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1.
J Cardiovasc Transl Res ; 13(6): 916-927, 2020 12.
Article in English | MEDLINE | ID: mdl-32557321

ABSTRACT

Lower level of low-density lipoprotein cholesterol (LDL-C) is paradoxically associated with increased mortality in ST elevation myocardial infarction (STEMI) patients. The underlying mechanism remains unclear. In a cohort of 220 de novo STEMI patients receiving timely primary percutaneous coronary intervention, admission LDL-C was negatively associated with circulating CD14++CD16+ monocyte counts. Moreover, admission LDL-C < 85 mg/dL was associated with increased risk for major adverse cardiovascular events (MACE) during a median follow-up of 2.7 years. After categorizing the patients according to the cutoff values of 85 mg/dL for LDL-C and the median for CD14++CD16+ monocytes, low LDL-C-associated MACE risk was only observed in those with high CD14++CD16+ monocyte counts (low LDL-C/high CD14++CD16+ monocytes vs. low LDL-C/low CD14++CD16+ monocytes: hazard ratio 5.38, 95% confidence interval 1.52 to 19.06, P = 0.009). This work provided the proof-of-principle evidence indicating a role of CD14++CD16+ monocytes in risk stratification of STEMI patients presenting with low LDL-C level. Graphical abstract.


Subject(s)
Cholesterol, LDL/blood , Lipopolysaccharide Receptors/blood , Monocytes/metabolism , Patient Admission , Receptors, IgG/blood , ST Elevation Myocardial Infarction/blood , Aged , Biomarkers/blood , Female , GPI-Linked Proteins/blood , Humans , Immunity, Innate , Male , Middle Aged , Monocytes/immunology , Percutaneous Coronary Intervention/adverse effects , Proof of Concept Study , Recurrence , Risk Assessment , Risk Factors , ST Elevation Myocardial Infarction/diagnosis , ST Elevation Myocardial Infarction/immunology , ST Elevation Myocardial Infarction/therapy , Time Factors , Treatment Outcome
2.
Blood Press Monit ; 24(5): 234-240, 2019 Oct.
Article in English | MEDLINE | ID: mdl-31469693

ABSTRACT

OBJECTIVE: Pulse pressure is strongly associated with the early development of large-vessel atherosclerotic disease. However, the relationship between pulse pressure and carotid plaque in China is unknown. Thus, we investigated the associations of pulse pressure and mean arterial pressure with the presence of carotid plaques in a low-income population in rural China. PARTICIPANTS AND METHODS: Residents, aged ≥45 years, without histories of stroke or cardiovascular disease were enrolled. Participant demographics, previous medical histories, and lifestyle information were collected; anthropometric measures, serum profiles, and B-mode ultrasonographic investigations were also performed. RESULTS: The mean age of participants (n = 3789) was 59.9 years overall (men 61.1 years; women, 59.1 years). The mean SBP (146.42 mmHg) and DBP (86.81 mmHg), pulse pressures (59.61 mmHg), and mean arterial pressures (106.68 mmHg) were high in this population. The odds ratio (95% confidence interval) for the association of pulse pressure with the presence of carotid plaques was 1.028 (1.023-1.033), in the univariate analysis. After gradual adjustment for demographic features, risk factors, and serum profile measurements, this positive association remained statistically significant (all, P < 0.001). However, there was no significant relationship between mean arterial pressure and the presence of carotid plaques. CONCLUSION: These findings suggest that an elevated pulse pressure is an independent risk factor for the presence of carotid plaque. These results suggest that enhanced monitoring of blood pressure components, among low-income residents, is crucial for decreasing the risk of stroke and other cardiovascular disease in China.


Subject(s)
Blood Pressure , Carotid Arteries/physiopathology , Carotid Artery Diseases/epidemiology , Plaque, Atherosclerotic/epidemiology , Adult , Aged , Blood Pressure Determination , China/epidemiology , Cross-Sectional Studies , Female , Humans , Life Style , Male , Middle Aged , Odds Ratio , Risk Factors , Rural Population
3.
Clin Chim Acta ; 471: 314-320, 2017 Aug.
Article in English | MEDLINE | ID: mdl-28684218

ABSTRACT

The role of homocysteine (Hcy) in the pathogenesis of coronary artery disease (CAD) is controversial, as decreased Hcy levels have not demonstrated consistent clinical benefits. Recent studies propose that S-adenosylhomocysteine (SAH), and not Hcy, plays a role in cardiovascular disease (CVD). We aimed to assess the relationship between plasma SAH and coronary artery lesions. Participants (n=160; aged 40-80years) with chest pain and suspected CAD underwent coronary angiography (CAG) for assessment of coronary artery stenosis, and were assigned to either the atherosclerosis (AS) or CAD group. Plasma SAH and S-adenosylmethionine (SAM) concentrations were measured and the association between coronary artery lesions and SAH was assessed. SAH levels were significantly higher in the CAD group (23.09±2.4nmol/L) than in the AS group (19.2±1.5nmol/L). While the AS group had higher values for SAM/SAH (5.1±0.7 vs. 4.1±1.1), levels of SAM, Hcy, folate, and vitamin B12 were similar in the two groups. Coronary artery lesions were associated with SAH (ß=11.8 [95% CI: 5.88, 17.7, P<0.05]. Plasma SAH concentrations are independently associated with coronary artery lesions among patients undergoing coronary angiography. Plasma SAH might be a novel biomarker for the early clinical identification of CVD.


Subject(s)
Coronary Artery Disease/blood , S-Adenosylhomocysteine/blood , S-Adenosylmethionine/blood , Adult , Aged , Aged, 80 and over , Case-Control Studies , Chromatography, High Pressure Liquid , Female , Humans , Male , Middle Aged
4.
Mol Cell Biochem ; 358(1-2): 281-5, 2011 Dec.
Article in English | MEDLINE | ID: mdl-21748336

ABSTRACT

Curcumin affects the functions of adipocytes. But it is not known whether curcumin has some effect on the cholesterol efflux process of adipocytes. Rabbit subcutaneous adipocytes were incubated with 5, 10 and 20 µg/ml curcumin for 24 h. The cholesterol efflux onto apoAI was assessed, and the peroxisome proliferators-activated receptor (PPAR) γ, liver X receptor (LXR) α and ATP-binding cassette transporter A1 (ABCA1) mRNA expression in adipocytes were quantified by reverse-transcription polymerase chain reaction (RT-PCR). Curcumin increased the cholesterol efflux from adipocytes in dose-dependent manner. The increased expression of PPARγ, LXRα and ABCA1 caused by curcumin were parallel. When the adipocytes were pre-treated by GW9662, the increased expression of PPARγ induced by curcumin was partially prevented, subsequent to the down-regulation of LXRα and ABCA1. Curcumin can affect the cholesterol efflux from adipocytes by regulating the PPARγ-LXR-ABCA1 passway.


Subject(s)
ATP-Binding Cassette Transporters/metabolism , Adipocytes/drug effects , Cholesterol/metabolism , Curcumin/pharmacology , Orphan Nuclear Receptors/metabolism , PPAR gamma/metabolism , Signal Transduction/drug effects , ATP Binding Cassette Transporter 1 , ATP-Binding Cassette Transporters/genetics , Adipocytes/metabolism , Animals , Gene Expression Regulation/drug effects , Liver X Receptors , Orphan Nuclear Receptors/genetics , PPAR gamma/genetics , Rabbits , Reverse Transcriptase Polymerase Chain Reaction , Subcutaneous Tissue/metabolism
5.
Cardiovasc Pathol ; 17(4): 219-25, 2008.
Article in English | MEDLINE | ID: mdl-18402819

ABSTRACT

BACKGROUND: Leptin may play an important role in the development of atherosclerosis. Several transcription genes [including peroxisome proliferator-activated receptor gamma (PPARgamma) and CD36] involved in lipid and glucose metabolism and inflammatory processes may correlate to leptin expression. The aim of this study was to investigate the effect of niacin on serum leptin levels in hypercholesterolemic rabbits and the expression of leptin, PPARgamma, and CD36 in adipocytes from hypercholesterolemic rabbits. METHODS: Eighteen rabbits fed with high-cholesterol diet for 8 weeks were randomly divided into two groups: (a) high-cholesterol group (n=6), which is maintained on high-cholesterol diet for 6 weeks, and (b) niacin group (n=6), which receives the same cholesterol diet plus niacin (200 mg/kg/day) for 6 weeks. The control group (n=6) was fed with normal diet for 14 weeks. Subcutaneous adipose was collected for RNA analysis. The direct effect of niacin on leptin release was assayed in hypercholesterolemic rabbit adipocytes. Leptin levels in serum and adipocyte culture supernatant were measured via enzyme-linked immunosorbent assay. RT-PCR was used to evaluate leptin, PPARgamma, and CD36 mRNA expression in adipose and adipocytes. RESULTS: Compared with the control group, rabbits fed with high-cholesterol diets showed higher levels of serum total cholesterol, low-density lipoprotein cholesterol, and leptin, all of which were significantly reduced by niacin treatment. After 6 weeks of treatment with niacin, the leptin level was significantly decreased by 21.8% (6.87+/-1.58 vs. 8.79+/-1.45, P<.05) and leptin mRNA expression of adipose was significantly lower in rabbits treated with niacin than in those fed with high-cholesterol diet continuously (0.58+/-0.11 vs. 0.73+/-0.15, P<.05). Niacin dose-dependently inhibited leptin secretion and increased CD36 and PPARgamma expression in cultured adipocytes. The reduction of leptin mRNA expression of hypercholesterolemic rabbits by niacin was negatively correlated with the up-regulation of PPARgamma and CD36 mRNA expression by niacin (r=-.69 and r=-.63, respectively, P<.01). CONCLUSION: Niacin can reduce serum level and adipose mRNA expression of leptin and up-regulate PPARgamma and CD36 mRNA expression in hypercholesterolemic rabbits.


Subject(s)
Adipocytes/metabolism , Cholesterol, Dietary/administration & dosage , Hyperlipidemias/drug therapy , Hypolipidemic Agents/pharmacology , Leptin/metabolism , Niacin/pharmacology , Adipose Tissue/metabolism , Animals , CD36 Antigens/genetics , CD36 Antigens/metabolism , Cell Culture Techniques , Cholesterol, LDL/blood , Disease Models, Animal , Gene Expression/drug effects , Hyperlipidemias/blood , Hyperlipidemias/etiology , Leptin/genetics , Male , PPAR gamma/genetics , PPAR gamma/metabolism , RNA, Messenger/metabolism , Rabbits
6.
Clin Chim Acta ; 389(1-2): 67-71, 2008 Mar.
Article in English | MEDLINE | ID: mdl-18155667

ABSTRACT

BACKGROUND: The pro-inflammatory cytokine tumor necrosis factor-alpha (TNF-alpha) has multiple effects on adipocyte, including cell differentiation, lipolysis and the production of adipokines. It is not known whether TNF-alpha has effect on cholesterol efflux in adipocyte. METHODS: Rabbit subcutaneous adipocytes were incubated with 5, 10, 20 ng/ml TNF-alpha for 24 h. The cholesterol efflux onto apoAI was assessed, and the related peroxisome proliferators-activated receptor (PPAR) gamma, liver X receptor (LXR) alpha and ATP binding cassette transporter A1 (ABCA1) mRNA expression in adipocytes were quantified by reverse transcription polymerase chain reaction. RESULTS: Treatment of adipocytes with 5 or 10 ng/ml TNF-alpha for 24 h increased cholesterol efflux, and the effect of 10 ng/ml TNF-alpha was significant higher than the control group. In contrast, 20 ng/ml TNF-alpha decreased cholesterol efflux compared with 10 ng/ml TNF-alpha. The expression of ABCA1 was increased by 5 ng/ml or 10 ng/ml TNF-alpha compared with control group, and was inhibited by 20 ng/ml TNF-alpha. The PPARgamma and LXRalpha mRNA were also significantly induced by 10 ng/ml TNF-alpha and down regulated by higher TNF-alpha concentration. After pre-treated by GW9662, the expression of PPARgamma induced by TNF-alpha was partially prevented, subsequent to the down-regulation of LXRalpha and ABCA1. CONCLUSIONS: TNF-alpha affects cholesterol efflux and ABCA1 expression of adipocytes, and the pathway of PPARgamma-LXRalpha-ABCA1 is probably involved.


Subject(s)
Adipocytes/metabolism , Cholesterol/metabolism , Tumor Necrosis Factor-alpha/physiology , ATP Binding Cassette Transporter 1 , ATP-Binding Cassette Transporters/metabolism , Animals , Base Sequence , Biological Transport , Cells, Cultured , DNA Primers , DNA-Binding Proteins/metabolism , Liver X Receptors , Orphan Nuclear Receptors , PPAR gamma/metabolism , Rabbits , Receptors, Cytoplasmic and Nuclear/metabolism , Reverse Transcriptase Polymerase Chain Reaction
7.
Int J Cardiol ; 128(1): 42-7, 2008 Aug 01.
Article in English | MEDLINE | ID: mdl-17643522

ABSTRACT

BACKGROUND: The adipocyte has been proven to recognize and degrade oxidized low-density lipoprotein (oxLDL), while cholesterol efflux from adipocytes to clear excess cholesterol loaded by oxLDL is essential to maintain its normal function. Thus, it is intriguing to explore the effects of oxLDL on cholesterol efflux in adipocytes. METHODS: Fully differentiated 3T3-L1 cells were incubated in the medium containing various concentrations of oxLDL (0 to 50 microg/mL) for 8 or 24 h. 10 micromol/L 22(R)-hydroxycholesterol was exposed to preconditioned adipocytes with 25 microg/mL oxLDL for 24 h. Reverse transcription polymerase chain reaction (RT-PCR) was used to evaluate adipocytes mRNA expression. Cholesterol efflux rate was determined through measuring release of radioactivity from (3)H-cholesterol prelabeled cells into medium containing apolipoprotein A-I (apoA-I). RESULTS: Low concentrations of oxLDL caused a significant increase in apoA-I-mediated cholesterol efflux via enhancement of ATP binding cassette transporter A1 (ABCA1) pathway, whereas higher concentrations were incapable. In adipocytes preincubated with 25 microg/mL oxLDL for 24 h, 22(R)-hydroxycholesterol could increase ABCA1 and LXR* mRNA levels and apoA-I-mediated cholesterol efflux. CONCLUSION: OxLDL has dual effects on ABCA1 pathway in adipocytes. It depends on the concentration and exposure time. The new action of low levels of oxLDL may provide further understanding to its atheroprotective effects.


Subject(s)
Adipocytes/metabolism , Cholesterol/metabolism , Lipoproteins, LDL/pharmacology , 3T3-L1 Cells , Adipocytes/drug effects , Animals , Apolipoprotein A-I/metabolism , Hydroxycholesterols/pharmacology , Lipid Metabolism , Mice , Oxidation-Reduction , Reverse Transcriptase Polymerase Chain Reaction , Up-Regulation
8.
Int J Cardiol ; 124(2): 172-8, 2008 Feb 29.
Article in English | MEDLINE | ID: mdl-17395297

ABSTRACT

BACKGROUND: Adipose tissue contains a large amount of cholesterol and performs a buffer function for circulating cholesterol. Liver X receptors (LXR) alpha and peroxisome proliferator-activated receptor gamma (PPARgamma) might play a significant role in adipocyte cholesterol metabolism through mediation of cholesterol efflux. The aim of this study was to evaluate the effect of niacin on LXRalpha and PPARgamma expression and HDL-induced cholesterol efflux in adipocytes from hypercholesterolemic rabbits. METHODS: Twelve rabbits fed with high-cholesterol diet for 8 weeks were randomly divided into two groups: (1) high cholesterol group (n=6): maintained high cholesterol diet for 6 weeks; (2) niacin group (n=6): the same cholesterol diet plus niacin (200 mg/kg/d) for 6 weeks. Control group (n=6) was fed with normal diet for 14 weeks. Subcutaneous adipose was collected for adipocyte culture. Reverse transcription polymerase chain reaction (RT-PCR) was used to evaluate adipocytes LXRalpha mRNA expressions. Cholesterol efflux rate was determined through measuring release of radioactivity from (3)H-cholesterol prelabeled cells into medium containing high-density lipoprotein (HDL). The direct effect of niacin on LXRalpha and PPARgamma mRNA expression in primary rabbit adipocytes was assayed. RESULTS: High cholesterol diet resulted in decreased LXRalpha mRNA expressions and reduced HDL-induced cholesterol efflux rate in adipocytes. Six weeks of niacin treatment significantly enhanced the cholesterol efflux from adipocytes, which was related to the increased mRNA expressions of LXRalpha (r=0.71, P<0.05). In in vitro study, niacin dose-dependently stimulated LXRalpha and PPARgamma mRNA expression in cultured adipocytes. And various doses of niacin-induced cholesterol efflux was positive correlation with LXRalpha and PPARgamma mRNA expression (r=0.83 P<0.01; r=0.76 P<0.05; respectively). CONCLUSION: Niacin can up-regulate LXRalpha and PPARgamma mRNA expression and promote the HDL-induced cholesterol efflux in adipocytes from hypercholesterolemic rabbits.


Subject(s)
Anticholesteremic Agents/pharmacology , DNA-Binding Proteins/metabolism , Niacin/pharmacology , Peroxisome Proliferator-Activated Receptors/metabolism , Receptors, Cytoplasmic and Nuclear/metabolism , Adipocytes/drug effects , Analysis of Variance , Animals , Biological Transport , Cholesterol/metabolism , Cholesterol, HDL/administration & dosage , DNA-Binding Proteins/genetics , Disease Models, Animal , Gene Expression Regulation , Hypercholesterolemia/drug therapy , Liver X Receptors , Male , Orphan Nuclear Receptors , Peroxisome Proliferator-Activated Receptors/genetics , Probability , RNA, Messenger/drug effects , Rabbits , Random Allocation , Receptors, Cytoplasmic and Nuclear/genetics , Reference Values , Reverse Transcriptase Polymerase Chain Reaction , Sensitivity and Specificity
9.
Zhonghua Xin Xue Guan Bing Za Zhi ; 35(8): 745-9, 2007 Aug.
Article in Chinese | MEDLINE | ID: mdl-17963637

ABSTRACT

OBJECTIVE: To investigate the effect of niacin on HDL-induced cholesterol efflux and LXRalpha expression in adipocytes from hypercholesterolemic rabbits. METHODS: Twelve rabbits fed with high-cholesterol diet for 8 weeks were randomly divided into two groups: (1) high cholesterol group (n = 6): maintained high cholesterol diet for 6 weeks; (2) niacin group (n = 6): the same cholesterol diet plus niacin (0.2 g . kg(-1). d(-1)) for 6 weeks. Control group (n = 6) was fed with normal diet for 14 weeks. Subcutaneous adipose was collected for adipocyte culture. RT-PCR was used to evaluate adipocytes LXRalpha mRNA expressions. Cholesterol efflux rate was determined through measuring release of radioactivity from 3H-cholesterol prelabeled cells into medium containing HDL. The direct effect of niacin on LXRalpha and PPARgamma mRNA expression in primary rabbit adipocytes was assayed. RESULTS: High cholesterol diet resulted in decreased LXRalpha mRNA expressions and reduced cholesterol efflux rate in adipocytes. Six weeks of niacin treatment significantly enhanced the cholesterol efflux from adipocytes, which was related to the increased mRNA expressions of LXRalpha (r = 0.71, P < 0.05). In vitro study, niacin dose-dependently stimulated LXRalpha and PPARgamma mRNA expression in cultured adipocytes and there were positive correlations between various doses of niacin-induced cholesterol efflux and LXRalpha and PPARgamma mRNA expression (r = 0.83 P < 0.01, r = 0.76 P < 0.05, respectively). CONCLUSION: LXRalpha and PPARgamma might play an important role in cholesterol efflux from adipocytes. Niacin can up-regulate LXRalpha and PPARgamma mRNA expressions and promote the cholesterol efflux in adipocytes from hypercholesterolemic rabbits.


Subject(s)
Adipocytes/drug effects , Adipocytes/metabolism , DNA-Binding Proteins/metabolism , Hyperlipidemias/metabolism , Niacin/pharmacology , Receptors, Cytoplasmic and Nuclear/metabolism , Animals , Cholesterol/metabolism , Disease Models, Animal , Hypercholesterolemia/drug therapy , Hypercholesterolemia/metabolism , Hyperlipidemias/drug therapy , Liver X Receptors , Male , Niacin/therapeutic use , Orphan Nuclear Receptors , PPAR gamma/metabolism , Rabbits
10.
Zhong Nan Da Xue Xue Bao Yi Xue Ban ; 32(4): 631-6, 2007 Aug.
Article in Chinese | MEDLINE | ID: mdl-17767055

ABSTRACT

OBJECTIVE: To explore whether oxidized low-density lipoprotein (ox-LDL) can stimulate the cholesterol efflux in fully differentiated 3T3-L1 cells and the possible mechanism. METHODS: Fully differentiated 3T3-L1 cells were incubated in the medium containing various concentrations of ox-LDL ( 0 to 50 microg/mL) for 8 or 24 hours. 22(R)-Hydroxycholesterol (10 micromol/L) was exposed to preconditioned adipocytes with 25 microg/mL ox-LDL for 24 hours. Reverse transcription polymerase chain reaction (RT-PCR) was used to evaluate ATP binding cassette transporter A1 (ABCA1), scavenger receptor class B type I (SR-BI), and liver X receptor alpha (LXRalpha) mRNA expression. Cholesterol efflux mediated by apolipoprotein A-I (apoA-I) was determined using liquid scintillator. RESULTS: Low levels (12.5-25 microg/mL) of ox-LDL could increase cholesterol efflux via the enhancement of ABCA1 pathway and SR-BI expression, whereas the higher concentration (50 microg/mL) could not. In adipocytes preincubated with 25 microg/mL ox-LDL for 24 hours, 22(R)-hydroxycholesterol could increase ABCA1 and LXRalpha mRNA and apoA-I-mediated cholesterol efflux, but had no effect on the SR-BI mRNA expression. CONCLUSION: Low levels of ox-LDL may enhance the LXRalpha-ABCA1-apoA-I pathway in adipocytes, up-regulate SR-BI mRNA expression, and then increase the cholesterol efflux. This new effect of ox-LDL will not only make contribution to cholesterol homeostasis in adipocytes, but also be potentially atheroprotective.


Subject(s)
Adipocytes/metabolism , Cholesterol/metabolism , Lipoproteins, LDL/pharmacology , 3T3-L1 Cells , ATP Binding Cassette Transporter 1/metabolism , Adipocytes/drug effects , Animals , Lipid Metabolism , Liver X Receptors , Mice , Orphan Nuclear Receptors/metabolism , Scavenger Receptors, Class B/metabolism
11.
Zhong Nan Da Xue Xue Bao Yi Xue Ban ; 32(3): 480-4, 2007 Jun.
Article in Chinese | MEDLINE | ID: mdl-17611329

ABSTRACT

OBJECTIVE: To explore the effect of niacin on the serum adiponectin concentration in hypercholesterolemia rabbit and the adiponectin concentration secreted by adipocytes in normal rabbits. METHODS: Ten male New Zealand white rabbits fed with high cholesterol diet for 8 weeks were randomly divided into 2 groups: (1) The high cholesterol group maintained a high cholesterol diet for 8 weeks. (2) The same cholesterol diet plus niacin (0.4g/kg*d ) were administrated for 6 weeks in the niacin group. A control group was fed with normal diet for 14 weeks. Subcutaneous adipose from the control group was collected for adipocyte culture. Matured adipocytes were incubated with various concentrations of niacin (0, 0.25, 0.5, 1.0, and 2.0micromol/L). Adiponectin concentrations in the serum and adipocyte culture supernatant were measured by enzyme-linked-immunosorbent assay. RESULTS: Compared with the control group, rabbits in the high cholesterol group showed higher serum levels of total cholesterol, and low density lipoprotein cholesterol (LDL-C), all of which were significantly reduced by niacin treatment (P<0.01),and serum high density lipoprotein-cholesterol (HDL-C) significantly increased (P<0.01). At 8th week, the mean adiponectin concentration of rabbits fed with high cholesterol diet was significantly lower than that of the control group[(1.268+/-0.039)mg/L vs.(1.449+/-0.107)mg/L,P<0.01]. Niacin treatment significantly elevated the serum adiponectin level which was positively related to HDL-C,and negatively related to TC and LDL-C. Cell experiment in vitro indicated that niacin could significantly induce the adiponectin secretion of adipocytes in a dose-dependent manner. CONCLUSION: Niacin can significantly promote the adiponectin secretion of adipocytes, suggesting that niacin probably has an ability of elevating the serum adiponectin level in addition to lipid-lowering effect.


Subject(s)
Adipocytes/drug effects , Adiponectin/metabolism , Niacin/pharmacology , Adipocytes/cytology , Adipocytes/metabolism , Adiponectin/blood , Animals , Cholesterol/blood , Cholesterol, Dietary/administration & dosage , Cholesterol, Dietary/toxicity , Cholesterol, HDL/blood , Cholesterol, LDL/blood , Dose-Response Relationship, Drug , Hypercholesterolemia/blood , Hypercholesterolemia/etiology , Hypercholesterolemia/prevention & control , Hypolipidemic Agents/pharmacology , Male , Rabbits , Random Allocation
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