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Eitmann S, Matrai P, Hegyi P, Balasko M, Eross B, Dorogi K, Petervari E. Obesity paradox in older sarcopenic adults - a delay in aging: A systematic review and meta-analysis. Ageing Res Rev 2024; 93:102164. [PMID: 38103840 DOI: 10.1016/j.arr.2023.102164] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 11/23/2023] [Accepted: 12/07/2023] [Indexed: 12/19/2023]
Abstract
The prognostic significance of obesity in sarcopenic adults is controversial. This systematic review and meta-analysis aimed to investigate the effect of additional obesity on health outcomes in sarcopenia. MEDLINE, EMBASE, Scopus and CENTRAL were systematically searched for studies to compare health outcomes of adults with sarcopenic obesity (SO) to those of sarcopenic non-obese (SNO) adults. We also considered the methods of assessing obesity. Of 15060 records screened, 65 papers were included (100612 participants). Older community-dwelling SO adults had 15% lower mortality risk than the SNO group (hazard ratio, HR: 0.85, 95% confidence interval 0.76, 0.94) even when obesity was assessed by measurement of body composition. Additionally, meta-regression analysis revealed a significant negative linear correlation between the age and the HR of all-cause mortality in SO vs. SNO community-dwelling adults, but not in severely ill patients. Compared with SNO, SO patients presented lower physical performance, higher risk for metabolic syndrome, but similar cognitive function, risk of falls and cardiovascular diseases. Age-related obesity, SO and later fat loss leading to SNO represent consecutive phases of biological aging. Additional obesity could worsen the health state in sarcopenia, but above 65 years SO represents a biologically earlier phase with longer life expectancy than SNO.
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Affiliation(s)
- Szimonetta Eitmann
- Institute for Translational Medicine, Medical School, University of Pecs, 12 Szigeti street, H-7624 Pecs, Hungary
| | - Peter Matrai
- Institute for Translational Medicine, Medical School, University of Pecs, 12 Szigeti street, H-7624 Pecs, Hungary
| | - Peter Hegyi
- Institute for Translational Medicine, Medical School, University of Pecs, 12 Szigeti street, H-7624 Pecs, Hungary; Centre for Translational Medicine, Semmelweis University, 26 Ulloi street, H-1085 Budapest, Hungary; Division of Pancreatic Diseases, Semmelweis University, 23-26 Baross street, H-1085 Budapest, Hungary
| | - Marta Balasko
- Institute for Translational Medicine, Medical School, University of Pecs, 12 Szigeti street, H-7624 Pecs, Hungary
| | - Balint Eross
- Institute for Translational Medicine, Medical School, University of Pecs, 12 Szigeti street, H-7624 Pecs, Hungary; Centre for Translational Medicine, Semmelweis University, 26 Ulloi street, H-1085 Budapest, Hungary; Division of Pancreatic Diseases, Semmelweis University, 23-26 Baross street, H-1085 Budapest, Hungary
| | - Kira Dorogi
- Institute for Translational Medicine, Medical School, University of Pecs, 12 Szigeti street, H-7624 Pecs, Hungary
| | - Erika Petervari
- Institute for Translational Medicine, Medical School, University of Pecs, 12 Szigeti street, H-7624 Pecs, Hungary.
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Ruzsics I, Matrai P, Hegyi P, Nemeth D, Tenk J, Csenkey A, Eross B, Varga G, Balasko M, Petervari E, Veres G, Sepp R, Rakonczay Z, Vincze A, Garami A, Rumbus Z. Noninvasive ventilation improves the outcome in patients with pneumonia-associated respiratory failure: systematic review and meta-analysis. J Infect Public Health 2022; 15:349-359. [DOI: 10.1016/j.jiph.2022.02.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 11/29/2021] [Accepted: 02/09/2022] [Indexed: 11/29/2022] Open
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Olah E, Poto L, Hegyi P, Szabo I, Hartmann P, Solymar M, Petervari E, Balasko M, Habon T, Rumbus Z, Tenk J, Rostas I, Weinberg J, Romanovsky AA, Garami A. Therapeutic Whole-Body Hypothermia Reduces Death in Severe Traumatic Brain Injury if the Cooling Index Is Sufficiently High: Meta-Analyses of the Effect of Single Cooling Parameters and Their Integrated Measure. J Neurotrauma 2018; 35:2407-2417. [PMID: 29681213 DOI: 10.1089/neu.2018.5649] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Affiliation(s)
- Emoke Olah
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Laszlo Poto
- Institute of Bioanalysis, Medical School, University of Pecs, Pecs, Hungary
| | - Peter Hegyi
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
- Division of Gastroenterology, First Department of Medicine, Medical School, University of Pecs, Pecs, Hungary
- Momentum Gastroenterology Multidisciplinary Research Group, Hungarian Academy of Sciences - University of Szeged, Szeged, Hungary
| | - Imre Szabo
- Division of Gastroenterology, First Department of Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Petra Hartmann
- Institute of Surgical Research, University of Szeged, Szeged, Hungary
| | - Margit Solymar
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Erika Petervari
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Marta Balasko
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Tamas Habon
- Department of Cardiology and Angiology, First Department of Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Zoltan Rumbus
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Judit Tenk
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Ildiko Rostas
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Jordan Weinberg
- Trauma Research, St. Joseph's Hospital and Medical Center, Phoenix, Arizona
| | | | - Andras Garami
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
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Sarlos P, Szemes K, Hegyi P, Garami A, Szabo I, Illes A, Solymar M, Petervari E, Vincze A, Par G, Bajor J, Czimmer J, Huszar O, Varju P, Farkas N. Steroid but not Biological Therapy Elevates the risk of Venous Thromboembolic Events in Inflammatory Bowel Disease: A Meta-Analysis. J Crohns Colitis 2018; 12:489-498. [PMID: 29220427 DOI: 10.1093/ecco-jcc/jjx162] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Accepted: 11/30/2017] [Indexed: 02/07/2023]
Abstract
BACKGROUND AND AIMS Inflammatory bowel disease [IBD] is associated with a 1.5- to 3-fold increased risk of venous thromboembolism [VTE] events. The aim of this study was to determine the risk of VTE in IBD as a complication of systemic corticosteroids and anti-tumour necrosis factor alpha [TNFα] therapies. METHODS A systematic review and meta-analysis was conducted, which conforms to the Preferred Reporting Items for Systematic Reviews and Meta-analyses [PRISMA] statement. PubMed, EMBASE, Cochrane Library and Web of Science were searched for English-language studies published from inception inclusive of 15 April 2017. The population-intervention-comparison-outcome [PICO] format and statistically the random-effects and fixed-effect models were used to compare VTE risk during steroid and anti-TNFα treatment. Quality of the included studies was assessed using the Newcastle-Ottawa scale. The PROSPERO registration number is 42017070084. RESULTS We identified 817 records, of which eight observational studies, involving 58518 IBD patients, were eligible for quantitative synthesis. In total, 3260 thromboembolic events occurred. Systemic corticosteroids were associated with a significantly higher rate of VTE complication in IBD patients as compared to IBD patients without steroid medication (odds ratio [OR]: 2.202; 95% confidence interval [CI]: 1.698-2.856, p < 0.001). In contrast, treatment with anti-TNFα agents resulted in a 5-fold decreased risk of VTE compared to steroid medication [OR: 0.267; 95% CI: 0.106-0.674, p = 0.005]. CONCLUSION VTE risk should be carefully assessed and considered when deciding between anti-TNFα and steroids in the management of severe flare-ups. Thromboprophylaxis guidelines should be followed, no matter the therapy choice.
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Affiliation(s)
- Patricia Sarlos
- Division of Gastroenterology, First Department of Medicine, University of Pécs, Pécs, Hungary.,Institute for Translational Medicine, University of Pécs, Pécs, Hungary
| | - Kata Szemes
- Division of Gastroenterology, First Department of Medicine, University of Pécs, Pécs, Hungary
| | - Peter Hegyi
- Division of Gastroenterology, First Department of Medicine, University of Pécs, Pécs, Hungary.,Institute for Translational Medicine, University of Pécs, Pécs, Hungary.,Hungarian Academy of Sciences-University of Szeged, Momentum Gastroenterology Multidisciplinary Research Group, Szeged, Hungary
| | - Andras Garami
- Institute for Translational Medicine, University of Pécs, Pécs, Hungary
| | - Imre Szabo
- Division of Gastroenterology, First Department of Medicine, University of Pécs, Pécs, Hungary
| | - Anita Illes
- Division of Gastroenterology, First Department of Medicine, University of Pécs, Pécs, Hungary
| | - Margit Solymar
- Institute for Translational Medicine, University of Pécs, Pécs, Hungary
| | - Erika Petervari
- Institute for Translational Medicine, University of Pécs, Pécs, Hungary
| | - Aron Vincze
- Division of Gastroenterology, First Department of Medicine, University of Pécs, Pécs, Hungary
| | - Gabriella Par
- Division of Gastroenterology, First Department of Medicine, University of Pécs, Pécs, Hungary
| | - Judit Bajor
- Division of Gastroenterology, First Department of Medicine, University of Pécs, Pécs, Hungary
| | - Jozsef Czimmer
- Division of Gastroenterology, First Department of Medicine, University of Pécs, Pécs, Hungary
| | - Orsolya Huszar
- First Department of Surgery, Semmelweis University, Budapest, Hungary
| | - Peter Varju
- Institute for Translational Medicine, University of Pécs, Pécs, Hungary.,Szentágothai Research Centre, University of Pécs, Pécs, Hungary
| | - Nelli Farkas
- Institute for Translational Medicine, University of Pécs, Pécs, Hungary.,Szentágothai Research Centre, University of Pécs, Pécs, Hungary.,Institute of Bioanalysis, University of Pécs, Pécs, Hungary
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Tekus E, Miko A, Furedi N, Rostas I, Tenk J, Kiss T, Szitter I, Balasko M, Helyes Z, Wilhelm M, Petervari E. Body fat of rats of different age groups and nutritional states: assessment by micro-CT and skinfold thickness. J Appl Physiol (1985) 2017; 124:268-275. [PMID: 28729394 DOI: 10.1152/japplphysiol.00884.2016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Obesity presents a growing public health problem. Therefore the analysis of body composition is important in clinical practice as well as in animal research models of obesity; hence precise methods for the assessment of body fat would be essential. We aimed to evaluate in vivo abdominal microcomputed tomography scan restricted to the L1-L3 region [micro-CT(L1-L3)], a skinfold thickness-based method (STM), and postmortem body composition analysis (PMA) with regard to whole body micro-CT scan in rats. Male Wistar rats of different age groups (from 3 to 24 mo) and nutritional states (normally fed, high-fat diet-induced obese, and calorie-restricted) were used. The fat percentage was determined with micro-CT(L1-L3) and whole body scan in anesthetized rats. Their skinfold thickness was measured in five locations with a Lange caliper. Wet weights of epididymal and retroperitoneal fat pads were determined via PMA. With regard to fat mass, the strongest correlation was observed between abdominal and whole body micro-CT. The other methods showed weaker associations with whole body micro-CT and with each other. Micro-CT(L1-L3) and PMA showed similar age-associated increase in fat mass between 3 and 18 mo. Micro-CT(L1-L3), STM, and PMA were efficient to detect differences in fat mass values in groups of different nutritional states. Micro-CT(L1-L3) appears to be a useful method for body fat assessment in rats with reduced scanning time. In rats, STM may also be a useful, low priced, noninvasive, and simple in vivo technique to assess obesity. NEW & NOTEWORTHY Body fat of rats assessed by in vivo abdominal microcomputed tomography of the L1-L3 region strongly correlates with values determined by whole body scan. Therefore, it is a useful method for fat assessment with reduced scanning time. Skinfold thickness measurement is an in vivo technique to assess progression of obesity in rats.
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Affiliation(s)
- Eva Tekus
- Institute of Sport Sciences and Physical Education, University of Pecs , Pecs , Hungary
| | - Alexandra Miko
- Institute for Translational Medicine, University of Pecs , Pecs , Hungary
| | - Nora Furedi
- Institute for Translational Medicine, University of Pecs , Pecs , Hungary
| | - Ildiko Rostas
- Institute for Translational Medicine, University of Pecs , Pecs , Hungary
| | - Judit Tenk
- Institute for Translational Medicine, University of Pecs , Pecs , Hungary
| | - Tamas Kiss
- Department of Pharmacology and Pharmacotherapy, Janos Szentagothai Research Centre and Neuroscience Centre, University of Pecs , Pecs , Hungary
| | - Istvan Szitter
- Department of Pharmacology and Pharmacotherapy, Janos Szentagothai Research Centre and Neuroscience Centre, University of Pecs , Pecs , Hungary
| | - Marta Balasko
- Institute for Translational Medicine, University of Pecs , Pecs , Hungary
| | - Zsuzsanna Helyes
- Department of Pharmacology and Pharmacotherapy, Janos Szentagothai Research Centre and Neuroscience Centre, University of Pecs , Pecs , Hungary.,MTA-PTE NAP-B Chronic Pain Research Group , Hungary
| | - Marta Wilhelm
- Institute of Sport Sciences and Physical Education, University of Pecs , Pecs , Hungary
| | - Erika Petervari
- Institute for Translational Medicine, University of Pecs , Pecs , Hungary
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Rumbus Z, Matics R, Hegyi P, Zsiboras C, Szabo I, Illes A, Petervari E, Balasko M, Marta K, Miko A, Parniczky A, Tenk J, Rostas I, Solymar M, Garami A. Fever Is Associated with Reduced, Hypothermia with Increased Mortality in Septic Patients: A Meta-Analysis of Clinical Trials. PLoS One 2017; 12:e0170152. [PMID: 28081244 PMCID: PMC5230786 DOI: 10.1371/journal.pone.0170152] [Citation(s) in RCA: 75] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Accepted: 12/29/2016] [Indexed: 12/29/2022] Open
Abstract
Background Sepsis is usually accompanied by changes of body temperature (Tb), but whether fever and hypothermia predict mortality equally or differently is not fully clarified. We aimed to find an association between Tb and mortality in septic patients with meta-analysis of clinical trials. Methods We searched the PubMed, EMBASE, and Cochrane Controlled Trials Registry databases (from inception to February 2016). Human studies reporting Tb and mortality of patients with sepsis were included in the analyses. Average Tb with SEM and mortality rate of septic patient groups were extracted by two authors independently. Results Forty-two studies reported Tb and mortality ratios in septic patients (n = 10,834). Pearson correlation analysis revealed weak negative linear correlation (R2 = 0.2794) between Tb and mortality. With forest plot analysis, we found a 22.2% (CI, 19.2–25.5) mortality rate in septic patients with fever (Tb > 38.0°C), which was higher, 31.2% (CI, 25.7–37.3), in normothermic patients, and it was the highest, 47.3% (CI, 38.9–55.7), in hypothermic patients (Tb < 36.0°C). Meta-regression analysis showed strong negative linear correlation between Tb and mortality rate (regression coefficient: -0.4318; P < 0.001). Mean Tb of the patients was higher in the lowest mortality quartile than in the highest: 38.1°C (CI, 37.9–38.4) vs 37.1°C (CI, 36.7–37.4). Conclusions Deep Tb shows negative correlation with the clinical outcome in sepsis. Fever predicts lower, while hypothermia higher mortality rates compared with normal Tb. Septic patients with the lowest (< 25%) chance of mortality have higher Tb than those with the highest chance (> 75%).
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Affiliation(s)
- Zoltan Rumbus
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Robert Matics
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Peter Hegyi
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
- Department of Translational Medicine, First Department of Medicine, University of Pecs, Pecs, Hungary
- Momentum Gastroenterology Multidisciplinary Research Group, Hungarian Academy of Sciences - University of Szeged, Szeged, Hungary
| | - Csaba Zsiboras
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Imre Szabo
- Department of Gastroenterology, First Department of Medicine, University of Pecs, Pecs, Hungary
| | - Anita Illes
- Department of Gastroenterology, First Department of Medicine, University of Pecs, Pecs, Hungary
| | - Erika Petervari
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Marta Balasko
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Katalin Marta
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
- Department of Translational Medicine, First Department of Medicine, University of Pecs, Pecs, Hungary
| | - Alexandra Miko
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Andrea Parniczky
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
- Department of Gastroenterology, First Department of Medicine, University of Pecs, Pecs, Hungary
| | - Judit Tenk
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Ildiko Rostas
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Margit Solymar
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Andras Garami
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
- * E-mail:
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Petervari E, Garami A, Pakai E, Szekely M. Effects of perineural capsaicin treatment of the abdominal vagus on endotoxin fever and on a non-febrile thermoregulatory event. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/09680519050110050201] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Following perineural capsaicin pretreatment of the main trunks of the abdominal vagus of rats, the first and the second phases of the polyphasic febrile response to intravenous lipopolysaccharide were unaltered, while the third phase of fever course (peak at 5 h) was attenuated. In rats desensitized by intraperitoneal (i.p.) capsaicin (i.e. abdominal non-systemic desensitization), mainly the first but not the later fever phases were reduced. The postprandial hyperthermia to intragastric injection of BaSO4 suspension was attenuated by either i.p. or perineural capsaicin treatment. It is concluded that, in contrast to the accepted model of postprandial hyperthermia, which is mediated by capsaicin-sensitive fibers of the abdominal vagus, in the early phase of polyphasic fever the vagal afferent nerves appear to play no role. The influence of i.p. capsaicin-desensitization on this initiating fever phase is independent of the vagus, and a capsaicin-induced alteration of endotoxin action in the liver, prior to vagal nerve endings, is more likely. The late febrile phase is probably influenced by efferent vagal fibers, which might be damaged more easily by perineural than i.p. capsaicin treatment.
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Affiliation(s)
- Erika Petervari
- Department of Pathophysiology, Faculty of Medicine, University of Pécs, Hungary
| | - Andras Garami
- Department of Pathophysiology, Faculty of Medicine, University of Pécs, Hungary
| | - Eszter Pakai
- Department of Pathophysiology, Faculty of Medicine, University of Pécs, Hungary
| | - Miklos Szekely
- Department of Pathophysiology, Faculty of Medicine, University of Pécs, Hungary,
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Balasko M, Tenk J, Polotzek SBF, Jech-Mihalffy A, Soos S, Szekely M, Petervari E. Age-related disparate shifts in the central anorexic and hypermetabolic effects of corticotropin releasing factor (Crf). Exp Gerontol 2013. [DOI: 10.1016/j.exger.2013.05.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Petervari E, Furedi N, Miko A, Heppeler GAI, Gaspar-Koncsecsko M, Soós S, Szekely M, Balasko M. Age-related disparate shifts in the anorexic and hyperthermic effects of cholecystokinin (Cck): The influence of body composition. Exp Gerontol 2013. [DOI: 10.1016/j.exger.2013.05.039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Soos S, Petervari E, Szekely M, Jech-Mihalffy A, Balasko M. Complex catabolic effects of central alpha-MSH infusion in rats of altered nutritional states: differences from leptin. J Mol Neurosci 2010; 43:209-16. [PMID: 20953734 DOI: 10.1007/s12031-010-9462-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2010] [Accepted: 10/05/2010] [Indexed: 01/15/2023]
Abstract
The hypothalamic melanocortin (MC) system is a major catabolic regulator of energy balance: it suppresses food intake (FI), elevates metabolic rate, and reduces body weight (BW). The primary activator of the MC system [mainly via the alpha-melanocyte stimulating hormone (alpha-MSH)] is the adipocyte-derived leptin. With increasing BW, resistance develops to leptin-induced anorexia, but independent of this, in genetically modified animals, some alpha-MSH actions were maintained. We investigated the responsiveness of the MC system in its complexity (FI vs. metabolic correlates) in genetically intact male Wistar rats of different nutritional states (and different leptin sensitivities), i.e., in rats aged 2 months [normally fed (NF2)] or 6 months [calorie-restricted (CR6), fed ad libitum (NF6), and high-fat diet-induced obese (HF6) groups]. A 7-day-long, 1-μg/μl/h intracerebroventricular infusion of alpha-MSH reduced BW in all groups, particularly in NF6 and NF2 animals, and even CR6 rats lost BW upon alpha-MSH infusion (in contrast to leptin administration). Anorexia developed in NF2-NF6 and less in CR6 groups, and some FI fall was also seen in HF6 rats. The hypermetabolic effects (temperature/heart rate elevations) were most pronounced in CR6 and next in HF6 rats. These data suggest that alpha-MSH responsiveness is maintained in various forms (depending on nutritional state), despite obesity-induced leptin resistance.
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Affiliation(s)
- Szilvia Soos
- Department of Pathophysiology and Gerontology, Medical School, University of Pecs, 12 Szigeti ut, Pecs H-7624, Hungary
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Abstract
Energy balance of the body is determined mainly by the function of various hypothalamic and brainstem nuclei, according to a complex interaction between the regulation of body temperature (actual metabolic rate vs. heat loss) and regulation of body weight (metabolic rate vs. food intake). The direct effect of central anabolic neuropeptides (neuropeptide Y, orexins, melanin concentrating hormone, etc.) is to enhance food intake and suppress metabolic rate with a tendency to cause hypothermia, while central catabolic neuropeptides (melanocortins, corticotropin releasing factor, cocaine-amphetamine regulated peptide, etc.) suppress food intake and enhance energy expenditure with a tendency to induce hyperthermia. Many other neuropeptides are neither clearly anabolic, nor clearly catabolic, but still influence these complex hypothalamic/brainstem functions. Some peripheral peptides (e.g. leptin, insulin, ghrelin) acting at either peripheral or cerebral sites also contribute to the regulation of energy balance. The prevailing thermoregulatory status, the substances or neural signals representing actual feeding vs. established nutritional states, and the aging process may modify the expression and/or activity of peripheral and central peptides and peptide receptors.
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Affiliation(s)
- Miklos Szekely
- Department of Pathophysiology and Gerontology, Medical School, University of Pecs, Hungary.
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Szekely M, Petervari E, Szelenyi Z. Orexigenic vs. anorexigenic peptides and feeding status in the modulation of fever and hypothermia. FRONT BIOSCI-LANDMRK 2004; 9:2746-63. [PMID: 15353311 DOI: 10.2741/1433] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Prevailing changes in the feeding status or the nutritional status, in general, can modify the expression of many orexigenic and anorexigenic peptides, which influence hypothalamic functions. These peptides usually adjust body temperature according to anabolic (increased appetite with suppressed metabolic rate and body temperature) or catabolic (anorexia with enhanced metabolism and temperature) patterns. It was plausible to presume that such peptides contribute to regulated changes of body temperature (either fever or hypothermia) in systemic inflammation, particularly since anorexia is a common feature in inflammatory processes. No consistent, common, or uniform way of action was, however, demonstrated, which could have described the effects of various peptides. With the exception of cholecystokinin (CCK), all investigated peptides were devoid of real thermoregulatory actions: they influenced the metabolic rate (and consequently body temperature), but not the mechanisms of heat loss. Central CCK is indeed catabolic and may participate in febrigenesis. Leptin may activate various cytokines, catabolic peptides and may inhibit anabolic peptides, but it probably has no direct febrigenic effect and it is not indispensable in fever. Melanocortins and corticotropin-releasing factor provide catabolic adaptive mechanisms to food intake (diet induced thermogenesis) and environmental stress, respectively, but they act rather as endogenous antipyretic substances during systemic inflammation, possibly contributing to the mechanisms of limitation of fever. Bacterial lipopolysaccharides enhance the expression of most of these catabolic peptides. In contrast, neuropeptide Y (NPY) expression may not be changed, only its release is decreased at specific nuclei, a defective NPY effect may also contribute to the febrile rise in body temperature. The data provide no clear-cut explanation for the mechanism of hypothermia seen in systemic inflammation. According to speculations, a presumed, overflow,-type release of NPY from the hypothalamic nuclei, as well as a suppression of the activity of catabolic peptides, could possibly cause hypothermia. There are no cues, however, referring to the identity of factors that could trigger such changes during systemic inflammation in order to induce hypothermia.
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Affiliation(s)
- Miklos Szekely
- Department of Pathophysiology, Faculty of Medicine, University of Pécs, Hungary.
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