Cited by 500Metabolism, Diabetes, and CancerDiabetes, Cardiovascular Risks, and LipoproteinsAdipokines, Inflammation, and Metabolic Diseases

The DOI matches its Crossref record; 33 of the 33 references it cites were found in a registry or an index.

PKC-θ knockout mice are protected from fat-induced insulin resistance

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Abstract

Insulin resistance plays a primary role in the development of type 2 diabetes and may be related to alterations in fat metabolism. Recent studies have suggested that local accumulation of fat metabolites inside skeletal muscle may activate a serine kinase cascade involving protein kinase C–θ (PKC-θ), leading to defects in insulin signaling and glucose transport in skeletal muscle. To test this hypothesis, we examined whether mice with inactivation of PKC-θ are protected from fat-induced insulin resistance in skeletal muscle. Skeletal muscle and hepatic insulin action as assessed during hyperinsulinemic-euglycemic clamps did not differ between WT and PKC-θ KO mice following saline infusion. A 5-hour lipid infusion decreased insulin-stimulated skeletal muscle glucose uptake in the WT mice that was associated with 40–50% decreases in insulin-stimulated tyrosine phosphorylation of insulin receptor substrate–1 (IRS-1) and IRS-1–associated PI3K activity. In contrast, PKC-θ inactivation prevented fat-induced defects in insulin signaling and glucose transport in skeletal muscle. In conclusion, our findings demonstrate that PKC-θ is a crucial component mediating fat-induced insulin resistance in skeletal muscle and suggest that PKC-θ is a potential therapeutic target for the treatment of type 2 diabetes.

Overview

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Crossref · 10.1172/jci200422230

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33 of 33 references verified0 citation errors · 0 not checkable

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  1. Shaw, 2000, Diabetes Care., 23(Suppl. 2), B5

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Metadata

Authors
Kim, J. K., Fillmore, J. J., Sunshine, M. J., Albrecht, B., Higashimori, T., Kim, D.-W., Liu, Z.-X., Soos, T. J., Cline, G. W., O’Brien, W. R., Littman, D. R., & Shulman, G. I.
Affiliations
  • Yale University (US)
  • Howard Hughes Medical Institute (US)
Corresponding author
Kim, Jason K.
Venue
Journal of Clinical Investigation
Published
2004-09-15
Volume
114
Issue
6
Pages
823-827
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2119595824
Cited by
500
References
31
Citations by year
2026: 6 · 2025: 6 · 2024: 8 · 2023: 5 · 2022: 13 · 2021: 13 · 2020: 14 · 2019: 18 · 2018: 18 · 2017: 17 · 2016: 16 · 2015: 22 · 2014: 21 · 2013: 35 · 2012: 35
FWCI
11.49
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • YUHSpace (Yonsei University Medical Library) (submittedVersion, cc-by-nc-nd)
Funders
  • Howard Hughes Medical Institute
  • American Diabetes Association
  • Yale University
  • U.S. Public Health Service (P30 DK45735, R01 DK-40936)
  • National Institute of Diabetes and Digestive and Kidney Diseases (P30DK45735, R01-DK40936, U24DK59635, R01DK080756, R01DK040936, U24DK059635, P30DK045735)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adipokines, Inflammation, and Metabolic Diseases
Keywords
protein kinase C theta, skeletal muscle insulin signaling, type 2 diabetes, lipid infusion, insulin-stimulated glucose uptake, IRS-1 tyrosine phosphorylation, hyperinsulinemic-euglycemic clamp, hepatic insulin action, therapeutic target
MeSH terms
Protein Kinase C-theta, Adipose Tissue, Animals, Blood Glucose, Diabetes Mellitus, Type 2, Fatty Acids, Nonesterified, Infusions, Intravenous, Insulin, Insulin Resistance, Isoenzymes, Lipids, Phosphoproteins, Phosphorylation, Protein Kinase C, Signal Transduction, Mice, Knockout, Muscle, Skeletal, Mice, Insulin Receptor Substrate Proteins

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