Pharmacological Vasodilation Improves Insulin-Stimulated Muscle Protein Anabolism but Not Glucose Utilization in Older Adults
Open accessAbstract
OBJECTIVE: Skeletal muscle protein metabolism is resistant to the anabolic action of insulin in healthy, nondiabetic older adults. This defect is associated with impaired insulin-induced vasodilation and mTORC1 signaling. We hypothesized that, in older subjects, pharmacological restoration of insulin-induced capillary recruitment would improve the response of muscle protein synthesis and anabolism to insulin. RESEARCH DESIGN AND METHODS: Twelve healthy, nondiabetic older subjects (71 ± 2 years) were randomized to two groups. Subjects were studied at baseline and during local infusion in one leg of insulin alone (Control) or insulin plus sodium nitroprusside (SNP) at variable rate to double leg blood flow. We measured leg blood flow by dye dilution; muscle microvascular perfusion with contrast enhanced ultrasound; Akt/mTORC1 signaling by Western blotting; and muscle protein synthesis, amino acid, and glucose kinetics using stable isotope methodologies. RESULTS: There were no baseline differences between groups. Blood flow, muscle perfusion, phenylalanine delivery to the leg, and intracellular availability of phenylalanine increased significantly (P < 0.05) in SNP only. Akt phosphorylation increased in both groups but increased more in SNP (P < 0.05). Muscle protein synthesis and net balance (nmol · min−1 · 100 ml · leg−1) increased significantly (P < 0.05) in SNP (synthesis, 43 ± 6 to 129 ± 25; net balance, −16 ± 3 to 26 ± 12) but not in Control (synthesis, 41 ± 10 to 53 ± 8; net balance, −17 ± 3 to −2 ± 3). CONCLUSIONS: Pharmacological enhancement of muscle perfusion and amino acid availability during hyperinsulinemia improves the muscle protein anabolic effect of insulin in older adults.
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Inflammation is associated with anabolic resistance in muscle, caused partly by inhibition of perfusion adjustment to anabolic stimuli and partly by inhibition of IGF1 production and signalling.
“inflammation is associated with anabolic resistance in muscle, which is caused partly by inhibition of the perfusion adjustment to anabolic stimuli and partly by inhibition of IGF1 production and signalling”
From Inflammageing: chronic inflammation in ageing, cardiovascular disease, and frailty (2018) · cites this paper as [238]
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- Authors
- Timmerman, K. L., Lee, J. L., Fujita, S., Dhanani, S., Dreyer, H. C., Fry, C. S., Drummond, M. J., Sheffield-Moore, M., Rasmussen, B. B., & Volpi, E.
- Affiliations
- The University of Texas Medical Branch at Galveston (US)
- Sealy Center on Aging, University of Texas Medical Branch, Galveston, Texas;
- Corresponding author
- Volpi, Elena
- ORCID
- Venue
- Diabetes
- Publisher
- American Diabetes Association
- Published
- 2010-08-19
- Volume
- 59
- Issue
- 11
- Pages
- 2764-2771
- ISSN
- 0012-1797 (ISSN-L)
- 1939-327X
- PMC
- PMC2963534
- OpenAlex
- W2109053852
- Cited by
- 149
- References
- 50
- Citations by year
- 2026: 4 · 2025: 6 · 2024: 10 · 2023: 12 · 2022: 4 · 2021: 9 · 2020: 11 · 2019: 3 · 2018: 12 · 2017: 6 · 2016: 16 · 2015: 15 · 2014: 9 · 2013: 11 · 2012: 9
- FWCI
- 4.47
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Diabetes (publishedVersion, cc-by-nc-nd)
- PubMed Central (publishedVersion, cc-by-nc-nd)
- PubMed (publishedVersion)
- Funders
- Lantheus Medical Imaging
- National Institutes of Health (RR-00073)
- National Institute on Aging (R01AG018311, R01 AG18311, P30AG024832)
- National Center for Research Resources (M01 RR-00073, S10RR016650, S10-RR-16650, UL1RR029876, M01RR000073)
- Eunice Kennedy Shriver National Institute of Child Health and Human Development (T32-HD-07539, K12HD055929, T32HD007539)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
- Health Sciences › Medicine › Physiology › Nutrition and Health in Aging
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
- Keywords
- insulin resistance, muscle protein synthesis, muscle protein anabolism, insulin-induced vasodilation, sodium nitroprusside, older adults, mTORC1 signaling, Akt phosphorylation, muscle blood flow, amino acid availability, glucose utilization, hyperinsulinemic-euglycemic clamp, skeletal muscle
- MeSH terms
- Aged, Blood Flow Velocity, Blood Glucose, Female, Humans, Indocyanine Green, Insulin, Leg, Male, Microcirculation, Nitroprusside, Phenylalanine, Ultrasonography, Vasodilation, Body Mass Index, Muscle, Skeletal, Proto-Oncogene Proteins c-akt
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