MODULATION OF AN ANIMAL MODEL OF HYPERTHYROIDISM

甲亢动物模型的调节

• 批准号: 6342525
• 负责人: Sandra M McLachlan
• 金额: $ 31.58万
• 依托单位: CEDARS-SINAI MEDICAL CENTER
• 依托单位国家: 美国
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-02-15 至 2002-12-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6342525
• 关键词: Graves disease; T lymphocyte; antibody specificity; autoantibody; disease /disorder model; enzyme linked immunosorbent assay; fibroblasts; flow cytometry; gender difference; hormone receptor; hyperthyroidism; iodide peroxidase; iodine; laboratory mouse; lymphocyte proliferation; pathologic process; protein structure; thyrotropin

Graves' hyperthyroidism, a very common autoimmune disorder affecting primarily women, is caused by TSH receptor (TSHR) autoantibodies that mimic the action of TSH. Very recently, the first animal model has been developed with the hallmarks of Graves' hyperthyroidism. We now propose to use this "Chiba" model to investigate several critical issues in Graves' disease, including exploration of approaches for immune intervention. 1. Addressing critical issues in Graves' disease:- The Chiba mouse model will be used to study the role of thyroid peroxidase (TPO) antibodies (common in Graves' disease), TSHR intramolecular cleavage, gender and iodide ingestion on development and course of hyperthyroidism 2. TSHR Antibody characterization:- TSHR antibodies arising in the Chiba mouse model will be characterized by approaches used for human TSHR autoantibodies, including:- (i) functional assays for TSH binding inhibition (TBI), thyroid stimulating immunoglobulin (TSI) and antibodies that block the biological action of TSH (TSBAb), (ii) epitopes and (iii) flow cytometry with intact cells to examine binding of non-functional TSHR antibodies. 3. TPO antibody characterization:- We will determine whether TPO antibodies in the Chiba model resemble human autoantibodies in terms of their:- (i) affinities, (ii) preferential recognition of native TPO and, (iii) preferential interaction with epitopes in the immunodominant region recognized by human TPO autoantibodies. 4. T Cell responses to TSHR antigen:- With the Chiba model of Graves' disease, we will:- (i) study the role of T cells in providing help in the generation of functional TSHR antibodies, (ii) determine the cytokines secreted by TSHR-specific T cells and, (iii) determine if the proliferative response of TSHR-specific T cell clones will vary depending on the antigen presenting cell (macrophages, B cells or syngeneic TSHR-expressing fibroblasts) 5. Intervention in the immune response in the Chiba model:- The Chiba model now makes feasible studies on the immunotherapy of hyperthyroidism in these animals, a long road that may ultimately provide the basis for immune intervention in human disease. We propose to examine the effect of second signal blockade (anti-CD40L) as a means to:- (i) Prevent the induction of disease and reverse the course of established disease and, (ii) Target a specific antigen (TSHR), rather than employing blanket suppression of the immune response.

格雷夫斯甲状腺功能亢进症，一种非常常见的自身免疫性疾病， 主要是女性，是由促甲状腺激素受体（TSHR）自身抗体引起的， 模仿TSH的作用。 最近，第一个动物模型 出现了格雷夫斯甲状腺功能亢进的症状 我们现建议 使用“千叶”模型来研究 Graves病，包括免疫治疗方法的探索 干预1.格雷夫斯病的关键问题： 将千叶小鼠模型用于研究甲状腺过氧化物酶的作用 (TPO)抗体（常见于Graves病）、TSHR分子内 卵裂、性别和碘摄入对发育和病程的影响 甲状腺机能亢进症2. TSHR抗体表征：- TSHR抗体 在千叶小鼠模型中产生的，将通过以下方法来表征 用于人TSHR自身抗体，包括：-（i）功能测定 对于TSH结合抑制（TBI），甲状腺刺激免疫球蛋白 (TSI)以及阻断TSH的生物作用的抗体（TSBAb）， (ii)表位和（iii）用完整细胞进行流式细胞术检查 非功能性TSHR抗体的结合。 3. TPO抗体 表征：-我们将确定是否TPO抗体在千叶 模型在以下方面类似于人自身抗体：-（i）亲和力， (ii)优先承认天然TPO，和（iii）优先 与免疫显性区域中的表位相互作用， 人TPO自身抗体。 4. T细胞对TSHR抗原的应答： 千叶Graves病模型，我们将：（i）研究T 细胞在产生功能性TSHR抗体中提供帮助， (ii)确定由TSHR特异性T细胞分泌的细胞因子， (iii)确定TSHR特异性T细胞的增殖反应是否 克隆将根据抗原呈递细胞（巨噬细胞， B细胞或表达TSHR的同源成纤维细胞）5. 干预 千叶模型中的免疫反应：-千叶模型现在使 甲状腺功能亢进症的免疫治疗的可行性研究， 动物，一个漫长的道路，最终可能提供免疫的基础， 干预人类疾病。 我们建议研究 第二信号阻断剂（抗CD 40 L）作为一种手段，以： 诱发疾病并逆转已建立的疾病的进程， (ii)靶向特定抗原（TSHR），而不是使用毯子 抑制免疫反应。