降低胆固醇及额外作用.ppt
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1、降低胆固醇及额外作用,LDL-C在动脉粥样硬化形成中的作用?,LDL是含载脂蛋白B的颗粒,Murphy HC et al.Biochemistry.2000;39(32):97639770.,甘油三酯和胆固醇酯组成疏水核心,Apo B,表面覆以单层磷脂和游离胆固醇,CV risk increases with increased plasma apo B lipoproteins,Blood,Apo B lipoproteinparticles,Modification,Macrophage,Monocytes bind toadhesion molecules,Tabas I et al.C
2、irculation.2007;116(16):18321844.Williams KJ,Tabas I.Arterioscler Thromb Vasc Biol.1995;15:551561.Williams KJ,Tabas I.Arterioscler Thromb Vasc Biol.2005;25:15361540.Hoshiga M et al.Circ Res.1995;77(6):11291135.Merrilees MJ,Beaumont B.J Vasc Res.1993;30(5):293302.Nakata A et al.Circulation.1996;94(11
3、):27782786.Steinberg D et al.N Engl J Med.1989;320(14):915924.,Smooth muscle,循环中Apo B 水平越低越不利于脂质沉积,Foam cell,Maladaptiveinflammatory response,大部分急性冠脉综合征的发病原因:动脉板块破裂导致血栓形成,超越降LDL-C的疗效,聚焦降胆固醇的两个作用机制:合成与吸收其他脂质参数脂蛋白残粒植物甾醇Hs-CRP,脂病(Adiposopathy):流行病学,Figure 1.Distributions of body mass index(BMI)in SHIEL
4、D and NHANES,Bays HE,Chapman RH,Grandy S.Int J Clin Pract,May 2007,61,5,737747,BMI 和 代谢性疾病的相关性NHANES 1999-2002,25-26.9,27-29.9,30-34.9,35-39.9,40,0,10,20,30,40,50,60,70,Diabetes Mellitus,Hypertension,Dyslipidemia,OVERALL,18.5,1.7,22.3,24,4.2,17.6,38.2,5.7,25.3,53.1,10.1,30.8,62.2,12.2,39.3,68,16.4,4
5、4,67.5,27.3,51.3,62.5,9,28.9,52.9,Body Mass Index(BMI),%of Patients,Lean,Normal,Overweight,Obese,Bays HE et al.Int J Clin Pract.2007;61:737-747.Bays HE.“Sick fat,metabolic disease,and atherosclerosis.Am J Med.2009;122:S26-37.,代谢综合征患者的BMI 水平NHANES 1999-2002,18.5,Body Mass Index(BMI),25-26.9,30-34.9,3
6、5-39.9,40,27-29.9,Bays HE et al.Int J Clin Pract.2007;61:737-747.Bays HE.“Sick fat,metabolic disease,and atherosclerosis.Am J Med.2009;122:S26-37.,Lean,Normal,Overweight,Obese,脂病:流行病学,为何超重患者会进展为代谢性疾病?,脂病:流行病学,并非所有超重患者患有代谢性疾病也非所有代谢性疾病患者体重超重,脂病:定义,脂病被定义为致病的脂肪组织:基因和环境易感患者因正性能量平衡和久坐的生活方式而促发解剖学上表现为脂肪细胞肥大
7、,内脏脂肪组织聚集(肥胖),脂肪组织增生超过血管的承载能力,异位脂肪(甘油三酯)沉积在外周器官如肝脏、肌肉和胰腺生理学表现为代谢和免疫功能不良,并由此导致代谢性疾病,Bays HE et al.Future Cardiology.2005;1(1):39-59,Bays HE.Expert Rev Cardiovas Ther.2005;3(3):395-404,Bays HE,et.al.Expert Rev Cardiovas Ther 2008;6:343-68,Bays H,Ballantyne C.Future Lipidology.2006;1(4):389-420,1.脂肪增殖能
8、力削弱,Bays HE et al.Future Cardiology.2005;1(1):39-59;Bays H,Ballantyne C.Future Lipidology.2006;1(4):389-420,Bays H,Ballantyne C.Future Lipidology.2006;1(4):389-420;Pausova Z.Curr Opin Nephrol Hypertens.2006;15(2):173-178;Kalant D et al.Can J Diabetes.2003;27(2):154-171,“Sick Fat”导致的后果,Bays HE.“Sick
9、fat,metabolic disease,and atherosclerosis.Am J Med.2009;122:S26-37.,脂病与治疗,Bays H,Blonde L,Rosenson R.Expert Rev Cardiovas Ther.4(6),871895(2006),http:/,Bays H,Ballantyne C.Future Lipidology.2006;1(4):389-420;Bays H et al.Expert Rev Cardiovasc Ther.2005;3(5):789-820,Bays H,Ballantyne C.Future Lipidol
10、ogy.2006;1(4):389-420,Peripheral cholesterol synthesis,Intestinal cholesterol absorption,Biliarycholesterol,Dietarycholesterol,Healthier artery with decreased plaque,Hepatic cholesterol synthesis,HDL,HDL,Liver,SRReceptor,LDL/apo BEReceptor,Bays H,Dujovne C.Expert Opin Pharmacother 2003;4:779-790.,In
11、testinal epithelial cell,Bileacid,CE,Freecholesterol,excretion,uptake,MTP,ACAT,ABC G5ABC G8,(esterification),胆固醇的来源,Decreased liver LDLreceptor activity increases circulating LDL-C,Increased liver LDLreceptor activity decreases circulating LDL-C,Luminalcholesterol,Micellarcholesterol,CM,LDL,Atherosc
12、lerotic plaque,Diseased artery with increased plaque,LDL,肠道胆固醇吸收,Bays H,Dujovne C.Expert Opin Pharmacother 2003;4:779-790.,肠上皮细胞,胆汁胆固醇,饮食胆固醇,肠腔内胆固醇,微粒化胆固醇,胆汁酸,胆固醇酯,游离胆固醇,排泄,摄取,ABCG5ABCG8,(酯化),通过淋巴系统进入肝脏,不同人群中未经治疗的胆固醇水平,Hunter-gatherer humans,平均总胆固醇,mg/dL,Adapted from OKeefe JH Jr et al.J Am Coll Car
13、diol.2004;43(11):2142-2146.,对高危患者的LDL-C 目标值更为积极,In ATP I,high-risk patients had either definite CHD or 2 other CHD risk factors.1The ATP II guidelines define high-risk patients as having either prior CHD or other atherosclerotic disease.2ATP III guidelines and the 2004 update define high-risk patien
14、ts as those with CHD or CHD risk equivalents.3,4The information above is focused only on the LDL-C goals for high-risk patients.,aFactors that place a patient at very high risk are established CVD plus any of the following:multiple major risk factors(especially diabetes);severe and poorly controlled
15、 risk factors(eg,cigarette smoking);metabolic syndrome(TG 200 mg/dL+non-HDL-C 130 mg/dL with HDL-C 40 mg/dL);and recent acute coronary syndromes.41.NCEP ATP I.Arch Intern Med.1988;148(1):3669.2.NCEP ATP II.JAMA.1993;269(23):30153023.3.NCEP ATP III.JAMA.2001;285(19):24862497.4.Grundy SM et al.Circula
16、tion.2004;110(2):227239.,As part of therapeutic lifestyle changes,including diet,ATP-recommended LDL-C treatment goals for high-risk patients have been lowered over time.,Optional goal:70 mg/dL4,1988ATP I,1993ATP II,2001ATP III,2004ATP III Update,For very high-risk patientsa,Goal:130 mg/dL1,Goal:100
17、 mg/dL2,Goal:100 mg/dL3,Goal:100 mg/dL4,NonHDL-C 作为降脂治疗的二线目标1,aFor patients with triglycerides 200 mg/dL.HDL-C=high-density lipoprotein cholesterol;LDL-C=low-density lipoprotein cholesterol;NonHDL-C=Nonhigh-density lipoprotein cholesterol;NonHDL-C=total cholesterol HDL-C.1.NCEP Expert Panel.National
18、 Institutes of Health,2002.NIH Publication 02-5215.2.Grundy SM et al.Circulation.2004;110(2):227239.3.Smith et al.Circulation.2006;113(19):23632372.,NonHDL-C 是Apo B的替代指标,NonHDL-C=Total cholesterol HDL-C Measures the cholesterol content of all Apo Bcontaining lipoproteins,which can deliver cholestero
19、l to arterial wall1May be more predictive of atherogenesis risk than LDL-C measurement alone2Tight correlation between Apo B and nonHDL-C levels(R2=0.92)in statin-treated patients2Predictive value for CHD is similar to LDL particle number3ADA/ACC recommends nonHDL-C 100 mg/dL as treatment target for
20、 highest-risk patients4,NonHDL-C=Nonhigh-density lipoprotein cholesterol.1.Chapman MJ et al.Eur Heart J Supplements.2004;6(suppl A):A43A48.2.Ballantyne CM et al.J Am Coll Cardiol.2008;52(8):626632.3.El Harchaoui K et al.J Am Coll Cardiol.2007;49(5):547553.4.Brunzell JD et al.J.Am.Coll.Cardiol.2008;5
21、1(15):15121524.,NEPTUNE II:即使已接受治疗许多高危患者仍未达到 LDL-C 治疗目标,aNot a recommended goal at time of study.NEPTUNE=NCEP Program Evaluation Project Utilizing Novel E-Technology;HTN=hypertension.Davidson MH et al.Am J Cardiol.2005;96(4):556563.,已确诊 CVD或 极高危患者达到 LDL-C 100 mg/dL目标值的比例,LDL-C 100 mg/dL,LDL-C 70 mg/
22、dLa,代谢综合征,糖尿病,高血压+HDL-C40 mg/dL,TG 200 mg/dL+HDL-C40 mg/dL,吸烟,所有极高危患者,(n=849),(n=526),(n=369),(n=254),(n=214),(n=1,082),78%82%的患者未能达标,35%46%的患者未能达标,LDL受体,Cholesterol,Acetate,HMG-CoA Reductase,LDL,他汀类:抑制胆固醇的合成,37,双重抑制,Liver,Duodenum,Jejunum,Ileum,Colon,CMApo B48,CM RemnantApo B48,VLDLApo B100,LDLApo
23、B100,(),EzetimibeInhibits Absorption,StatinInhibitsProduction,(),38,Adapted with permission from Carey MC,Duane WC.In:Arias IM et al,eds.The Liver:Biology and Pathobiology.Raven Press Ltd;1994:719766.,2000年发现了一个与Niemann Pick C1 样蛋白相关、且功能尚不明确的基因 DNA 序列分析预测其具有胆固醇转运作用 位于细胞表面的膜蛋白 与 NPC 1(已明确其具有胆固醇转运作用)具
24、有同源性 表达受胆固醇调控 甾醇敏感性蛋白 此蛋白的表达局限于小肠粘膜细胞的顶端,Niemann-Pick C1L1(NPC1L1),依折麦布:作用机理,依折麦布选择性抑制肠道胆固醇吸收 肠道向肝脏传送胆固醇 肝脏LDL受体表达 含胆固醇的致动脉粥样硬化脂蛋白颗粒依折麦布及其葡萄糖醛酸代谢产物进行肠肝循环将药物送回作用位点限制全身性的暴露,Bays H.Expert Opin Investig Drugs 2002;11:1587-1604.Catapano AL.Eur Heart J Suppl 2001;3:E6-E10.,Photo courtesy of Harry R.Davis,
25、PhD,同位素标记的依折麦布分布于小肠绒毛刷状缘,对照组(西方膳食),依折麦布 5 mg/kg/d(西方膳食),Courtesy of Harry Davis,Jr,PhD.,Lipid,依折麦布降低ApoE敲除小鼠的颈动脉粥样硬化,Stein E.Results of phase I/II clinical trials with ezetimibe,a novel selective cholesterol absorption inhibitor.Eur.Heart J.3(Suppl.E),E11E16(2001).Bays HE,Neff D,Tomassini JE,Tershak
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