Anti TNF-alpha approach to treat Osteogenesis Imperfecta

 描述（由申请人提供）：目前用于骨生成障碍（OI）的治疗方法集中于抑制破骨细胞驱动的骨吸收。在过去的十年中，双膦酸盐治疗改善了OI患者的生活质量。虽然这种疗法在OI中的成功已经得到了很好的证明，但双膦酸盐的一些潜在负面影响包括骨重建减少、生长板软骨吸收减少、截骨部位愈合延迟和非典型股骨骨折。我们小组和其他人最近的研究表明炎症分子在OI的病理生理学中的作用。已经证实在不同的病理条件下，某些促炎细胞因子，如TNF-α和IL-1，可以协同RANKL/RANK信号传导增强破骨细胞的分化和活性。因此，炎性细胞因子对破骨细胞生成的影响机制及其调控将是本研究的重点。我们推测TNF-α的增加是与骨质疏松相关的破骨细胞生成增强的主要分子机制.在本研究的目的1中，我们提出评估OIM小鼠骨髓和外周中OCP的频率、表型、功能特性和NF-κ B B信号传导途径谱。基于我们的初步数据，我们预期TNF-α可引发骨髓OCP对OIM小鼠中RANKL刺激的反应增加和更快。在这个目标中，我们将评估TNF-α信号对OIM小鼠破骨细胞生成增加的贡献。在目标2中，我们计划评估TNF-α拮抗剂（依那西普）治疗对生长中的OIM小鼠的骨量、骨结构参数和骨折率的影响。该项目将提供抗TNF-α作为一种治疗肿瘤的药物的临床前评价。 OI的新治疗选择。从这项研究中获得的知识将是非常宝贵的未来转化研究的发展，使用人类受试者和潜在的应用程序来治疗人类OI患者。TNF-α拮抗剂（依那西普）治疗已被FDA批准用于其他炎症性疾病，这意味着如果结果是阳性的，它可以迅速转化为临床实践。

 DESCRIPTION (provided by applicant): Current treatment approaches for osteogenesis imperfecta (OI) are focused on inhibition of osteoclast-driven bone resorption. Over the last decade, bisphosphonate therapy has improved the quality of life for OI patients. Although the success of this therapy in OI has been well documented, some of the potential negative effects of bisphosphonates include decreased bone remodeling, reduced growth plate cartilage resorption, delayed healing of osteotomy sites and atypical femoral fractures. Recent studies by our group and others have indicated a role for inflammatory molecules in the pathophysiology of OI. It has been confirmed in different pathological conditions that certain proinflammatory cytokines, such as TNF- and IL-1, may enhance osteoclast differentiation and activity in synergy with RANKL/RANK signaling. Therefore, the mechanisms and regulation of the effects of the inflammatory cytokines on osteoclastogenesis in OI will be the focus of this proposal. We hypothesize that increased TNF- is a major molecular mechanism underlying enhanced osteoclastogenesis associated with OI. In the Aim 1 of the study we propose to assess frequency, phenotype, functional properties and NF-B signaling pathway profile of OCPs in bone marrow and periphery of OIM mice. Based on our preliminary data we expect that TNF- primes myeloid OCPs for increased and more rapid response to RANKL stimulation in OIM mice. In this aim we will assess contribution of TNF- signaling to the increased osteoclastogenesis in OIM mice. In the aim 2 we plan to evaluate the effects of TNF- antagonist (etanercept) treatment on the bone mass, bone structural parameters and fracture rate in growing OIM mice. This project will provide a pre-clinical evaluation of anti- TNF- as a new therapeutic option for OI. The knowledge gained from this research will be invaluable for the development of future translational studies using human subjects and potential applications to treat human OI patients. TNF- antagonist (etanercept) treatment has been FDA approved for other inflammatory conditions, meaning that if the results are positive, it could be rapidly translated into clinical practice.