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Published on: May 6, 2013
Preliminary analysis of immune activation in early onset type 2 diabetes
Julia D Rempel1, Juliet Packiasamy, Heather J Dean
1OOH-QUIN Immunology Laboratory, Section of Hepatology, Department of Internal Medicine, Manitoba Institute of Child Health, Winnipeg, Canada. julia.rempel@med.umanitoba.ca
Insights
Immune cells from youth with type 2 diabetes (T2D) show heightened responses to certain stimuli, particularly increased interleukin-1β (IL-1β) production. This suggests exaggerated cellular immunity may contribute to early-onset T2D in Indigenous children.
Area of Science:
- Immunology and metabolic disease research.
- Investigating cellular immune responses in early-onset type 2 diabetes (T2D).
- Focus on toll-like receptor 4 (TLR4) activation pathways.
Background:
- First Nations and Aboriginal children face disproportionately high rates of cardiometabolic diseases, including T2D.
- Pro-inflammatory immune responses, involving toll-like receptors (TLR) and cytokines like TNF-α and IL-1β, can disrupt insulin signaling.
- TLR4 activation by lipids from bacteria and food can prime immune cells, potentially contributing to T2D pathogenesis.
Purpose of the Study:
- To investigate the role of TLR4 activation in early-onset T2D.
- To test the hypothesis that immune cells from youth with T2D are more reactive to TLR4 stimulation than those from controls.
- To understand the biological mechanisms underlying T2D and its vascular complications in First Nations populations.
Main Methods:
- Assayed serum adipokines (adiponectin, leptin) and cytokines.
- Cultured freshly isolated peripheral blood mononuclear cells (PBMC) with TLR4 ligands: bacterial lipopolysaccharide (LPS) and palmitate.
- Measured TNF-α and IL-1β production in PBMC culture supernatants.
Main Results:
- Youth with T2D had lower serum adiponectin levels compared to controls.
- PBMC from T2D youth showed enhanced IL-1β synthesis upon stimulation with low-dose LPS and palmitate.
- Increased IL-1β production correlated with greater monocyte activation in the T2D cohort.
Conclusions:
- Preliminary findings indicate exaggerated cellular immune responses, particularly IL-1β activity, in youth with T2D.
- These cellular immune differences may play a role in the development of early-onset T2D.
- Further research can improve understanding and management of T2D and vascular complications in First Nations communities.
Introduction:
First Nations and other Aboriginal children are disproportionately affected by cardiometabolic diseases, including type 2 diabetes (T2D). In T2D, the disruption of insulin signalling can be driven by pro-inflammatory immunity. Pro-inflammatory responses can be fueled by toll-like receptors (TLR) on immune cells such as peripheral blood mononuclear cells (PBMC, a white blood cell population). TLR4 can bind to lipids from bacteria and food sources activating PBMC to produce cytokines tumour necrosis factor (TNF)-α and interleukin (IL)-1β. These cytokines can interfere with insulin signalling. Here, we seek to understand how TLR4 activation may be involved in early onset T2D. We hypothesized that immune cells from youth with T2D (n = 8) would be more reactive upon TLR4 stimulation relative to cells from age and body mass index (BMI)-matched controls without T2D (n = 8).
Methods:
Serum samples were assayed for adipokines (adiponectin and leptin), as well as cytokines. Freshly isolated PBMC were examined for immune reactivity upon culture with TLR4 ligands bacterial lipopolysaccharide (LPS, 2 and 0.2 ng/ml) and the fatty acid palmitate (200 µM). Culture supernatants were evaluated for the amount of TNF-α and IL-1β produced by PBMC.
Results:
Youth with T2D displayed lower median serum adiponectin levels compared to controls (395 vs. 904 ng/ml, p < 0.05). PBMC isolated from youth with and without T2D produced similar levels of TNF-α and IL-1β after exposure to the higher LPS concentration. However, at the low LPS dose the T2D cohort exhibited enhanced IL-1β synthesis relative to the control cohort. Additionally, exposure to palmitate resulted in greater IL-1β synthesis in PBMCs isolated from youth with T2D versus controls (p < 0.05). These differences in cytokine production corresponded to greater monocyte activation in the T2D cohort.
Conclusion:
These preliminary results suggest that cellular immune responses are exaggerated in T2D, particularly with respect to IL-1β activity. These studies aim to improve the understanding of the biology behind early onset T2D and its vascular complications that burden First Nations people.
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