Fucoxanthin regulates Nrf2/Keap1 signaling to alleviate myocardial hypertrophy in diabetic rats.
10.12122/j.issn.1673-4254.2022.05.18
- Author:
Dong Xiao ZHENG
1
;
Lin Lin CHEN
1
;
Qi Hui WEI
1
;
Zi Ran ZHU
1
;
Zi Lue LIU
1
;
Lin JIN
1
;
Guan Yu YANG
1
;
Xi XIE
1
Author Information
1. School of Pharmaceutical Sciences, Hainan University, Haikou 570228, China.
- Publication Type:Randomized Controlled Trial, Veterinary
- Keywords:
Nrf2/Keap1;
diabetic cardiomyopathy;
fucoxanthin;
oxidative stress
- MeSH:
Animals;
Antioxidants/metabolism*;
Atrial Natriuretic Factor/pharmacology*;
Cardiomegaly;
Diabetes Mellitus, Experimental/metabolism*;
Fibrosis;
Kelch-Like ECH-Associated Protein 1/metabolism*;
Metformin;
NF-E2-Related Factor 2/metabolism*;
Oxidative Stress;
RNA, Messenger/metabolism*;
Rats;
Reactive Oxygen Species/metabolism*;
Superoxide Dismutase-1/pharmacology*;
Xanthophylls
- From:
Journal of Southern Medical University
2022;42(5):752-759
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVE:To investigate the protective effect of fucoxanthin (FX) against diabetic cardiomyopathy and explore the underlying mechanism.
METHODS:Rat models of diabetes mellitus (DM) induced by intraperitoneal injection of streptozotocin (60 mg/kg) were randomized into DM model group, fucoxanthin treatment (DM+FX) group and metformin treatment (DM+ Met) group, and normal rats with normal feeding served as the control group. In the two treatment groups, fucoxanthin and metformin were administered after modeling by gavage at the daily dose of 200 mg/kg and 230 mg/kg, respectively for 12 weeks, and the rats in the DM model group were given saline only. HE staining was used to examine the area of cardiac myocyte hypertrophy in each group. The expression levels of fibrotic proteins TGF-β1 and FN proteins in rat hearts were detected with Western blotting. In the cell experiment, the effect of 1 μmol/L FX on H9C2 cell hypertrophy induced by exposure to high glucose (HG, 45 mmol/L) was evaluated using FITC-labeled phalloidin. The mRNA expression levels of the hypertrophic factors ANP, BNP and β-MHC in H9C2 cells were detected using qRT-PCR. The protein expressions of Nrf2, Keap1, HO-1 and SOD1 proteins in rat heart tissues and H9C2 cells were determined using Western blotting. The DCFH-DA probe was used to detect the intracellular production of reactive oxygen species (ROS).
RESULTS:In the diabetic rats, fucoxanthin treatment obviously alleviated cardiomyocyte hypertrophy and myocardial fibrosis, increased the protein expressions of Nrf2 and HO-1, and decreased the protein expressions of Keap1 in the heart tissue (P < 0.05). In H9C2 cells with HG exposure, fucoxanthin significantly inhibited the enlargement of cell surface area, lowered the mRNA expression levels of ANP, BNP and β-MHC (P < 0.05), promoted Nrf2 translocation from the cytoplasm to the nucleus, and up-regulated the protein expressions its downstream targets SOD1 and HO-1 (P < 0.05) to enhance cellular antioxidant capacity and reduce intracellular ROS production.
CONCLUSION:Fucoxanthin possesses strong inhibitory activities against diabetic cardiomyocyte hypertrophy and myocardial fibrosis and is capable of up-regulating Nrf2 signaling to promote the expression of its downstream antioxidant proteins SOD1 and HO-1 to reduce the level of ROS.
