The overall objective of this study is to determine whether systemic inflammation in diabetes and obesity persists because of a failure of endogenous pathways that normally resolve inflammation. Our working hypothesis is that chronic inflammation in T2D and obesity is sustained in part due to a deficiency in specialized pro-resolving lipid mediator (SPM)-stimulated resolution, which impairs wound healing. To test this hypothesis, we will assess the development and resolution of acute inflammation in wild type and obese-diabetic mice and determine how SPM pathways are affected by nutrient excess. We will also perform a targeted lipidomic analysis of adipose tissue and plasma obtained from obese diabetic and non-diabetic humans undergoing bariatric surgery to elucidate whether SPM biosynthesis is associated with inflammation and metabolic parameters. Utilizing these approaches, we will be able to elucidate how diabetes impacts resolution of inflammation and determine how SPM pathways are modulated in obese and diabetic humans. Lastly, to test the efficacy of SPM in treating clinically-relevant manifestations of diabetes, we will determine whether promoting resolution will decrease inflammation and enhance wound healing in a rodent model of cutaneous wound healing. We expect that this project will generate new knowledge regarding the mechanisms that sustain chronic inflammation in T2D and move the field forward by testing the efficacy of SPM in preventing not just systemic insulin resistance, bu also specific clinical manifestations of diabetes such as impaired wound healing. In addition, these studies will determine the association between insulin resistance and SPM pathways in obese humans, which has not been previously assessed. Completion of these translational studies will lead to a better understanding of the mechanisms that sustain chronic inflammation in obesity and diabetes;an understanding that will open up new avenues for exploring a novel set of therapies for attenuating inflammation and promoting wound healing in diabetic patients.

Public Health Relevance

Results of this project will provide a new understanding of the mechanistic basis whereby diabetics suffer from delayed wound healing and chronic inflammation. These studies could lead to the development of new therapeutics aimed at resolving inflammation.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Postdoctoral Individual National Research Service Award (F32)
Project #
5F32HL116186-02
Application #
8639973
Study Section
Special Emphasis Panel (ZRG1-F06-T (20))
Program Officer
Meadows, Tawanna
Project Start
2013-03-01
Project End
2016-02-29
Budget Start
2014-03-01
Budget End
2015-02-28
Support Year
2
Fiscal Year
2014
Total Cost
$53,282
Indirect Cost
Name
University of Louisville
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
057588857
City
Louisville
State
KY
Country
United States
Zip Code
40292
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Billeter, Adrian T; Hellmann, Jason; Roberts, Henry et al. (2014) MicroRNA-155 potentiates the inflammatory response in hypothermia by suppressing IL-10 production. FASEB J 28:5322-36
Hellmann, Jason; Zhang, Michael J; Tang, Yunan et al. (2013) Increased saturated fatty acids in obesity alter resolution of inflammation in part by stimulating prostaglandin production. J Immunol 191:1383-92