Serum Preβ1-HDL was considered as a bad factor that causes atherosclerosis (AS). But we considered this observation is wrong, since conventional Preβ1-HDL isolation and characterization protocol contains major defaults. The quantification of Preβ1-HDL was solely based on ApoA-I protein portion, and neglected the lipid portion. Hence the serum ApoA-I would affect the measurement of Preβ1-HDL, and lead to misleading results..The current proposal utilized a novel MEDLiPO gel analysis system and lipid dye separation to characterize Preβ1-HDL. Preliminary results indicated that there was no Preβ1-HDL in Tangier patient’s blood and in CETP deficiency patient’s blood, and there was significant decrease of blood Preβ1-HDL level in acute cardiac infarction patient’s blood. Since there was discordance between our results and previous publications, it would be highly necessary to re-characterize the relationship and mechanism between Preβ1-HDL and atherosclerosis. We considered reverse cholesterol transport was an important step for anti-atherosclerosis. Preβ1-HDL was a key element for reverse cholesterol transport, and hence serum Preβ1-HDL was a good factor for anti-atherosclerosis. The current proposal will try to study the relationship between Preβ1-HDL and atherosclerosis, deliver a global picture from basic and clinical research, and search for new potential targets for anti-atherosclerosis.
血清前β1高密度脂蛋白(preβ1-HDL)被认为是致动脉粥样硬化(AS)的坏因子,但是我们认为这个说法是错误的,因为传统的preβ1-HDL的分离方法存在重大缺陷,检测时忽略了脂蛋白的脂质成分而采用ApoA-I作为定量标准,血浆中大量存在ApoA-I对检测结果产生了无法回避的影响,不能客观评价preβ1-HDL的生理意义。.本课题采用原创的MEDLiPO分析系统结合脂染色分离鉴定了血浆preβ1-HDL,发现Tangier病患者和 CETP 缺失的人血中均无preβ1-HDL,急性心梗患者血中preβ1-HDL显著下降。我们新方法得出的结论与过往报导不符,因此非常有必要对preβ1-HDL与AS的关系作全面再论证。我们认为胆固醇逆转运是抗AS的重要过程,preβ1-HDL是胆固醇逆转运的关键,preβ1-HDL应是抗AS的好因子。本课题从临床到基础系统论证此观点,探寻AS治疗新靶点。
血清前β1高密度脂蛋白(preβ1-HDL)一直被认为是致动脉粥样硬化(AS)的坏因子,我们认为这个说法是错误的,因为传统的preβ1-HDL的分离方法采用ApoA-I作为定量标准而不是针对脂质成分,这样就不能准确定量血浆中preβ1-HDL的真正含量,也不能正确评价preβ1-HDL的生理意义,对于寻找动脉粥样硬化突破性治疗手段是一个无法回避的障碍。.本项目利用Medlipo脂蛋白分离系统检测了多例脂代谢相关疾病的血液或其它组织液样本,发现均存在preβ1-HDL的水平异常;尤其CETP抑制剂临床试验样本,呈现显著的HDL2升高但preβ1-HDL降低,这可能是CETP抑制剂虽能升高HDL水平但不能减少斑块的重要原因。本项目还针对preβ1-HDL介导动脉粥样硬化发生的假说,在细胞水平进行了初步的机制研究,发现preβ1-HDL与胆固醇流出及逆转运密切相关,preβ1-HDL促进胆固醇流出,可能是其抗AS的重要原因。本项目的研究结果提示,preβ1-HDL水平应列为筛选AS治疗药物的评价指标之一,升高preβ1-HDL应该是筛选动脉粥样硬化治疗新药物的一个全新靶标。同时,本项目研究中建立的具有完整标准化操作规范的MEDLiPO凝胶分析系统,以脂质定量为分离基础,能够准确分离鉴定血浆preβ1-HDL水平,为今后preβ1-HDL检测推广到临床应用的转化奠定了基础。
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数据更新时间:2023-05-31
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