Regulation of graft versus host disease with in vivo generated regulatory T cells

利用体内生成的调节性 T 细胞调节移植物抗宿主疾病

• 批准号: 9240776
• 负责人: Mirac Nedim Ince
• 金额: --
• 依托单位: IOWA CITY VA MEDICAL CENTER
• 依托单位国家: 美国
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/9240776
• 关键词: Acute Graft Versus Host Disease; Address; Adverse effects; Affect; Antibodies; Biological Preservation; Bone Marrow; Bone Marrow Transplantation; CTLA4 gene; Carcinogens; Cell Transplantation; Cells; Clinical; Complication; Critical Pathways; Cytokine Signaling; Department of Defense; Development; Diagnosis; Disease; Elements; Endopeptidases; Engraftment; Exposure to; Generations; Genetic; Genetic Engineering; Goals; Graft-Versus-Tumor Induction; Growth; Health; Helminths; Hematologic Neoplasms; Hematopoietic Neoplasms; Hematopoietic Stem Cell Transplantation; Immune; Immune system; Immunity; Immunosuppressive Agents; Individual; Infection; Inflammatory; Inflammatory Bowel Diseases; Interleukin-10; Intestines; Knowledge; Laboratories; Lead; Leukocytes; Life; Lymphocyte; Malignant Neoplasms; Marrow; Mediating; Military Personnel; Modeling; Molecular; Multiple Sclerosis; Mus; Nematoda; Nematospiroides dubius; Oral; Organ; PI3 gene; Pathway interactions; Patients; Peripheral; Pharmaceutical Preparations; Pharmacology; Pre-Clinical Model; Prevention; Recurrence; Regulation; Regulatory Pathway; Regulatory T-Lymphocyte; Research; Resources; Risk; Role; Services; Signal Pathway; Signal Transduction; Stem cells; System; T-Lymphocyte; Testing; Therapeutic; Transforming Growth Factor beta; Transplant Recipients; Treatment Protocols; Tumor Immunity; Veterans; Virus; agent orange; base; cancer recurrence; cell type; clinical practice; conditioning; cytokine; exhaustion; experimental study; graft vs host disease; immunoregulation; improved; improved outcome; in vivo; leukemia; novel; novel strategies; novel therapeutic intervention; patient population; prevent; programs; response; small molecule; success; treatment strategy; tumor

Bone marrow transplantation (BMT) is a curative approach for treating hematological malignancies and other life-threatening disorders. Military servicemen are under risk to develop such lethal conditions as a result of exposure to carcinogens – like agent orange – during their active service. The success of BMT is limited by graft versus host disease (GVHD), a lethal inflammatory complication of BMT. GVHD is driven by donor leukocyte subsets, such as donor T lymphocytes that are important for both bone marrow engraftment and the prevention of tumor recurrence. Novel treatment strategies are needed to keep donor T lymphocytes in the graft in order to maintain donor T lymphocyte-mediated anti-tumor (graft versus tumor; GVT) immunity while suppressing the GVHD. One novel approach to this is therapeutic stimulation of the function of regulatory T cells (Tregs). Our experiments show that augmentation of intestinal immune regulation induces Tregs in vivo, resulting in the suppression of GVHD and the preservation of anti-tumor immunity. We induce intestinal immune regulation, or “conditioning,” using a completely novel approach: self-limited colonization of the gut with helminths, to stimulate T helper 2 (Th2) immune pathways. In this application, we propose to test the central hypothesis that the Th2 pathways are critical in intestinal immune conditioning, and that they lead to the generation of Tregs in vivo. We will use the murine nematode, Heligmosomoides polygyrus bakeri (Hpb) to infect mice. We will induce acute GVHD in uninfected and helminth- infected BMT recipients of MHC I/II major mismatch donors. To assess the roles of Th2 and Th2-associated pathways in regulating GVHD and the in vivo induction of Tregs, we will employ complementary genetic and pharmacological approaches. We will determine the mechanisms through which intestinal immune conditioning increases the regulatory activity of Tregs, and establish the extent to which helminth infection affects GVT immunity in mouse tumor models. Furthermore, we will deliver immune regulatory and Th2-associated cytokine, interleukin 10 microparticles into the gut of uninfected mice by oral gavage, to mimic helminth-induced intestinal immune conditioning. The findings from these studies are expected to help us achieve our long-term goals, which are to: identify the cellular and molecular immune regulatory pathways that are key to helminthic immune conditioning in preclinical models; and to apply this knowledge to veterans and other patient populations that undergo BMT. No significant side effects have been associated with helminth infection in immune suppressed patient groups, like individuals with inflammatory bowel disease or multiple sclerosis. Thus, the targeting of helminth-modulated signaling pathways – using small molecules, helminth products or possibly even intact helminths – may be a safe and potent treatment for GVHD that leaves the beneficial GVT immunity intact.

骨髓移植是治疗血液病的一种有效方法