Abstract
The insulin signaling pathway regulates whole-body glucose homeostasis by transducing extracellular signals from the insulin receptor (IR) to downstream intracellular targets, thus coordinating a multitude of biological functions. Dysregulation of IR or its signal transduction is associated with insulin resistance, which may culminate in type 2 diabetes. Following initial stimulation of IR, insulin signaling diverges into different pathways, activating multiple substrates that have roles in various metabolic and cellular processes. The integration of multiple pathways arising from IR activation continues to expand as new IR substrates are identified and characterized. Accordingly, our review will focus on roles for IR substrates as they pertain to three primary areas: metabolism/glucose uptake, mitogenesis/growth, and aging/longevity. While IR functions in a seemingly pleiotropic manner in many cell types, through these three main roles in fat and skeletal muscle cells, IR multi-tasks to regulate whole-body glucose homeostasis to impact healthspan and lifespan.
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Abbreviations
- Akt:
-
Protein kinase B
- aP2:
-
Adipocyte protein 2
- APS:
-
Adapter protein with pleckstrin homology and Src homology domain
- Arp2/3:
-
Actin-related protein 2/3
- AS160:
-
Akt substrate of 160 kDa
- BAIRKO:
-
Brown adipocyte-specific insulin receptor knockout
- CAP:
-
c-Cbl-associated protein
- Cav-1:
-
Caveolin-1
- Cav-3:
-
Caveolin-3
- CHO:
-
Chinese hamster ovary cells
- CIP4:
-
Cdc42-interacting protein
- CrkII:
-
CT10-related kinase
- Erk1/2:
-
Extracellular signal regulated kinases 1 or 2
- FIRKO:
-
Fat-specific muscle insulin receptor knockout
- FOXO:
-
Forkhead box protein O-1
- Gab-1:
-
Grb2-associated binding protein
- GIRKI:
-
GLUT4-expressing tissues insulin receptor knock-in mouse
- GIRKO:
-
GLUT4-expressing tissues insulin receptor knockout
- GLUT4:
-
Glucose transporter 4
- Grb2:
-
Growth factor receptor bound 2
- Grb10:
-
Growth factor receptor bound 10
- HR:
-
Hybrid receptor
- IGF:
-
Insulin-like growth factor
- IGFR:
-
Insulin-like growth factor receptor
- IR:
-
Insulin receptor
- IRS-1/2:
-
Insulin receptor substrate-1 or 2
- Jak-1:
-
Janus kinase-1
- L1:
-
Ligand binding domain 1
- L2:
-
Ligand binding domain 2
- LAR:
-
Leukocyte antigen related
- LRP:
-
Lipoprotein receptor-related protein
- MAPK:
-
Mitogen-activated protein kinase
- MIRKO:
-
Muscle-specific muscle insulin receptor knockout
- MD1/2:
-
Mytonic dystrophy
- mTOR:
-
Mammalian target of rapamycin
- N-Wasp:
-
Neuronal Wiskott–Aldrich syndrome protein
- PC-1:
-
Plasma cell membrane glycoprotein-1
- PDK-1:
-
Phosphoinsitide-dependent protein kinase 1
- PH:
-
Pleckstrin homology
- PI3-K:
-
Phosphoinositide 3-kinase
- PIP3:
-
Phosphatidylinositol (3, 4, 5)-triphosphate
- PKC:
-
Protein kinase C
- PM:
-
Plasma membrane
- PP63:
-
Phosphoprotein of 63 kDa
- PTB:
-
Phosphotyrosine binding domain
- PTP1B:
-
Protein tyrosine phosphatase 1B
- p21Ras :
-
Rat sarcoma protein (Ras)
- SAIN:
-
Shc and IRS NPXY binding domain
- SERCA:
-
Sarcoplasmic/endoplasmic reticulum calcium ATPase
- SH2:
-
Src homology 2
- Shc:
-
Src homology-containing protein
- SHP:
-
SH2-containing tyrosine phosphatase
- SirT:
-
Sirtuins
- SNARE:
-
Soluble N-ethylmaleimide-sensitive factor attachment receptor
- SOCS-3:
-
Suppressor of cytokine signaling 3
- SOS:
-
Son of Sevenless
- STAT:
-
Signal transducer and activator of transcription
- T2D:
-
Type 2 diabetes
- t-SNARE:
-
Target membrane SNARE protein
- Tyk-2:
-
Tyrosine kinase-2
- VAMP2:
-
Vesicle-associated membrane SNARE protein-2
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Acknowledgments
We would first like to express our regret to whose work was not cited due to lack of space. We would like to Dr. Stephanie Yoder and Dr. Michael Kalwat for the critical reading of the manuscript. This study was supported by grants from the National Institutes of Health (DK067912 and DK076614 to D.C.T.), the Indiana University School of Medicine Showalter Foundation (to E.O.), and a pre-doctoral fellowship from the American Heart Association (to L.R.).
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Ramalingam, L., Oh, E. & Thurmond, D.C. Novel roles for insulin receptor (IR) in adipocytes and skeletal muscle cells via new and unexpected substrates. Cell. Mol. Life Sci. 70, 2815–2834 (2013). https://doi.org/10.1007/s00018-012-1176-1
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DOI: https://doi.org/10.1007/s00018-012-1176-1