1
|
Karmazyn M, Gan XT. Molecular and Cellular Mechanisms Underlying the Cardiac Hypertrophic and Pro-Remodelling Effects of Leptin. Int J Mol Sci 2024; 25:1137. [PMID: 38256208 PMCID: PMC10816997 DOI: 10.3390/ijms25021137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 01/10/2024] [Accepted: 01/11/2024] [Indexed: 01/24/2024] Open
Abstract
Since its initial discovery in 1994, the adipokine leptin has received extensive interest as an important satiety factor and regulator of energy expenditure. Although produced primarily by white adipocytes, leptin can be synthesized by numerous tissues including those comprising the cardiovascular system. Cardiovascular function can thus be affected by locally produced leptin via an autocrine or paracrine manner but also by circulating leptin. Leptin exerts its effects by binding to and activating specific receptors, termed ObRs or LepRs, belonging to the Class I cytokine family of receptors of which six isoforms have been identified. Although all ObRs have identical intracellular domains, they differ substantially in length in terms of their extracellular domains, which determine their ability to activate cell signalling pathways. The most important of these receptors in terms of biological effects of leptin is the so-called long form (ObRb), which possesses the complete intracellular domain linked to full cell signalling processes. The heart has been shown to express ObRb as well as to produce leptin. Leptin exerts numerous cardiac effects including the development of hypertrophy likely through a number of cell signaling processes as well as mitochondrial dynamics, thus demonstrating substantial complex underlying mechanisms. Here, we discuss mechanisms that potentially mediate leptin-induced cardiac pathological hypertrophy, which may contribute to the development of heart failure.
Collapse
|
2
|
Coimbra S, Catarino C, Sameiro Faria M, Nunes JPL, Rocha S, Valente MJ, Rocha-Pereira P, Bronze-da-Rocha E, Bettencourt N, Beco A, Marques SHDM, Oliveira JG, Madureira J, Fernandes JC, Miranda V, Belo L, Santos-Silva A. The Association of Leptin with Left Ventricular Hypertrophy in End-Stage Kidney Disease Patients on Dialysis. Biomedicines 2023; 11:biomedicines11041026. [PMID: 37189644 DOI: 10.3390/biomedicines11041026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 03/17/2023] [Accepted: 03/22/2023] [Indexed: 03/29/2023] Open
Abstract
Left ventricular hypertrophy (LVH) is a common cardiovascular complication in end-stage kidney disease (ESKD) patients. We aimed at studying the association of LVH with adiponectin and leptin levels, cardiovascular stress/injury biomarkers and nutritional status in these patients. We evaluated the LV mass (LVM) and calculated the LVM index (LVMI) in 196 ESKD patients on dialysis; the levels of hemoglobin, calcium, phosphorus, parathyroid hormone, albumin, adiponectin, leptin, N-terminal pro B-type natriuretic peptide (NT-proBNP) and growth differentiation factor (GDF)-15 were analyzed. ESKD patients with LVH (n = 131) presented higher NT-proBNP and GDF-15, lower hemoglobin and, after adjustment for gender, lower leptin levels compared with non-LVH patients. LVH females also showed lower leptin than the non-LVH female group. In the LVH group, LVMI presented a negative correlation with leptin and a positive correlation with NT-proBNP. Leptin emerged as an independent determinant of LVMI in both groups, and NT-proBNP in the LVH group. Low hemoglobin and leptin and increased calcium, NT-proBNP and dialysis vintage are associated with an increased risk of developing LVH. In ESKD patients on dialysis, LVH is associated with lower leptin values (especially in women), which are negatively correlated with LVMI, and with higher levels of biomarkers of myocardial stress/injury. Leptin and NT-proBNP appear as independent determinants of LVMI; dialysis vintage, hemoglobin, calcium, NT-proBNP and leptin emerged as predicting markers for LVH development. Further studies are needed to better understand the role of leptin in LVH in ESKD patients.
Collapse
|
3
|
Singh RB, Fedacko J, Pella D, Fatima G, Elkilany G, Moshiri M, Hristova K, Jakabcin P, Vaňova N. High Exogenous Antioxidant, Restorative Treatment (Heart) for Prevention of the Six Stages of Heart Failure: The Heart Diet. Antioxidants (Basel) 2022; 11:antiox11081464. [PMID: 36009183 PMCID: PMC9404840 DOI: 10.3390/antiox11081464] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Revised: 07/08/2022] [Accepted: 07/19/2022] [Indexed: 01/06/2023] Open
Abstract
The exact pathophysiology of heart failure (HF) is not yet known. Western diet, characterized by highly sweetened foods, as well as being rich in fat, fried foods, red meat and processed meat, eggs, and sweet beverages, may cause inflammation, leading to oxidative dysfunction in the cardiac ultra-structure. Oxidative function of the myocardium and how oxidative dysfunction causes physio-pathological remodeling, leading to HF, is not well known. Antioxidants, such as polyphenolics and flavonoids, omega-3 fatty acids, and other micronutrients that are rich in Indo-Mediterranean-type diets, could be protective in sustaining the oxidative functions of the heart. The cardiomyocytes use glucose and fatty acids for the physiological functions depending upon the metabolic requirements of the heart. Apart from toxicity due to glucose, lipotoxicity also adversely affects the cardiomyocytes, which worsen in the presence of deficiency of endogenous antioxidants and deficiency of exogenous antioxidant nutrients in the diet. The high-sugar-and-high-fat-induced production of ceramide, advanced glycation end products (AGE) and triamino-methyl-N-oxide (TMAO) can predispose individuals to oxidative dysfunction and Ca-overloading. The alteration in the biology may start with normal cardiac cell remodeling to biological remodeling due to inflammation. An increase in the fat content of a diet in combination with inducible nitric oxide synthase (NOSi) via N-arginine methyl ester has been found to preserve the ejection fraction in HF. It is proposed that a greater intake of high exogenous antioxidant restorative treatment (HEART) diet, polyphenolics and flavonoids, as well as cessation of red meat intake and egg, can cause improvement in the oxidative function of the heart, by inhibiting oxidative damage to lipids, proteins and DNA in the cell, resulting in beneficial effects in the early stage of the Six Stages of HF. There is an unmet need to conduct cohort studies and randomized, controlled studies to demonstrate the role of the HEART diet in the treatment of HF.
Collapse
Affiliation(s)
- Ram B. Singh
- Halberg Hospital and Research Institute, Moradabad 244001, India;
| | - Jan Fedacko
- Department of Gerontology and Geriatric, Medipark, University Research Park, PJ Safarik University, 040-11 Kosice, Slovakia
- Correspondence:
| | - Dominik Pella
- Department of Cardiology, Faculty of Medicine and East Slovak, Institute for Cardiovascular Disease, PJ Safarik University, 040-11 Kosice, Slovakia;
| | - Ghizal Fatima
- Department of Biotechnology, Era University, Lucknow 226001, India;
| | - Galal Elkilany
- International College of Cardiology, Laplace, LA 90001, USA;
| | - Mahmood Moshiri
- International College of Cardiology, Richmond Hill, ON LL-9955, Canada;
| | - Krasimira Hristova
- Department of Cardiology, National University Hospital, 1000 Sofia, Bulgaria;
| | - Patrik Jakabcin
- Department of Social and Clinical Pharmacy, Faculty of Pharmacy in Hradec Králové, Charles University, 10000 Prague, Czech Republic;
| | - Natalia Vaňova
- Department of Internal Medicine UPJS MF and AGEL Hospital, Research Park, PJ Safaric University, 040-11 Kosice, Slovakia;
| |
Collapse
|
4
|
da Silva FA, Freire LS, da Rosa Lima T, Santos SF, de França Lemes SA, Gai BM, Colodel EM, Avila ETP, Damazo AS, Pereira MP, Kawashita NH. Introduction of the high-fat and very high-fat diets associated with fructose drink in critical development periods causes cardiovascular damage in rats in the beginning of adult life. Nutrition 2022; 101:111689. [DOI: 10.1016/j.nut.2022.111689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 03/22/2022] [Accepted: 04/05/2022] [Indexed: 11/29/2022]
|
5
|
Smiianov VA, Fartushok TV, Rudenko LA, Fartushok NV. THE ROLE OF LEPTINRESISTANCE IN THE PATHOGENESIS OF OBESITY IN PREGNANT WOMEN. WIADOMOSCI LEKARSKIE (WARSAW, POLAND : 1960) 2022; 75:1274-1283. [PMID: 35758443 DOI: 10.36740/wlek202205208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
OBJECTIVE The aim: To investigate the relationship between leptin resistance, lipid and carbohydrate metabolism, blood pressure in obese pregnant women. PATIENTS AND METHODS Materials and methods: Under observation were 65 women (main group) with obesity (I degree -27 women, II degree - 24 women, III degree - 14 women) in the II trimester of pregnancy, who were hospitalized in the Department of Pathology of Pregnancy KNP «Maternity Clinical house №1 "in Lviv during 2017-2020 on preeclampsia of varying severity, which were sent for inpatient treatment by women's clinics. The control group consisted of 30 healthy pregnant women without obesity. RESULTS Results: Serum leptin in obese women was directly correlated with BMI (r = 0.66, p<0.001), body weight (r = 0.29, p<0.05), total cholesterol (cholesterol) (r = 0, 37, p<0,009), low density lipoproteins (LDL cholesterol) (r = 0.33, p<0.05) and inversely with high density particles (HDL cholesterol) (r = -0.37, p<0.02 ). Studies of carbohydrate metabolism indicate the following correlation coefficients of BMI with glucose level r = 0.351; p<0,001, BMI with the level of C-peptide r = 0,450; p<0,001, BMI with HOMA index r = 0,1504; p = 0.036. Inverse correlations of C-peptide were detected with the level of P (r = -0.169; p = 0.025). CONCLUSION Conclusions: The discovery of the relationship between leptin resistance, lipid and carbohydrate metabolism, blood pressure indicates the possibility of using signs of leptin resistance to prevent complications during pregnancy in the second trimester.
Collapse
|
6
|
Obesity-associated cardiovascular risk in women: hypertension and heart failure. Clin Sci (Lond) 2021; 135:1523-1544. [PMID: 34160010 DOI: 10.1042/cs20210384] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 05/14/2021] [Accepted: 06/07/2021] [Indexed: 02/07/2023]
Abstract
The pathogenesis of obesity-associated cardiovascular diseases begins long prior to the presentation of a cardiovascular event. In both men and women, cardiovascular events, and their associated hospitalizations and mortality, are often clinically predisposed by the presentation of a chronic cardiovascular risk factor. Obesity increases the risk of cardiovascular diseases in both sexes, however, the clinical prevalence of obesity, as well as its contribution to crucial cardiovascular risk factors is dependent on sex. The mechanisms via which obesity leads to cardiovascular risk is also discrepant in women between their premenopausal, pregnancy and postmenopausal phases of life. Emerging data indicate that at all reproductive statuses and ages, the presentation of a cardiovascular event in obese women is strongly associated with hypertension and its subsequent chronic risk factor, heart failure with preserved ejection fraction (HFpEF). In addition, emerging evidence indicates that obesity increases the risk of both hypertension and heart failure in pregnancy. This review will summarize clinical and experimental data on the female-specific prevalence and mechanisms of hypertension and heart failure in women across reproductive stages and highlight the particular risks in pregnancy as well as emerging data in a high-risk ethnicity in women of African ancestry (AA).
Collapse
|
7
|
Leptin levels predict the development of left ventricular hypertrophy in a sample of adult men: the Olivetti Heart Study. J Hypertens 2020; 39:692-697. [PMID: 33060451 DOI: 10.1097/hjh.0000000000002687] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
OBJECTIVE A higher leptin (LPT) is associated with a greater cardiometabolic risk. Some studies also showed a positive association between LPT and cardiovascular organ damage but no consistent data are available about a predictive role of LPT on cardiac remodelling. Hence, the aim of this study was to evaluate the potential role of LPT on the incidence of left ventricular hypertrophy (LVH) in a sample of adult men. METHODS The study population was made up of 439 individuals (age: 51 years) without LVH at baseline, participating in The Olivetti Heart Study. The ECG criteria were adopted to exclude LVH at baseline and echocardiogram criteria for diagnosis of LVH at follow-up were considered. RESULTS At baseline, LPT was significantly and positively correlated with BMI, waist circumference, ECG indices, SBP and DBP but not with age and renal function. At the end of the 8-year follow-up period, there was an incidence of 23% in LVH by echocardiography. Individuals who developed LVH had higher baseline age, LPT, BMI, waist circumference, blood pressure and ECG indices (P < 0.05). Furthermore, those that had LPT above the median had greater risk to develop LVH (odds ratio: 1.7; P < 0.05). This association was also confirmed after adjustment for main confounders, among which changes in blood pressure and anthropometric indices. CONCLUSION The results of this study suggest a predictive role of circulating LPT levels on cardiac remodelling expressed by echocardiographic LVH, independently of body weight and blood pressure changes over the years.
Collapse
|
8
|
On the association between body fat and left ventricular mass. J Hypertens 2019; 37:1699-1704. [PMID: 31058795 DOI: 10.1097/hjh.0000000000002095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES As intervention studies have shown a reduction in body weight to be paralleled with a reduction in left ventricular mass (LVM), we quantified a hypothesized causal relationship between fat mass and LVM, and how much of these effects that was mediated by blood pressure (BP), diabetes and adipokines. Also visceral and subcutaneous adipose tissue (VAT and SAT) were explored in the same fashion. METHODS In the Prospective Study of the Vasculature in Uppsala Seniors study (n = 1016, 50% women, all aged 70 years), LVM was measured by echocardiography (indexed for lean mass, LVMI), fat and lean mass by dual-energy X-ray. VAT and SAT were measured by abdominal MRI (in n = 275). RESULTS In a structural equation model adjusting for sex, the total effect of fat mass on LVMI was large (standardized coefficient 0.280, P = 3.2 × 10, 95% confidence interval 0.210-0.349). Out of the total effect of fat mass on LVMI, 29.0% was mediated by BP and glucose (P = 2.4 × 10). The BP pathway was most important, mediating 24.4% of the total effect of fat mass on LVMI (P = 4.6 × 10), while the glucose pathway accounted for 4.6% (P = 0.033). The association of VAT with LVMI (0.202, P = 2.4 × 10) was slightly weaker than that of SAT with LVMI (0.283, P = 1.0 × 10). Of several measured adipokines, leptin was a significant mediator of the effect of fat mass on LVMI (P = 3.0 × 10). CONCLUSION One-third of the hypothesized association between body fat and LVMI was mediated by BP and glucose in this population-based cohort. Leptin was also an important mediator. Visceral adipose tissue was not more closely related to LVMI than subcutaneous abdominal fat.
Collapse
|
9
|
Kamimura D, Suzuki T, Wang W, deShazo M, Hall JE, Winniford MD, Kullo IJ, Mosley TH, Butler KR, Hall ME. Higher plasma leptin levels are associated with reduced left ventricular mass and left ventricular diastolic stiffness in black women: insights from the Genetic Epidemiology Network of Arteriopathy (GENOA) study. Hypertens Res 2018; 41:629-638. [PMID: 29907861 DOI: 10.1038/s41440-018-0062-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 01/13/2018] [Accepted: 01/22/2018] [Indexed: 12/11/2022]
Abstract
Our previous experimental animal data suggest a beneficial effect of leptin on LV structure and function. We hypothesized that leptin levels are associated with lower LV mass and myocardial stiffness which are important risk factors for the development of heart failure with preserved ejection fraction (HFpEF). We evaluated 1172 blacks, in which the prevalence of HFpEF is quite high, with preserved LV ejection fraction (EF > 50%) from the Genetic Epidemiology Network of Arteriopathy Study (mean age 62.9 years, 72% women), a community-based study to identify genes influencing blood pressure and target organ damage due to hypertension. Associations between leptin levels and indices of LV structure and function were evaluated using generalized estimating equations accounting for clustering in siblings. LV myocardial stiffness was evaluated using diastolic wall strain (DWS) measured by echocardiography. Analyses were stratified by sex because leptin levels were three times higher in women than men (p < 0.001). After adjustment for confounders, higher leptin levels were associated with lower LV mass (coefficient for 1 s.d. increase of leptin level: -5.825 g, 95% CI: -9.755 to -1.895 g, P = 0.004) and higher DWS (lower LV stiffness) (coefficient for 1 s.d. increase of leptin level: 0.009, 95% CI: 0.002-0.015, P = 0.007) in women. There were no statistically significant associations in men. In women, there were interactions between leptin levels and body mass index quartiles on LV mass and stiffness (p < 0.05 for both). Higher leptin levels were associated with lower LV mass and stiffness in obese but not lean black women.
Collapse
Affiliation(s)
- Daisuke Kamimura
- Divsion of Cardiology, University of Mississippi Medical Center, Jackson, MS, USA.
| | - Takeki Suzuki
- Divsion of Cardiology, University of Mississippi Medical Center, Jackson, MS, USA
| | - Wanmei Wang
- Center of Biostatistics & Bioinformatics, University of Mississippi Medical Center, Jackson, MS, USA
| | - Matthew deShazo
- Divsion of Cardiology, University of Mississippi Medical Center, Jackson, MS, USA
| | - John E Hall
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, MS, USA
| | - Michael D Winniford
- Divsion of Cardiology, University of Mississippi Medical Center, Jackson, MS, USA
| | - Iftikhar J Kullo
- Division of Cardiovascular Diseases, Department of Internal Medicine, Mayo Clinic, Rochester, MN, USA
| | - Thomas H Mosley
- Division of Geriatric Medicine, University of Mississippi Medical Center, Jackson, MS, USA
| | - Kenneth R Butler
- Division of Geriatric Medicine, University of Mississippi Medical Center, Jackson, MS, USA
| | - Michael E Hall
- Divsion of Cardiology, University of Mississippi Medical Center, Jackson, MS, USA.,Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, MS, USA
| |
Collapse
|
10
|
Alkholy UM, Ahmed IA, Karam NA, Ali YF, Yosry A. Assessment of left ventricular mass index could predict metabolic syndrome in obese children. J Saudi Heart Assoc 2016; 28:159-66. [PMID: 27358533 PMCID: PMC4917708 DOI: 10.1016/j.jsha.2015.06.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 05/02/2015] [Accepted: 06/10/2015] [Indexed: 01/20/2023] Open
Abstract
BACKGROUND Childhood obesity is a major risk factor for cardiovascular diseases in children and adults. OBJECTIVES The purpose of this study was to evaluate the serum leptin level and the cardiac changes in normotensive obese children and to study the relationship between left ventricular mass index (LVMI) and serum leptin with the parameters of metabolic syndrome (MS) in obese children. METHODS This study was conducted in al Jeddani Hospital and Ibn Sina College Hospital in Saudi Arabia in the period from July 2012 to December 2013, and included 82 obese children. Their mean age was 10.2 ± 2.8 years; they were divided into 25 obese children with MS and 57 obese children without MS, and 40 healthy age- and sex-matched children were also included in the study as a control group. All children were subjected to clinical assessment including standing height, body weight, body mass index (BMI), waist circumference (WC), and blood pressure measurements. All children received an echocardiographic examination (2-dimensional, M-mode, Doppler, and tissue Doppler echocardiograpy) and laboratory assessment of serum leptin level, fasting glucose, fasting insulin, the homeostatic model assessment for insulin resistance (HOMA) index, total cholesterol, triglycerides, and high- and low-density lipoprotein profile. RESULTS BMI, BMI standard deviation score, WC, fasting glucose, fasting insulin, HOMA index and the serum leptin level were significantly higher in obese children compared to control group (p < 0.05). The LVMI were increased in the obese compared to the control group (p < 0.001) while left ventricle systolic and diastolic functions did not differ in obese versus control group (p > 0.05). There was a significant positive correlation between both LVMI and serum leptin level in comparison to BMI, WC, fasting glucose, fasting insulin, HOMA, triglycerides, and low-density lipoprotein in all obese children, especially the MS group. However, there was a significant negative correlation between both LVMI and serum leptin level in comparison to high-density lipoprotein. CONCLUSION Assessment of LVMI as routine echocardiographic examinations and serum leptin level might be a feasible and reliable method for the evaluation of obesity and its related cardiovascular risks during childhood that can predict metabolic syndrome and insulin resistance.
Collapse
Affiliation(s)
| | - Ihab A. Ahmed
- Department of Pediatrics, Zagazig University, Zagazig, aEgypt
| | - Nehad A. Karam
- Department of Pediatrics, Zagazig University, Zagazig, aEgypt
| | | | - Ahmed Yosry
- Department of Cardiology, Zagazig University, Zagazig, bEgypt
| |
Collapse
|
11
|
Harhay MO, Kizer JR, Criqui MH, Lima JAC, Tracy R, Bluemke DA, Kawut SM. Adipokines and the Right Ventricle: The MESA-RV Study. PLoS One 2015; 10:e0136818. [PMID: 26348768 PMCID: PMC4562601 DOI: 10.1371/journal.pone.0136818] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Accepted: 08/10/2015] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVE Obesity is associated with changes in both right (RV) and left (LV) ventricular morphology, but the biological basis of this finding is not well established. We examined whether adipokine levels were associated with RV morphology and function in a population-based multiethnic sample free of clinical cardiovascular disease. METHODS We examined relationships of leptin, resistin, TNF-α, and adiponectin with RV morphology and function (from cardiac MRI) in participants (n = 1,267) free of clinical cardiovascular disease from the Multi-Ethnic Study of Atherosclerosis (MESA)-RV study. Multivariable regressions (linear, quantile [25th and 75th] and generalized additive models [GAM]) were used to examine the independent association of each adipokine with RV mass, RV end-diastolic volume (RVEDV), RV end-systolic volume (RVESV), RV stroke volume (RVSV) and RV ejection fraction (RVEF). RESULTS Higher leptin levels were associated with significantly lower levels of RV mass, RVEDV, RVESV and stroke volume, but not RVEF, after adjustment for age, gender, race, height and weight. These associations were somewhat attenuated but still significant after adjustment for traditional risk factors and covariates, and were completely attenuated when correcting for the respective LV measures. There were no significant interactions of age, gender, or race/ethnicity on the relationship between the four adipokines and RV structure or function. CONCLUSIONS Leptin levels are associated with favorable RV morphology in a multi-ethnic population free of cardiovascular disease, however these associations may be explained by a yet to be understood bi-ventricular process as this association was no longer present after adjustment for LV values. These findings complement the associations previously shown between adipokines and LV structure and function in both healthy and diseased patients. The mechanisms linking adipokines to healthy cardiovascular function require further investigation.
Collapse
Affiliation(s)
- Michael O. Harhay
- Penn Cardiovascular Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Jorge R. Kizer
- Department of Medicine, Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, New York, United States of America
| | - Michael H. Criqui
- Department of Family Medicine and Public Health, University of California San Diego, San Diego, California, United States of America
| | - João A. C. Lima
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Russell Tracy
- Department of Laboratory Medicine, University of Vermont School of Medicine, Burlington, Vermont, United States of America
| | - David A. Bluemke
- Radiology and Imaging Sciences, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health/Clinical Center, Bethesda, Maryland, United States of America
| | - Steven M. Kawut
- Penn Cardiovascular Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- * E-mail:
| |
Collapse
|
12
|
Sharma S, Colangelo LA, Allison MA, Lima JAC, Ambale-Venkatesh B, Kishi S, Liu K, Greenland P. Association of serum leptin with future left ventricular structure and function: The Multi-Ethnic Study of Atherosclerosis (MESA). Int J Cardiol 2015; 193:64-8. [PMID: 26005181 DOI: 10.1016/j.ijcard.2015.05.068] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 05/11/2015] [Indexed: 01/01/2023]
Abstract
BACKGROUND/OBJECTIVES Earlier studies differ on whether serum leptin is associated with adverse or beneficial cardiac structure. We determined the association between serum leptin with subsequent cardiac structure and function. METHODS MESA is a multicenter longitudinal study of Black, White, Hispanic and Asian-American men and women. Cardiac MRI (CMR) was completed 6 to 8 years after leptin was measured. Left ventricular (LV) mass and volumes were indexed to body surface area. Multivariable linear regression models were constructed to assess the associations between leptin and risk factor adjusted (age, race, gender, systolic blood pressure, anti-hypertensive usage, LDL, HDL, hyperlipidemia medication usage, diabetes, diabetic medication usage, chronic kidney disease, alcohol and tobacco use, adiponectin and BMI) CMR variables. RESULTS Relative to participants in the lowest quintile of leptin concentration, participants in the highest quintile had a lower risk factor adjusted LV mass (-14 g), LV mass index (-9 g/m(2)), LV end diastolic volume index (LVEDVi) (-7 ml/m(2)), LV end systolic volume index (LVESVi) (-3 ml/m(2)) and stroke volume (-5 ml) (all p≤0.05). On regression analysis, a doubling of leptin concentration was associated with lower LV mass (-2.5 g ± 0.7 g), LV mass index (-1.7 ± 0.3g/m(2)), LVEDVi (-1.5 ± 0.4 ml/m(2)), LVESVi (-0.7 ± 0.2 ml/m(2)) and stroke volume (-1.0 ± 0.5 ml) (all p ≤ 0.05). CONCLUSIONS Higher leptin was associated with more favorable subsequent cardiac structure. Further study is needed to assess the prognostic and therapeutic implications of these observations.
Collapse
Affiliation(s)
- Shishir Sharma
- Northwestern University Feinberg School of Medicine, Chicago, IL, United States
| | - Laura A Colangelo
- Northwestern University Feinberg School of Medicine, Chicago, IL, United States
| | | | - Joao A C Lima
- Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | | | - Satoru Kishi
- Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Kiang Liu
- Northwestern University Feinberg School of Medicine, Chicago, IL, United States
| | - Philip Greenland
- Northwestern University Feinberg School of Medicine, Chicago, IL, United States.
| |
Collapse
|
13
|
Ghantous CM, Azrak Z, Hanache S, Abou-Kheir W, Zeidan A. Differential Role of Leptin and Adiponectin in Cardiovascular System. Int J Endocrinol 2015; 2015:534320. [PMID: 26064110 PMCID: PMC4433709 DOI: 10.1155/2015/534320] [Citation(s) in RCA: 129] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2014] [Accepted: 04/23/2015] [Indexed: 02/07/2023] Open
Abstract
Leptin and adiponectin are differentially expressed adipokines in obesity and cardiovascular diseases. Leptin levels are directly associated with adipose tissue mass, while adiponectin levels are downregulated in obesity. Although significantly produced by adipocytes, leptin is also produced by vascular smooth muscle cells and cardiomyocytes. Plasma leptin concentrations are elevated in cases of cardiovascular diseases, such as hypertension, congestive heart failure, and myocardial infarction. As for the event of left ventricular hypertrophy, researchers have been stirring controversy about the role of leptin in this form of cardiac remodeling. In this review, we discuss how leptin has been shown to play an antihypertrophic role in the development of left ventricular hypertrophy through in vitro experiments, population-based cross-sectional studies, and longitudinal cohort studies. Conversely, we also examine how leptin may actually promote left ventricular hypertrophy using in vitro analysis and human-based univariate and multiple linear stepwise regression analysis. On the other hand, as opposed to leptin's generally detrimental effects on the cardiovascular system, adiponectin is a cardioprotective hormone that reduces left ventricular and vascular hypertrophy, oxidative stress, and inflammation. In this review, we also highlight adiponectin signaling and its protective actions on the cardiovascular system.
Collapse
Affiliation(s)
- C. M. Ghantous
- Department of Anatomy, Cell biology and Physiology, American University of Beirut, DTS-255, P.O. Box 11-0236, Beirut 1107-2020, Lebanon
| | - Z. Azrak
- Department of Pharmacology and Toxicology, American University of Beirut, DTS-255, P.O. Box 11-0236, Beirut 1107-2020, Lebanon
| | - S. Hanache
- Department of Anatomy, Cell biology and Physiology, American University of Beirut, DTS-255, P.O. Box 11-0236, Beirut 1107-2020, Lebanon
| | - W. Abou-Kheir
- Department of Anatomy, Cell biology and Physiology, American University of Beirut, DTS-255, P.O. Box 11-0236, Beirut 1107-2020, Lebanon
| | - A. Zeidan
- Department of Anatomy, Cell biology and Physiology, American University of Beirut, DTS-255, P.O. Box 11-0236, Beirut 1107-2020, Lebanon
- *A. Zeidan:
| |
Collapse
|
14
|
Allison MA, Jenny NS, McClelland RL, Cushman M, Rifkin D. The associations of adipokines with selected markers of the renin-angiotensinogen-aldosterone system: the multi-ethnic study of atherosclerosis. J Hum Hypertens 2014; 29:127-33. [PMID: 24919752 PMCID: PMC4265023 DOI: 10.1038/jhh.2014.40] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2013] [Revised: 04/22/2014] [Accepted: 05/01/2014] [Indexed: 12/24/2022]
Abstract
Among obese individuals, increased sympathetic nervous system activity results in increased renin and aldosterone production, as well as renal tubular sodium reabsorption. This study determined the associations between adipokines and selected measures of the reninangiotensinogen-aldosterone system (RAAS). The sample was 1,970 men and women from the Multi-Ethnic Study of Atherosclerosis who were free of clinical cardiovascular disease at baseline and had blood assayed for adiponectin, leptin, plasma renin activity (PRA) and aldosterone. The mean age was 64.7 years and 50% were female. The mean (SD) PRA and aldosterone were 1.45 (0.56) ng/ml and 150.1 (130.5) pg/ml, respectively. After multivariable adjustment, a 1-SD increment of leptin was associated with a 0.55 ng/ml higher PRA and 8.4 pg/ml higher aldosterone (p < 0.01 for both). Although adiponectin was not significantly associated with PRA levels, the same increment in this adipokine was associated with lower aldosterone levels (−5.5 pg/ml, p = 0.01). Notably, the associations between aldosterone and both leptin and adiponectin were not materially changed with additional adjustment for PRA. Exclusion of those taking anti-hypertensive medications modestly attenuated the associations. The associations between leptin and both PRA and aldosterone were not different by gender but were significantly stronger among non-Hispanic Whites and Chinese Americans than African and Hispanic Americans (p < 0.01). The findings suggest that both adiponectin and leptin may relevant to blood pressure regulation via the RAAS, that the associations appear to be robust to anti-hypertension medication use and that the associations are likely different by ethnicity.
Collapse
Affiliation(s)
- M A Allison
- Department of Family and Preventive Medicine, University of California-San Diego, La Jolla, CA, USA
| | - N S Jenny
- Department of Pathology, University of Vermont College of Medicine, Burlington, VT, USA
| | - R L McClelland
- Department of Biostatistics, University of Washington, Seattle, WA, USA
| | - M Cushman
- Department of Pathology, University of Vermont College of Medicine, Burlington, VT, USA
| | - D Rifkin
- 1] Department of Family and Preventive Medicine, University of California-San Diego, La Jolla, CA, USA [2] Department of Medicine, University of California-San Diego, La Jolla, CA, USA
| |
Collapse
|
15
|
Sabbatini AR, Faria AP, Barbaro NR, Gordo WM, Modolo RGP, Pinho C, Fontana V, Moreno H. Deregulation of adipokines related to target organ damage on resistant hypertension. J Hum Hypertens 2013; 28:388-92. [PMID: 24284384 DOI: 10.1038/jhh.2013.118] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Revised: 10/10/2013] [Accepted: 10/15/2013] [Indexed: 12/31/2022]
Abstract
Resistant hypertension (RHTN) includes patients with controlled blood pressure (BP) (CRHTN) and uncontrolled BP (UCRHTN). In fact, RHTN patients are more likely to have target organ damage (TOD), and resistin, leptin and adiponectin may affect BP control in these subjects. We assessed the relationship between adipokines levels and arterial stiffness, left ventricular hypertrophy (LVH) and microalbuminuria (MA). This cross-sectional study included CRHTN (n=51) and UCRHTN (n=38) patients for evaluating body mass index, ambulatory blood pressure monitoring, plasma adiponectin, leptin and resistin concentrations, pulse wave velocity (PWV), MA and echocardiography. Leptin and resistin levels were higher in UCRHTN, whereas adiponectin levels were lower in this same subgroup. Similarly, arterial stiffness, LVH and MA were higher in UCRHTN subgroup. Adiponectin levels negatively correlated with PWV (r=-0.42, P<0.01), and MA (r=-0.48, P<0.01) only in UCRHTN. Leptin was positively correlated with PWV (r=0.37, P=0.02) in UCRHTN subgroup, whereas resistin was not correlated with TOD in both subgroups. Adiponectin is associated with arterial stiffness and renal injury in UCRHTN patients, whereas leptin is associated with arterial stiffness in the same subgroup. Taken together, our results showed that those adipokines may contribute to vascular and renal damage in UCRHTN patients.
Collapse
Affiliation(s)
- A R Sabbatini
- Laboratory of Cardiovascular Pharmacology, Faculty of Medical Sciences and Teaching Hospital, University of Campinas (Unicamp), Campinas, São Paulo, Brazil
| | - A P Faria
- Laboratory of Cardiovascular Pharmacology, Faculty of Medical Sciences and Teaching Hospital, University of Campinas (Unicamp), Campinas, São Paulo, Brazil
| | - N R Barbaro
- Laboratory of Cardiovascular Pharmacology, Faculty of Medical Sciences and Teaching Hospital, University of Campinas (Unicamp), Campinas, São Paulo, Brazil
| | - W M Gordo
- Laboratory of Cardiovascular Pharmacology, Faculty of Medical Sciences and Teaching Hospital, University of Campinas (Unicamp), Campinas, São Paulo, Brazil
| | - R G P Modolo
- Laboratory of Cardiovascular Pharmacology, Faculty of Medical Sciences and Teaching Hospital, University of Campinas (Unicamp), Campinas, São Paulo, Brazil
| | - C Pinho
- Faculty of Medicine, Pontifical Catholic University of Campinas (Puccamp), Campinas, São Paulo, Brazil
| | - V Fontana
- Laboratory of Cardiovascular Pharmacology, Faculty of Medical Sciences and Teaching Hospital, University of Campinas (Unicamp), Campinas, São Paulo, Brazil
| | - H Moreno
- Laboratory of Cardiovascular Pharmacology, Faculty of Medical Sciences and Teaching Hospital, University of Campinas (Unicamp), Campinas, São Paulo, Brazil
| |
Collapse
|
16
|
Allison MA, Bluemke DA, McClelland R, Cushman M, Criqui MH, Polak JF, Lima JA. Relation of leptin to left ventricular hypertrophy (from the Multi-Ethnic Study of Atherosclerosis). Am J Cardiol 2013; 112:726-30. [PMID: 23711806 PMCID: PMC3745795 DOI: 10.1016/j.amjcard.2013.04.053] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Revised: 04/19/2013] [Accepted: 04/19/2013] [Indexed: 01/21/2023]
Abstract
Increasing adiposity increases the risk for left ventricular (LV) hypertrophy. Adipokines are hormone-like substances from adipose tissue that influence several metabolic pathways relevant to LV hypertrophy. Data were obtained from participants enrolled in the Multi-Ethnic Study of Atherosclerosis (MESA) who underwent magnetic resonance imaging of the heart and who also had fasting venous blood assayed for 4 distinct adipokines (adiponectin, leptin, tumor necrosis factor-α, and resistin). One-thousand four hundred sixty four MESA participants had complete data. The mean age was 61.5 years, the mean body mass index was 27.6 kg/m², and 49% were women. With adjustment for age, gender, race, height, and weight, multivariate linear regression modeling revealed that a 1-SD increment in leptin was significantly associated with smaller LV mass (ß: -4.66% predicted, p <0.01), LV volume (-5.87% predicted, p <0.01), stroke volume (-3.23 ml, p <0.01), and cardiac output (-120 ml/min, p = 0.01) as well as a lower odds ratio for the presence of LV hypertrophy (odds ratio 0.65, p <0.01), but a higher ejection fraction (0.44%, p = 0.05). Additional adjustment for the traditional cardiovascular disease risk factors, insulin resistance, physical activity, education, income, inflammatory biomarkers, other selected adipokines, and pericardial fat did not materially change the magnitude or significance of the associations. The associations between the other adipokines and LV structure and function were inconsistent and largely nonsignificant. In conclusion, the results indicate that higher levels of leptin are associated with more favorable values of several measures of LV structure and function.
Collapse
Affiliation(s)
- Matthew A Allison
- Department of Family and Preventive Medicine, University of California San Diego, San Diego, CA, USA.
| | | | | | | | | | | | | |
Collapse
|
17
|
Stanley WC, Dabkowski ER, Ribeiro RF, O'Connell KA. Dietary fat and heart failure: moving from lipotoxicity to lipoprotection. Circ Res 2012; 110:764-76. [PMID: 22383711 PMCID: PMC3356700 DOI: 10.1161/circresaha.111.253104] [Citation(s) in RCA: 89] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2011] [Accepted: 01/27/2011] [Indexed: 02/07/2023]
Abstract
There is growing evidence suggesting that dietary fat intake affects the development and progression of heart failure. Studies in rodents show that in the absence of obesity, replacing refined carbohydrate with fat can attenuate or prevent ventricular expansion and contractile dysfunction in response to hypertension, infarction, or genetic cardiomyopathy. Relatively low intake of n-3 polyunsaturated fatty acids from marine sources alters cardiac membrane phospholipid fatty acid composition, decreases the onset of new heart failure, and slows the progression of established heart failure. This effect is associated with decreased inflammation and improved resistance to mitochondrial permeability transition. High intake of saturated, monounsaturated, or n-6 polyunsaturated fatty acids has also shown beneficial effects in rodent studies. The underlying mechanisms are complex, and a more thorough understanding is needed of the effects on cardiac phospholipids, lipid metabolites, and metabolic flux in the normal and failing heart. In summary, manipulation of dietary fat intake shows promise in the prevention and treatment of heart failure. Clinical studies generally support high intake of n-3 polyunsaturated fatty acids from marine sources to prevent and treat heart failure. Additional clinical and animals studies are needed to determine the optimal diet in terms of saturated, monounsaturated, and n-6 polyunsaturated fatty acids intake for this vulnerable patient population.
Collapse
Affiliation(s)
- William C Stanley
- Division of Cardiology, Department of Medicine, University of Maryland, Baltimore, MD 21201, USA.
| | | | | | | |
Collapse
|
18
|
Hickson DA, Burchfiel CM, Petrini MF, Liu J, Campbell-Jenkins BW, Bhagat R, Marshall GD. Leptin is inversely associated with lung function in African Americans, independent of adiposity: the Jackson Heart Study. Obesity (Silver Spring) 2011; 19:1054-61. [PMID: 20966906 DOI: 10.1038/oby.2010.240] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Leptin, a 16-kDa protein, has proinflammatory properties and has been linked to respiratory physiological responses in majority white populations. Little is known, however, about the relationship of leptin with lung function in nonwhites. Cross-sectional associations of circulating serum leptin concentrations with forced expiratory volume in 1 s (FEV(1)), FEV in 6 s (FEV(6)), and vital capacity (FVC), assessed by spirometry, were examined in 4,679 African-American men and women participants (54.3 ± 12.4 years; 62.7% women) in the Jackson Heart Study (JHS). The independent association of leptin was examined in relation to FEV(1), FEV(6), and FVC% predicted after adjustment for age, education, smoking status, pack-years of cigarette smoking, respiratory medication use, and menopausal status in women; additional adjustment included total body weight, waist circumference, and BMI. Serum leptin was inversely related to FEV(1), FEV(6), and FVC% predicted values in men. A dose-response relationship was observed with men in the highest leptin quartile having a significantly lower lung function compared to men in the lower leptin quartile. BMI significantly modified this relationship in women: leptin was most consistently associated with lung function in obese women, less consistent in overweight women, and absent in normal-weight women. Serum leptin concentration was strongly, inversely, and independently associated with lung function in African Americans, especially African-American men and obese women.
Collapse
Affiliation(s)
- DeMarc A Hickson
- Jackson State University, Jackson Heart Study, Jackson, Mississippi, USA.
| | | | | | | | | | | | | |
Collapse
|
19
|
Mascareno E, Beckles D, Dhar-Mascareno M, Siddiqui MAQ. Enhanced hypertrophy in ob/ob mice due to an impairment in expression of atrial natriuretic peptide. Vascul Pharmacol 2009; 51:198-204. [PMID: 19560554 DOI: 10.1016/j.vph.2009.06.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2009] [Revised: 04/23/2009] [Accepted: 06/18/2009] [Indexed: 12/22/2022]
Abstract
RATIONALE We investigated the molecular mechanism(s) that play a role in leptin signaling during the development of left ventricular hypertrophy (LVH) due to pressure overload. To this end, ob/ob leptin deficient and C57BL/6J control mice were subjected transverse aortic constriction (TAC). METHODS Control sham C57BL/6J and ob/ob mice, along with C57BL/6J and ob/ob leptin deficient mice were subjected transverse aortic constriction (TAC) for 15 days and then evaluated for morphological, physiological, and molecular changes associated with pressure overload hypertrophy. RESULTS Evaluation by echocardiography revealed a significant increase in left ventricular mass (LVmass) and wall thickness in ob/ob mice subjected to transverse aortic constriction (TAC) as compared to C57BL/6J. Analysis of the expression of molecular markers of LVH, such as atrial natriuretic peptide (ANP), revealed a blunted increase in the level of ANP in ob/ob mice as compared to C57BL/6J mice. We observed that leptin plays a role in modulating the transcriptional activity of the promoter of the ANP gene. Leptin acts by regulating NFATc4, a member of the nuclear factor activated T cell (NFAT) family of transcription factors in cardiomyocytes. Our in vivo studies revealed that ob/ob mice subjected to TAC failed to activate the NFATc4 in the heart, however, intraperitoneal injection of leptin in ob/ob mice restored the NFATc4 DNA-binding activity and induced expression of the ANP gene. CONCLUSION This study establishes the role of leptin as an anti-hypertrophic agent during pressure overload hypertrophy, and suggests that a key molecular event is the leptin mediated activation of NFATc4 that regulates the transcriptional activation of the ANP gene promoter.
Collapse
Affiliation(s)
- Eduardo Mascareno
- Center for Cardiovascular and Muscle Research, Department of Anatomy and Cell Biology, State University of New York Downstate Medical Center, 450 Clarkson Avenue, Brooklyn, NY 11203, USA.
| | | | | | | |
Collapse
|
20
|
Saraiva RM, Minhas KM, Zheng M, Pitz E, Treuer A, Gonzalez D, Schuleri KH, Vandegaer KM, Barouch LA, Hare JM. Reduced neuronal nitric oxide synthase expression contributes to cardiac oxidative stress and nitroso-redox imbalance in ob/ob mice. Nitric Oxide 2006; 16:331-8. [PMID: 17307368 PMCID: PMC2754218 DOI: 10.1016/j.niox.2006.12.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2006] [Revised: 11/04/2006] [Accepted: 12/05/2006] [Indexed: 01/12/2023]
Abstract
Disruption of leptin signaling in the heart may contribute to obesity-related cardiac disease, as leptin deficient (oblob) mice display cardiac hypertrophy, increased cardiac apoptosis and reduced survival. Since leptin maintains a tonic level of neuronal nitric oxide synthase (NOS1) expression in the brain, we hypothesized that leptin deficiency would decrease NOS1 cardiac expression, in turn activating xanthine oxidoreductase (XOR) and creating nitroso-redox imbalance. We studied 2- to 6-month-old oblob (n=26) and C57Bl/6 controls (n=27). Cardiac NOS1 protein abundance (P<0.01) and mRNA expression (P=0.03) were reduced in oblob (n=10 and 6, respectively), while NOS3 protein abundance and mRNA expression were unaltered. Importantly, cardiac NOS1 protein abundance was restored towards normal in oblob mice after leptin treatment (n=3; P<0.05 vs leptin untreated oblob mice). NO metabolite (nitrite and nitrate) production within the myocardium was also reduced in oblob mice (n=5; P=0.02). Furthermore, oxidative stress was increased in oblob mice as GSH/GSSG ratio was decreased (n=4; P=0.02). Whereas XOR activity measured by Amplex Red fluorescence was increased (n=8; P=0.04), XOR and NADPH oxidase subunits protein abundance were not changed in oblob mice (n=6). Leptin deficiency did not disrupt NOS1 subcellular localization, as NOS1 co-localized with ryanodine receptor but not with caveolin-3. In conclusion, leptin deficiency is linked to decreased cardiac expression of NOS1 and NO production, with a concomitant increase in XOR activity and oxidative stress, resulting in nitroso-redox imbalance. These data offer novel insights into potential mechanisms of myocardial dysfunction in obesity.
Collapse
Affiliation(s)
- Roberto M Saraiva
- Cardiology Division, Department of Medicine, Johns Hopkins Medical Institutions, Baltimore, MD 21205, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
21
|
The association between leptin and left ventricular hypertrophy: a population–based cross-sectional study. J Hypertens 2006. [DOI: 10.1097/01.hjh.0000234128.86390.b0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
22
|
Wannamethee SG, Tchernova J, Whincup P, Lowe GDO, Kelly A, Rumley A, Wallace AM, Sattar N. Plasma leptin: associations with metabolic, inflammatory and haemostatic risk factors for cardiovascular disease. Atherosclerosis 2006; 191:418-26. [PMID: 16712853 DOI: 10.1016/j.atherosclerosis.2006.04.012] [Citation(s) in RCA: 121] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2005] [Revised: 04/04/2006] [Accepted: 04/06/2006] [Indexed: 10/24/2022]
Abstract
BACKGROUND AND AIM Leptin, an adipocyte-derived protein, regulating food intake and metabolism has been implicated in the development of coronary heart disease. We have examined the relationship between leptin and vascular risk factors including insulin resistance, metabolic, inflammatory and haemostatic risk factors. METHODS AND RESULTS The study was carried out in 3640 non-diabetic men aged 60-79 years drawn from general practices in 24 British towns and who were not on warfarin. Leptin was strongly positively correlated with waist circumference (r=0.58; p<0.0001). Leptin concentrations decreased significantly with increasing physical activity and were lowered in cigarette smokers and elevated in men with pre-existing coronary heart disease and stroke; alcohol intake showed no association with leptin concentration. After adjustment for waist circumference and these lifestyle factors, increased leptin was independently associated with significant increases in insulin resistance, triglycerides, inflammatory markers (interleukin-6, C-reactive protein, fibrinogen, plasma viscosity), coagulation factor VIII, endothelial markers von Willebrand factor, tissue plasminogen activator, and fibrin D-dimer levels; and a decrease in HDL-cholesterol. No association was seen between leptin and blood pressure, total cholesterol, glucose or white cell count after adjusting for waist circumference. Further adjustment for insulin resistance abolished the relationships between leptin and triglycerides and HDL-cholesterol, weakened the associations with the haemostatic factors although they remained significant, but made minor differences to the associations with inflammatory markers. CONCLUSION Plasma leptin is associated with insulin resistance, inflammation and disturbances in haemostasis independent of waist circumference, suggesting possible pathways by which leptin may influence risk of cardiovascular disease.
Collapse
Affiliation(s)
- S Goya Wannamethee
- Department of Primary Care and Population Sciences, Royal Free and University College Medical School, Rowland Hill Street, London NW3 2PF, UK.
| | | | | | | | | | | | | | | |
Collapse
|
23
|
Abstract
Leptin is a 16-kDa protein secreted by white adipose tissue that is primarily involved in the regulation of food intake and energy expenditure. Plasma leptin concentration is proportional to the amount of adipose tissue and is markedly increased in obese individuals. Recent studies suggest that leptin is involved in cardiovascular complications of obesity, including arterial hypertension. Acutely administered leptin has no effect on blood pressure, probably because it concomitantly stimulates the sympathetic nervous system and counteracting depressor mechanisms such as natriuresis and nitric oxide (NO)-dependent vasorelaxation. By contrast, chronic hyperleptinemia increases blood pressure because these acute depressor effects are impaired and/or additional sympathetic nervous system-independent pressor effects appear, such as oxidative stress, NO deficiency, enhanced renal Na reabsorption and overproduction of endothelin. Although the cause-effect relationship between leptin and high blood pressure in humans has not been demonstrated directly, many clinical studies have shown elevated plasma leptin in patients with essential hypertension and a significant positive correlation between leptin and blood pressure independent of body adiposity both in normotensive and in hypertensive individuals. In addition, leptin may contribute to end-organ damage in hypertensive individuals such as left ventricular hypertrophy, retinopathy and nephropathy, independent of regulating blood pressure. Here, current knowledge about the role of leptin in the regulation of blood pressure and in the pathogenesis of arterial hypertension is presented.
Collapse
Affiliation(s)
- Jerzy Bełtowski
- Department of Pathophysiology, Medical University, Lublin, Poland.
| |
Collapse
|
24
|
Raju SVY, Zheng M, Schuleri KH, Phan AC, Bedja D, Saraiva RM, Yiginer O, Vandegaer K, Gabrielson KL, O’Donnell CP, Berkowitz DE, Barouch LA, Hare JM. Activation of the cardiac ciliary neurotrophic factor receptor reverses left ventricular hypertrophy in leptin-deficient and leptin-resistant obesity. Proc Natl Acad Sci U S A 2006; 103:4222-7. [PMID: 16537512 PMCID: PMC1449674 DOI: 10.1073/pnas.0510460103] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Disruption of the leptin signaling pathway within the heart causes left ventricular hypertrophy (LVH). Because human obesity is a syndrome of leptin resistance, which is not amenable to leptin treatment, the identification of parallel signal transduction pathways is of potential therapeutic value. Ciliary neurotrophic factor (CNTF), which acts parallel to leptin in the hypothalamus, is not previously recognized to have cardiac activity. We hypothesized that CNTF receptors are present on cardiomyocytes and their activation reverses LVH in both leptin-deficient ob/ob and leptin-resistant db/db mice. The localization of CNTF receptors (CNTFRalpha) to the sarcolemma in C57BL/6, ob/ob and db/db was confirmed in situ with immunohistochemistry, and immunoblotting (60 and 40 kDa) on isolated myocytes. ob/ob mice were randomly assigned to receive s.c. recombinant CNTF (CNTF(Ax15); 0.1 mg x kg(-1) per day; n = 11) calorie-restriction (n = 9), or feeding ad libitum (n = 11). db/db mice were allocated to three similar groups (n = 8, 7, and 8, respectively) plus a leptin group (1 mg x kg(-1) per day; n = 7). Echocardiography showed that CNTF(Ax15) reduced cardiac hypertrophy [posterior wall thickness decreased by 29 +/- 8% (P < 0.01) in ob/ob and by 21 +/- 3% in db/db mice (P < 0.01)], which was consistent with the reduction of myocyte width. Western blotting showed that leptin and CNTF(Ax15) activated Stat3 and ERK1/2 pathway in cultured adult mice cardiomyocytes and cardiac tissue from in ob/ob and db/db mice. Together, these findings support the role of a previously undescribed signaling pathway in obesity-associated cardiac hypertrophy and have therapeutic implications for patients with obesity-related cardiovascular disease and other causes of LVH.
Collapse
MESH Headings
- Animals
- Cell Size/drug effects
- Ciliary Neurotrophic Factor/pharmacology
- Humans
- Hypertrophy, Left Ventricular/complications
- Hypertrophy, Left Ventricular/metabolism
- Hypertrophy, Left Ventricular/pathology
- Hypertrophy, Left Ventricular/therapy
- Leptin/deficiency
- Leptin/physiology
- Mice
- Mice, Inbred C57BL
- Mice, Mutant Strains
- Mice, Obese
- Myocardium/metabolism
- Myocytes, Cardiac/drug effects
- Myocytes, Cardiac/pathology
- Obesity/complications
- Receptor, Ciliary Neurotrophic Factor/drug effects
- Receptor, Ciliary Neurotrophic Factor/metabolism
- Receptors, Leptin
- Recombinant Proteins/pharmacology
- Signal Transduction
Collapse
Affiliation(s)
| | - Meizi Zheng
- *Division of Cardiology and Institute for Cell Engineering
| | | | | | - Djahida Bedja
- *Division of Cardiology and Institute for Cell Engineering
| | | | - Omer Yiginer
- *Division of Cardiology and Institute for Cell Engineering
| | | | | | - Christopher P. O’Donnell
- Division of Pulmonary Medicine, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213
| | - Dan E. Berkowitz
- Department of Anesthesiology and Critical Care Medicine, Johns Hopkins Medical Institutions, Baltimore, MD 21205; and
| | | | - Joshua M. Hare
- *Division of Cardiology and Institute for Cell Engineering
- To whom correspondence should be addressed. E-mail:
| |
Collapse
|
25
|
Schulze PC, Kratzsch J. Leptin as a new diagnostic tool in chronic heart failure. Clin Chim Acta 2005; 362:1-11. [PMID: 16005450 DOI: 10.1016/j.cccn.2005.05.019] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2005] [Revised: 05/16/2005] [Accepted: 05/17/2005] [Indexed: 01/21/2023]
Abstract
Leptin, the product of the ob-gene, regulates cellular homeostasis and glycemic control. While initially described as an adipocyte-derived protein with expression and secretion restricted to adipose tissue, recent reports have shown local expression of leptin in several tissues including the skeletal muscle, heart, vessels and brain. Leptin acts through the different isoforms of its receptor which are ubiquitously expressed and can be detected in endothelium, vascular smooth muscle and myocardium. In addition to its metabolic effects, leptin has distinct effects in the cardiovascular system leading to increased production of proinflammatory cytokines and oxidative stress, vascular remodeling and neointima formation as well as cardiomyocyte hypertrophy. Notably, recent clinical studies have linked serum levels of leptin to the occurrence of cardiovascular events such as myocardial infarction and stroke suggesting that leptin promotes pro-atherogenic vascular mechanisms. In contrast, less is known about the role and effects of leptin in the setting of chronic heart failure. We here review the current knowledge on cardiovascular effects of leptin and discuss its potential as a new therapeutic tool in chronic heart failure.
Collapse
Affiliation(s)
- P Christian Schulze
- Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02139, USA.
| | | |
Collapse
|
26
|
Perego L, Pizzocri P, Corradi D, Maisano F, Paganelli M, Fiorina P, Barbieri M, Morabito A, Paolisso G, Folli F, Pontiroli AE. Circulating leptin correlates with left ventricular mass in morbid (grade III) obesity before and after weight loss induced by bariatric surgery: a potential role for leptin in mediating human left ventricular hypertrophy. J Clin Endocrinol Metab 2005; 90:4087-93. [PMID: 15855267 DOI: 10.1210/jc.2004-1963] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
CONTEXT Obesity is frequently associated with left ventricular hypertrophy, even when uncomplicated by hypertension or diabetes mellitus. Left ventricular hypertrophy is an important risk factor for congestive heart failure. OBJECTIVE The objective of this study was to evaluate the relationship between leptin and left ventricular mass in uncomplicated, morbid (grade 3) obesity and the existence of leptin receptors and intracellular signaling proteins in the human heart. DESIGN Left ventricular mass (LVM) was calculated through electrocardiogram reading in normotensive grade III obese patients (World Health Organization classification) undergoing bariatric surgery [laparoscopic adjustable gastric banding (LAGB)] at baseline and 1 yr later. The control group was composed of healthy lean normotensive subjects. Leptin receptors were detected by PCR and immunocytochemistry in human heart biopsies. SETTING This study was performed at university hospitals. PATIENTS Thirty-one grade 3 obese patients and 30 healthy nonobese normotensive, age- and sex-matched control subjects were studied. INTERVENTION Obese subjects underwent LAGB to induce weight loss and were evaluated at baseline and after 1 yr. RESULTS LVM, plasma leptin, glucose, insulin levels, and homeostasis model assessment index were higher in obese than in lean controls (P < 0.01); at univariate regression analysis, LVM correlated with body mass index, leptin, and homeostasis model assessment index; at multiple regression analysis, LVM only correlated with leptin levels (P = 0.001). Obese subjects were reevaluated 1 yr after LAGB, when their body mass index changed from 46.2 +/- 1.24 to 36.6 +/- 1.05 kg/m(2) (P < 0.01); the decrease in LVM correlated only with the decrease in leptin levels (P < 0.01). We demonstrated that long and short isoforms of the leptin receptor and intracellular proteins mediating leptin signaling were expressed in human heart by RT-PCR, immunocytochemistry, or both methods. CONCLUSIONS These data suggest that leptin could contribute to the left ventricular hypertrophy in humans.
Collapse
Affiliation(s)
- Lucia Perego
- Divisione di Medicina Interna, Istituto Scientifico San Raffaele, Via Olgettina 60, 20132 Milan, Italy
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
27
|
Minhas KM, Khan SA, Raju SVY, Phan AC, Gonzalez DR, Skaf MW, Lee K, Tejani AD, Saliaris AP, Saliaris AP, Barouch LA, O'Donnell CP, Emala CW, Berkowitz DE, Hare JM. Leptin repletion restores depressed {beta}-adrenergic contractility in ob/ob mice independently of cardiac hypertrophy. J Physiol 2005; 565:463-74. [PMID: 15760936 PMCID: PMC1464532 DOI: 10.1113/jphysiol.2005.084566] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Revised: 02/16/2005] [Accepted: 03/07/2005] [Indexed: 12/12/2022] Open
Abstract
Impaired leptin signalling in obesity is increasingly implicated in cardiovascular pathophysiology. To explore mechanisms for leptin activity in the heart, we hypothesized that physiological leptin signalling participates in maintaining cardiac beta-adrenergic regulation of excitation-contraction coupling. We studied 10-week-old (before development of cardiac hypertrophy) leptin-deficient (ob/ob, n=12) and C57Bl/6 (wild-type (WT), n=15) mice at baseline and after recombinant leptin infusion (0.3 mg kg-1 day-1 for 28 days, n=6 in each group). Ob/ob-isolated myocytes had attenuated sarcomere shortening and calcium transients ([Ca2+]i) versus WT (P<0.01 for both) following stimulation of the beta-receptor (with isoproterenol (isoprenaline)) or at the post-receptor level (with forskolin and dibutryl-cAMP). In addition, sarcoplasmic reticulum (SR) Ca2+ stores were depressed. Leptin replenishment in ob/ob mice restored each of these abnormalities towards normal without affecting gross (wall thickness) or microscopic (cell size) measures of cardiac architecture. Immunoblots revealed alterations of several proteins involved in excitation-contraction coupling in the ob/ob mice, including decreased abundance of Gsalpha-52 kDa, as well as alterations in the expression of Ca2+ cycling proteins (increased SR Ca2+-ATPase, and depressed phosphorylated phospholamban). In addition, protein kinase A (PKA) activity in ob/ob mice was depressed at baseline and correctable towards the activity found in WT with leptin repletion, a finding that could account for impaired beta-adrenergic responsiveness. Taken together, these data reveal a novel link between the leptin signalling pathway and normal cardiac function and suggest a mechanism by which leptin deficiency or resistance may lead to cardiac depression.
Collapse
Affiliation(s)
- Khalid M Minhas
- The Johns Hopkins Medical Institutions, Cardiology Division, 720 Rutland Avenue, Ross 1059, Baltimore, MD 21205, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Shin HJ, Oh J, Kang SM, Lee JH, Shin MJ, Hwang KC, Jang Y, Chung JH. Leptin induces hypertrophy via p38 mitogen-activated protein kinase in rat vascular smooth muscle cells. Biochem Biophys Res Commun 2005; 329:18-24. [PMID: 15721267 DOI: 10.1016/j.bbrc.2004.12.195] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2004] [Indexed: 11/30/2022]
Abstract
The hypertrophy of vascular smooth muscle cells (VSMCs) is critical in vascular remodeling associated with hypertension, atherosclerosis, and restenosis. Recently, leptin has appeared to play a pivotal role in vascular remodeling. However, the mechanism by which leptin induces hypertrophy in vascular smooth muscle cells is still unknown. We studied the role of leptin as a potential hypertrophic factor in rat VSMCs. In the present study, leptin significantly increased [(3)H]leucine incorporation and the total protein/DNA ratio in VSMCs. The maximal hypertrophic effect was at 100ng/ml of leptin. Leptin induced phosphorylation and activation of p38 mitogen-activated protein (p38 MAP) kinase and of signal transducers and activators of transcription 3 in a concentration- and time-dependent manner. A p38 MAP kinase inhibitor SB203580 significantly inhibited leptin-induced hypertrophy, AG490 (a JAK2 inhibitor) partially inhibited it, and other MAP kinase inhibitors, PD98059 (an ERK inhibitor) and SP600125 (a JNK inhibitor), had no effect. These results indicate that leptin directly stimulates cellular hypertrophy via p38 MAP kinase in rat VSMCs.
Collapse
MESH Headings
- Animals
- Anthracenes/pharmacology
- Aorta/metabolism
- Arteriosclerosis
- Blotting, Western
- Cells, Cultured
- DNA/metabolism
- DNA-Binding Proteins/metabolism
- Dose-Response Relationship, Drug
- Electrophoresis, Polyacrylamide Gel
- Enzyme Activation
- Enzyme Inhibitors/pharmacology
- Flavonoids/pharmacology
- Hypertrophy
- Leptin/metabolism
- Leucine/metabolism
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/pathology
- Myocytes, Smooth Muscle/cytology
- Myocytes, Smooth Muscle/metabolism
- Phosphorylation
- Rats
- Rats, Sprague-Dawley
- STAT3 Transcription Factor
- Time Factors
- Trans-Activators/metabolism
- Tyrphostins/pharmacology
- p38 Mitogen-Activated Protein Kinases/metabolism
Collapse
Affiliation(s)
- Hye-Jin Shin
- Yonsei Research Institute of Aging Science, Yonsei University, Seoul 120-749, Republic of Korea
| | | | | | | | | | | | | | | |
Collapse
|
29
|
Wolk R, Berger P, Lennon RJ, Brilakis ES, Johnson BD, Somers VK. Plasma leptin and prognosis in patients with established coronary atherosclerosis. J Am Coll Cardiol 2005; 44:1819-24. [PMID: 15519013 DOI: 10.1016/j.jacc.2004.07.050] [Citation(s) in RCA: 158] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2004] [Accepted: 07/28/2004] [Indexed: 01/03/2023]
Abstract
OBJECTIVES This study was designed to evaluate the relationship between plasma leptin and prognosis in patients with angiographically confirmed coronary atherosclerosis. BACKGROUND Experimental studies suggest that leptin, an adipose tissue-derived hormone, exerts important cardiovascular effects. METHODS Study subjects were recruited prospectively from a cohort of patients undergoing clinically indicated coronary angiography (n = 382). The median duration of follow-up was four years. Follow-up information was available for 361 patients. RESULTS The combined end point of cardiac death, myocardial infarction (MI), cerebrovascular accident, or re-vascularization occurred in 44 subjects. In the simple Cox model, leptin had a significant (p < 0.001) non-linear/cubic univariate relationship with the combined end point. Other variables associated with prognosis in the univariate analysis were body mass index (BMI), prior MI, insulin resistance, C-reactive protein (CRP), fibrinogen, and number of coronary vessels with >50% stenosis. A positive relationship between leptin and prognosis was also seen when leptin levels were split by quintiles, with a hazard ratio of 6.46 for the highest quintile. The only two variables significantly associated with the combined end point in the multivariate Cox model were leptin (p = 0.004) and number of coronary vessels with >50% stenosis (p < 0.001). A similar relationship between leptin and prognosis was observed when leptin was adjusted for BMI. CONCLUSIONS In patients with angiographically confirmed coronary atherosclerosis, leptin is a novel predictor of future cardiovascular events independent of other risk factors, including lipid status and CRP.
Collapse
Affiliation(s)
- Robert Wolk
- Cardiovascular Diseases, Mayo Clinic, Rochester, Minnesota, USA
| | | | | | | | | | | |
Collapse
|
30
|
Piñieiro R, Iglesias MJ, Eiras S, Viñuela J, Lago F, González-Juanatey JR. Leptin does not induce hypertrophy, cell cycle alterations, or production of MCP-1 in cultured rat and mouse cardiomyocytes. Endocr Res 2005; 31:375-86. [PMID: 16433256 DOI: 10.1080/07435800500456937] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Leptin has been proposed as an important mediator in cardiovascular pathophysiology. Patients with congestive heart failure (CHF) present high plasma leptin levels. CHF is generally preceded by myocardial remodeling involving hypertrophy, necrosis, and apoptosis. AIM To investigate whether leptin causes hypertrophy or cell cycle alterations, or induces MCP-1 synthesis in cardiomyocytes. METHODS Primary cultures of neonatal rat cardiomyocytes (PC) and murine cell line HL-1 were used. RT-PCR was used to identify Ob-Rb gene expression. Metabolic activity and proliferation of cardiomyocytes was studied using MTT and BrdU uptake, while apoptosis was assayed with Hoechst dye vital staining and flow cytometry. Measurement of the cell surface area was used to determine hypertrophy. MCP-1 levels were measured by ELISA. RESULTS RT-PCR showed Ob-Rb mRNA expression in HL-1 cells. Exposure to leptin induced no changes in metabolic activity, proliferation, and apoptotic rates, and did not alter cell cycle in cardiomyocytes. Leptin did not increase cell size of cardiomyocytes, and MCP-1 synthesis was not detected in PC and HL-1 cells treated with leptin. CONCLUSION This work shows that leptin does not induce changes in viability, proliferation, size or apoptosis of rat neonatal and HL-1 cardiomyocytes, and it does not induce MCP-1 secretion in these cells.
Collapse
MESH Headings
- Animals
- Apoptosis/drug effects
- Bisbenzimidazole/chemistry
- Cell Cycle/drug effects
- Cell Growth Processes/drug effects
- Cell Survival/drug effects
- Cells, Cultured
- Chemokine CCL2/biosynthesis
- Chemokine CCL2/genetics
- Female
- Leptin/pharmacology
- Male
- Mice
- Microscopy, Fluorescence
- Myocytes, Cardiac/cytology
- Myocytes, Cardiac/drug effects
- Myocytes, Cardiac/metabolism
- RNA, Messenger/biosynthesis
- RNA, Messenger/genetics
- Rats
- Rats, Sprague-Dawley
- Receptors, Cell Surface/biosynthesis
- Receptors, Cell Surface/genetics
- Receptors, Leptin
- Reverse Transcriptase Polymerase Chain Reaction
Collapse
Affiliation(s)
- Roberto Piñieiro
- Research Unit in Cardiology, University Clinical Hospital of Santiago de Compostela, Santiago de Compostela, Spain
| | | | | | | | | | | |
Collapse
|
31
|
Hiperleptinemia, hiperinsulinemia y síndrome metabólico en el riesgo cardiovascular: uno para todos y todos para uno. Med Clin (Barc) 2004. [DOI: 10.1016/s0025-7753(04)74667-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
32
|
Tritos NA, Manning WJ, Danias PG. Role of leptin in the development of cardiac hypertrophy in experimental animals and humans. Circulation 2004; 109:e67; author reply e67. [PMID: 14981017 DOI: 10.1161/01.cir.0000116424.65485.67] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|