Biomedical Research Education & Training
Faculty Member

Kendall, Peggy L., M.D.
Assistant Professor of Medicine
Assistant Professor of Pathology, Microbiology and Immunology

Lab Url: N/A

Phone Number:

Email Address: peggy.l.kendall@vanderbilt.edu

Kendall, Peggy's picture
Academic history
M.D., Univ of Texas Southwestern
B.S., Univ of Texas, Austin

Office Address   Mailing Address

S1116 MCN

T-3219 MCN 2650


Research Keywords
autoimmunity, B lymphocytes, type 1 diabetes, tertiary lymphoid organs, bruton's tyrosine kinase,Immunology

Research Specialty
The role of B lymphocytes in type 1 diabetes.

Research Description
The Kendall lab studies the role of B lymphocytes in Type 1 diabetes (T1D). Our long-term goal is to selectively block the survival and function of autoreactive B lymphocytes in this disease, while leaving normal cells available to fight infection. To do this, we study both autoreactive cellular activities in inflamed tissue, and B lymphocyte signaling events that allow the emergence and pathogenic function of autoreactive cells.

B lymphocytes promote T1D by acting as essential antigen-presenting cells to autoreactive T cells. Those T cells then mediate the destruction of pancreatic islets, resulting in loss of insulin-production, with downstream hyperglycemia and diabetes development. Inflamed pancreatic islets contain both T and B lymphocytes, organized into tertiary lymphoid structures (TLS). We use the nonobese diabetic (NOD) mouse to investigate the identity and function of these islet-invading B lymphocytes. We have discovered that B lymphocytes in diseased pancreas have a polyclonal repertoire overall, but are oligoclonal in each islet. The B cell repertoire is distinct from that in draining pancreatic lymph nodes, indicating a selective process in the inflamed tissue. The B cell receptors (BCRs) in these islets show evidence of somatic hypermutation (SHM), suggestive of T-B cellular interactions. We have also found that the B lymphocyte chemoattractant CXCL13 supports T-B cellular organization in the TLS. Surprisingly, TLS organization in this setting proves to be unnecessary for the selection of the B lymphocyte repertoire into the target tissue, for SHM of BCRs, or for diabetes development. Therefore, while TLS in nonimmune tissues appear morphologically similar to secondary lymphoid tissues, they may differ in important ways, including B lymphocyte antigenic selection, repertoire maturation, and the chemotactic factors underlying cellular recruitment and organization. Additional experiments have shown that autoreactive B cells infiltrate the islets, while nonautoreactive B cells do not, resulting in T-cell insulitis that does not cause diabetes. A future goal is to understand the factors that govern the trafficking and selection of these B lymphocytes into inflamed islets, and to develop methods of blocking islet infiltration.

A second line of investigation regards the contribution of B lymphocyte signaling to autoreactivity in T1D. Brutona??s tyrosine kinase (BTK) contributes to the propogation of signals from the BCR, leading to downstream calcium flux and nuclear translocation of transcription factors, including NFI?B. BTK is a multidomained cytosolic tec kinase that serves as an adaptor, as well as a kinase, molecule. It is critical to B lymphocyte, but not T lymphocyte function. We have discovered that BTK supports T1D in the NOD model. Genetic depletion of BTK from NOD mice resulted in significant disease protection (83% healthy, vs. 31% of BTK-sufficient littermates), even though 90% of the B lymphocyte population in these mice survived. Disease-protection was abrogated by introduction of a transgenic anti-insulin BCR that forces the emergence of autoreactive B cells. We are now working to characterize the specific mechanisms underlying disease protection in this model, and to test the ability of specific BTK-inhibitors to prevent and reverse T1D.

Publications
Kendall, PL, Case, JB, Sullivan, AM, Holderness, JS, Wells, KS, Liu, E, Thomas, JW. Tolerant Anti-Insulin B Cells Are Effective APCs. J Immunol, 2013

Henry, RA, Kendall, PL, Thomas, JW. Autoantigen-specific B-cell depletion overcomes failed immune tolerance in type 1 diabetes. Diabetes, 61(8), 2037-44, 2012

Henry, RA, Kendall, PL. CXCL13 blockade disrupts B lymphocyte organization in tertiary lymphoid structures without altering B cell receptor bias or preventing diabetes in nonobese diabetic mice. J Immunol, 185(3), 1460-5, 2010 PMCID:2950856

Henry, RA, Kendall, PL, Woodward, EJ, Hulbert, C, Thomas, JW. Vkappa polymorphisms in NOD mice are spread throughout the entire immunoglobulin kappa locus and are shared by other autoimmune strains. Immunogenetics, 62(8), 507-20, 2010 PMCID:2970566

Moore, DJ, Zienkiewicz, J, Kendall, PL, Liu, D, Liu, X, Veach, RA, Collins, RD, Hawiger, J. In vivo islet protection by a nuclear import inhibitor in a mouse model of type 1 diabetes. PLoS One, 5(10), e13235, 2010 PMCID:2950856

Boomershine, CS, Chamberlain, A, Kendall, P, Afshar-Sharif, AR, Huang, H, Washington, MK, Lawson, WE, Thomas, JW, Blackwell, TS, Bhowmick, NA. Autoimmune pancreatitis results from loss of TGFbeta signalling in S100A4-positive dendritic cells. Gut, 58(9), 1267-74, 2009 PMCID:2719085

Kendall, PL, Moore, DJ, Hulbert, C, Hoek, KL, Khan, WN, Thomas, JW. Reduced diabetes in btk-deficient nonobese diabetic mice and restoration of diabetes with provision of an anti-insulin IgH chain transgene. J Immunol, 183(10), 6403-12, 2009

Kendall, PL, Yu, G, Woodward, EJ, Thomas, JW. Tertiary lymphoid structures in the pancreas promote selection of B lymphocytes in autoimmune diabetes. J Immunol, 178(9), 5643-51, 2007

Kendall, PL, Woodward, EJ, Hulbert, C, Thomas, JW. Peritoneal B cells govern the outcome of diabetes in non-obese diabetic mice. Eur J Immunol, 34(9), 2387-95, 2004

Thomas, JW, Kendall, PL, Mitchell, HG. The natural autoantibody repertoire of nonobese diabetic mice is highly active. J Immunol, 169(11), 6617-24, 2002


Postdoctoral Position Available
No

Postdoctoral Position Details
N/A

Updated Date
03/18/2013