Cited by 33Metabolism, Diabetes, and CancerSirtuins and Resveratrol in MedicineAdipose Tissue and Metabolism

GLP‑1 improves palmitate‑induced insulin resistance in human skeletal muscle via SIRT1 activity

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Jeon, Ja, Choi, Sung‑E, Ha, Eun, Lee, Han, Kim, Tae, Han, Seung, Kim, Hae, Kim, Dae +2 more·2019·International Journal of Molecular Medicine

Abstract

The present study investigated whether glucagon like peptide‑1 (GLP‑1) improves glucose uptake through glucose transporter type 4 (GLUT4), mediated by the activation of sirtuin 1 (SIRT1), in skeletal muscle cells with palmitate induced‑insulin resistance. The levels of glucose uptake, GLUT4, protein kinase A (PKA), and cyclic adenosine monophosphate (cAMP) were determined in human skeletal muscle myotubes (HSMMs) exposed to palmitate and GLP‑1. Then, to determine whether PKA/cAMP were downstream signals of GLP‑1, a PKA inhibitor was used. To determine whether SIRT‑1 contributes to GLP‑1 action in HSMMs with palmitate‑induced insulin resistance, the levels of peroxisome proliferator‑activated receptor γ coactivator 1α (PGC1α) deacetylation and SIRT‑1 activity were assessed using a SIRT1 inhibitor and small interfering RNA (siRNA). The phosphorylation levels of protein kinase B (Akt) and insulin receptor substrate 1 (IRS‑1) as insulin signaling pathways, were assessed in GLP‑1‑treated HSMMs exposed to palmitate. The influence of SIRT1 on the GLP‑1‑induced activation of insulin signaling pathway was determined using a SIRT1 inhibitor. GLP‑1 restored the palmitate‑induced reductions in the levels of glucose uptake, GLUT4 mRNA, GLUT4 promoter activity, and GLUT4 protein in HSMMs. PKA and cAMP, as GLP‑1 downstream signals, played a role in this process. GLP‑1 increased the deacetylation levels of PGC1α, and stimulated SIRT1 in HSMMs. Moreover, the SIRT1 inhibitor and siRNA of SIRT1 suppressed the effect of GLP‑1 on GLUT4 expression in HSMMs exposed to palmitate. The SIRT1 inhibitor also prevented the GLP‑1‑induced phosphorylation of IRS‑1 and Akt in palmitate‑treated HSMMs. The present findings suggest that in palmitate‑induced insulin‑resistant HSMM, GLP‑1 activates SIRT1 through the PKA/cAMP pathway, which in turn enhances glucose uptake through GLUT4 and the insulin signaling pathway.

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Authors
Jeon, J., Choi, S., Ha, E., Lee, H., Kim, T., Han, S., Kim, H., Kim, D., Kang, Y., & Lee, K.
Affiliations
  • Ajou University (KR)
  • Seoul Medical Center (KR)
Venue
International Journal of Molecular Medicine
Published
2019-07-09
Volume
44
Issue
3
Pages
1161-1171
ISSN
  • 1107-3756 (ISSN-L)
  • 1791-244X
OpenAlex
W2962539552
Cited by
33
References
53
Citations by year
2026: 1 · 2025: 6 · 2024: 7 · 2023: 9 · 2022: 3 · 2021: 3 · 2020: 3 · 2019: 1
FWCI
0.83
Type
journal article
Language
en
Open access
Locations
  • International Journal of Molecular Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • AJOU Open Repository (Ajou University) (submittedVersion)
Funders
  • National Research Foundation
  • Ajou University
  • National Research Foundation of Korea (NRF-2016)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Geriatrics and Gerontology › Sirtuins and Resveratrol in Medicine
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
Keywords
glucagon-like peptide-1, insulin resistance, palmitate, skeletal muscle, SIRT1, GLUT4, glucose uptake, protein kinase A, cAMP signaling, insulin signaling, Akt, IRS-1
MeSH terms
Acetylation, Enzyme Activation, Humans, Insulin Resistance, Models, Biological, Phosphorylation, Recombinant Proteins, Signal Transduction, Muscle, Skeletal, Palmitic Acid, Glucose Transporter Type 4, Glucagon-Like Peptide 1, Sirtuin 1

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