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心外膜脂肪组织:从解剖生理、临床评估到心血管疾病的干预靶点

赵松 张毅

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引用格式: 赵松,张毅. 心外膜脂肪组织:从解剖生理、临床评估到心血管疾病的干预靶点[J/OL]. 中华心血管病杂志(网络版),2022,5:e1000111(2022‑05‑27). http://www.cvjc.org.cn/index.php/Column/columncon/article_id/289. DOI:10.3760/cma.j.cn116031.2022.1000111.

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发布日期: 2022/05/27    浏览量: 3695 次

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心外膜脂肪组织:从解剖生理、临床评估到心血管疾病的干预靶点
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心外膜脂肪组织:从解剖生理、临床评估到心血管疾病的干预靶点
04:57

引言


心血管疾病(cardiovascular diseases,CVD)是全球人类的主要死因之一[1]。据推算,我国CVD现有患病人数为3.3亿,给我国带来了严重的社会和经济负担[2]。心外膜脂肪组织(epicardial adipose tissue,EAT)是位于心肌表面和心外膜内脏层之间的独特的脂肪库[3]。EAT的独特性主要体现在两个方面,一是其独特的解剖结构,EAT和心脏无障碍紧密相连[4];二是EAT拥有不同于其他内脏脂肪组织和皮下脂肪组织的信号转录系统[5]。自EAT有报道以来,EAT与CVD的相关研究引起了广泛的关注。由于其接近心脏,EAT被认为在CVD的发生和发展中发挥作用,特别是在冠状动脉疾病(coronary artery disease,CAD)、心房颤动和心力衰竭中。随着一些心血管药物被发现对EAT产生影响,EAT也被认为是CVD的潜在的治疗靶点[6]。

心外膜脂肪组织的解剖特点


EAT指心肌和心外膜内脏层(心包内脏层)之间的脂肪组织(图1),覆盖了心脏表面80%的区域,由冠状动脉的分支供血[7]。EAT在心肌表面分布不均匀,主要位于房室沟和室间沟,分为冠状动脉周围EAT和心肌EAT[8]。EAT主要由脂肪细胞组成,也包含神经细胞、炎症细胞(主要是巨噬细胞和肥大细胞)、基质细胞、内皮细胞和免疫细胞[4]。EAT是一种白色脂肪,但有类似棕色脂肪和米色脂肪的特征[9]。EAT和心肌之间不存在肌筋膜,因此和心肌有相同的微循环,并且这一特点仅在EAT与心肌之间存在,在其他内脏脂肪组织中未曾见到[4]。

心外膜脂肪组织的生理和病理


在正常生理情况下,EAT对心脏有保护作用。EAT能缓冲游离脂肪酸对邻近心肌的损害,保护心脏免受高浓度脂肪酸的伤害[10]。然而,与无代谢综合征的人相比,代谢综合征患者的EAT的脂肪酸结合蛋白‑4分泌明显增加,使游离脂肪酸向心肌细胞内的转运增多[11]。EAT基因转录组中富含编码心脏保护性脂肪因子的基因,具有潜在的抗炎和抗动脉粥样硬化特性[12]。EAT可以释放多种炎症因子,并通过旁分泌的形式作用于心脏及冠状动脉[13]。EAT被认为在缺血或缺氧情况下为心肌提供直接热源,并保护心肌[14]。EAT中控制产热的过程相当复杂,目前其机制还未完全清晰。在新生儿中,EAT具有类似棕色脂肪的特性和功能[14],随着年龄的增长,EAT的功能从产热转变为储能,并且棕色脂肪样的活动明显减少[14],表明从棕色脂肪到米色脂肪的转
变是成人EAT的特点[14]。在高血压、肥胖、代谢综合征和糖尿病等炎症参与的代谢性疾病中,EAT成为脂肪发生紊乱的场所之一,此时EAT的棕色脂肪样的活动减少,影像学上表现为EAT的体积增加和(或)密度的改变,并分泌促炎因子对心脏产生不利影响[15]。另一方面,在慢性和长期的缺血状态下,与脂肪细胞褐变和产热激活相关的蛋白质的基因表达在 EAT 中下调,促炎细胞因子的基因表达增加[14]。值得关注的是,EAT可以被诱导恢复其棕色脂肪样功能,并对长期缺血患者的心脏产生有益影响[16]。

心外膜脂肪组织的影像学评估


EAT可以用多种影像学技术进行评估,我们将临床上常用的评估EAT的技术进行了优缺点总结(表1)。心脏超声是比较早期用于评估EAT的检查。EAT的厚度可以通过标准二维超声心动图进行测量。在心脏超声上,EAT指心肌外壁和心包内脏层之间的无回声空间,但当出现炎症或大量EAT时,EAT也可能出现回声密集的空间[17]。使用心脏超声测量EAT的优势主要体现在成本低、易获取和多次重复测量。但心脏超声是一项十分依赖于操作者熟练度的检测手段,对操作者有较高要求,且无法对局部的EAT和EAT的体积进行评估。心脏CT和MRI可以检测心脏超声无法检测到的深部区域的EAT,从而计算EAT的体积和评估EAT密度[18‑19]。由于CT的高分辨率、测量可完全覆盖心脏以及可同时评估冠状动脉,所以CT测量EAT成为当下研究使用最多的方法[20]。CT主要的缺点是不易获取,费用较心脏超声高,且有电离辐射。MRI虽然被认为是脂肪组织成像的“金标准”,但部分图像上EAT与心包脂肪组织分界欠清,相对CT来说检查时间更长、更昂贵、更不易获得且不适用于有金属植入的患者。尽管正电子发射计算机体层显像(positron emission tomography and computed tomography,PET/CT)可以检测EAT炎症活动,但囿于其费用高昂,难以广泛运用[21]。CT脂肪衰减指数(fat attenuation index,FAI)已被提出作为血管周围脂肪炎症的标志物[21],但FAI同样具有CT测量的缺点,且FAI对局部EAT的测量有待进一步的研究。人工智能结合影像组学也是未来评估EAT发展的方向[22‑23]。

心外膜脂肪组织和冠状动脉疾病的关系


CAD的发病受多种因素的影响,其中炎症已被明确在动脉粥样硬化过程中扮演着关键的角色[24]。尽管EAT参与冠状动脉粥样硬化形成的机制很复杂,但炎症是CAD患者EAT的主要特征[25]。在CAD患者中,EAT分泌的脂联素减少,而瘦素水平升高[26‑27],从而增加炎症和氧化应激,进一步加速动脉粥样硬化[28]。研究表明,无论血浆炎症生物标志物的水平如何,EAT促进炎症的特征均可在CAD患者中观察到[29]。


一、心外膜脂肪组织与冠状动脉钙化
与非糖尿病人群相比,糖尿病患者CT评估的EAT体积较高,并且与冠状动脉钙化评分成正相关[30]。Framingham心脏研究队列中,调整传统的心血管危险因素后,EAT和冠状动脉钙化之间仍有显著的相关性[31]。随后的队列研究再次证实了EAT与冠状动脉钙化的关联[32]。该研究纳入了3 367例(平均年龄53岁,53%为女性)无CAD的人群并随访5年,结果显示EAT与冠状动脉钙化的进展相关,特别是在年龄小于55岁、冠状动脉钙化评分为0~100分和体重指数小于25 kg/m2的人群中[32]。同样,在一项针对可疑CAD患者的研究中发现,EAT与体重指数较低(小于27 kg/m2)的患者的冠状动脉钙化严重程度成正相关,在体重指数较高的患者中无相关性[33]。另一项重度主动脉瓣狭窄患者的研究则显示EAT与冠状动脉钙化的性别差异[34],该研究发现男性中EAT与高冠状动脉钙化评分独立相关,而在女性中未发现这种相关性[34]。与该研究相反,在573名健康绝经后女性的研究中则发现,女性冠状动脉周围EAT越厚,冠状动脉钙化评分越高[35]。以上研究提示,EAT与冠状动脉钙化之间存在关联,但这种关联可能受到肥胖和性别等因素的影响。


二、心外膜脂肪组织与冠状动脉疾病严重程度
除了冠状动脉钙化,EAT也与冠状动脉狭窄的严重程度独立关联。研究显示,冠状动脉周围EAT的密度随着CT评估的冠状动脉管腔内狭窄严重程度的增加而增加[36]。通过血管内超声成像进一步对冠状动脉内斑块进行评估的研究显示,在CAD患者中,EAT体积越大,斑块的负荷越重[37]。随后,有研究在6~24个月内对EAT通过CT进行两次评估,将517例非肥胖的CAD患者分为EAT增加组、EAT减少组及EAT保持组,中位随访时间4.4年,结果发现EAT增加组具有高风险特征斑块的发生率显著高于EAT减少组和EAT保持组[38]。除了常用于评估的CT之外,另一项纳入32例男性稳定型心绞痛患者的研究则证实了MRI评估EAT也有助于早期非钙化不稳定斑块的识别[39]。另一方面,除了与高危斑块关联,EAT也与CAD病变血管数目及更为严重的CAD相关[40‑41]。


三、心外膜脂肪组织与冠状动脉疾病事件
EAT不仅与冠状动脉钙化及CAD严重程度相关,队列研究中发现评估EAT可独立预测CAD事件的发生。病例对照研究中发现,EAT体积与主要心血管不良事件发生率之间独立相关[42]。一项纳入了4 093名无CVD的参与者(平均年龄59.4岁,53%为女性)平均随访8年的前瞻性队列研究发现,EAT体积每增加2倍,致命或非致命性冠状动脉事件的发生率增加1.5倍[43]。除了EAT的体积改变,FAI评估的EAT的炎症水平也可独立预测不良事件[44]。一项研究纳入了1 872例无先天性心脏病的患者(中位年龄62岁,37%为女性),中位随访72个月,结果发现右冠状动脉近端和左前降支动脉周围FAI都可以独立预测全因死亡和心血管死亡,并在验证队列中得到了一致的结果[44]。

因此,EAT评估有助于评判断脉粥样硬化斑块风险,以及预测主要冠状动脉事件的风险。除此之外,在无明显冠状动脉狭窄的CAD患者中,也有报道EAT与冠状动脉血流储备减少[45]、冠状动脉痉挛[46]和冠状动脉微循环障碍有关[47]。

心外膜脂肪组织和心房颤动的关系


心房颤动会增加心力衰竭、卒中和死亡的风险[48]。肥胖是心房颤动明确的危险因素,减肥和改变生活方式可以降低心房颤动发病的风险[48]。EAT的厚度与体积均与肥胖严重程度相关[49]。在肥胖症患者中,EAT失去其对心脏的保护特性,成为具有促炎特性的组织[15]。但无论体重指数如何,都可观察到EAT炎症水平在心房颤动的患者中升高[50]。推测EAT可以通过释放细胞因子、脂肪因子和改变脂肪细胞的渗透性影响心脏电生理特征和离子电流,从而导致心脏的异常电活动[51]。EAT与心房颤动的发生率、持续性和心房颤动导管消融术后的复发有关联。在Framingham心脏研究队列中,在调整了其他风险因素后,EAT体积每增加一个标准差,心房颤动的发生率增加近40%[52]。慢性和持续性心房颤动患者的EAT厚度和体积比阵发性心房颤动或窦性心律患者大,并且与肥胖、年龄、性别、CAD、糖尿病、血脂异常或高血压无关[53]。有研究使用EAT测量来预测阵发性或持续性心房颤动导管消融后的心房颤动复发,EAT体积较大的患者消融后预后较差,心房颤动复发早[54]。在纳入102例首次进行心房颤动消融术患者的研究中,通过MRI测量的EAT体积独立于体重指数,与心房颤动消融术后的复发有关[55]。结合影像组学的左心房周围EAT体积和影像特征也对预测心房颤动消融术后复发有指导价值[56]。然而,一项采取倾向性评分控制混杂因素的回顾性研究发现,心房颤动消融术后复发的独立预测因子是EAT的密度,而不是EAT的体积[57]。这可能预示着EAT的功能改变与心房颤动的关系更密切。以上研究说明,EAT与心房颤动关系密切,为心房颤动的干预和预防消融术后心房颤动的复发提供了新思路。

心外膜脂肪组织和心力衰竭的关系


心力衰竭是一种复杂的临床常见疾病,主要表现为心脏收缩或舒张功能障碍。心力衰竭患者生活质量较差,死亡风险显著增加[58]。EAT被认为在心力衰竭中有一定作用,特别是在射血分数保留的心力衰竭(heart failure with preserved ejection fraction,HFpEF)中。HFpEF肥胖患者EAT厚度比HFpEF非肥胖患者高出20%,比无心力衰竭的非肥胖人群高50%[59]。EAT厚度的增加可能导致氧消耗增加、氧利用受损以及对脂肪酸氧化的依赖性增加,导致HFpEF患者的心脏供氧能力减弱[59]。但上述研究没有考虑肥胖等混杂因素。进一步的研究显示,尽管体重指数相似,HFpEF和射血分数中间值的心力衰竭(heart failure with mid‑range ejection fraction,HFmrEF)患者(射血分数>40%)的总EAT体积和心室EAT体积均显著高于无心力衰竭的患者[60],该研究说明了EAT独立于体重指数,与HFpEF和HFmrEF相关。然而,EAT可能在射血分数降低的心力衰竭(heart failure with reduced ejection fraction,HFrEF)患者中表现为增加、不变或者减少[61‑62]。最近的一项荟萃分析则发现,EAT与无心力衰竭的患者相比,HFrEF患者的EAT较少,而HFpEF及HFmrEF患者的EAT较多[63]。更重要的是,EAT对HFpEF、HFrEF及HFmrEF患者发生不良事件的影响仍然存在差别。一项纳入了188例HFpEF患者(中位年龄73岁,52%为女性)及205例HFrEF患者(中位年龄55岁,35%为女性)中位随访21个月的研究发现,HFpEF患者EAT的厚度增加(>5 mm)与心力衰竭住院和心血管死亡的复合事件发生率增加显著相关,在HFrEF患者中EAT增加却是保护因素[64]。另一项纳入155例HFmrEF患者(平均年龄72岁,50%为女性),中位随访24个月的研究显示,EAT体积增大预示着预后不良[65]。尽管EAT与不同类型心力衰竭之间的关联存在差异,但最近一项纳入12个研究、1 983例心力衰竭患者的荟萃分析显示,EAT厚度的增加与脑利钠肽和脑利钠肽前体升高有明显关联,测量EAT厚度有可能作为诊断心力衰竭和对心力衰竭进行分层的补充指标[66]。综上所述,EAT可能与HFpEF及HFmrEF的关系更加密切,与HFrEF的关联还存在争议,加之EAT的评估不如脑利钠肽等方便,因此心力衰竭患者EAT评估的临床运用还需要更多研究支持。

心外膜脂肪组织与心血管疾病的治疗


由于EAT与CVD的密切关系,EAT有望成为CVD治疗的靶点之一。目前的治疗手段都不是专门为EAT开发的,但部分药物对EAT有间接的影响,如钠‑葡萄糖协同转运蛋白‑2(sodium‑dependent glucose transporters‑2,SGLT‑2)抑制剂、胰高血糖素样肽‑1受体(glucagon‑like peptide‑1 receptor,GLP‑1R)抑制剂和二肽基肽酶‑4(dipeptidyl peptidase‑4,DPP‑4)抑制剂等药物。荟萃分析证实了SGLT‑2抑制剂可减少EAT厚度或体积[67]。GLP‑1R抑制剂和DPP‑4抑制剂也可以减少EAT的厚度和体积[68‑69]。此外,二甲双胍也可以降低EAT的体积[70]。他汀类药物已被证实可以用于治疗CVD,并能减少EAT的体积,但他汀类药物对EAT的影响弱于SGLT‑2抑制剂和GLP‑1R抑制剂[71]。由于EAT在CVD中主要表现为炎症特性,上述药物对EAT的影响可能与这些药物有部分抗炎作用有关。因此,抗炎药物如卡纳基努单抗[72]、甲氨蝶呤[73]和秋水仙碱[74]也可能对EAT有间接影响,但还未见到相关的报道。总的来说,这些药物对EAT的间接影响可能是这些药物使CVD获益的潜在因素,但目前尚未有研究报道减少EAT与CVD结局之间的关系。

小结


EAT与心肌的无障碍接触决定了EAT在CVD中扮演着重要的角色。EAT的生理作用和病理生理改变与CVD的关系是一个重要研究领域。EAT评估结果可以通过心脏超声、CT和MRI等获得,这使得EAT评估具备辅助临床诊疗策略的巨大潜能。随着SGLT‑2抑制剂等药物对EAT影响得到证实,EAT可能是解释这些药物治疗CVD获益的一个潜在因素。但我们也应该注意到,EAT的减少是否可以为CVD带来获益还需要进一步的研究。另外,促使EAT恢复对心脏的生理保护特性也是一个值得研究的方向。
  • 作者: 赵松    张毅   

  • 作者单位: 上海市第十人民医院心内科 同济大学附属第十人民医院   

  • 通信作者: 张毅,Email:yizshcn@gmail.com

  • 关键词: 心包;脂肪组织, 白色;心外膜脂肪组织

  • DOI: 10.3760/cma.j.cn116031.2022.1000111

  • 基金项目: 国家自然科学基金(82170388)

  • 利益冲突: 无

  • 收稿日期: 2022-04-05

  • 录用日期: 2022-05-12

  • 本文编辑: 史红

  • 摘要中文

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    摘要英文

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    本研究主要材料与器材

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    参考文献

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    • 点评 1
      赵松等对心外膜脂肪组织(EAT)的解剖、生理特点及在与心血管疾病的关系的研究进行了综述。该方面为目前心血管疾病的研究热点,作者进行了系统综述,总结了EAT与心血管疾病和目前流行的COVID-19的相关性,得出了EAT可能是心血管疾病治疗的潜在靶点的结论。该综述结合目前的心血管研究热点,行文流畅,文献检索全面。
      重庆医科大学附属第一医院 罗素新
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