Matrix Metalloproteinase Regulation of Leukocyte Infiltration during Wound Repair

伤口修复过程中基质金属蛋白酶对白细胞浸润的调节

• 批准号: 8534852
• 负责人: LISA Joy MCCAWLEY
• 金额: $ 29.06万
• 依托单位: VANDERBILT UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-30 至 2015-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8534852
• 关键词: Ablation; Adherence; Adhesions; Affect; Animals; Biological Assay; Biological Models; Bioreactors; Blood capillaries; Cell Line; Cell physiology; Chemotaxis; Clinical; Connective Tissue; Cytoskeleton; Endothelial Cells; Endothelium; Environment; Epidermis; Extravasation; Family; Family member; Fibroblasts; Genes; Goals; Growth Factor; Healed; Health; Host Defense; Hydrolysis; Immune; In Vitro; Individual; Infiltration; Inflammation; Leukocytes; MMP3 gene; MMP9 gene; MMPI; Maintenance; Matrix Metalloproteinase Inhibitor; Matrix Metalloproteinases; Microfluidics; Modeling; Mus; Optics; Pattern; Peptide Hydrolases; Play; Population; Process; Regulation; Role; Site; Skin; Squamous cell carcinoma; Staging; System; Testing; Tissues; Transgenic Mice; Water; Wound Healing; adhesion receptor; base; capillary; cell type; defense response; design; fibrogenesis; healing; in vivo; in vivo Model; insight; keratinocyte; macrophage; member; migration; monocyte; monolayer; mouse model; neovascularization; neutrophil; novel; overexpression; prevent; public health relevance; response; tumor progression; wound

DESCRIPTION (provided by applicant): Upon loss of existing tissue integrity, wound closure is critical for maintenance of the protective epidermal barrier that shields the host from environmental insult and prevents water loss. An essential, initial response during wound repair is the influx of circulating leukocytes that cleanse the wound and also provide activators and growth factors to stimulate fibrogenesis and neovascularization. Members of the matrix metalloproteinase (MMP) family, such as MMP3, are potential key regulators of leukocyte infiltration. MMP3 is upregulated in the epidermis during processes undergoing tissue remodeling. Mice which are null for MMP3 have delayed closure of excisional wounds and demonstrate reduced infiltration of leukocytes in a number of model systems. Furthermore, we find that MMP3-/- animals have an increased sensitivity to SCC progression that is associated with a reduction in neutrophil and macrophage infiltration evident throughout all stages of tumor progression. Based upon these observations, we propose that MMP3 regulates a protective host defense response during wound repair that is reflective of a protective, antitumorigenic response during SCC. A number of molecules known to affect immune cell function can be directly targeted for hydrolysis and release by MMP3 or matrix proteinases which are activated by MMP3. We hypothesize that MMP3, in combination with other matrix proteinases, directly enhances leukocyte extravasation that subsequently influences the wound repair process. Leukocyte infiltration into sites of inflammation requires the coordinate regulation of multiple steps including arrest on endothelium, migration through the endothelial barrier and directed migration through connective tissue towards the site of inflammation. MMP3 is expressed by a variety of cell types including keratinocytes, fibroblasts, endothelial cells and monocytes and can activate other matrix proteinase classes; thus, MMP3 and other MMPs may modulate multiple key steps required for optimal leukocyte extravasation. The goal of this project is to elucidate the functional role of MMP3 in leukocyte extravasation during wound healing. Our specific aims will test our hypothesis as follows: Specific Aim 1: To identity the cellular matrix proteinase contributions of leukocytes, fibroblasts and keratinocytes to MMP3 dependent leukocyte infiltration into the wound environment using in vivo mouse models that are null for or have targeted overexpression of individual MMP family members. Specific Aim 2. To test the hypothesis that MMP3 activity regulates activation of subsequent MMP family members in wounded epidermis. Specific Aim 3: To identity the cellular mechanisms regulated during MMP3 and matrix protease dependent transendothelial migration in vitro. These studies will provide novel insights into the role of MMP3 and other matrix proteinases during leukocyte transendothelial migration and provide an in vivo model system for testing MMP inhibitors in a clinical setting. PUBLIC HEALTH RELEVANCE: Wounding of the skin requires healing to maintain normal health. An essential part of wound healing is inflammation. Matrix Metalloproteinases such as MMP3 may play a key role in regulating inflammation during wound healing.

描述（由申请人提供）： 当现有组织完整性丧失时，伤口闭合对于维持保护性表皮屏障至关重要，该屏障可以保护宿主免受环境侵害并防止水分流失。伤口修复过程中一个重要的初始反应是循环白细胞的流入，其清洁伤口并提供激活剂和生长因子以刺激纤维发生和新血管形成。基质金属蛋白酶 (MMP) 家族的成员，例如 MMP3，是白细胞浸润的潜在关键调节因子。在组织重塑过程中，表皮中的 MMP3 上调。 MMP3 缺失的小鼠延迟了切除伤口的闭合，并且在许多模型系统中表现出白细胞浸润减少。此外，我们发现 MMP3-/- 动物对 SCC 进展的敏感性增加，这与在肿瘤进展的所有阶段中明显的中性粒细胞和巨噬细胞浸润减少有关。基于这些观察，我们提出 MMP3 在伤口修复过程中调节保护性宿主防御反应，这反映了 SCC 过程中的保护性抗肿瘤反应。许多已知影响免疫细胞功能的分子可以直接被 MMP3 或被 MMP3 激活的基质蛋白酶水解和释放。我们假设 MMP3 与其他基质蛋白酶结合，直接增强白细胞外渗，从而影响伤口修复过程。白细胞浸润到炎症部位需要多个步骤的协调调节，包括在内皮上的停滞、通过内皮屏障的迁移以及通过结缔组织向炎症部位的定向迁移。 MMP3 由多种细胞类型表达，包括角质形成细胞、成纤维细胞、内皮细胞和单核细胞，并且可以激活其他基质蛋白酶类别；因此，MMP3 和其他 MMP 可以调节最佳白细胞外渗所需的多个关键步骤。该项目的目标是阐明 MMP3 在伤口愈合过程中白细胞外渗中的功能作用。我们的具体目标将检验我们的假设如下：具体目标 1：使用体内小鼠模型来鉴定白细胞、成纤维细胞和角质形成细胞对 MMP3 依赖性白细胞浸润到伤口环境中的贡献，这些模型对于 MMP3 无效或有针对性的过表达个人 MMP 家庭成员。具体目标 2. 检验 MMP3 活性调节受伤表皮中后续 MMP 家族成员激活的假设。具体目标 3：确定 MMP3 和基质蛋白酶依赖性跨内皮迁移过程中受体外调节的细胞机制。这些研究将为 MMP3 和其他基质蛋白酶在白细胞跨内皮迁移过程中的作用提供新的见解，并为在临床环境中测试 MMP 抑制剂提供体内模型系统。 公共卫生相关性： 皮肤受伤需要愈合才能维持正常健康。伤口愈合的一个重要部分是炎症。基质金属蛋白酶（例如 MMP3）可能在伤口愈合过程中调节炎症中发挥关键作用。