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Results: 1 to 10 of 106

Publication Record


T-B Lymphocyte Interactions Promote Type 1 Diabetes Independently of SLAM-Associated Protein.
Bonami RH, Nyhoff LE, McNitt DH, Hulbert C, Felton JL, Kendall PL, Thomas JW
(2020) J Immunol 205: 3263-3276
MeSH Terms: Animals, Autoantibodies, B-Lymphocytes, Cell Communication, Diabetes Mellitus, Experimental, Diabetes Mellitus, Type 1, Mice, Mice, Inbred NOD, Mice, Transgenic, Signaling Lymphocytic Activation Molecule Associated Protein, Th1 Cells
Show Abstract · Added December 1, 2020
Signaling lymphocytic activation molecule-associated protein (SAP), a critical intracellular signaling molecule for T-B lymphocyte interactions, drives T follicular helper (Tfh) cell development in germinal centers (GCs). High-affinity islet autoantibodies predict type 1 diabetes (T1D) but do not cause β cell destruction. This paradox intimates Tfh cells as key pathologic effectors, consistent with an observed Tfh signature in T1D. To understand how fully developed Tfh (GC Tfh) contribute to different autoimmune processes, we investigated the role of SAP in T1D and autoantibody-mediated arthritis. Whereas spontaneous arthritis depended on in the autoantibody-mediated K/BxN model, organized insulitis and diabetes onset were unabated, despite a blocked anti-insulin vaccine response in -deficient NOD mice. GC Tfh and GC B cell development were blocked by loss of in K/BxN mice. In contrast, although GC B cell formation was markedly reduced in -deficient NOD mice, T cells with a GC Tfh phenotype were found at disease sites. CXCR3 CCR6 (Tfh1) subset bias was observed among GC Tfh cells infiltrating the pancreas of NOD mice, which was enhanced by loss of NOD T cells override requirement to undergo activation and proliferation in response to Ag presentation, demonstrating the potential for productive cognate T-B lymphocyte interactions in T1D-prone mice. We find that is essential when autoantibody-driven immune complexes promote inflammation but is not required for effective organ-specific autoimmune attack. Thus, Tfh induced in classic GC reactions are dispensable for T1D, but the autoimmune process in the NOD model retains pathogenic Tfh without .
Copyright © 2020 by The American Association of Immunologists, Inc.
1 Communities
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0 Resources
11 MeSH Terms
Treg sensitivity to FasL and relative IL-2 deprivation drive idiopathic aplastic anemia immune dysfunction.
Lim SP, Costantini B, Mian SA, Perez Abellan P, Gandhi S, Martinez Llordella M, Lozano JJ, Antunes Dos Reis R, Povoleri GAM, Mourikis TP, Abarrategi A, Ariza-McNaughton L, Heck S, Irish JM, Lombardi G, Marsh JCW, Bonnet D, Kordasti S, Mufti GJ
(2020) Blood 136: 885-897
MeSH Terms: Anemia, Aplastic, Animals, Apoptosis, Cells, Cultured, Fas Ligand Protein, Female, Humans, Immune System Diseases, Immune Tolerance, Interleukin-2, Male, Mice, Mice, Inbred NOD, Mice, SCID, Mice, Transgenic, T-Lymphocytes, Regulatory
Show Abstract · Added June 8, 2020
Idiopathic aplastic anemia (AA) has 2 key characteristics: an autoimmune response against hematopoietic stem/progenitor cells and regulatory T-cells (Tregs) deficiency. We have previously demonstrated reduction in a specific subpopulation of Treg in AA, which predicts response to immunosuppression. The aims of the present study were to define mechanisms of Treg subpopulation imbalance and identify potential for therapeutic intervention. We have identified 2 mechanisms that lead to skewed Treg composition in AA: first, FasL-mediated apoptosis on ligand interaction; and, second, relative interleukin-2 (IL-2) deprivation. We have shown that IL-2 augmentation can overcome these mechanisms. Interestingly, when high concentrations of IL-2 were used for in vitro Treg expansion cultures, AA Tregs were able to expand. The expanded populations expressed a high level of p-BCL-2, which makes them resistant to apoptosis. Using a xenograft mouse model, the function and stability of expanded AA Tregs were tested. We have shown that these Tregs were able to suppress the macroscopic clinical features and tissue manifestations of T-cell-mediated graft-versus-host disease. These Tregs maintained their suppressive properties as well as their phenotype in a highly inflammatory environment. Our findings provide an insight into the mechanisms of Treg reduction in AA. We have identified novel targets with potential for therapeutic interventions. Supplementation of ex vivo expansion cultures of Tregs with high concentrations of IL-2 or delivery of IL-2 directly to patients could improve clinical outcomes in addition to standard immunosuppressive therapy.
© 2020 by The American Society of Hematology.
1 Communities
1 Members
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16 MeSH Terms
Regulation of Diabetogenic Immunity by IL-15-Activated Regulatory CD8 T Cells in Type 1 Diabetes.
Stocks BT, Wilson CS, Marshall AF, Hoopes EM, Moore DJ
(2019) J Immunol 203: 158-166
MeSH Terms: Adoptive Transfer, Animals, B-Lymphocytes, CD8 Antigens, Cells, Cultured, Diabetes Mellitus, Type 1, Disease Models, Animal, Humans, Immunotherapy, Adoptive, Interleukin-15, Macrophages, Mice, Mice, Inbred NOD, NK Cell Lectin-Like Receptor Subfamily A, T-Lymphocytes, Regulatory
Show Abstract · Added May 28, 2019
Unchecked collaboration between islet-reactive T and B lymphocytes drives type 1 diabetes (T1D). In the healthy setting, CD8 T regulatory cells (Tregs) terminate ongoing T-B interactions. We determined that specific CD8 Tregs from NOD mice lack suppressive function, representing a previously unreported regulatory cell deficit in this T1D-prone strain. NOD mice possess 11-fold fewer Ly-49 CD8 Tregs than nonautoimmune mice, a deficiency that worsens as NOD mice age toward diabetes and leaves them unable to regulate CD4 T follicular helper cells. As IL-15 is required for Ly-49 CD8 Treg development, we determined that NOD macrophages inadequately -present IL-15. Despite reduced IL-15 -presentation, NOD Ly-49 CD8 Tregs can effectively transduce IL-15-mediated survival signals when they are provided. Following stimulation with an IL-15/IL-15Ra superagonist complex, Ly-49 CD8 Tregs expanded robustly and became activated to suppress the Ag-specific Ab response. IL-15/IL-15Ra superagonist complex-activated CD8CD122 T cells also delayed diabetes transfer, indicating the presence of an underactivated CD8 T cell subset with regulatory capacity against late stage T1D. We identify a new cellular contribution to anti-islet autoimmunity and demonstrate the correction of this regulatory cell deficit. Infusion of IL-15-activated CD8 Tregs may serve as an innovative cellular therapy for the treatment of T1D.
Copyright © 2019 by The American Association of Immunologists, Inc.
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1 Members
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15 MeSH Terms
Impaired insulin signaling in the B10.D2--/oSnJ mouse model of complement factor 5 deficiency.
Peterson KR, Gutierrez DA, Kikuchi T, Anderson-Baucum EK, Winn NC, Shuey MM, Bolus WR, McGuinness OP, Hasty AH
(2019) Am J Physiol Endocrinol Metab 317: E200-E211
MeSH Terms: Adenoviridae, Animals, Complement C5, Disease Models, Animal, Energy Metabolism, Glucose Intolerance, Hereditary Complement Deficiency Diseases, Insulin Resistance, Mice, Mice, Inbred AKR, Mice, Inbred C57BL, Mice, Inbred CBA, Mice, Inbred DBA, Mice, Inbred NOD, Mice, Transgenic, Signal Transduction, Transduction, Genetic
Show Abstract · Added March 3, 2020
Given the chemoattractant potential of complement factor 5 (C5) and its increased expression in adipose tissue (AT) of obese mice, we determined whether this protein of the innate immune system impacts insulin action. C5 control (C5) and spontaneously C5-deficient (C5, B10.D2--/oSnJ) mice were placed on low- and high-fat diets to investigate their inflammatory and metabolic phenotypes. Adenoviral delivery was used to evaluate the effects of exogenous C5 on systemic metabolism. C5 mice gained less weight than controls while fed a high-fat diet, accompanied by reduced AT inflammation, liver mass, and liver triglyceride content. Despite these beneficial metabolic effects, C5 mice demonstrated severe glucose intolerance and systemic insulin resistance, as well as impaired insulin signaling in liver and AT. C5 mice also exhibited decreased expression of insulin receptor (INSR) gene and protein, as well as improper processing of pro-INSR. These changes were not due to the C5 deficiency alone as other C5-deficient models did not recapitulate the INSR processing defect; rather, in addition to the mutation in the gene, whole genome sequencing revealed an intronic 31-bp deletion in the gene in the B10.D2--/oSnJ model. Irrespective of the genetic defect, adenoviral delivery of C5 improved insulin sensitivity in both C5 and C5 mice, indicating an insulin-sensitizing function of C5.
0 Communities
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MeSH Terms
B lymphocytes protect islet β cells in diabetes prone NOD mice treated with imatinib.
Wilson CS, Spaeth JM, Karp J, Stocks BT, Hoopes EM, Stein RW, Moore DJ
(2019) JCI Insight 5:
MeSH Terms: Animals, Autoimmunity, B-Lymphocytes, Cell Proliferation, Diabetes Mellitus, Type 1, Disease Models, Animal, Homeodomain Proteins, Hyperglycemia, Imatinib Mesylate, Insulin, Insulin-Secreting Cells, Islets of Langerhans, Maf Transcription Factors, Large, Mice, Mice, Inbred C57BL, Mice, Inbred NOD, Mice, Knockout
Show Abstract · Added April 10, 2019
Imatinib (Gleevec) reverses type 1 diabetes (T1D) in NOD mice and is currently in clinical trials in individuals with recent-onset disease. While research has demonstrated that imatinib protects islet β cells from the harmful effects of ER stress, the role the immune system plays in its reversal of T1D has been less well understood, and specific cellular immune targets have not been identified. In this study, we demonstrate that B lymphocytes, an immune subset that normally drives diabetes pathology, are unexpectedly required for reversal of hyperglycemia in NOD mice treated with imatinib. In the presence of B lymphocytes, reversal was linked to an increase in serum insulin concentration, but not an increase in islet β cell mass or proliferation. However, improved β cell function was reflected by a partial recovery of MafA transcription factor expression, a sensitive marker of islet β cell stress that is important to adult β cell function. Imatinib treatment was found to increase the antioxidant capacity of B lymphocytes, improving reactive oxygen species (ROS) handling in NOD islets. This study reveals a novel mechanism through which imatinib enables B lymphocytes to orchestrate functional recovery of T1D β cells.
0 Communities
1 Members
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17 MeSH Terms
Discovery of Potent Myeloid Cell Leukemia-1 (Mcl-1) Inhibitors That Demonstrate in Vivo Activity in Mouse Xenograft Models of Human Cancer.
Lee T, Christov PP, Shaw S, Tarr JC, Zhao B, Veerasamy N, Jeon KO, Mills JJ, Bian Z, Sensintaffar JL, Arnold AL, Fogarty SA, Perry E, Ramsey HE, Cook RS, Hollingshead M, Davis Millin M, Lee KM, Koss B, Budhraja A, Opferman JT, Kim K, Arteaga CL, Moore WJ, Olejniczak ET, Savona MR, Fesik SW
(2019) J Med Chem 62: 3971-3988
MeSH Terms: Animals, Antineoplastic Agents, Azepines, Binding Sites, Cell Line, Tumor, Cell Survival, Crystallography, X-Ray, Drug Evaluation, Preclinical, Female, Humans, Mice, Mice, Inbred NOD, Mice, SCID, Molecular Dynamics Simulation, Myeloid Cell Leukemia Sequence 1 Protein, Neoplasms, Protein Structure, Tertiary, Small Molecule Libraries, Structure-Activity Relationship, Xenograft Model Antitumor Assays
Show Abstract · Added April 15, 2019
Overexpression of myeloid cell leukemia-1 (Mcl-1) in cancers correlates with high tumor grade and poor survival. Additionally, Mcl-1 drives intrinsic and acquired resistance to many cancer therapeutics, including B cell lymphoma 2 family inhibitors, proteasome inhibitors, and antitubulins. Therefore, Mcl-1 inhibition could serve as a strategy to target cancers that require Mcl-1 to evade apoptosis. Herein, we describe the use of structure-based design to discover a novel compound (42) that robustly and specifically inhibits Mcl-1 in cell culture and animal xenograft models. Compound 42 binds to Mcl-1 with picomolar affinity and inhibited growth of Mcl-1-dependent tumor cell lines in the nanomolar range. Compound 42 also inhibited the growth of hematological and triple negative breast cancer xenografts at well-tolerated doses. These findings highlight the use of structure-based design to identify small molecule Mcl-1 inhibitors and support the use of 42 as a potential treatment strategy to block Mcl-1 activity and induce apoptosis in Mcl-1-dependent cancers.
0 Communities
1 Members
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20 MeSH Terms
Is a Tumor Suppressor Gene in Colorectal Cancer.
Chen MS, Lo YH, Chen X, Williams CS, Donnelly JM, Criss ZK, Patel S, Butkus JM, Dubrulle J, Finegold MJ, Shroyer NF
(2019) Mol Cancer Res 17: 697-708
MeSH Terms: Animals, Cell Line, Tumor, Colorectal Neoplasms, DNA-Binding Proteins, Genes, Tumor Suppressor, HCT116 Cells, HEK293 Cells, Heterografts, Humans, Male, Mice, Mice, Inbred NOD, Transcription Factors
Show Abstract · Added April 15, 2019
Colorectal cancer is the third most common cancer and the third leading cause of cancer death in the United States. Growth factor-independent 1 (GFI1) is a zinc finger transcriptional repressor responsible for controlling secretory cell differentiation in the small intestine and colon. GFI1 plays a significant role in the development of human malignancies, including leukemia, lung cancer, and prostate cancer. However, the role of GFI1 in colorectal cancer progression is largely unknown. Our results demonstrate that RNA and protein expression of GFI1 are reduced in advanced-stage nonmucinous colorectal cancer. Subcutaneous tumor xenograft models demonstrated that the reexpression of GFI1 in 4 different human colorectal cancer cell lines inhibits tumor growth. To further investigate the role of Gfi1 in colorectal tumorigenesis, we developed transgenic mice harboring a deletion of Gfi1 in the colon driven by CDX2-cre (Gfi1; CDX2-cre) and crossed them with Apc mice (Apc; Gfi1; CDX2-cre). Loss of Gfi1 significantly increased the total number of colorectal adenomas compared with littermate controls with an APC mutation alone. Furthermore, we found that compound (Apc; Gfi1; CDX2-cre) mice develop larger adenomas, invasive carcinoma, as well as hyperplastic lesions expressing the neuroendocrine marker chromogranin A, a feature that has not been previously described in APC-mutant tumors in mice. Collectively, these results demonstrate that acts as a tumor suppressor gene in colorectal cancer, where deficiency of Gfi1 promotes malignancy in the colon. IMPLICATIONS: These findings reveal that GFI1 functions as a tumor suppressor gene in colorectal tumorigenesis.
©2019 American Association for Cancer Research.
0 Communities
1 Members
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13 MeSH Terms
Ectonucleoside Triphosphate Diphosphohydrolase-3 Antibody Targets Adult Human Pancreatic β Cells for In Vitro and In Vivo Analysis.
Saunders DC, Brissova M, Phillips N, Shrestha S, Walker JT, Aramandla R, Poffenberger G, Flaherty DK, Weller KP, Pelletier J, Cooper T, Goff MT, Virostko J, Shostak A, Dean ED, Greiner DL, Shultz LD, Prasad N, Levy SE, Carnahan RH, Dai C, Sévigny J, Powers AC
(2019) Cell Metab 29: 745-754.e4
MeSH Terms: Adenosine Triphosphatases, Adult, Animals, Biomarkers, Cells, Cultured, Diabetes Mellitus, Type 1, Diabetes Mellitus, Type 2, Humans, Insulin-Secreting Cells, Islets of Langerhans, Male, Membrane Proteins, Mice, Mice, Inbred NOD, Pancreas, Young Adult
Show Abstract · Added February 4, 2019
Identification of cell-surface markers specific to human pancreatic β cells would allow in vivo analysis and imaging. Here we introduce a biomarker, ectonucleoside triphosphate diphosphohydrolase-3 (NTPDase3), that is expressed on the cell surface of essentially all adult human β cells, including those from individuals with type 1 or type 2 diabetes. NTPDase3 is expressed dynamically during postnatal human pancreas development, appearing first in acinar cells at birth, but several months later its expression declines in acinar cells while concurrently emerging in islet β cells. Given its specificity and membrane localization, we utilized an NTPDase3 antibody for purification of live human β cells as confirmed by transcriptional profiling, and, in addition, for in vivo imaging of transplanted human β cells. Thus, NTPDase3 is a cell-surface biomarker of adult human β cells, and the antibody directed to this protein should be a useful new reagent for β cell sorting, in vivo imaging, and targeting.
Copyright © 2018 Elsevier Inc. All rights reserved.
0 Communities
3 Members
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16 MeSH Terms
Healthy Donor Polyclonal IgMs Diminish B-Lymphocyte Autoreactivity, Enhance Regulatory T-Cell Generation, and Reverse Type 1 Diabetes in NOD Mice.
Wilson CS, Chhabra P, Marshall AF, Morr CV, Stocks BT, Hoopes EM, Bonami RH, Poffenberger G, Brayman KL, Moore DJ
(2018) Diabetes 67: 2349-2360
MeSH Terms: Animals, B-Lymphocytes, Diabetes Mellitus, Type 1, Immunoglobulin M, Mice, Mice, Inbred NOD, T-Lymphocytes, Regulatory
Show Abstract · Added August 23, 2018
Autoimmune diseases such as type 1 diabetes (T1D) arise from unrestrained activation of effector lymphocytes that destroy target tissues. Many efforts have been made to eliminate these effector lymphocytes, but none has produced a long-term cure. An alternative to depletion therapy is to enhance endogenous immune regulation. Among these endogenous alternatives, naturally occurring Igs have been applied for inflammatory disorders but have lacked potency in antigen-specific autoimmunity. We hypothesized that naturally occurring polyclonal IgMs, which represent the majority of circulating, noninduced antibodies but are present only in low levels in therapeutic Ig preparations, possess the most potent capacity to restore immune homeostasis. Treatment of diabetes-prone NOD mice with purified IgM isolated from Swiss Webster (SW) mice (nIgM) reversed new-onset diabetes, eliminated autoreactive B lymphocytes, and enhanced regulatory T-cell (Treg) numbers both centrally and peripherally. Conversely, IgM from prediabetic NOD mice could not restore this endogenous regulation, which represents an unrecognized component of T1D pathogenesis. Of note, IgM derived from healthy human donors was similarly able to expand human CD4 Tregs in humanized mice and produced permanent diabetes protection in treated NOD mice. Overall, these studies demonstrate that a potent, endogenous regulatory mechanism, nIgM, is a promising option for reversing autoimmune T1D in humans.
© 2018 by the American Diabetes Association.
0 Communities
2 Members
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7 MeSH Terms
Ultrasound Measurement of Vascular Density to Evaluate Response to Anti-Angiogenic Therapy in Renal Cell Carcinoma.
Rojas JD, Papadopoulou V, Czernuszewicz TJ, Rajamahendiran RM, Chytil A, Chiang YC, Chong DC, Bautch VL, Rathmell WK, Aylward S, Gessner RC, Dayton PA
(2019) IEEE Trans Biomed Eng 66: 873-880
MeSH Terms: Angiogenesis Inhibitors, Angiography, Animals, Carcinoma, Renal Cell, Drug Monitoring, Female, Heterografts, Kidney, Kidney Neoplasms, Mice, Mice, Inbred NOD, Mice, SCID, Microvessels, Ultrasonography
Show Abstract · Added October 30, 2019
BACKGROUND - Functional and molecular changes often precede gross anatomical changes, so early assessment of a tumor's functional and molecular response to therapy can help reduce a patient's exposure to the side effects of ineffective chemotherapeutics or other treatment strategies.
OBJECTIVE - Our intent was to test the hypothesis that an ultrasound microvascular imaging approach might provide indications of response to therapy prior to assessment of tumor size.
METHODS - Mice bearing clear-cell renal cell carcinoma xenograft tumors were treated with antiangiogenic and Notch inhibition therapies. An ultrasound measurement of microvascular density was used to serially track the tumor response to therapy.
RESULTS - Data indicated that ultrasound-derived microvascular density can indicate response to therapy a week prior to changes in tumor volume and is strongly correlated with physiological characteristics of the tumors as measured by histology ([Formula: see text]). Furthermore, data demonstrated that ultrasound measurements of vascular density can determine response to therapy and classify between-treatment groups with high sensitivity and specificity.
CONCLUSION/SIGNIFICANCE - Results suggests that future applications utilizing ultrasound imaging to monitor tumor response to therapy may be able to provide earlier insight into tumor behavior from metrics of microvascular density rather than anatomical tumor size measurements.
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14 MeSH Terms