Cytokine Driven Mechanisms of Vein Graft Failure

静脉移植失败的细胞因子驱动机制

• 批准号: 7647256
• 负责人: C KEITH OZAKI
• 金额: $ 37.87万
• 依托单位: BRIGHAM AND WOMEN'S HOSPITAL
• 依托单位国家: 美国
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-07-01 至 2011-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7647256
• 关键词: Aftercare; Anti-Inflammatory Agents; Anti-inflammatory; Antibodies; Arterial Occlusive Diseases; Arthritis; Attention; Attenuated; Autologous; Biology; Blood Vessels; Bypass; Cell Proliferation; Cells; Coronary; Cytokine Signaling; Dependovirus; Development; Disease; Down-Regulation; Environment; Enzyme Inhibition; Evidence based treatment; Failure; Future; Hand; Homologous Gene; Hour; Hyperplasia; Infiltration; Inflammation; Inflammation Mediators; Inflammatory; Inflammatory Bowel Diseases; Interleukin-1; Interleukin-10; Intervention; Knockout Mice; Knowledge; Laboratories; Leukocytes; Link; Lower Extremity; Mediating; Membrane; Methods; Mus; Myofibroblast; Natural History; Operative Surgical Procedures; Pathologic; Pathology; Pathway interactions; Patients; Poxviridae; Process; Production; Receptor Signaling; Research; Research Personnel; Research Training; Rheumatoid Arthritis; Role; Sepsis; Signal Pathway; Signal Transduction; System; TNF gene; TNF-alpha converting enzyme; Testing; Time; Translating; Tumor Necrosis Factor Receptor; Tumor Necrosis Factor-alpha; Veins; Viral; Work; base; body system; cell motility; cytokine; cytokine therapy; design; exhaust; graft failure; human MPP1 protein; human TNF protein; improved; in vivo; in vivo Model; inhibitor/antagonist; insight; knowledge base; mRNA Expression; programs; protective effect; receptor; response; skills; transcriptional coactivator p75

DESCRIPTION (provided by applicant): Surgical vein bypass grafts fail principally due to development of neointimal hyperplasia, especially in the setting of low flow within the conduit. Inflammation stands as a pathologic feature of this process. While cytokines have been implicated in vein graft failure, the initiating factors and signaling mechanisms for their expression (as well as the biologic implications of these inflammatory mediators in vein wall adaptations) remain largely unknown. Prior studies by our group directly implicate the production of both the proinflammatory cytokine TNF-alpha and anti-inflammatory cytokine IL-10 in modulation of arterial wall adaptations to changes in wall shear. In recent work we demonstrated specific time and flow dependent cytokine signatures in the early arterialized vein graft. TNF-alpha expression is induced almost 200-fold within 24 hours in low flow grafts that subsequently develop robust intimal hyperplasia, while high flow promotes a delayed induction of IL-10 mRNA expression, which appears to protect against occlusive adaptations. This proposal moves forward by testing two linked mechanistic hypotheses: 1) Vein grafts develop neointimal hyperplasia by way of low wall shear induced pro-inflammatory cytokine driven mechanisms (soluble TNF-alpha signaling via the p55 receptor, leading to enhanced leukocyte mediated inflammation, and increased cell proliferation). Signaling pathways will be dissected by studying vein grafts in mice lacking soluble TNF-alpha or the p55 or p75 receptor. Under differential flow environments, TNF-alpha signaling will be defined through inhibition by soluble receptors, adeno-associated virus (AAV)-delivered TNF receptor homologs, specific p55 or p75 TNF receptor antibodies, or TNF-alpha converting enzyme inhibition. 2) IL-10 production protects vein grafts from over exuberant occlusive wall adaptations via reduced inflammatory leukocyte infiltration, myofibroblast proliferation, and down-regulation of TNF-alpha production. Vein grafts from IL-10 knockout mice will be examined, as well as conduits after treatment with exogenous IL-10 (both pharmacologic and AAV vIL-10). Based on new knowledge and skills obtained during the applicant's research training, the fundamental design of this initial independent proposal is to transfer basic cytokine biology to vascular biology, and through new mechanistic insights, translate these findings into strateqies to improve vein (draft durability).

描述（由申请人提供）：