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      Methylophiopogonanone A, an Ophiopogon homoisoflavonoid, alleviates high-fat diet-induced hyperlipidemia: assessment of its potential mechanism

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          Abstract

          Methylophiopogonanone A (MO-A), a homoisoflavonoid extracted from Ophiopogon japonicus, has been shown to attenuate myocardial apoptosis and improve cerebral ischemia/reperfusion injury. However, the hypolipidemic effects remain unknown. This study was performed to investigate a potential hypolipidemic effect of MO-A in hyperlipidemia rats, as well as its underlying mechanism of action. A rat model of hyperlipidemia was induced by a high-fat diet (HFD). Animals were randomly divided into three groups (n=8/group): normal control group (NC), HFD group, and HFD+MO-A (10 mg·kg -1·d -1) treatment group. The effects of MO-A on serum lipids, body weight, activity of lipoprotein metabolism enzyme, and gene expression of lipid metabolism were evaluated in HFD-induced rats. In HFD-induced rats, pretreatment with MO-A decreased the body weight gain and reduced serum and hepatic lipid levels. In addition, pretreatment with MO-A improved the activities of lipoprotein lipase and hepatic lipase in serum and liver, down-regulated mRNA expression of acetyl CoA carboxylase and sterol regulatory element-binding protein 1c, and up-regulated mRNA expression of low-density lipoprotein receptor and peroxisome proliferator-activated receptor α in the liver. Our results indicated that MO-A showed strong ability to ameliorate the hyperlipidemia in HFD-induced rats. MO-A might be a potential candidate for prevention of overweight and dyslipidemia induced by HFD.

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          Most cited references 33

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          Postprandial hyperglycemia/hyperlipidemia (postprandial dysmetabolism) is a cardiovascular risk factor.

          Epidemiologic data indicate that a postprandial state characterized by abnormally increased levels of glucose and lipids (also referred to as postprandial dysmetabolism) is an independent predictor of future cardiovascular events, even in nondiabetic subjects. The cardiovascular toxicity of postprandial dysmetabolism is mediated by oxidant stress, which is directly proportional to the increase in glucose after a meal. This transient increase in free radicals acutely triggers inflammation, endothelial dysfunction, hypercoagulability, sympathetic hyperactivity, and a cascade of other atherogenic changes. The postprandial dysmetabolism hypothesis has been bolstered by interventional studies that have demonstrated that blunting the postprandial spikes in glucose and lipids improves inflammation and endothelial function immediately. Early randomized controlled trials indicate that reducing postprandial dysmetabolism appears to significantly slow atherosclerotic progression and may improve cardiovascular prognosis. In conclusion, postprandial dysmetabolism appears to be an important proximate cause of adverse cardiovascular events. Addressing this fundamental and largely unrecognized condition will require specific screening and treatment strategies. Diet, exercise, and various pharmacologic agents can improve postprandial dysmetabolism. Using these strategies may help improve the prognosis for patients with diabetes mellitus and/or coronary heart disease.
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            New insights into the pathophysiology of dyslipidemia in type 2 diabetes.

            Cardiovascular disease (CVD) remains the leading cause of morbidity and mortality for patients with type 2 diabetes, despite recent significant advances in management strategies to lessen CVD risk factors. A major cause is the atherogenic dyslipidemia, which consists of elevated plasma concentrations of both fasting and postprandial triglyceride-rich lipoproteins (TRLs), small dense low-density lipoprotein (LDL) and low high-density lipoprotein (HDL) cholesterol. The different components of diabetic dyslipidemia are not isolated abnormalities but closely linked to each other metabolically. The underlying disturbances are hepatic overproduction and delayed clearance of TRLs. Recent results have unequivocally shown that triglyceride-rich lipoproteins and their remnants are atherogenic. To develop novel strategies for the prevention and treatment of dyslipidaemia, it is essential to understand the pathophysiology of dyslipoproteinaemia in humans. Here, we review recent advances in our understanding of the pathophysiology of diabetic dyslipidemia.
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              PPARalpha in atherosclerosis and inflammation.

              Peroxisome proliferator-activated receptor (PPAR)alpha is a nuclear receptor activated by natural ligands such as fatty acids as well as by synthetic ligands such as fibrates currently used to treat dyslipidemia. PPARalpha regulates the expression of genes encoding proteins that are involved in lipid metabolism, fatty acid oxidation, and glucose homeostasis, thereby improving markers for atherosclerosis and insulin resistance. In addition, PPARalpha exerts anti-inflammatory effects both in the vascular wall and the liver. Here we provide an overview of the mechanisms through which PPARalpha affects the initiation and progression of atherosclerosis, with emphasis on the modulation of atherosclerosis-associated inflammatory responses. PPARalpha activation interferes with early steps in atherosclerosis by reducing leukocyte adhesion to activated endothelial cells of the arterial vessel wall and inhibiting subsequent transendothelial leukocyte migration. In later stages of atherosclerosis, evidence suggests activation of PPARalpha inhibits the formation of macrophage foam cells by regulating expression of genes involved in reverse cholesterol transport, formation of reactive oxygen species (ROS), and associated lipoprotein oxidative modification among others. Furthermore, PPARalpha may increase the stability of atherosclerotic plaques and limit plaque thrombogenicity. These various effects may be linked to the generation of PPARalpha ligands by endogenous mechanisms of lipoprotein metabolism. In spite of this dataset, other reports implicate PPARalpha in responses such as hypertension and diabetic cardiomyopathy. Although some clinical trials data with fibrates suggest that fibrates may decrease cardiovascular events, other studies have been less clear, in terms of benefit. Independent of the clinical effects of currently used drugs purported to achieve PPARalpha, extensive data establish the importance of PPARalpha in the transcriptional regulation of lipid metabolism, atherosclerosis, and inflammation.
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                Author and article information

                Journal
                Braz J Med Biol Res
                Braz. J. Med. Biol. Res
                bjmbr
                Brazilian Journal of Medical and Biological Research
                Associação Brasileira de Divulgação Científica
                0100-879X
                1414-431X
                02 March 2020
                2020
                : 53
                : 3
                Affiliations
                Center for Translational Medicine of the First Affiliated Hospital, Sun Yatsen University, Guangzhou, China
                Author notes
                Correspondence: Bei-Xin Yu: < yubx3@ 123456mail2.sysu.edu.cn >
                Article
                00609
                10.1590/1414-431X20199201
                7057930
                32130294

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                Page count
                Figures: 9, Tables: 2, Equations: 0, References: 31
                Categories
                Research Article

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