺组织中FTH、GPX4蛋白荧光强度。 结果 与空白对照组相比,LPS组小鼠体重呈下降趋势,而儿茶素处理组小鼠体重表现增加趋势。HE染色结果显示,空白对照组小鼠乳腺腺泡结构完整,未见炎性细胞浸润;LPS组小鼠乳腺腺泡内有大量炎性细胞浸润以及腺泡萎缩;儿茶素高、低剂量组和地塞米松阳性对照组小鼠乳腺损伤明显减轻。与空白对照组相比,LPS组小鼠乳腺组织中MDA含量显著升高、SOD活性显著降低(P<0.05)。与LPS组相比,儿茶素高、低剂量组小鼠乳腺组织中MDA含量显著下降、SOD活性显著升高(P<0.05)。Western blotting结果显示,与空白对照组相比,LPS组小鼠乳腺组织中GPX4、SLC7A11、FTH蛋白表达量均显著下降(P<0.05)。与LPS组相比,儿茶素高、低剂量组小鼠乳腺组织中GPX4、SLC7A11、FTH蛋白表达量显著升高(P<0.05)。免疫荧光检测结果显示,与空白对照组相比,LPS组小鼠乳腺组织中GPX4、FTH蛋白相对荧光强度显著降低(P<0.05)。与LPS组相比,儿茶素高剂量组小鼠乳腺组织中GPX4、FTH蛋白相对荧光强度显著增加(P<0.05)。 结论 儿茶素能显著减轻LPS诱导的小鼠乳房炎损伤,其保护作用与抑制乳房炎小鼠的铁死亡密切相关。儿茶素通过上调SLC7A11表达,增强机体抗氧化能力,进而提高GPX4活性,最终减少MDA积累,从而发挥对铁死亡的抑制作用。

关键词: 儿茶素; 乳房炎; 铁死亡; SLC7A11/GPX4信号通路

Abstract:

Objective This experiment aimed to explore the protective effect of catechin on mice with mastitis, and to study the regulatory role of the glutathione peroxidase 4 (GPX4)/solute carrier family 7 member 11 (SLC7A11) signaling pathway in ferroptosis. Method Twenty female mice that had given birth within 7-10 days were selected and randomly divided into 5 groups: Blank control group, LPS model group, catechin low-dose group (40 mg/kg), catechin high-dose group (80 mg/kg), and dexamethasone positive control group. The mice in low- and high-dose catechin groups were intragastrically administered with catechin at the corresponding concentration, while the mice in other groups were given the same dose of normal saline (0.3 mL per mouse), for 7 days. After the intragastric administration was completed, the mice in positive control group were intraperitoneally injected with 100 μL of 2 mg/mL dexamethasone. Two hours later, except for blank control group, the mice in other groups were injected with 50 μL of 0.2 mg/mL LPS on each side of the fourth pair of nipples through mammary duct to establish the mastitis model. The weight changes of the mice in each group after the modeling were compared. The histological changes of the mammary glands in each group of mice were observed through HE staining. The content of malondialdehyde (MDA) and the activity of superoxide dismutase (SOD) in mammary gland were detected by biochemical kits. The expression levels of GPX4, SLC7A11 and ferritin heavy chain (FTH) proteins in mammary gland were detected by Western blotting. Immunofluorescence was used to detect the fluorescence intensities of FTH and GPX4 proteins. Result Compared with blank control group, the body weight of mice in LPS group showed a downward trend, while the body weight of mice in catechin treatment groups showed an upward trend. HE staining results showed that the mammary gland acini of mice in blank control group were intact and no inflammatory cell infiltration was observed. In LPS group, there was a significant infiltration of inflammatory cells and atrophy of the mammary gland lobules in the mice.These pathological damages were substantially alleviated in both the high- and low-dose catechin groups, as well as in dexamethasone positive control group. Compared with blank control group, the content of MDA in mammary gland of mice in LPS group significantly increased, and the activity of SOD significantly decreased (P<0.05). Compared with LPS group, the content of MDA in mammary gland of mice in high- and low-dose catechin groups significantly decreased, and the activity of SOD significantly increased (P<0.05). Western blotting results showed that compared with blank control group, the expression levels of GPX4, SLC7A11, and FTH proteins in mammary gland of mice in LPS group were significantly decreased (P<0.05).Compared with LPS group, the expression levels of GPX4, SLC7A11, and FTH proteins in mammary gland of mice in high- and low-dose catechin groups were significantly increased (P<0.05). The results of immunofluorescence detection showed that, compared with blank control group, the relative fluorescence intensities of GPX4 and FTH proteins in mammary gland of mice in LPS group significantly decreased (P<0.05). Compared with LPS group, the relative fluorescence intensities of GPX4 and FTH proteins in mammary gland of mice in high-dose catechin group significantly increased (P<0.05). Conclusion Catechins could significantly alleviate the damage caused by LPS-induced mastitis in mice, and the protective effect was closely related to the inhibition of ferroptosis. Catechins enhanced the antioxidant capacity of the body by upregulating the expression of SLC7A11, promoting the activity of GPX4, and ultimately reducing the accumulation of MDA, thereby exerting an inhibitory effect on ferroptosis.

Key words: catechins; mastitis; ferroptosis; SLC7A11/GPX4 signaling pathway

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