Type 1 diabetes (T1DM) is a T cell mediated autoimmune disease. In the early stages of the autoimmune response, naive autoreactive T cells migrate from blood into pancreatic lymph nodes where they meet Beta cell antigens; memory/effector offspring of these T cells then migrate from blood into islets to initiate the inflammation that leads to Beta cell destruction. The migration of lymphocytes from blood into tissues requires tissue-selective multistep cascades with sequential lymphocyte/endothelial adhesion and activation steps. Our goals are to identify the endothelial adhesion and activating molecules (such as chemokines) that are expressed in pancreatic lymph nodes and islets in the early stages of inflammation, to define the roles of these molecules in lymphocyte recruitment to these sites and in the initiation of the autoimmune response, and to determine which molecules are therapeutic targets for the prevention of T1DM. RESEARCH PLANS AND METHODS We will use tissue section immunohistology, suspension immunofluorescence staining with flow cytometry, and laser capture microdissection (LCM) with RT-PCR to determine which adhesion molecules, chemokines, and chemokine receptors are present in pancreatic lymph nodes (Aim 1) and islets (Aim 2) of nonobese diabetic (NOD) mice in the early stages of the autoimmune process. The physiologic roles of these molecules in the migration of naive autoreactive T cells into pancreatic lymph nodes (Aim 1) and in the production of memory/effector T cells which migrate to islets (Aim 2) will be defined using in vivo lymphocyte migration assays.
In Aim 3, we will work closely with Dr. Hugh McDevitt to determine the effects of TNFalpha and anti- TNFalpha on lymphocyte migration pathways and on the development of autoimmunity or tolerance.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Project (R01)
Project #
1R01DK067592-01A1
Application #
6866932
Study Section
Hypersensitivity, Autoimmune, and Immune-mediated Diseases Study Section (HAI)
Program Officer
Spain, Lisa M
Project Start
2005-03-01
Project End
2009-01-31
Budget Start
2005-03-01
Budget End
2006-01-31
Support Year
1
Fiscal Year
2005
Total Cost
$280,765
Indirect Cost
Name
Stanford University
Department
Pathology
Type
Schools of Medicine
DUNS #
009214214
City
Stanford
State
CA
Country
United States
Zip Code
94305
Xu, Baohui; Cook, Rachel E; Michie, Sara A (2010) Alpha4beta7 integrin/MAdCAM-1 adhesion pathway is crucial for B cell migration into pancreatic lymph nodes in nonobese diabetic mice. J Autoimmun 35:124-9
Mukundan, Lata; Odegaard, Justin I; Morel, Christine R et al. (2009) PPAR-delta senses and orchestrates clearance of apoptotic cells to promote tolerance. Nat Med 15:1266-72
Li, Qing; Xu, Baohui; Michie, Sara A et al. (2008) Interferon-alpha initiates type 1 diabetes in nonobese diabetic mice. Proc Natl Acad Sci U S A 105:12439-44
Kvezereli, M; Michie, S A; Yu, T et al. (2008) TSG-6 protein expression in the pancreatic islets of NOD mice. J Mol Histol 39:585-93
Shen, Wen-Jun; Liang, Yu; Wang, Jenny et al. (2007) Regulation of hormone-sensitive lipase in islets. Diabetes Res Clin Pract 75:14-26