A Murine Model for Inhibition of Farnesyltransferase

描述（由申请人提供）：炎症已被认为是动脉粥样硬化发展的所有阶段的关键组成部分。多种炎症细胞因子，包括MCP-1、M-CSF、IL-6、IL-10、IFN-y、TGF-P1，由血管和循环血细胞分泌，已被证明在动脉粥样硬化病变的形成和进展中发挥作用。最近的数据表明，HMG-CoA还原酶抑制剂（他汀类药物）对动脉粥样硬化患者的一些有益影响可能部分是通过直接影响一种或多种这些细胞因子的表达而介导的，独立于其对胆固醇降低的全身作用。具体来说，这些药物对减少中风的作用是这些药物存在临床相关的胆固醇非依赖性作用的最佳证据。我们的初步数据表明，他汀类药物可调节人血管平滑肌细胞（HVSMC）和巨噬细胞（动脉粥样硬化斑块的常见细胞成分）中TGF-P1 （aTGF-pl）的活性表达。我们的研究结果得到了其他研究小组的证实，表明他汀类药物可以直接调节血管壁内细胞中各种细胞因子的表达。为了分析他汀类药物对血管壁内细胞的直接作用，而不依赖于其对胆固醇代谢的系统性影响，我们提出了在动脉粥样硬化斑块中活化的巨噬细胞中靶向表达显性负突变法尼基转移酶蛋白的转基因动物。我们假设他汀类药物在减少脑血管事件方面的部分多效性益处可能是通过其局部调节各种细胞因子表达的作用而介导的，而不依赖于任何对胆固醇降低的全身作用。

DESCRIPTION (provided by applicant): Inflammation has been recognized as a key component of atherosclerotic at all stages of its development. Multiple inflammatory cytokines, including MCP-1, M-CSF, IL-6, IL-10, IFN-y, TGF-P1 secreted by vascular and circulating blood cells, have been shown to have a role in both atherosclerotic lesion formation and progression. Recent data suggest that some of the beneficial affects of HMG-CoA reductase inhibitors (statins) in patients with atherosclerosis may in part be mediated through a direct effect on expression of one or more of these cytokines, independent of its systemic effect on cholesterol reduction. Specifically the effect of these agents on reduction of stroke are the best available evidence fro the presence of clinically relevant cholesterol-independent effects of these drugs. Our preliminary data suggest that statins modulate active TGF-P1 (aTGF-pl) expression in both human vascular smooth muscle cells (HVSMC) and macrophages, the common cellular constituent of atherosclerotic plaque. Our results are corroborated by other groups demonstrating an effect of statins on modulating expression of various cytokines directly on the cells within the vessel wall. To dissect out the role of statins on the cells within the vessel wall directly, independent of its systemic effects on cholesterol metabolism, we propose generation of transgenic animals with targeted expression of a dominant negative mutated farnesyltransferase protein locally within the activated macrophages in the atherosclerotic plaque. We postulate that part of the pleiotropic benefit of statins specifically in reduction of cerebrovascular events may be mediated through its effect on modulating expression of various cytokines locally independent of any systemic effects on cholesterol reduction.