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Experimental Hyperleptinemia Acutely Increases Vasoconstrictory Sympathetic Nerve Activity in Healthy Humans.
MedLine Citation:
PMID:  23393176     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Background:Obesity and arterial hypertension are tightly connected. Obese individuals show significant elevation of vasoconstrictory muscle sympathetic nerve activity (MSNA). Obesity-related hyperleptinemia might play a key role in mediating these effects. Leptin is synthesized in proportion to body fat mass and activates SNA in animal models. In humans, however, direct evidence linking hyperleptinemia to sympathetic activation has not yet been established. In the present study, we characterize the effects of acute hyperleptinemia on microneurographically recorded SNA in humans.Methods:In a balanced, double-blind crossover design, 12 healthy normal-weight males received an iv bolus of leptin or placebo. MSNA (bursts per minute) was continuously recorded using a microneurographic technique. Ten-minute periods were analyzed at resting periods before (t(-100)) and at 20 (t(20)), 60 (t(60)), and 140 (t(140)) minutes after substance administration. Blood pressure and heart rate (HR) were recorded simultaneously.Results:Baseline values of MSNA, blood pressure, and HR were comparable in both conditions (MSNA: t(-100), 24.3 ± 1.6 vs 22.7 ± 1.7, not significant). After application of leptin, MSNA showed a significant increase (t(20), 31.0 ± 1.9 vs. 24.9 ± 1.8, P = .05) that persisted until the end of the experiment (t(60), P = .008; t(140), P = .004). There were no significant changes in blood pressure and HR.Conclusions:Acute experimental hyperleptinemia has significant central nervous excitatory effects on vasoconstrictory sympathetic outflow as measured by MSNA in healthy men. These results suggest that leptin acts as an important mediator linking obesity to elevated MSNA and potentially to the development of hypertension.
Authors:
Felix Machleidt; Paul Simon; Alexander F Krapalis; Manfred Hallschmid; Hendrik Lehnert; Friedhelm Sayk
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-2-7
Journal Detail:
Title:  The Journal of clinical endocrinology and metabolism     Volume:  -     ISSN:  1945-7197     ISO Abbreviation:  J. Clin. Endocrinol. Metab.     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-2-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375362     Medline TA:  J Clin Endocrinol Metab     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Internal Medicine I (F.M., P.S., A.F.K., H.L., F.S.), University Hospital of Schleswig-Holstein, Campus Lübeck, D-23538 Lübeck, Germany; and Department of Medical Psychology and Behavioral Neurobiology (M.H.) , University of Tübingen, D-72076 Tübingen, Germany.
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