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Biomaterials to study tolerance immune induction kinetics

研究耐受免疫诱导动力学的生物材料

基本信息

批准号：
10223121
负责人：
Kristy M Ainslie
金额：
$ 37.66万
依托单位：
UNIV OF NORTH CAROLINA CHAPEL HILL
依托单位国家：
美国
项目类别：
财政年份：
2018
资助国家：
美国
起止时间：
2018-08-14 至 2023-07-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10223121
关键词：
Abbreviations Acetals Acids Address Adoptive Transfer Affect Aftercare American Animal Model Anti-Inflammatory Agents Antibodies Antigen Presentation Antigen-Presenting Cells Antigens Autoimmune Autoimmune Diseases Biocompatible Materials Biological Models C57BL/6 Mouse CD80 gene Cardiotoxicity Cell Communication Cell physiology Cells Clinical Cohort Effect Communication Data Delayed Hypersensitivity Dendritic Cells Development Dexamethasone Dextrans Disease Dose Encapsulated Engineering Evaluation Experimental Autoimmune Encephalomyelitis Experimental Models FOXP3 gene Formulation Generations Glycolates Goals Hepatotoxicity Hour IL2RA gene ITGAM gene ITGAX gene Immune Immune Tolerance Immunologics Immunologist Immunosuppression In Vitro Infection Inflammation Interferon Type II Interferons Interleukin-10 Kinetics Lipopolysaccharides Major Histocompatibility Complex Malignant Neoplasms Measures Mediating Methods Modeling Molecular Sieve Chromatography Multiple Sclerosis Mus Myelin Basic Proteins Onset of illness Ovalbumin Particle Size Particulate Pathogenesis Peptides Periodicity Phagocytes Phagolysosome Phagosomes Pharmaceutical Preparations Polyesters Polymers Proteins Proteolipids Publishing Reading Regulatory T-Lymphocyte Relapse Research Research Personnel Risk Role Signal Transduction Sirolimus Spleen Splenocyte System T cell response T-Lymphocyte T-Lymphocyte Subsets Technology Time Transforming Growth Factors Vaccines Work attenuation biodegradable polymer central nervous system demyelinating disorder clinically relevant cytokine design effector T cell experimental study immunological synapse in vivo macrophage mouse model multiple sclerosis treatment nano nanoparticle oligodendrocyte-myelin glycoprotein particle response side effect

项目摘要

ABSTRACT We plan to explore the kinetics of the immune synapse, as it relates to generation of tolerance, using nano/microparticles (Ps) fabricated from the polymer acetalated dextran (Ac-DEX). Previously, we have shown attenuation of clinical score with treatment of Ac-DEX particles encapsulating myelin basic protein (MBP) and dexamethasone (DXM), using a C57Bl/6 mouse model of experimental autoimmune encephalomyelitis (EAE). We continued this research and illustrated that Ac-DEX particles encapsulating proteolipid protein (PLP) and rapamycin (Rapa) in a SJL relapse and remitting model of EAE completely reduced clinical score to baseline when given after disease onset. The degree of reduction of clinical score for both of these EAE models was greater for the Ac-DEX particles systems than observed in other published antigen-specific EAE treatments that used particle systems. Our particle system is unique because it relies on the highly tunable polymer Ac-DEX. Ac-DEX is ideal for delivery of agents to phagocytic cells because it is acid-sensitive and has significantly increased degradation in the low acid (~pH 5) of the phagosome. In addition to this it has tunable degradation rates that can range from hours to months, which is a unique range from commonly used polyesters (e.g. poly(lactic-co-glycolic acid) (PLGA)) that have degradation on the order of months. Moreover, Ac-DEX is unique from polyesters because its degradation products are pH neutral, and do not have the potential to shift the local pH or damage sensitive payloads. We have shown that Ac-DEX particles have degradation rates that affect both antibody and cellular response for traditional vaccine and hypothesize similar effects for generation of tolerance. Therefore, we hypothesize that Ac-DEX particles promote antigen specific immune tolerance by inducing Tregs and that the cyclic acetal coverage of Ac-DEX impact degradation rate and modulate the immune synapse. We have three specific aims to address this hypothesis. Aim 1 is focused on formulation of the polymer and particles. Both a MS representative antigen as well as the model antigen OVA will be encapsulated. Particle parameters like size and loading will be determined. Ac-DEX polymer with various cyclic acetal coverages will be fabricated to degrade over a broad range of times. Aim 2 focuses on in vitro and in vivo studies to understand the immune synapse and how that relates to particle degradation times. The metrics for evaluation will be generation of inducible T-regulatory cells (iTregs). Furthermore, we will optimize systems using a delayed type hypersensitivity (DTH) model of inflammation. The relationship between particle degradation and generation of tolerance will be optimized. In Aim 3, the optimized formulation will be evaluated in a model of MS and expression of Tregs, as well as other immunological characterizations will be carried out. The overall goal of this work is to evaluate the Ac- DEX particles systems as an antigen-specific treatment for MS and to understand the influence of release of tolerance agents (e.g. antigen and Rapa) on the generation of antigen specific immune tolerance.

摘要