Acta Veterinaria et Zootechnica Sinica ›› 2024, Vol. 55 ›› Issue (4): 1787-1799.doi: 10.11843/j.issn.0366-6964.2024.04.040

• CLINICAL VETERINARY MEDICINE • Previous Articles     Next Articles

Effect of Asiatic Acid Alleviating Myocardial Injury Caused by Lipopolysaccharide through Inhibiting Oxidative Stress and Ferroptosis in Broilers

ZHANG Xinting1, QIU Wenyue1, PANG Xiaoyue1, SU Yiman1, YE Jiali1, HUANG Jianjia1, ZHOU Shuilian1, TANG Zhaoxin1, WANG Rongmei2, SU Rongsheng1*   

  1. 1. College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China;
    2. Yingdong College of Biology and Agriculture, Shaoguan University, Shaoguan 512005, China
  • Received:2023-07-03 Online:2024-04-23 Published:2024-04-26

Abstract: This experiment was conducted to investigate the effects of different concentrations of asiatic acid (AA)on lipopolysaccharide (LPS)-induced acute myocardial injury (AMI) in broilers. All 50 broilers were selected to be reared to 7 days of age, and then divided into 5 groups, namely Control group, LPS group, LPS+AA 15 mg·kg-1 group, LPS+AA 30 mg·kg-1 group, LPS+AA 60 mg·kg-1 group. At 7 days of age, all the AA groups were pretreated with corresponding doses of AA by gavage for 14 consecutive days. At 16, 18 and 20 days of age, all the LPS groups were intraperitoneally injected with 0.5 mg·kg-1 LPS to induce AMI. Myocardial samples of broilers were collected at the age of 21 days. Histopathological changes of myocardium were observed by hematoxylin-eosin(HE)staining; Detection of markers of oxidative stress in myocardial tissue using glutathione peroxidase (GSH-Px)and malondialdehyde (MDA)kits; Real-time fluorescence PCR(qRT-PCR)and Western blot were used to detect the expression of genes and proteins related to oxidative stress and ferroptosis in myocardial tissues. The positive expression rate of Nrf2 and SLC7A11 in myocardial tissues was detected by immunohistochemistry. The positive expression rate of GPX4 in myocardial tissues was detected by immunofluorescence. The results showed that AA pretreatment alleviated the myocarial injury induced by LPS. Compared with LPS group, medium-dose AA pretreatment increased GSH-Px activity while all AA pretreatment decreased MDA content in myocardium significantly (P < 0.05 or P < 0.01). Importantly, AA pretreatment decreased the mRNA expression of Keap1, PTGS2 and HMGB1, and increased the expression of Nrf2, HO-1, NQO1, FTH1, SLC7A11, GPX4, GCLC and GCLM (P < 0.05 or P < 0.01). AA pretreatment also decreased the protein expression of Keap1 and HMGB1, promoted the protein expression of Nrf2, HO-1, NQO1, FTH1 and GPX significantly (P < 0.05). Immunohistochemistry and immunofluorescence results showed that AA pretreatment could significantly increased the expression of Nrf2 (P < 0.01), SLC7A11 (P < 0.01) and GPX (P < 0.01). The results of the current study showed for the first time that AA could alleviate LPS-induced AMI by regulating oxidative stress and ferroptosis. AA is expected to be a potential food additive for preventing LPS-induced AMI in broilers in the future.

Key words: asiatic acid, acute myocardial injury, lipopolysaccharide, oxidative stress, ferroptosis

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