陈皮Citri Reticulatae Pericarpium为芸香科植物橘Citrus reticulata Blanco及其栽培变种的干燥成熟果皮,味辛、苦,性温,归脾、肺经,具有理气健脾、燥湿化痰的功效,用于脾胃气滞证、呕吐、呃逆证、湿痰、寒痰咳嗽及胸痹证。其传统功用为治疗消化系统[1]和呼吸系统疾病[2]等。流行病学调查显示食物中橘类黄酮的摄入可以改善心脑血管疾病[3-4],现代药理研究也发现陈皮及其成分具有良好的改善心脑血管疾病的作用,如调血脂、抗血栓、抗动脉粥样硬化、心脑保护等,且这些作用都与陈皮及其成分的抗氧化和抗炎作用密不可分。陈皮的心脑血管保护作用已经进行较为广泛的研究,但缺乏系统总结,本文就国内外对陈皮及其成分的改善心脑血管疾病,以及抗氧化和抗炎的药理作用研究进展进行综述,从而为陈皮这一资源丰富、易于获取的常用中药的心脑血管方面的深入研究和开发利用提供参考。
1 调血脂和防治脂肪肝陈皮的调血脂和防治脂肪肝作用已有文献报道,主要通过降低肝脂或血脂水平、增加脂肪酸氧化、保护肝脏等途径实现的。
1.1 降低肝脂/血脂水平研究发现陈皮整味药材及其成分(主要为黄酮类成分)均具有降低肝脂或血脂水平的作用。陈皮提取物可改善脂代谢,降低卵巢切除大鼠的脂蛋白、碱性磷酸酶(ALP)、丙氨酸氨基转移酶(ALT)、天冬氨酸氨基转移酶(AST)、肝脂水平,抗肝脂质沉积[5]。橙皮苷可降低高血脂大鼠血清总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)水平,升高高密度脂蛋白胆固醇(HDL-C)水平[6],而其苷元橙皮素可促进载脂蛋白-A1(Apo-A1)介导的胆固醇外流,进而增加HDL-C水平[7]。多甲氧基黄酮类成分也具有该方面的作用,5-O-demethyl nobiletin能抑制清道夫受体表达,抑制佛波酯(PMA)诱导的THP1单核细胞转化为巨噬细胞,降低泡沫细胞的形成,还通过上调胆固醇调节元件结合蛋白-2(SREBP-2)和抑制二酰甘油-O-酰基转移酶同源物2(DGAT2)的表达,促进低密度脂蛋白受体(LDLR)表达,改善HepG2细胞的脂质平衡[8]。羟化多甲氧基黄酮可抑制脂肪细胞的脂滴积聚,下调过氧化物酶体增殖物激活受体γ(PPARγ)和SREBP-1c及其下游的aP2、FAS、ACC表达,激活3T3-L1脂肪细胞的腺苷酸活化蛋白激酶(AMPK)信号,降低高脂小鼠脂肪、AST、ALT、TC、三酰甘油(TG)水平[9]。川陈皮素可降低高脂饮食诱导的肥胖小鼠的体质量及血脂、白色脂肪组织及血清TG水平,改善脂联素水平和糖耐量[10-11]。
1.2 增加脂肪酸氧化橘类黄酮可通过抑制肝脂肪酸合成和增加脂肪酸氧化,防止肝脂肪变性、脂代谢紊乱[12]。橙皮素、柚皮素可促进脂肪酸氧化和三羧酸循环,降低肝内脂肪酸的量,具有强氧化剂的作用[13]。多甲氧基黄酮sudachitin,具有降低db/db小鼠TG和自由脂肪酸(FFA)水平,改善糖耐量和胰岛素抵抗作用[14]。甜橙黄酮能抑制胰岛素刺激的葡萄糖的吸收,增强脂肪酸β氧化[15]。
1.3 肝脏保护作用橘类总黄酮可降低非酒精性脂肪肝(NASH)小鼠肝TG、血清AST水平,增强肝脏抗氧化能力[16]。高胆固醇饮食中添加1.5%多甲氧基黄酮,可显著降低AST和ALP活性、血清肌酸激酶(CK)和乳酸脱氢酶(LDH)水平,可用于治疗或预防肝损伤[17]。川陈皮素也具有保肝作用[18]。
2 抗血栓陈皮提取物和橙皮苷、柚皮素及其衍生物可通过抗血小板凝聚等实现抗血栓作用。陈皮能抑制大鼠血小板聚集,降低红细胞聚集[19]。橙皮苷、橙皮素及其衍生物具有抗血小板聚集和抗凝作用[20]。橙皮苷还能体内外抑制由胶原、花生四烯酸、ADP和凝血酶诱导的大鼠血小板凝聚和延长小鼠尾静脉出血时间[21]。柚皮素-7-葡萄糖苷(樱桃苷)可抑制血小板和红细胞聚集,改善血流变[22]。
3 抗动脉粥样硬化陈皮抗动脉粥样硬化作用研究最多的是其有效成分柚皮苷和柚皮素等二氢黄酮,除此外还有多甲氧基黄酮和柑橘果胶等。
柚皮苷抗动脉粥样硬化作用主要表现在通过抑制羟甲戊二酰辅酶A还原酶(HMGCR)和酰基辅酶A胆固醇酰基转移酶(ACAT)活性来调节血脂、LDL-C、Apo-B水平和non-HDL-C的量,通过抑制血管细胞黏附分子-1(VCAM-1)、单核细胞趋化蛋白-1(MCP-1)和细胞间黏附分子-1(ICAM-1)表达,抑制巨噬细胞渗入、平滑肌细胞增殖、免疫细胞黏附、内皮功能紊乱,从而减少高脂动物血管斑块的发展[23-24]。柚皮素的体内外研究均表明其具有抗动脉粥样硬化作用,体外研究中发现柚皮素与其II相代谢产物能干扰与动脉粥样硬化相关的人巨噬细胞炎症基因的表达[25];橙皮素、柚皮素代谢产物可通过抑制动脉粥样硬化相关基因(如炎症、细胞黏附、细胞骨架组织)的表达,降低单核细胞黏附于内皮细胞上[26];柚皮素可通过促进血管平滑肌细胞(VSMCs)中血红素氧化酶-1(HO-1)的表达和活性,抑制VSMC的增殖和迁移,阻滞活性氧(ROS)的产生,从而抗动脉粥样硬化[27]。体内研究中发现柚皮素对高脂饲料喂养LDLR−/−小鼠,可减少肝巨噬细胞的渗入和炎症,减少胆固醇诱导的泡沫细胞的形成和炎症标志物的表达,从而防止动脉粥样硬化[28];柚皮素还可通过抑制c-Jun NH2端激酶而抑制高脂饮食诱导肥胖小鼠的脂肪MCP-1的量,从而抑制巨噬细胞的渗入而防止血管粥样硬化[29]。
甜橙黄酮、川陈皮素有抗血管生成作用[30],甜橙黄酮还可下调斑马鱼flt1、kdrl、hras基因表达,抑制细胞周期于G0/G1期[31]。橘皮素能通过阻滞PI3K/AKT信号通路抑制大鼠主动脉平滑肌细胞(RASMCs)的增殖和迁移,预防和治疗动脉粥样硬化等血管疾病[32]。MacKinnon等[33]研究发现柑橘果胶可抑制半乳糖凝集素-3(gal-3),减小ApoE和gal-3双敲除小鼠后期动脉粥样硬化的斑块,而降低动脉粥样硬化。
4 心肌保护作用陈皮主治胸痹证,胸痹证的疼痛部位、性质、表现及预后等均与西医的心肌缺血、心肌梗死有不同程度的吻合,因此,陈皮具有抗心肌缺血/梗死、抗心肌损伤等作用。橙皮苷、橙皮素及其衍生物可抗心肌凋亡、抑制冠脉血管增殖和迁移,在心肌损伤、心脏重构、心肌缺血、心肌梗死方面均显示良好的作用[20]。橙皮素通过降低凋亡细胞比率,caspsae-3和caspase-9活性,实现抗心肌细胞凋亡和心肌细胞损伤保护作用[34]。柚皮素可降低大鼠颈动脉气球损伤模型中新生内膜/中膜层的比例和血清8-异前列腺素F2α(8-iso-PGF2α)水平,说明柚皮素可用于心瓣血管成形术后再狭窄的预防;还可降低急性梗死大鼠由缺血-再灌注诱导的心肌损伤,而具有心肌保护作用[35]。
5 脑保护作用陈皮中的川陈皮素、橘皮素等具有大脑神经保护、大脑缺血-再灌注损伤保护和改善运动认知等作用。川陈皮素可改善老化和与年龄相关的神经退行性病变引起的学习和记忆障碍,以及氧化应激以及tau过度磷酸化[36];也可激活ERK通路及其环磷酸腺苷(cAMP)转录[37]。川陈皮素还可降低脑缺血-再灌注模型大鼠脑梗死面积,抑制脑水肿和中性粒细胞侵入缺血区域,并降低脑缺血半球凋亡脑细胞的死亡,激活环磷腺苷效应元件结合蛋白(CREB),并改善脑缺血大鼠的运动功能障碍,从而保护大脑缺血-再灌注损伤[38]。川陈皮素可通过增强多巴胺释放,改善帕金森模型小鼠的运动和认知障碍[39]。川陈皮素对局灶性脑缺血、阿尔茨海默病[40]神经具有保护作用,可以改善神经功能缺损症状,减轻脑水肿,减少脑梗死体积,其保护作用可能与激活Akt/CREB通路,上调脑源性神经营养因子(BDNF)、Bcl-2和claudin-5的表达有关[41]。川陈皮素和橘皮素[42]可通过诱导线粒体轻度去极化而保护脑神经。
6 抗炎和抗氧化作用陈皮及其成分具有广泛的治疗心血管疾病作用,包括调血脂、抗血栓、抗动脉粥样硬化、抗心肌缺血/梗死、脑保护作用等,上述作用多依赖于陈皮及其成分的抗炎和抗氧化作用。
6.1 抗炎作用陈皮发挥抗炎作用的主要有效成分是黄酮类成分,包括二氢黄酮和多甲氧基黄酮。其中二氢黄酮的抗炎作用,主要通过以下途径实现的:(1)降低脂质过氧化物,增强抗氧化应激能力;(2)抑制炎症因子表达;(3)抑制细胞黏附分子表达;(4)降低免疫细胞和炎性细胞浸润。二氢黄酮中抗炎作用研究最多的为橙皮苷、柚皮苷和芸香柚皮苷。橙皮苷、柚皮苷可降低亚硝酸盐、过氧化脂质(LPO)水平和谷胱甘肽过氧化物酶(GSH-Px)、超氧化物歧化酶(SOD)、过氧化氢酶(CAT)活性,降低血清中CAT、血清丙氨酸转氨酶(SGPT),且橙皮苷作用强于柚皮苷[43]。研究发现橙皮苷、柚皮苷和芸香柚皮苷等橘类黄酮具有降低肥胖大鼠γ干扰素(IFN-γ)水平的作用[44];通过抑制p38 MAPK信号通路降低人脐静脉内皮细胞(HUVECs)ICAM-1的表达[45];还可降低小鼠巨噬细胞NO、白细胞介素-10(IL-10)、IL-12、肿瘤坏死因子-α(TNF-α)水平[46];降低大鼠TNF-α和IL-1β水平[47]。但通过对陈皮醇提物、水提物及橙皮苷部位的研究发现陈皮提取物的抗炎活性优于橙皮苷[48]。多甲氧基黄酮也具有很强的抗炎能力。川陈皮素、橘皮素、羟基化后的5-去甲基川陈皮素和橘皮素及其代谢产物均可抑制脂多糖(LPS)诱导的RAW264.7细胞炎症以及诱导型一氧化氮合酶(iNOS)和环氧合酶-2(COX-2)基因表达[49]。3, 5, 6, 7, 8, 3′, 4′-heptameth-oxyflavone、5, 7, 3′, 4′, 5′-五甲氧基黄酮也都具有抗炎作用[50]。
6.2 抗氧化作用陈皮富含黄酮类化合物,具有很强的抗氧化活性[51]。陈皮酶水解残留物具有抗氧化作用,并与总酚、黄酮(包括柚皮苷、柚皮素、橙皮苷、新橙皮苷)等呈正相关[52]。柚皮素也具有降低小鼠脂质过氧化、增加GSH及其转移酶、还原酶和过氧化物酶,SOD及CAT的活性等强抗氧化能力[53-54]。其他研究表明柚皮苷、橙皮苷等[55-56]也具有抗氧化应激、降低脂质过氧化物水平的作用。陈皮中的多甲氧基黄酮是橘类所特有的,也具有很强的抗氧化作用。柑橘皮中的多甲氧基黄酮尤其是川陈皮素有抗亚油酸氧化,浓度依懒性地抑制脂质体过氧化和清除•OH自由基的能力,且多甲氧基黄酮的活性强于橙皮苷[57]。川陈皮素可呈浓度依赖性地增加高糖诱导的HUVEC细胞总SOD活力和NO分泌量[58]。橘皮素也能降低肾组织脂质过氧化和炎症性细胞因子、DNA损伤标志物的表达,还可改善酶和非酶抗氧化作用,使肾Nrf2/Keap表达正常化,从而下调炎症因子和蛋白的表达[59]。除了黄酮,陈皮挥发油可增强过氧化物酶、CAT、GSH、GSH-Px、SOD活性、减少脂质过氧化产物丙二醛(MDA)的量,而具有抗氧化作用[60]。
7 分析与展望陈皮中含有的丰富的黄酮类成分,而其抗心脑血管疾病的药效成分主要是黄酮,目前研究最多是橙皮苷、橙皮素、柚皮苷、柚皮素,多甲氧基黄酮也在陆续的研究中。作为橘类所特有的黄酮类成分,多甲氧基黄酮具有很强的抗炎和抗氧化作用,而炎症和氧化应激在心脑血管疾病发生发展过程中起到了很大的作用,因此多甲氧基黄酮具有很大的应用前景,值得进一步深入研究。
与名贵的治疗心脑血管中药相比,陈皮是一味常用中药,分布广泛,资源丰富,易于栽培,药用价值较高,毒副作用低,还可食用,是卫生部公布的88种药食两用中药之一,有很大的开发利用潜力,因而对其抗心脑血管功效进行深入研究有很重要的理论意义和实用价值。
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