Other search tools

About this data

The publication data currently available has been vetted by Vanderbilt faculty, staff, administrators and trainees. The data itself is retrieved directly from NCBI's PubMed and is automatically updated on a weekly basis to ensure accuracy and completeness.

If you have any questions or comments, please contact us.

Results: 1 to 10 of 607

Publication Record

Connections

VacA Targets Myeloid Cells in the Gastric Lamina Propria To Promote Peripherally Induced Regulatory T-Cell Differentiation and Persistent Infection.
Altobelli A, Bauer M, Velez K, Cover TL, Müller A
(2019) MBio 10:
MeSH Terms: Animals, Bacterial Proteins, Cell Differentiation, Dendritic Cells, Disease Models, Animal, Gastric Mucosa, Helicobacter Infections, Helicobacter pylori, Immune Evasion, Interleukin-10, Interleukin-23, Lung, Macrophages, Mice, Mucous Membrane, Myeloid Cells, T-Lymphocytes, Regulatory, Transforming Growth Factor beta
Show Abstract · Added April 11, 2019
The gastric bacterium causes a persistent infection that is directly responsible for gastric ulcers and gastric cancer in some patients and protective against allergic and other immunological disorders in others. The two outcomes of the -host interaction can be modeled in mice that are infected as immunocompetent adults and as neonates, respectively. Here, we have investigated the contribution of the immunomodulator VacA to -specific local and systemic immune responses in both models. We found that neonatally infected mice are colonized at higher levels than mice infected as adults and fail to generate effector T-cell responses to the bacteria; rather, T-cell responses in neonatally infected mice are skewed toward Foxp3-positive (Foxp3) regulatory T cells that are neuropilin negative and express RORγt. We found these peripherally induced regulatory T cells (pTregs) to be enriched, in a VacA-dependent manner, not only in the gastric mucosa but also in the lungs of infected mice. Pulmonary pTreg accumulation was observed in mice that have been infected neonatally with wild-type but not in mice that have been infected as adults or mice infected with a VacA null mutant. Finally, we traced VacA to gastric lamina propria myeloid cells and show that it suppressed interleukin-23 (IL-23) expression by dendritic cells and induced IL-10 and TGF-β expression in macrophages. Taken together, the results are consistent with the idea that creates a tolerogenic environment through its immunomodulator VacA, which skews T-cell responses toward Tregs, favors persistence, and affects immunity at distant sites. has coexisted with humans for at least 60.000 years and has evolved persistence strategies that allow it to evade host immunity and colonize its host for life. The VacA protein is expressed by all strains and is required for high-level persistent infection in experimental mouse models. Here, we show that VacA targets myeloid cells in the gastric mucosa to create a tolerogenic environment that facilitates regulatory T-cell differentiation, while suppressing effector T-cell priming and functionality. Tregs that are induced in the periphery during infection can be found not only in the stomach but also in the lungs of infected mice, where they are likely to affect immune responses to allergens.
Copyright © 2019 Altobelli et al.
0 Communities
1 Members
0 Resources
18 MeSH Terms
Nonsteroidal Anti-inflammatory Drugs Alter the Microbiota and Exacerbate Colitis while Dysregulating the Inflammatory Response.
Maseda D, Zackular JP, Trindade B, Kirk L, Roxas JL, Rogers LM, Washington MK, Du L, Koyama T, Viswanathan VK, Vedantam G, Schloss PD, Crofford LJ, Skaar EP, Aronoff DM
(2019) MBio 10:
MeSH Terms: Animals, Anti-Inflammatory Agents, Non-Steroidal, CD4-Positive T-Lymphocytes, Clostridium Infections, Gastrointestinal Microbiome, Indomethacin, Intestinal Mucosa, Mice, Neutrophils, Prostaglandins, Survival Analysis
Show Abstract · Added April 7, 2019
infection (CDI) is a major public health threat worldwide. The use of nonsteroidal anti-inflammatory drugs (NSAIDs) is associated with enhanced susceptibility to and severity of CDI; however, the mechanisms driving this phenomenon have not been elucidated. NSAIDs alter prostaglandin (PG) metabolism by inhibiting cyclooxygenase (COX) enzymes. Here, we found that treatment with the NSAID indomethacin prior to infection altered the microbiota and dramatically increased mortality and the intestinal pathology associated with CDI in mice. We demonstrated that in -infected animals, indomethacin treatment led to PG deregulation, an altered proinflammatory transcriptional and protein profile, and perturbed epithelial cell junctions. These effects were paralleled by increased recruitment of intestinal neutrophils and CD4 cells and also by a perturbation of the gut microbiota. Together, these data implicate NSAIDs in the disruption of protective COX-mediated PG production during CDI, resulting in altered epithelial integrity and associated immune responses. infection (CDI) is a spore-forming anaerobic bacterium and leading cause of antibiotic-associated colitis. Epidemiological data suggest that use of nonsteroidal anti-inflammatory drugs (NSAIDs) increases the risk for CDI in humans, a potentially important observation given the widespread use of NSAIDs. Prior studies in rodent models of CDI found that NSAID exposure following infection increases the severity of CDI, but mechanisms to explain this are lacking. Here we present new data from a mouse model of antibiotic-associated CDI suggesting that brief NSAID exposure prior to CDI increases the severity of the infectious colitis. These data shed new light on potential mechanisms linking NSAID use to worsened CDI, including drug-induced disturbances to the gut microbiome and colonic epithelial integrity. Studies were limited to a single NSAID (indomethacin), so future studies are needed to assess the generalizability of our findings and to establish a direct link to the human condition.
Copyright © 2019 Maseda et al.
0 Communities
1 Members
0 Resources
11 MeSH Terms
How Superantigens Bind MHC.
Van Kaer L
(2018) J Immunol 201: 1817-1818
MeSH Terms: Animals, Antigens, Bacterial, Clonal Deletion, Enterotoxins, Histocompatibility Antigens, Humans, Lymphocyte Activation, Minor Lymphocyte Stimulatory Antigens, Peptide Fragments, Protein Binding, Receptors, Antigen, T-Cell, alpha-beta, Superantigens, T-Lymphocytes
Added March 26, 2019
0 Communities
1 Members
0 Resources
13 MeSH Terms
High CD8 T-Cell Receptor Clonality and Altered CDR3 Properties Are Associated With Elevated Isolevuglandins in Adipose Tissue During Diet-Induced Obesity.
McDonnell WJ, Koethe JR, Mallal SA, Pilkinton MA, Kirabo A, Ameka MK, Cottam MA, Hasty AH, Kennedy AJ
(2018) Diabetes 67: 2361-2376
MeSH Terms: Adipose Tissue, Animals, CD8-Positive T-Lymphocytes, Complementarity Determining Regions, Diet, High-Fat, Glucose Tolerance Test, Insulin Resistance, Liver, Male, Mice, Obesity, Prostaglandins
Show Abstract · Added March 26, 2019
Adipose tissue (AT) CD4 and CD8 T cells contribute to obesity-associated insulin resistance. Prior studies identified conserved T-cell receptor (TCR) chain families in obese AT, but the presence and clonal expansion of specific TCR sequences in obesity has not been assessed. We characterized AT and liver CD8 and CD4 TCR repertoires of mice fed a low-fat diet (LFD) and high-fat diet (HFD) using deep sequencing of the TCRβ chain to quantify clonal expansion, gene usage, and CDR3 sequence. In AT CD8 T cells, HFD reduced TCR diversity, increased the prevalence of public TCR clonotypes, and selected for TCR CDR3 regions enriched in positively charged and less polarized amino acids. Although TCR repertoire alone could distinguish between LFD- and HFD-fed mice, these properties of the CDR3 region of AT CD8 T cells from HFD-fed mice led us to examine the role of negatively charged and nonpolar isolevuglandin (isoLG) adduct-containing antigen-presenting cells within AT. IsoLG-adducted protein species were significantly higher in AT macrophages of HFD-fed mice; isoLGs were elevated in M2-polarized macrophages, promoting CD8 T-cell activation. Our findings demonstrate that clonal TCR expansion that favors positively charged CDR3s accompanies HFD-induced obesity, which may be an antigen-driven response to isoLG accumulation in macrophages.
© 2018 by the American Diabetes Association.
0 Communities
1 Members
0 Resources
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
1 Members
0 Resources
7 MeSH Terms
Integration Mapping of piggyBac-Mediated CD19 Chimeric Antigen Receptor T Cells Analyzed by Novel Tagmentation-Assisted PCR.
Hamada M, Nishio N, Okuno Y, Suzuki S, Kawashima N, Muramatsu H, Tsubota S, Wilson MH, Morita D, Kataoka S, Ichikawa D, Murakami N, Taniguchi R, Suzuki K, Kojima D, Sekiya Y, Nishikawa E, Narita A, Hama A, Kojima S, Nakazawa Y, Takahashi Y
(2018) EBioMedicine 34: 18-26
MeSH Terms: DNA Transposable Elements, High-Throughput Nucleotide Sequencing, Humans, Lentivirus, Polymerase Chain Reaction, Receptors, Antigen, T-Cell, Retroviridae, T-Lymphocytes
Show Abstract · Added December 13, 2018
Insertional mutagenesis is an important risk with all genetically modified cell therapies, including chimeric antigen receptor (CAR)-T cell therapy used for hematological malignancies. Here we describe a new tagmentation-assisted PCR (tag-PCR) system that can determine the integration sites of transgenes without using restriction enzyme digestion (which can potentially bias the detection) and allows library preparation in fewer steps than with other methods. Using this system, we compared the integration sites of CD19-specific CAR genes in final T cell products generated by retrovirus-based and lentivirus-based gene transfer and by the piggyBac transposon system. The piggyBac system demonstrated lower preference than the retroviral system for integration near transcriptional start sites and CpG islands and higher preference than the lentiviral system for integration into genomic safe harbors. Integration into or near proto-oncogenes was similar in all three systems. Tag-PCR mapping is a useful technique for assessing the risk of insertional mutagenesis.
Copyright © 2018 The Authors. Published by Elsevier B.V. All rights reserved.
0 Communities
1 Members
0 Resources
MeSH Terms
Consider Changing the Horse for Your CAR-T?
Wilson MH
(2018) Mol Ther 26: 1873-1874
MeSH Terms: Animals, Antigens, CD19, Heterografts, Horses, Immunoglobulin G, Immunotherapy, Adoptive, T-Lymphocytes
Added December 13, 2018
0 Communities
1 Members
0 Resources
7 MeSH Terms
Inhibition of Epidermal Growth Factor Receptor Activation Is Associated With Improved Diabetic Nephropathy and Insulin Resistance in Type 2 Diabetes.
Li Z, Li Y, Overstreet JM, Chung S, Niu A, Fan X, Wang S, Wang Y, Zhang MZ, Harris RC
(2018) Diabetes 67: 1847-1857
MeSH Terms: Albuminuria, Animals, Biomarkers, Crosses, Genetic, Cytokines, Diabetes Mellitus, Type 2, Diabetic Nephropathies, ErbB Receptors, Erlotinib Hydrochloride, Fibrosis, Glomerulonephritis, Hypoglycemic Agents, Insulin Resistance, Kidney, Macrophages, Membrane Transport Modulators, Mice, Knockout, Mice, Mutant Strains, Nitric Oxide Synthase Type III, Oxidative Stress, Protein Kinase Inhibitors, T-Lymphocytes, Transforming Growth Factor alpha
Show Abstract · Added November 9, 2018
Previous studies by us and others have indicated that renal epidermal growth factor receptors (EGFR) are activated in models of diabetic nephropathy (DN) and that inhibition of EGFR activity protects against progressive DN in type 1 diabetes. In this study we examined whether inhibition of EGFR activation would affect the development of DN in a mouse model of accelerated type 2 diabetes (BKS with endothelial nitric oxide knockout [eNOS]). eNOS mice received vehicle or erlotinib, an inhibitor of EGFR tyrosine kinase activity, beginning at 8 weeks of age and were sacrificed at 20 weeks of age. In addition, genetic models inhibiting EGFR activity () and transforming growth factor-α () were studied in this model of DN in type 2 diabetes. Compared with vehicle-treated mice, erlotinib-treated animals had less albuminuria and glomerulosclerosis, less podocyte loss, and smaller amounts of renal profibrotic and fibrotic components. Erlotinib treatment decreased renal oxidative stress, macrophage and T-lymphocyte infiltration, and the production of proinflammatory cytokines. Erlotinib treatment also preserved pancreas function, and these mice had higher blood insulin levels at 20 weeks, decreased basal blood glucose levels, increased glucose tolerance and insulin sensitivity, and increased blood levels of adiponectin compared with vehicle-treated mice. Similar to the aforementioned results, both and diabetic mice also had attenuated DN, preserved pancreas function, and decreased basal blood glucose levels. In this mouse model of accelerated DN, inhibition of EGFR signaling led to increased longevity.
© 2018 by the American Diabetes Association.
1 Communities
0 Members
0 Resources
23 MeSH Terms
Supplementation of p40, a Lactobacillus rhamnosus GG-derived protein, in early life promotes epidermal growth factor receptor-dependent intestinal development and long-term health outcomes.
Shen X, Liu L, Peek RM, Acra SA, Moore DJ, Wilson KT, He F, Polk DB, Yan F
(2018) Mucosal Immunol 11: 1316-1328
MeSH Terms: Animals, Bacterial Proteins, Cell Differentiation, Cell Proliferation, Epithelial Cells, ErbB Receptors, Female, Hydrogels, Immunity, Innate, Immunoglobulin A, Intestinal Mucosa, Lactobacillus rhamnosus, Mice, Mice, Inbred C57BL, Probiotics, T-Lymphocytes, Regulatory, Tight Junctions, Time, Transcriptional Activation
Show Abstract · Added June 8, 2018
The beneficial effects of the gut microbiota on growth in early life are well known. However, knowledge about the mechanisms underlying regulating intestinal development by the microbiota is limited. p40, a Lactobacillus rhamnosus GG-derived protein, transactivates epidermal growth factor receptor (EGFR) in intestinal epithelial cells for protecting the intestinal epithelium against injury and inflammation. Here, we developed p40-containing pectin/zein hydrogels for targeted delivery of p40 to the small intestine and the colon. Treatment with p40-containing hydrogels from postnatal day 2 to 21 significantly enhanced bodyweight gain prior to weaning and functional maturation of the intestine, including intestinal epithelial cell proliferation, differentiation, and tight junction formation, and IgA production in early life in wild-type mice. These p40-induced effects were abolished in mice with specific deletion of EGFR in intestinal epithelial cells, suggesting that transactivation of EGFR in intestinal epithelial cells may mediate p40-regulated intestinal development. Furthermore, neonatal p40 treatment reduced the susceptibility to intestinal injury and colitis and promoted protective immune responses, including IgA production and differentiation of regulatory T cells, in adult mice. These findings reveal novel roles of neonatal supplementation of probiotic-derived factors in promoting EGFR-mediated maturation of intestinal functions and innate immunity, which likely promote long-term beneficial outcomes.
0 Communities
2 Members
0 Resources
19 MeSH Terms
Transposon-modified antigen-specific T lymphocytes for sustained therapeutic protein delivery in vivo.
O'Neil RT, Saha S, Veach RA, Welch RC, Woodard LE, Rooney CM, Wilson MH
(2018) Nat Commun 9: 1325
MeSH Terms: Adoptive Transfer, Animals, Cell Engineering, Cell- and Tissue-Based Therapy, DNA Transposable Elements, Erythropoietin, Gene Expression, Genetic Vectors, Hematopoiesis, Herpesvirus 4, Human, Humans, Mice, Ovalbumin, Receptors, Antigen, T-Cell, T-Lymphocytes, Transgenes, Vaccination
Show Abstract · Added September 24, 2018
A cell therapy platform permitting long-term delivery of peptide hormones in vivo would be a significant advance for patients with hormonal deficiencies. Here we report the utility of antigen-specific T lymphocytes as a regulatable peptide delivery platform for in vivo therapy. piggyBac transposon modification of murine cells with luciferase allows us to visualize T cells after adoptive transfer. Vaccination stimulates long-term T-cell engraftment, persistence, and transgene expression enabling detection of modified cells up to 300 days after adoptive transfer. We demonstrate adoptive transfer of antigen-specific T cells expressing erythropoietin (EPO) elevating the hematocrit in mice for more than 20 weeks. We extend our observations to human T cells demonstrating inducible EPO production from Epstein-Barr virus (EBV) antigen-specific T lymphocytes. Our results reveal antigen-specific T lymphocytes to be an effective delivery platform for therapeutic molecules such as EPO in vivo, with important implications for other diseases that require peptide therapy.
0 Communities
2 Members
0 Resources
17 MeSH Terms