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Diabetologia

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01.01.2016 | Meta-Analysis

Role of insulin in the regulation of human skeletal muscle protein synthesis and breakdown: a systematic review and meta-analysis

verfasst von: Haitham Abdulla, Kenneth Smith, Philip J. Atherton, Iskandar Idris

Erschienen in: Diabetologia | Ausgabe 1/2016

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Abstract

Aims/hypothesis

We aimed to investigate the role of insulin in regulating human skeletal muscle metabolism in health and diabetes.

Methods

We conducted a systematic review and meta-analysis of published data that examined changes in skeletal muscle protein synthesis (MPS) and/or muscle protein breakdown (MPB) in response to insulin infusion. Random-effects models were used to calculate weighted mean differences (WMDs), 95% CIs and corresponding p values. Both MPS and MPB are reported in units of nmol (100 ml leg vol.)⁻¹ min⁻¹.

Results

A total of 104 articles were examined in detail. Of these, 44 and 25 studies (including a total of 173 individuals) were included in the systematic review and meta-analysis, respectively. In the overall estimate, insulin did not affect MPS (WMD 3.90 [95% CI −0.74, 8.55], p = 0.71), but significantly reduced MPB (WMD −15.46 [95% CI −19.74, −11.18], p < 0.001). Overall, insulin significantly increased net balance protein acquisition (WMD 20.09 [95% CI 15.93, 24.26], p < 0.001). Subgroup analysis of the effect of insulin on MPS according to amino acid (AA) delivery was performed using meta-regression analysis. The estimate size (WMD) was significantly different between subgroups based on AA availability (p = 0.001). An increase in MPS was observed when AA availability increased (WMD 13.44 [95% CI 4.07, 22.81], p < 0.01), but not when AA availability was reduced or unchanged. In individuals with diabetes and in the presence of maintained delivery of AA, there was a significant reduction in MPS in response to insulin (WMD −6.67 [95% CI −12.29, −0.66], p < 0.05).

Conclusions/interpretation

This study demonstrates the complex role of insulin in regulating skeletal muscle metabolism. Insulin appears to have a permissive role in MPS in the presence of elevated AAs, and plays a clear role in reducing MPB independent of AA availability.

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Titel: Role of insulin in the regulation of human skeletal muscle protein synthesis and breakdown: a systematic review and meta-analysis
verfasst von: Haitham Abdulla
Kenneth Smith
Philip J. Atherton
Iskandar Idris
Publikationsdatum: 01.01.2016
Verlag: Springer Berlin Heidelberg
Erschienen in: Diabetologia / Ausgabe 1/2016
Print ISSN: 0012-186X
Elektronische ISSN: 1432-0428
DOI: https://doi.org/10.1007/s00125-015-3751-0

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Role of insulin in the regulation of human skeletal muscle protein synthesis and breakdown: a systematic review and meta-analysis

Abstract

Aims/hypothesis

Methods

Results

Conclusions/interpretation

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Methods

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