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Zhang Z, Chen J, Zhou S, Wang S, Cai X, Conklin DJ, Kim KS, Kim KH, Tan Y, Zheng Y, Kim YH, Cai L. Magnolia bioactive constituent 4-O-methylhonokiol prevents the impairment of cardiac insulin signaling and the cardiac pathogenesis in high-fat diet-induced obese mice. Int J Biol Sci 2015; 11:879-91. [PMID: 26157343 PMCID: PMC4495406 DOI: 10.7150/ijbs.12101] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Accepted: 05/13/2015] [Indexed: 12/16/2022] Open
Abstract
In obesity, cardiac insulin resistance is a putative cause of cardiac hypertrophy and dysfunction. In our previous study, we observed that Magnolia extract BL153 attenuated high-fat-diet (HFD)-induced cardiac pathogenic changes. In this study, we further investigated the protective effects of the BL153 bioactive constituent, 4-O-methylhonokiol (MH), against HFD-induced cardiac pathogenesis and its possible mechanisms. C57BL/6J mice were fed a normal diet or a HFD with gavage administration of vehicle, BL153, or MH (low or high dose) daily for 24 weeks. Treatment with MH attenuated HFD-induced obesity, as evidenced by body weight gain, and cardiac pathogenesis, as assessed by the heart weight and echocardiography. Mechanistically, MH treatment significantly reduced HFD-induced impairment of cardiac insulin signaling by preferentially augmenting Akt2 signaling. MH also inhibited cardiac expression of the inflammatory factors tumor necrosis factor-α and plasminogen activator inhibitor-1 and increased the phosphorylation of nuclear factor erythroid-derived 2-like 2 (Nrf2) as well as the expression of a Nrf2 downstream target gene heme oxygenase-1. The increased Nrf2 signaling was associated with decreased oxidative stress and damage, as reflected by lowered malondialdehyde and 3-nitrotyrosine levels. Furthermore, MH reduced HFD-induced cardiac lipid accumulation along with lowering expression of cardiac fatty acid translocase/CD36 protein. These results suggest that MH, a bioactive constituent of Magnolia, prevents HFD-induced cardiac pathogenesis by attenuating the impairment of cardiac insulin signaling, perhaps via activation of Nrf2 and Akt2 signaling to attenuate CD36-mediated lipid accumulation and lipotoxicity.
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Affiliation(s)
- Zhiguo Zhang
- 1. Department of Cardiology at the First Hospital of Jilin University, Changchun, 130021, China ; 2. The Chinese-American Research Institute for Diabetic Complications and the Second Affiliated Hospital, Wenzhou Medical University, Wenzhou 325035, China ; 3. Kosair Children's Hospital Research Institute, Department of Pediatrics of University of Louisville, Louisville, KY 40202
| | - Jing Chen
- 3. Kosair Children's Hospital Research Institute, Department of Pediatrics of University of Louisville, Louisville, KY 40202
| | - Shanshan Zhou
- 1. Department of Cardiology at the First Hospital of Jilin University, Changchun, 130021, China ; 2. The Chinese-American Research Institute for Diabetic Complications and the Second Affiliated Hospital, Wenzhou Medical University, Wenzhou 325035, China ; 3. Kosair Children's Hospital Research Institute, Department of Pediatrics of University of Louisville, Louisville, KY 40202
| | - Shudong Wang
- 1. Department of Cardiology at the First Hospital of Jilin University, Changchun, 130021, China ; 2. The Chinese-American Research Institute for Diabetic Complications and the Second Affiliated Hospital, Wenzhou Medical University, Wenzhou 325035, China ; 3. Kosair Children's Hospital Research Institute, Department of Pediatrics of University of Louisville, Louisville, KY 40202
| | - Xiaohong Cai
- 2. The Chinese-American Research Institute for Diabetic Complications and the Second Affiliated Hospital, Wenzhou Medical University, Wenzhou 325035, China
| | - Daniel J Conklin
- 4. Diabetes and Obesity Center, University of Louisville, Louisville, KY 40202
| | - Ki-Soo Kim
- 5. Bioland Biotec HaiMen Co., Ltd, Linjiang New District, Haomen, 226100, China
| | - Ki Ho Kim
- 6. KHBios, 505 Venture Center, 194-41, Osongsaengmyeong 1, Osong, Cheongju, Chungbuk 363-951, Republic of Korea
| | - Yi Tan
- 2. The Chinese-American Research Institute for Diabetic Complications and the Second Affiliated Hospital, Wenzhou Medical University, Wenzhou 325035, China ; 3. Kosair Children's Hospital Research Institute, Department of Pediatrics of University of Louisville, Louisville, KY 40202
| | - Yang Zheng
- 1. Department of Cardiology at the First Hospital of Jilin University, Changchun, 130021, China
| | - Young Heui Kim
- 7. Bioland R&D Center, 59 Songjeongni 2-gil, Byeongcheon, Dongnam, Cheonan, Chungnam 330-863, Republic of Korea
| | - Lu Cai
- 2. The Chinese-American Research Institute for Diabetic Complications and the Second Affiliated Hospital, Wenzhou Medical University, Wenzhou 325035, China ; 3. Kosair Children's Hospital Research Institute, Department of Pediatrics of University of Louisville, Louisville, KY 40202
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