251
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Huang KC, Lin RCY, Kormas N, Lee LT, Chen CY, Gill TP, Caterson ID. Plasma leptin is associated with insulin resistance independent of age, body mass index, fat mass, lipids, and pubertal development in nondiabetic adolescents. Int J Obes (Lond) 2004; 28:470-5. [PMID: 14993909 DOI: 10.1038/sj.ijo.0802531] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
OBJECTIVE The rising epidemic worldwide in overweight and obese children requires urgent attention. Leptin has been found to be associated with body weight control and possibly affects insulin sensitivity. Since insulin resistance is associated with obesity in adults and possibly in adolescents, we set out to investigate the association of plasma leptin level with various anthropometric indices, body fat mass (FM), lipids, and insulin resistance (IR) index in nondiabetic adolescents. DESIGN A cross-sectional study from three high schools in Taipei City in Taiwan. SUBJECTS A total of 402 nondiabetic subjects (162 boys and 240 girls; age range, 10-19 y; mean age, 15.8+/-1.9 y, and mean body mass index (BMI), 24.8+/-4.6 kg/m(2)) were recruited. MEASUREMENTS The fasting plasma leptin, plasma glucose, insulin, lipids, and anthropometric indices including height, weight, waist (WC) and hip circumferences, and waist-to-hip ratio (WHR) were examined. Total body FM and percentage body fat (FM%) were obtained from dual-energy X-ray absorptiometry. The homeostasis model was applied to estimate the degree of IR. RESULTS The plasma leptin levels were significantly higher in girls (17.45+/-10.13 ng/ml) than boys (8.81+/-6.71 ng/ml, P<0.001). The plasma leptin levels were positively correlated to BMI, WC, WHR, FM, FM%, and triglycerides (TG). The IR index was positively correlated to BMI, WC, WHR, FM, FM%, TG, and leptin. Using the multivariate linear regression models, we found that plasma leptin remains significantly associated with IR index even after adjusting for age, gender, BMI, FM, WC, Tanner stage, and TG. CONCLUSION Plasma leptin was associated with IR index independent of age, gender, BMI, FM, WC, Tanner stage, and TG. Plasma leptin levels in adolescents could be a predictor for the development of the metabolic syndrome disorders and cardiovascular diseases.
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Affiliation(s)
- K-C Huang
- Department of Family Medicine, National Taiwan University Hospital, Taiwan.
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252
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Peelman F, Waelput W, Iserentant H, Lavens D, Eyckerman S, Zabeau L, Tavernier J. Leptin: linking adipocyte metabolism with cardiovascular and autoimmune diseases. Prog Lipid Res 2004; 43:283-301. [PMID: 15234549 DOI: 10.1016/j.plipres.2004.03.001] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Leptin was originally discovered as an adipocyte-derived hormone involved in the central control of body weight and energy homeostasis. It is now clear that leptin is a pleiotropic cytokine, with activities on many peripheral cell types. These findings may help explain the surprising role of leptin in pathophysiological processes. Recent evidence suggests that leptin contributes to atherosclerosis and to the increased risk of cardiovascular disease in obese people. Leptin also appears to be involved in T-cell-dependent immunity and possibly in the development and maintenance of certain autoimmune diseases. Here, we review the role of leptin in cardiovascular and autoimmune diseases, and also briefly address the potential therapeutic use of leptin antagonists.
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Affiliation(s)
- F Peelman
- Flanders Interuniversity Institute for Biotechnology, VIB09, Department of Medical Protein Research, Faculty of Medicine and Health Sciences, Ghent University, A. Baertsoenkaai 3, B-9000 Ghent, Belgium
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253
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Porreca E, Di Febbo C, Moretta V, Angelini A, Guglielmi MD, Di Nisio M, Cuccurullo F. Circulating leptin is associated with oxidized LDL in postmenopausal women. Atherosclerosis 2004; 175:139-43. [PMID: 15186958 DOI: 10.1016/j.atherosclerosis.2004.03.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2003] [Revised: 02/23/2004] [Accepted: 03/17/2004] [Indexed: 10/26/2022]
Abstract
Recently, leptin has been suggested as a possible cause of atherosclerotic disease. In the present study, we have investigated in postmenopausal women (n = 60; age: 52 +/- 13) the relationship between circulating levels of leptin, oxidized LDL (Ox-LDL) and other biochemical and anthropometric variables of atherosclerotic risk. In addition, we have evaluated soluble thrombomodulin (sTM) as a marker of endothelial damage. An additional study was conducted in a subgroup of obese subjects to determine the short-term effects of weight loss on selected variables. Ox-LDL showed a positive correlation with leptin circulating levels (r = 0.65, P < 0.0001). A significant association was also found between Ox-LDL and body mass index (r = 0.69, P < 0.0001), waist-to-hip ratio (r = 0.50, P < 0.0001), insulin levels (r = 0.65, P < 0.0001), HOMA index (r = 0.55, p < 0.0001) and sTM (r = 0.74, P < 0.0001) levels. After multivariate regression analysis leptin was still related to Ox-LDL levels (P = 0.007). In obese women who completed the program of weight reduction, leptin changes persisted as a significant predictor of plasma changes in Ox-LDL levels. These findings suggested a novel link between leptin and Ox-LDL, possibly involved in atherosclerotic disease.
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Affiliation(s)
- Ettore Porreca
- Department of Medicine and Aging, G. D'Annunzio Foundation, Medical School, University of Chieti, Via dei Vestini, 66013 Chieti, Italy.
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254
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Ferreira I, Snijder MB, Twisk JWR, van Mechelen W, Kemper HCG, Seidell JC, Stehouwer CDA. Central fat mass versus peripheral fat and lean mass: opposite (adverse versus favorable) associations with arterial stiffness? The Amsterdam Growth and Health Longitudinal Study. J Clin Endocrinol Metab 2004; 89:2632-9. [PMID: 15181034 DOI: 10.1210/jc.2003-031619] [Citation(s) in RCA: 144] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Central and peripheral fatness seem to confer opposite (i.e. adverse vs. protective) effects on cardiovascular risk, but how this occurs is not clear. In addition, the role of peripheral lean mass needs to be elucidated. We therefore investigated, in 336 (175 women) 36-yr-old and apparently healthy adults, the relationship between trunk fat, peripheral fat, and peripheral lean mass on the one hand, and estimates of stiffness of three large arteries on the other. Body composition was assessed by dual-energy x-ray absorptiometry. Arterial properties were assessed by ultrasound imaging. We found that 1) trunk fat was positively (i.e. adversely) associated with stiffness of the carotid and femoral arteries, whereas peripheral fat was inversely (i.e. favorably) associated with stiffness of the brachial and the carotido-femoral segment; 2) peripheral lean mass was positively associated with arterial diameter and carotid compliance and inversely associated with stiffness of the carotido-femoral segment; and 3) after adjustment for the other body composition variables, the above-mentioned associations remained, but peripheral fat in addition became, if anything, favorably associated with stiffness of the femoral artery. We conclude that trunk fat is adversely associated with large artery stiffness, whereas some degree of protection is conferred by peripheral fat and lean mass.
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Affiliation(s)
- Isabel Ferreira
- Institute for Research in Extramural Medicine, VU University Medical Center, 1081 HV Amsterdam, The Netherlands
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255
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Lakkis J, Weir MR. Pharmacological strategies for kidney function preservation: are there differences by ethnicity? ACTA ACUST UNITED AC 2004; 11:24-40. [PMID: 14730536 DOI: 10.1053/j.arrt.2003.11.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The prevalence of chronic kidney disease (CKD) is on the rise in all ethnic groups. This is because of the increased prevalence of obesity, diabetes mellitus, the metabolic syndrome, and the inadequate control of elevated blood pressure and other cardiovascular-renal risk factors, especially in ethnic minority populations. The implications of the aforementioned trends in risk factor prevalence and control are profound. Moreover, these trends negatively impact patient quality of life and place an enormous financial burden on the health care system for the provision of care to patients with CKD, end-stage renal disease (ESRD), and/or cardiovascular disease (CVD). Thus, it is of utmost importance to devise strategies that prevent kidney disease and delay progressive loss of kidney function in persons with CKD. Proven strategies include pharmacological interventions that lower blood pressure to less than target levels (<130/80 mm Hg), attainment of optimal glycemic control (Hb A1c <7%), and reducing urinary protein excretion. It is also possible, although yet unproven, that correction of anemia and aggressive treatment of dyslipidemia may forestall the loss of kidney function. In general, ethnic minorities are underrepresented in most large trials. Recently, a few outcome clinical trials in blacks have reinforced the lessons of kidney function preservation already learned in nonblack populations. That is, the reversible risk factors for CKD appear to be virtually identical and, at least in nondiabetic CKD, pharmacological targeting of the renin-angiotensin-aldosterone system (RAAS) with angiotensin-converting enzyme inhibitors and angiotensin II receptor blockers preserves kidney function better than non-RAAS blood pressure-lowering regimens, especially when significant proteinuria exists. Although more CKD studies in ethnic minorities are needed, until they become available, the best available evidence from the existing clinical trial database should be applied to minorities with CKD-even when specific data are not available for a specific racial or ethnic group. Why this approach? First, there are no known unique risk factors for kidney disease in any ethnic group. Second, poor control of reversible risk factors for CKD is universal, particularly in blacks and other ethnic minorities. Thus, it is logical to predict that more efficient use of strategies proven to forestall loss of kidney function will reduce the excess of CKD and ESRD in ethnic minorities relative to non-minority populations. However, medical-based strategies alone are probably not enough. The global epidemic of obesity will fuel the growing population of persons, especially among ethnic minorities, with diabetes, the main cause of CKD, ESRD, and CVD. The obesity and diabetes epidemics are unlikely to abate without innovative and ultimately effective public health approaches.
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Affiliation(s)
- Jay Lakkis
- Department of Medicine, Division of Nephrology, University of Maryland, School of Medicine, Baltimore, MD, USA
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256
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Savoia C, Schiffrin EL. Significance of recently identified peptides in hypertension: endothelin, natriuretic peptides, adrenomedullin, leptin. Med Clin North Am 2004; 88:39-62. [PMID: 14871050 DOI: 10.1016/s0025-7125(03)00122-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Arterial hypertension is one of the major risk factors in cardiovascular and renal disease. Advances in the study of pathophysiologic mechanisms and the relationship between several regulatory systems provide the basis for development of more selective therapeutic strategies. The increasing understanding of the role played by ETs, natriuretic peptides, AM, and leptin opens new frontiers in the care of hypertension and its complications, coronary artery disease and heart failure and other forms of cardiovascular disease.
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Affiliation(s)
- Carmine Savoia
- Experimental Hypertension Laboratory of the CIHR Multidisciplinary Research Group on Hypertension, Clinical Research Institute of Montreal, West Montreal, QC, Canada
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257
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Ferreira I, Twisk JWR, van Mechelen W, Kemper HCG, Seidell JC, Stehouwer CDA. Current and adolescent body fatness and fat distribution. J Hypertens 2004; 22:145-55. [PMID: 15106806 DOI: 10.1097/00004872-200401000-00024] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE Body fat and its distribution are determinants of cardiovascular disease but the underlying mechanisms of these adverse effects are poorly understood. We therefore investigated (1) the cross-sectional relationship between estimates of body fatness and its distribution on the one hand and carotid atherosclerosis and stiffness of the carotid, femoral and brachial arteries and the carotido-femoral segment on the other (336 subjects, 175 women); (2) the relationship between estimates of body fatness and its distribution during adolescence (13-16 years) and the same arterial properties at age 36- prospective analyses (subpopulation of 159 subjects, 84 girls). DESIGN Cross-sectional and prospective analyses within an ongoing observational longitudinal study: The Amsterdam Growth and Health Longitudinal Study. METHODS Body fatness and its distribution were assessed by anthropometry and dual-energy X-ray absorptiometry (DXA); arterial properties were assessed non-invasively by ultrasound imaging. RESULTS Total adiposity and, in men, truncal subcutaneous fat accumulation during adolescence, were positively and independently associated with carotid intima-media thickness at age 36, a pre-clinical indicator of atherosclerosis. Adolescent truncal subcutaneous fat accumulation but not total adiposity was associated with increased arterial stiffness at age 36. At age 36, both abdominal and truncal subcutaneous fat were independently associated with arterial stiffness, while the associations between total adiposity and arterial stiffness appeared to be mediated by other cardiovascular risk factors. CONCLUSIONS Body fatness and body fat distribution are associated with large artery structural and functional properties at age 36 and the roots of these associations may already be present in adolescence.
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Affiliation(s)
- Isabel Ferreira
- Institute for Research in Extramural Medicine, Vrije Universiteit University Medical Center, Amsterdam, The Netherlands
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258
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Schäfer K, Halle M, Goeschen C, Dellas C, Pynn M, Loskutoff DJ, Konstantinides S. Leptin promotes vascular remodeling and neointimal growth in mice. Arterioscler Thromb Vasc Biol 2003; 24:112-7. [PMID: 14615386 DOI: 10.1161/01.atv.0000105904.02142.e7] [Citation(s) in RCA: 177] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
OBJECTIVE Human obesity is associated with elevated leptin levels and a high risk of death from cardiovascular disease. In the present study, we investigated the effects of leptin on vascular wound healing and arterial lesion growth in mice. METHODS AND RESULTS Wild-type mice placed on an atherogenic, high-fat diet had elevated (9-fold) leptin levels compared with their counterparts maintained on normal chow, and the former demonstrated significantly enhanced neointimal thickening after carotid artery injury with ferric chloride. The lesions forming in response to injury strongly expressed leptin receptor mRNA and protein. Unexpectedly, the atherogenic diet had no effect on injured vessels from leptin-deficient ob/ob mice despite aggravating obesity, diabetes, and hyperlipidemia in these animals. Daily administration of leptin to ob/ob mice during the 3-week period after injury reversed this phenotype, dramatically increasing neointimal thickness and the severity of luminal stenosis. Exogenous leptin also enhanced lesion growth and increased cellular proliferation in injured arteries from wild-type mice but had no effect on vessels from leptin receptor-deficient db/db mice. CONCLUSIONS Our results raise the possibility that there might be a direct, leptin receptor-mediated link between the hyperleptinemia in human obesity and the increased risk for cardiovascular complications associated with this condition.
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MESH Headings
- Animals
- Aorta/cytology
- Arteriosclerosis/metabolism
- Carotid Arteries/drug effects
- Carotid Arteries/metabolism
- Carotid Arteries/pathology
- Chlorides
- Diet, Atherogenic
- Dietary Fats/adverse effects
- Disease Models, Animal
- Ferric Compounds/toxicity
- Gene Expression Regulation
- Hyperplasia
- Leptin/deficiency
- Leptin/genetics
- Leptin/pharmacology
- Leptin/physiology
- Mice
- Mice, Inbred C57BL
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/pathology
- Obesity/genetics
- Obesity/metabolism
- RNA, Messenger/biosynthesis
- Receptors, Cell Surface/biosynthesis
- Receptors, Cell Surface/deficiency
- Receptors, Cell Surface/genetics
- Receptors, Cell Surface/physiology
- Receptors, Leptin
- Recombinant Proteins/pharmacology
- Tunica Intima/pathology
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Affiliation(s)
- Katrin Schäfer
- Department of Cardiology and Pulmonary Medicine, University of Goettingen, Goettingen, Germany
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259
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Wildman RP, Mackey RH, Bostom A, Thompson T, Sutton-Tyrrell K. Measures of obesity are associated with vascular stiffness in young and older adults. Hypertension 2003; 42:468-73. [PMID: 12953016 DOI: 10.1161/01.hyp.0000090360.78539.cd] [Citation(s) in RCA: 294] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Obesity has reached epidemic levels and carries a risk for cardiovascular disease. Obesity's effects on the vascular systems of young adults and African Americans have not been well characterized. The aim of this study was to assess the association between measures of obesity and aortic stiffness in 186 young adults (20 to 40 years, 50% African American) and 177 older adults (41 to 70 years, 33% African American). Aortic stiffness was measured by aortic pulse-wave velocity. The median pulse-wave velocity value was 468 cm/s for young adults and 627 cm/s for older adults (P<0.001). Higher body weight, body mass index, waist and hip circumferences, and waist-hip ratio were strongly correlated with higher pulse-wave velocity, independent of age, systolic blood pressure, race, and sex overall and among both age groups (P<0.01 for all). Even among the 20- to 30-year-olds, obese individuals (body mass index>30) had a mean pulse-wave velocity value 47 cm/s higher than did nonobese individuals (P<0.001). Obesity measures were among the strongest independent predictors of pulse-wave velocity overall and for both age groups. Results were consistent by race. In conclusion, excess body weight is associated with higher aortic stiffness in whites and African Americans as young as 20 to 30 years. The strength of the association, the early age at which it appears, and the prevalence of obesity among the young warn of substantially increased cardiovascular disease incidence as this cohort ages.
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Affiliation(s)
- Rachel P Wildman
- Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA 15261, USA
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260
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Werneke U, Taylor D, Sanders TAB, Wessely S. Behavioural management of antipsychotic-induced weight gain: a review. Acta Psychiatr Scand 2003; 108:252-9. [PMID: 12956825 DOI: 10.1034/j.1600-0447.2003.00190.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
OBJECTIVE Although psychiatrists are aware of weight gain induced by atypical antipsychotics, only few studies on behavioural interventions in this patient group are published. This review aims to summarize the evidence on effectiveness of behavioural interventions for weight gain in the general population and in-patients treated with atypical antipsychotics. METHOD Medline and Cochrane databases search for evidence on effectiveness of behavioural interventions. RESULTS In general, behavioural approaches including, diet, exercise and drug treatments may be effective. There were only 13 studies of behavioural interventions for patients taking antipsychotic medication. No study met the criteria for a RCT. Calorie restriction in a controlled ward environment, structured counselling combined with cognitive behavioural therapy and counselling on life style and provision of rewards may potentially lead to weight loss. CONCLUSION Currently only limited, methodologically flawed, evidence is available that behavioural interventions in overweight patients treated with antipsychotics, although intuitively appealing, actually work.
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Affiliation(s)
- U Werneke
- Centre for the Economics in Mental Health, Institute of Psychiatry, Maudsley Hospital, London, UK.
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261
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Pladevall M, Williams K, Guyer H, Sadurní J, Falces C, Ribes A, Paré C, Brotons C, Gabriel R, Serrano-Ríos M, Haffner S. The association between leptin and left ventricular hypertrophy: a population-based cross-sectional study. J Hypertens 2003; 21:1467-73. [PMID: 12872039 DOI: 10.1097/00004872-200308000-00009] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND AND OBJECTIVES Plasma leptin levels have been shown to be an independent risk factor for cardiovascular disease. Leptin has been shown to have sympathetic and vascular effects, and may increase cardiovascular risk through increased blood pressure, left ventricular hypertrophy, or atherosclerotic mechanisms. This study examines whether leptin levels, independent of body mass and insulin resistance, are a risk factor for hypertension and left ventricular hypertrophy. METHODS AND PARTICIPANTS A population-based, cross-sectional sample of 410 adults from rural Spain was studied. The correlations between plasma leptin levels and left ventricular mass index, sum of wall thicknesses, and blood pressure were calculated. Multiple linear regression analysis was used to adjust for other cardiovascular risk factors. RESULTS After adjusting for age, body mass index, systolic blood pressure, sex, and insulin resistance, leptin was inversely associated with left ventricular mass index (beta = -0.20, P < 0.01). Leptin was also inversely related to the sum of wall thicknesses; however, this association did not reach statistical significance (beta = -0.12, P = 0.063). Leptin was not statistically associated with blood pressure after adjusting for body mass index. CONCLUSIONS The results do not support the hypothesis that leptin increases cardiovascular risk by increasing left ventricular mass index or blood pressure. Other mechanisms, related to atherosclerosis, could explain the increased risk of cardiovascular diseases observed with high leptin levels.
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Affiliation(s)
- Manel Pladevall
- Center for Health Services Research, Henry Ford Health System, Detroit, Michigan, USA [corrected]
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262
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Altman R. Risk factors in coronary atherosclerosis athero-inflammation: the meeting point. Thromb J 2003; 1:4. [PMID: 12904259 PMCID: PMC179880 DOI: 10.1186/1477-9560-1-4] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2003] [Accepted: 07/17/2003] [Indexed: 12/17/2022] Open
Affiliation(s)
- Raul Altman
- Centro de Trombosis de Buenos Aires and Catedra de Magister en Trombosis, Facultad de Medicina, Universidad Nacional de Tucuman, Argentina.
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263
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Pecoits-Filho R, Lindholm B, Stenvinkel P. End-stage renal disease: a state of chronic inflammation and hyperleptinemia. Eur J Clin Invest 2003; 33:527-8. [PMID: 12795652 DOI: 10.1046/j.1365-2362.2003.01175.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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264
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Laker MF. Nutrition and metabolism. Curr Opin Lipidol 2003; 14:321-3. [PMID: 12840661 DOI: 10.1097/00041433-200306000-00011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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265
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Affiliation(s)
- Kathryn Buchanan Keller
- Florida Atlantic University College of Nursing, Boca Raton, Fla (KBK) and the Division of Cardiology, Department of Medicine, University of Miami School of Medicine, Miami, Fla (LL)
| | - Louis Lemberg
- Florida Atlantic University College of Nursing, Boca Raton, Fla (KBK) and the Division of Cardiology, Department of Medicine, University of Miami School of Medicine, Miami, Fla (LL)
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