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Articles 61 - 69 of 69
Full-Text Articles in Medical Immunology
Stimulation Through Tlr4 Increases Fviii Inhibitor Formation In A Mouse Model Of Hemophilia A, Claire K. Holley
Stimulation Through Tlr4 Increases Fviii Inhibitor Formation In A Mouse Model Of Hemophilia A, Claire K. Holley
Dissertations and Theses (Open Access)
Hemophilia A is a clotting disorder caused by functional factor VIII (FVIII) deficiency. About 25% of patients treated with therapeutic recombinant FVIII develop antibodies (inhibitors) that render subsequent FVIII treatments ineffective. The immune mechanisms of inhibitor formation are not entirely understood, but circumstantial evidence indicates a role for increased inflammatory response, possibly via stimulation of Toll-like receptors (TLRs), at the time of FVIII immunization. I hypothesized that stimulation through TLR4 in conjunction with FVIII treatments would increase the formation of FVIII inhibitors. To test this hypothesis, FVIII K.O. mice were injected with recombinant human FVIII with or without concomitant doses …
Neuroinflammation And Psychiatric Illness, Souhel Najjar, Daniel M. Pearlman, Kenneth Alper, Amanda Najjar, Orrin Devinsky
Neuroinflammation And Psychiatric Illness, Souhel Najjar, Daniel M. Pearlman, Kenneth Alper, Amanda Najjar, Orrin Devinsky
Dartmouth Scholarship
Multiple lines of evidence support the pathogenic role of neuroinflammation in psychiatric illness. While systemic autoimmune diseases are well-documented causes of neuropsychiatric disorders, synaptic autoimmune encephalitides with psychotic symptoms often go under-recognized. Parallel to the link between psychiatric symptoms and autoimmunity in autoimmune diseases, neuroimmunological abnormalities occur in classical psychiatric disorders (for example, major depressive, bipolar, schizophrenia, and obsessive-compulsive disorders). Investigations into the pathophysiology of these conditions traditionally stressed dysregulation of the glutamatergic and monoaminergic systems, but the mechanisms causing these neurotransmitter abnormalities remained elusive. We review the link between autoimmunity and neuropsychiatric disorders, and the human and experimental evidence …
Influenza-Infected Neutrophils Within The Infected Lungs Act As Antigen Presenting Cells For Anti-Viral Cd8+ T Cells, Matthew M. Hufford, Graham Richardson, Haixia Zhou, Balaji Manicassamy, Adolfo Garcia-Sastre, Richard I. Enelow, Thomas J. Braciale
Influenza-Infected Neutrophils Within The Infected Lungs Act As Antigen Presenting Cells For Anti-Viral Cd8+ T Cells, Matthew M. Hufford, Graham Richardson, Haixia Zhou, Balaji Manicassamy, Adolfo Garcia-Sastre, Richard I. Enelow, Thomas J. Braciale
Dartmouth Scholarship
Influenza A virus (IAV) is a leading cause of respiratory tract disease worldwide. Anti-viral CD8+ T lymphocytes responding to IAV infection are believed to eliminate virally infected cells by direct cytolysis but may also contribute to pulmonary inflammation and tissue damage via the release of pro-inflammatory mediators following recognition of viral antigen displaying cells. We have previously demonstrated that IAV antigen expressing inflammatory cells of hematopoietic origin within the infected lung interstitium serve as antigen presenting cells (APC) for infiltrating effector CD8+ T lymphocytes; however, the spectrum of inflammatory cell types capable of serving as APC was not …
Neurosteroid-Mediated Regulation Of Brain Innate Immunity In Hiv/Aids: Dhea-S Suppresses Neurovirulence, Amber Paul, Ferdinand G. Maingat, Maria J. Polyak, Pornpun Vivithanaporn, Farshid Noorbakhsh, Samir Ahboucha, Glen B. Baker, Keir Pearson, Christopher Power
Neurosteroid-Mediated Regulation Of Brain Innate Immunity In Hiv/Aids: Dhea-S Suppresses Neurovirulence, Amber Paul, Ferdinand G. Maingat, Maria J. Polyak, Pornpun Vivithanaporn, Farshid Noorbakhsh, Samir Ahboucha, Glen B. Baker, Keir Pearson, Christopher Power
Publications
Neurosteroids are cholesterol-derived molecules synthesized within the brain, which exert trophic and protective actions. Infection by human and feline immunodeficiency viruses (HIV and FIV, respectively) causes neuroinflammation and neurodegeneration, leading to neurological deficits. Secretion of neuroinflammatory host and viral factors by glia and infiltrating leukocytes mediates the principal neuropathogenic mechanisms during, although the effect of neurosteroids on these processes is unknown. We investigated the interactions between neurosteroid mediated effects and lentivirus infection outcomes. Analyses of HIV-infected uninfected human brains disclosed a reduction in neurosteroid synthesis enzyme expression. Human neurons exposed to supernatants from HIV macrophages exhibited suppressed enzyme expression without …
Tryptophan Hydroxylase-1 Regulates Immune Tolerance And Inflammation, Elizabeth C. Nowak, Victor C. De Vries, Anna Wasiuk, Cory Ahonen, Kathryn A. Bennett, Isabelle Le Mercier, Dae-Gon Ha, Randolph J. Noelle
Tryptophan Hydroxylase-1 Regulates Immune Tolerance And Inflammation, Elizabeth C. Nowak, Victor C. De Vries, Anna Wasiuk, Cory Ahonen, Kathryn A. Bennett, Isabelle Le Mercier, Dae-Gon Ha, Randolph J. Noelle
Dartmouth Scholarship
Nutrient deprivation based on the loss of essential amino acids by catabolic enzymes in the microenvironment is a critical means to control in ammatory responses and immune tolerance. Here we report the novel nding that Tph-1 (tryptophan hydroxylase-1), a synthase which catalyses the conversion of tryptophan to serotonin and exhausts tryptophan, is a potent regulator of immunity. In models of skin allograft tolerance, tumor growth, and experimental autoimmune encephalomyelitis, Tph-1 de ciency breaks allograft tolerance, induces tumor remission, and intensi es neuroin ammation, respectively. All of these effects of Tph-1 de ciency are independent of its downstream product serotonin. Because …
Triterpenoid Modulation Of Il-17 And Nrf-2 Expression Ameliorates Neuroinflammation And Promotes Remyelination In Autoimmune Encephalomyelitis, Tej K. Pareek, Abdelmadjid Belkadi, Sashi Kesavapany, Anita Zaremba, Sook L. Loh, Lianhua Bai, Mark L. Cohen, Colin Meyer, Karen T. Liby, Robert H. Miller, Michael B. Sporn, John J. Letterio
Triterpenoid Modulation Of Il-17 And Nrf-2 Expression Ameliorates Neuroinflammation And Promotes Remyelination In Autoimmune Encephalomyelitis, Tej K. Pareek, Abdelmadjid Belkadi, Sashi Kesavapany, Anita Zaremba, Sook L. Loh, Lianhua Bai, Mark L. Cohen, Colin Meyer, Karen T. Liby, Robert H. Miller, Michael B. Sporn, John J. Letterio
Dartmouth Scholarship
Inflammatory cytokines and endogenous anti-oxidants are variables affecting disease progression in multiple sclerosis (MS). Here we demonstrate the dual capacity of triterpenoids to simultaneously repress production of IL-17 and other pro-inflammatory mediators while exerting neuroprotective effects directly through Nrf2-dependent induction of anti-oxidant genes. Derivatives of the natural triterpene oleanolic acid, namely CDDO-trifluoroethyl-amide (CDDO-TFEA), completely suppressed disease in a murine model of MS, experimental autoimmune encephalomyelitis (EAE), by inhibiting Th1 and Th17 mRNA and cytokine production. Encephalitogenic T cells recovered from treated mice were hypo-responsive to myelin antigen and failed to adoptively transfer the disease. Microarray analyses showed significant suppression of …
A Retinoic Acid–Dependent Checkpoint In The Development Of Cd4+ T Cell–Mediated Immunity, Karina Pino-Lagos, Yanxia Guo, Chrysothemis Brown, Matthew P. Alexander, Raúl Elgueta, Kathryn A. Bennett, Victor De Vries, Elizabeth Nowak, Rune Blomhoff, Shanthini Sockanathan, Roshantha A. Chandraratna, Ethan Dmitrovsky, Randolph J. Noelle
A Retinoic Acid–Dependent Checkpoint In The Development Of Cd4+ T Cell–Mediated Immunity, Karina Pino-Lagos, Yanxia Guo, Chrysothemis Brown, Matthew P. Alexander, Raúl Elgueta, Kathryn A. Bennett, Victor De Vries, Elizabeth Nowak, Rune Blomhoff, Shanthini Sockanathan, Roshantha A. Chandraratna, Ethan Dmitrovsky, Randolph J. Noelle
Dartmouth Scholarship
It is known that vitamin A and its metabolite, retinoic acid (RA), are essential for host defense. However, the mechanisms for how RA controls inflammation are incompletely understood. The findings presented in this study show that RA signaling occurs concurrent with the development of inflammation. In models of vaccination and allogeneic graft rejection, whole body imaging reveals that RA signaling is temporally and spatially restricted to the site of inflammation. Conditional ablation of RA signaling in T cells significantly interferes with CD4+ T cell effector function, migration, and polarity. These findings provide a new perspective of the role of …
Association Between Chronic Liver And Colon Inflammation During The Development Of Murine Syngeneic Graft-Versus-Host Disease, Jason Anthony Brandon, Jacqueline Perez-Rodriguez, C. Darrell Jennings, Donald A. Cohen, Vishal J. Sindhava, Subbarao Bondada, Alan M. Kaplan, J. Scott Bryson
Association Between Chronic Liver And Colon Inflammation During The Development Of Murine Syngeneic Graft-Versus-Host Disease, Jason Anthony Brandon, Jacqueline Perez-Rodriguez, C. Darrell Jennings, Donald A. Cohen, Vishal J. Sindhava, Subbarao Bondada, Alan M. Kaplan, J. Scott Bryson
Microbiology, Immunology, and Molecular Genetics Faculty Publications
The murine model of cyclosporine A (CsA)-induced syngeneic graft-versus-host disease (SGVHD) is a bone marrow (BM) transplantation model that develops chronic colon inflammation identical to other murine models of CD4+ T cell-mediated colitis. Interestingly, SGVHD animals develop chronic liver lesions that are similar to the early peribiliary inflammatory stages of clinical chronic liver disease, which is frequently associated with inflammatory bowel disease (IBD). Therefore, studies were initiated to investigate the chronic liver inflammation that develops in the SGVHD model. To induce SGVHD, mice were lethally irradiated, reconstituted with syngeneic BM, and treated with CsA. All of the SGVHD animals …
Phenotypic Alterations In Type Ii Alveolar Epithelial Cells In Cd4+ T Cell Mediated Lung Inflammation, Marcus Gereke, Lothar Gröbe, Silvia Prettin, Michael Kasper, Stefanie Deppenmeier, Achim D. Gruber, Richard I. Enelow, Jan Buer, Dunja Bruder
Phenotypic Alterations In Type Ii Alveolar Epithelial Cells In Cd4+ T Cell Mediated Lung Inflammation, Marcus Gereke, Lothar Gröbe, Silvia Prettin, Michael Kasper, Stefanie Deppenmeier, Achim D. Gruber, Richard I. Enelow, Jan Buer, Dunja Bruder
Dartmouth Scholarship
Although the contribution of alveolar type II epithelial cell (AEC II) activities in various aspects of respiratory immune regulation has become increasingly appreciated, our understanding of the contribution of AEC II transcriptosome in immunopathologic lung injury remains poorly understood. We have previously established a mouse model for chronic T cell-mediated pulmonary inflammation in which influenza hemagglutinin (HA) is expressed as a transgene in AEC II, in mice expressing a transgenic T cell receptor specific for a class II-restricted epitope of HA. Pulmonary inflammation in these mice occurs as a result of CD4+ T cell recognition of alveolar antigen. This model …