Fatty liver in men is associated with high serum levels of small, dense low-density lipoprotein cholesterol

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Aims Our study addressed potential associations between fatty liver and small, dense low-density lipoprotein cholesterol (sd-LDL-C) levels using a cross-sectional analysis. Methods We enrolled 476 male subjects. Serum sd-LDL-C concentrations were determined using precipitation assays. Results Subjects were divided into four groups based on triglyceride (TG) and LDL-C levels: A, TG < 150 mg/dl and LDL-C < 140 mg/dl; B, TG < 150 mg/dl and LDL-C ≥ 140 mg/dl; C, TG ≥ 150 mg/dl and LDL-C < 140 mg/dl; and D, TG ≥ 150 mg/dl and LDL-C ≥ 140 mg/dl. sd-LDL-C levels and the prevalence of fatty liver were significantly higher in groups B, C, and D than in group A. Subjects were also categorized into four groups based on serum sd-LDL-C levels; the prevalence of fatty liver significantly increased with increasing sd-LDL-C levels. Additionally, logistic regression analysis revealed an independent association between sd-LDL-C concentrations and fatty liver using such potential confounders as obesity and hyperglycemia as variables independent of elevated TG or LDL-C levels. Conclusions Fatty liver is a significant determinant of serum sd-LDL-C levels independent of the presence of obesity or hyperglycemia. Fatty liver may alter hepatic metabolism of TG and LDL-C, resulting in increased sd-LDL-C levels.

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Publié le 01 janvier 2012
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Hosoyamadaet al. Diabetology & Metabolic Syndrome2012,4:34 http://www.dmsjournal.com/content/4/1/34
DIABETOLOGY&METABOLIC SYNDROME
R E S E A R C HOpen Access Fatty liver in men is associated with high serum levels of small, dense lowdensity lipoprotein cholesterol 1 21* 11,2 3 Kaori Hosoyamada , Hirofumi Uto , Yasushi Imamura, Yasunari Hiramine , Eriko Toyokura, Yoshihiro Hidaka , 4 45 22 2 Tomomi Kuwahara , Ken Kusano , Kazuto Saito , Makoto Oketani , Akio Idoand Hirohito Tsubouchi
Abstract Aims:Our study addressed potential associations between fatty liver and small, dense lowdensity lipoprotein cholesterol (sdLDLC) levels using a crosssectional analysis. Methods:We enrolled 476 male subjects. Serum sdLDLC concentrations were determined using precipitation assays. Results:Subjects were divided into four groups based on triglyceride (TG) and LDLC levels: A, TG<150 mg/dl and LDLC<140 mg/dl; B, TG<150 mg/dl and LDLC140 mg/dl; C, TG150 mg/dl and LDLC<140 mg/dl; and D, TG150 mg/dl and LDLC140 mg/dl. sdLDLC levels and the prevalence of fatty liver were significantly higher in groups B, C, and D than in group A. Subjects were also categorized into four groups based on serum sdLDLC levels; the prevalence of fatty liver significantly increased with increasing sdLDLC levels. Additionally, logistic regression analysis revealed an independent association between sdLDLC concentrations and fatty liver using such potential confounders as obesity and hyperglycemia as variables independent of elevated TG or LDLC levels. Conclusions:Fatty liver is a significant determinant of serum sdLDLC levels independent of the presence of obesity or hyperglycemia. Fatty liver may alter hepatic metabolism of TG and LDLC, resulting in increased sdLDLC levels. Keywords:Small dense lowdensity lipoprotein, Fatty liver, Type 2 diabetes mellitus, Metabolic syndrome
Introduction Atherogenic lipid profiles in patients with metabolic syn drome or glucose intolerance are characterized by hyper triglyceridemia, elevated apolipoprotein B levels, reduced highdensity lipoprotein cholesterol (HDLC) concentra tions, and an increased proportion of small, dense low density lipoprotein (sdLDL) particles [13]. Compared with large LDL, sdLDL particles show increased pene tration of the arterial wall, lower affinity for the LDL re ceptor, longer halflife in plasma, greater susceptibility to glycation, and lower resistance to oxidative stress, sug gesting that sdLDL is highly atherogenic [4,5]. Indeed,
* Correspondence: yasushii@po.synapse.ne.jp 1 Department of Internal Medicine, Kagoshima Kouseiren Hospital, 2225 Tenpozancho, Kagoshima 8900061, Japan Full list of author information is available at the end of the article
patients with high levels of sdLDL particles were shown to have an approximately 3fold increase in the risk of developing coronary heart disease compared with indivi duals with primarily large, buoyant LDL particles [6]. In addition, the sdLDLC concentration has been suggested to be a better surrogate marker than the LDLC con centration for the severity of coronary heart disease [7]. The presence of fatty liver is an independent predictor of coronary heart disease [810]. In addition, fatty liver is a manifestation of metabolic syndrome, and is associated with obesity, type 2 diabetes mellitus (T2DM), and hypertriglyceridemia [11]. In patients with T2DM or metabolic syndrome, fatty liver may enhance atherogen esis by increasing levels of sdLDL particles [12,13]. The precise role of fatty liver in the pathogenesis of sdLDL, however, is still unclear. In the present study, we
© 2012 Hosoyamada et al.; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.