The current competing renewal encompasses our wet lab human studies directed at understanding the natural history and pathogenesis of Type 1 diabetes and applying that knowledge to develop improved prediction of the disease. In parallel, with other funding, we study the NOD mouse model, and the two sets of studies are intersecting with the hypothesis that insulin is a primary target of the autoimmunity that leads to beta cell destruction. As demonstrated by these studies, multiple genetic factors contribute to the appearance of islet autoantibodies in prospectively followed children including DR,DQ, and DP alleles, insulin gene, and PTPN22 R620W polymorphisms, while some loci have little influence (CTLA4). In the last funding period we discovered that in children followed from birth alleles DPB1*0402 and DRB1*0403 almost completely prevent islet autoimmunity in children less than 10 years old. In the last study period we also collaborated with Dr. Hutton who discovered the fourth major islet autoantigen (ZnT8) to define the predictive potential of ZnT8 autoantibodies. In children followed from birth we have recently discovered that mean levels of insulin autoantibodies inversely correlate with rate of progression to diabetes with no correlation for GAD65 or IA-2 autoantibodies. In addition, we have initial promising data for a non-radioactive plate capture insulin autoantibody assay that promises with its precision, sensitivity and specificity, to allow us to explore determinants of insulin autoantibodies in children developing diabetes, new onset patients, twins and even normal controls. We believe our MSD insulin autoantibody assay utilizing proinsulin can be improved but even with its current performance will likely replace fluid phase insulin autoantibody radioassays. An important specific aim is to fully characterize the MSD insulin autoantibody assay and to test modifying N-Hydroxy-succinamide labeling and biotinylation of proinsulin to further enhance the assay. Given new assay technology with high precision we are now in a position to explore determinants of multiple levels of insulin autoantibodies, (e.g. higher levels correlating with rate of progression to diabetes and low insulin inhibitable levels found in normal controls which may be potentially genetically determined. We will test the hypothesis that levels of insulin autoantibodies are correlated with abnormalities of T lymphocytes targeting insulin similar to our studies in the NOD mouse and specifically levels of insulin autoantibodies mark the rate of beta cell autoimmunity. These studies should improve our ability to design trials for the prevention of Type 1 diabetes as we better define the natural history of the disease.
We have developed a plate capture non-radioactive assay for insulin autoantibodies that we believe will both revolutionize measurement of insulin autoantibodies and help inform our understanding of the natural history of Type 1 diabetes. In particular we will explore hypothesis that insulin autoantibodies are present at a low level in most individuals, and their levels in multiple autoantibody positive individuals inversely specifically correlate with rate of progression to diabetes.
|Zhao, Zhiyuan; Miao, Dongmei; Michels, Aaron et al. (2016) A multiplex assay combining insulin, GAD, IA-2 and transglutaminase autoantibodies to facilitate screening for pre-type 1 diabetes and celiac disease. J Immunol Methods 430:28-32|
|Steck, Andrea K; Dong, Fran; Waugh, Kathleen et al. (2016) Predictors of slow progression to diabetes in children with multiple islet autoantibodies. J Autoimmun 72:113-7|
|Fouts, Alexandra; Pyle, Laura; Yu, Liping et al. (2016) Do Electrochemiluminescence Assays Improve Prediction of Time to Type 1 Diabetes in Autoantibody-Positive TrialNet Subjects? Diabetes Care 39:1738-44|
|Frohnert, Brigitte I; Rewers, Marian J (2016) Metabolomics in childhood diabetes. Pediatr Diabetes 17:3-14|
|Elboudwarej, Emon; Cole, Michael; Briggs, Farren B S et al. (2016) Hypomethylation within gene promoter regions and type 1 diabetes in discordant monozygotic twins. J Autoimmun 68:23-9|
|Kodama, Keiichi; Zhao, Zhiyuan; Toda, Kyoko et al. (2016) Expression-Based Genome-Wide Association Study Links Vitamin D-Binding Protein With Autoantigenicity in Type 1 Diabetes. Diabetes 65:1341-9|
|Gesualdo, Patricia D; Bautista, Kimberly A; Waugh, Kathleen C et al. (2016) Feasibility of screening for T1D and celiac disease in a pediatric clinic setting. Pediatr Diabetes 17:441-8|
|Simmons, Kimber M; McFann, Kim; Taki, Iman et al. (2016) Reduced Bone Mineral Density Is Associated with Celiac Disease Autoimmunity in Children with Type 1 Diabetes. J Pediatr 169:44-48.e1|
|Lamb, Molly M; Frederiksen, Brittni; Seifert, Jennifer A et al. (2015) Sugar intake is associated with progression from islet autoimmunity to type 1 diabetes: the Diabetes Autoimmunity Study in the Young. Diabetologia 58:2027-34|
|Nakayama, Maki; McDaniel, Kristen; Fitzgerald-Miller, Lisa et al. (2015) Regulatory vs. inflammatory cytokine T-cell responses to mutated insulin peptides in healthy and type 1 diabetic subjects. Proc Natl Acad Sci U S A 112:4429-34|
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