BIOLOGICAL EFFECTS OF BASIC CALCIUM PHOSPHATE CRYSTALS

碱式磷酸钙晶体的生物效应

• 批准号: 2079295
• 负责人: HERMAN S CHEUNG
• 金额: $ 23.3万
• 依托单位: MEDICAL COLLEGE OF WISCONSIN
• 依托单位国家: 美国
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-09-30 至 1999-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/2079295
• 关键词: articular cartilage; calcium phosphate; cartilage disorder; cellular pathology; chondrocytes; citrates; disease /disorder model; drug delivery systems; enzyme biosynthesis; fibroblasts; joint stiffness; laboratory mouse; laboratory rat; macrophage; metalloendopeptidases; nonhuman therapy evaluation; physical chemical interaction; prostaglandin E; skeletal disorder chemotherapy; tissue /cell culture; tumor necrosis factor alpha

DESCRIPTION: (Adapted from the Investigator's Abstract) Calcium- containing crystal-deposition diseases, which include calcium pyrophosphate dihydrate and basic calcium phosphate crystals, are a group of clinically heterogeneous arthritides which cause significant morbidity in the elderly. Intra-articular calcium-containing crystals produce the acute inflammatory episodes of pseudogout as well as the chronic degenerative arthritis associated with chondrocalcinosis and Milwaukee Shoulder Syndrome. The etiology of these diseases is unknown. As present understanding of the mechanisms of pathologic calcification is limited, no reliable method exists to prevent calcium crystals deposition or to effect resorption. The overall objective is to determine the pathogenesis of the degenerative arthropathies associated with the deposition of these crystals in articular tissues in order to develop a rational means of preventing or reversing the consequences of such deposition. This proposal focuses on the interaction between cells and calcium crystals. Specifically emphasized will be experiments to test: (1) to determine how crystals activate cellular responses; (2) to evaluate 2 potential therapeutic agents, phosphocitrate (PC) and prostaglandin (PG)El. Four hypotheses to be tested are: (1) crystals induce macrophages to synthesize and release cytokines e.g. tumor necrosis factor-a which can reinforce the action of crystals on synoviocytes and/or induce chondrocytes to secrete enzymes leading to the cartilage degeneration (paracrine pathway); (2) cell activation by crystals is due to the physical interaction of crystal surface and cell membrane; (3) crystal-induced metalloproteinase synthesis can be dissociated from mitogenesis and is the result of early cellular responses e.g. protein kinase C activation; (4) PC and PGEl are potential therapeutic agents based on knowledge of the biologic effects of calcium-containing crystals. Their effects on the early crystal-induced cellular responses will be examined. A new form of sustained release microcarriers as a delivery system for PC will be tested. Fibroblast, chondrocyte, and macrophage cultures and a Murine Progressive Ankylosis animal model will be used for the studies.

描述：(改编自《调查者摘要》)钙- 含有晶体沉积疾病，包括钙 二水焦磷酸盐和碱性磷酸钙晶体是一种 一组临床上不同类型的关节炎，导致显著的 老年人的发病率。关节内含钙晶体 产生假性痛风的急性炎性发作以及 慢性退行性关节炎与软骨钙质沉着症和 密尔沃基肩部综合症。这些疾病的病因尚不清楚。 目前对病理性钙化机制的认识 是有限的，没有可靠的方法来防止钙结晶 沉积或影响吸收。总体目标是 确定退行性关节病相关的发病机制 在关节组织中沉积这些晶体，以便 制定一种合理的方法来防止或扭转 这样的证词。 这项建议的重点是细胞和钙之间的相互作用。 水晶。将特别强调要测试的实验：(1) 确定晶体如何激活细胞反应；(2)评估2 潜在的治疗药物--磷酸柠檬酸(PC)和前列腺素 (PG)El.需要检验的四个假设是：(1)晶体诱导 巨噬细胞合成和释放细胞因子，如肿瘤坏死 能加强晶体对滑膜细胞作用的因子-a 和/或诱导软骨细胞分泌导致软骨形成的酶 退化(旁分泌途径)；(2)细胞被晶体激活 晶体表面与细胞膜的物理相互作用； 晶体诱导的金属蛋白酶的合成可以从 有丝分裂，是早期细胞反应的结果，例如蛋白质 (4)PC和PGEL是潜在的治疗药物 基于对含钙生物效应的了解 水晶。它们对晶体诱导的早期细胞反应的影响 将会被检查。一种新型缓释微载体作为一种 将测试PC的传输系统。成纤维细胞、软骨细胞和 巨噬细胞培养和小鼠进行性强直动物模型 用于研究。