Abstract
Aims
Oxidative stress has been considered to contribute to the development of obesity-related metabolic disorders including insulin resistance. To the contrary, deficiency of an anti-oxidizing enzyme, glutathione peroxidase (GPx)-1, was reported to enhance insulin signaling, suggesting that oxidative stress may inhibit the development of type 2 diabetes. However, the beneficial effects of the absence of GPx-1 in metabolic homeostasis, including body weight control, have not yet been clearly manifested. To clarify the relationship between oxidative stress and obesity-related metabolic disorders, we investigated another mouse deficient with both GPx-1 and catalase (Cat).
Methods
C57BL/6J wild-type and GPx-1−/− × Cat−/− mice were fed with a high-fat diet (60% fat) or a normal chow diet for 16 weeks and were investigated for metabolic and histological studies.
Results
Body weight gain was significantly reduced, and glucose metabolism as well as hepatic steatosis was obviously improved in the GPx-1−/− × Cat−/− mice. The serum levels of insulin and total cholesterol were also significantly lowered. For the underlying mechanism, inflammation was attenuated and expression of markers for fat browning was enhanced in the visceral white adipose tissues.
Conclusions
Oxidative stress due to deficiency of GPx-1 and Cat may improve obesity-related metabolic disorders through attenuation of inflammation and fat browning.
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Funding
This study was supported by a grant from Korean Health Technology R&D Project, Ministry of Health & Welfare, Republic of Korea (HI12C0050).
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All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted (Institutional Animal Care and Use Committee of Ewha Womans University Graduate School of Medicine, Permit Number: 10-0133).
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Kim, HR., Choi, EJ., Kie, JH. et al. Deficiency of glutathione peroxidase-1 and catalase attenuated diet-induced obesity and associated metabolic disorders. Acta Diabetol 57, 151–161 (2020). https://doi.org/10.1007/s00592-019-01388-5
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DOI: https://doi.org/10.1007/s00592-019-01388-5