Cited by 572Immune Response and InflammationAdipokines, Inflammation, and Metabolic DiseasesAdvanced Glycation End Products research

Increased Toll-Like Receptor (TLR) Activation and TLR Ligands in Recently Diagnosed Type 2 Diabetic Subjects

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Dasu, Mohan R., Devaraj, Sridevi, Park, Samuel, Jialal, Ishwarlal·2010·Diabetes Care

Abstract

OBJECTIVE: Individuals with type 2 diabetes have a myriad of metabolic aberrations including increased inflammation, increasing their cardiovascular risk. Toll-like receptors (TLRs) and their ligands play a key role in insulin resistance and atherosclerosis. However, there is a paucity of data examining the expression and activity of TLRs in type 2 diabetes. Thus, in the present study, we examined TLR2 and TLR4 mRNA and protein expression, their ligands, and signaling in monocytes of recently diagnosed type 2 diabetic patients. RESEARCH DESIGN AND METHODS: TLR mRNA, protein expression, TLR ligands, and TLR signaling were measured in freshly isolated monocytes from healthy human control subjects (n = 23) and type 2 diabetic subjects (n = 23) using real-time RT-PCR, Western blot, and flow cytometric assays. RESULTS: Type 2 diabetic subjects had significantly increased TLR2, TLR4 mRNA, and protein in monocytes compared with control subjects (P < 0.05). Increased TLR2 and TLR4 expression correlated with BMI, homeostasis model assessment–insulin resistance (HOMA-IR), glucose, A1C, Nε-(carboxymethyl) lysine (CML), and free fatty acid (FFA). Ligands of TLR2 and TLR4, namely, HSP60, HSP70, HMGB1, endotoxin, and hyaluronan levels, were elevated in type 2 diabetic subjects and positively correlated with TLR2 and TLR4. Type 2 diabetic subjects showed increased MyD88, phosphorylated IRAK-1, Trif, TICAM-1, IRF-3, and NF-κB p65 expression in monocytes compared with control subjects. Furthermore, TLR-MyD88-NF-κB signaling resulted in elevated levels of cytokines (P < 0.05), but increased interleukin (IL)-1β, interferon (IFN)-γ, and endotoxin were not significant when adjusted for BMI. CONCLUSIONS: In this comprehensive study, we make the novel observation that TLR2 and TLR4 expression and their ligands, signaling, and functional activation are increased in recently diagnosed type 2 diabetes and contribute to the proinflammatory state.

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  • Serum hyaluronan is increased in T2DM.

    “serum hyaluronan is increased in T2DM.”

    From The Vasculature in Prediabetes (2018) · cites this paper as [175]

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Authors
Dasu, M. R., Devaraj, S., Park, S., & Jialal, I.
Affiliations
  • University of California Davis Medical Center (US)
  • VA Northern California Health Care System (US)
Corresponding author
Dasu, Mohan R.
Venue
Diabetes Care
Published
2010-01-12
Volume
33
Issue
4
Pages
861-868
ISSN
  • 0149-5992 (ISSN-L)
  • 1935-5548
OpenAlex
W2155734075
Cited by
572
References
27
Citations by year
2026: 12 · 2025: 19 · 2024: 34 · 2023: 35 · 2022: 31 · 2021: 36 · 2020: 49 · 2019: 42 · 2018: 42 · 2017: 35 · 2016: 49 · 2015: 49 · 2014: 43 · 2013: 33 · 2012: 33
FWCI
12.90
Type
journal article
Language
en
Open access
Locations
  • Diabetes Care (publishedVersion, cc-by-nc-nd)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
Funders
  • American Diabetes Association
  • National Institutes of Health
  • National Center for Research Resources (UL1RR024146)
  • National Center for Complementary and Integrative Health (K-24AT00596, K24AT000596)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Clinical Biochemistry › Advanced Glycation End Products research
Keywords
type 2 diabetes, Toll-like receptors, TLR2, TLR4, monocytes, TLR ligands, MyD88 signaling, NF-κB signaling, inflammation, insulin resistance, HSP60, HSP70, HMGB1, endotoxin, hyaluronic acid, cytokines, newly diagnosed diabetes
MeSH terms
Diabetes Mellitus, Type 2, Enzyme-Linked Immunosorbent Assay, Humans, Hyaluronic Acid, Interferon-gamma, Monocytes, Blotting, Western, Case-Control Studies, Chaperonin 60, Reverse Transcriptase Polymerase Chain Reaction, HMGB1 Protein, Adaptor Proteins, Vesicular Transport, Immunoprecipitation, Interferon Regulatory Factor-3, HSP72 Heat-Shock Proteins, Toll-Like Receptors, Toll-Like Receptor 2, Toll-Like Receptor 4, Transcription Factor RelA, Interleukin-1beta, Interleukin-1 Receptor-Associated Kinases, Myeloid Differentiation Factor 88

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