天津中医药  2023, Vol. 40 Issue (10): 1347-1355

文章信息

高策, 胡霞敏.
GAO Ce, HU Xiamin.
中药抗抑郁症的作用机制研究进展
Research progress on the mechanism of traditional Chinese medicine against depression
天津中医药, 2023, 40(10): 1347-1355
Tianjin Journal of Traditional Chinese Medicine, 2023, 40(10): 1347-1355
http://dx.doi.org/10.11656/j.issn.1672-1519.2023.10.19

文章历史

收稿日期: 2023-06-25
中药抗抑郁症的作用机制研究进展
高策1 , 胡霞敏1,2     
1. 上海中医药大学研究生院, 上海 201203;
2. 上海健康医学院药学院, 上海 201318
摘要:抑郁症是一种严重危害人类健康的精神障碍性疾病,在中医中属于“郁证”范畴,其发病机制复杂。目前的抗抑郁药物普遍存在有效率低、成瘾性大、不良反应严重等特点,而中药因其多靶点、多途径以及整体辨证等作用特点对抑郁症的治疗效果尤为显著。基于近5年发表的中药抗抑郁相关文献,对通过多种作用机制抗抑郁的中药进行整理综述,并在前人研究的基础上提出新的机制思路,以期为中药治疗抑郁症提供依据以及研究新方向。
关键词中药    抑郁症    抗抑郁    机制    研究进展    

抑郁症(MDD),又称抑郁障碍,是一种具有高发病率、高复发率、高自杀率的精神障碍性疾病。临床表现为显著持久的情绪低落、食欲减退、兴趣缺乏、思维迟缓、对社会活动失去参与感等,严重的患者会伴随幻觉,甚至有自残、自杀的行为,严重危害人类健康[1-2]

西医认为抑郁症发病与心理、遗传、环境等多种因素有关,但其发病机制复杂,尚未有明确阐述[3]。目前研究结果显示抑郁症病理机制主要与以下方面有关:1)单胺类神经递质5-羟色胺(5-HT)、多巴胺(DA)和去甲肾上腺素(NE)等表达降低[4]。2)神经营养因子(NTF)如脑源性神经营养因子(BDNF)等含量减少导致神经可塑性及再生能力降低、神经细胞过度凋亡[5]。3)下丘脑-垂体-肾上腺(HPA)轴亢进导致糖皮质激素(GC)、促肾上腺皮质激素(ACTH)、促肾上腺皮质激素释放激素(CRH)和皮质醇(CORT)的水平升高[6]。4)炎症反应:促炎因子肿瘤坏死因子-α(TNF-α)、白细胞介素-1β(IL-1β)等水平升高和抗炎因子IL-4、IL-10等水平降低[7]。5)肠道菌群失调通过微生物-肠道-脑轴影响神经系统[8]。6)线粒体自噬异常与线粒体能量代谢障碍[9]。7)氧化应激过度损伤大脑神经元[10]。8)色氨酸、犬尿氨酸代谢异常[11]。9)谷氨酸水平升高引起神经毒性[12]。10)神经细胞过度凋亡[13]。11)突触可塑性损伤或重塑障碍[14]等有关。此外,有研究发现抑郁症的发病还与脑内脂质代谢紊乱[15]、微小核糖核酸(MicroRNA或miR)表达异常[16]等有关。但实际上,抑郁症发病往往是多途径共同诱导的,其病理机制见图 1

图 1 抑郁症的病理机制 Fig. 1 Pathological mechanism of depression

抑郁症在中医中属于“郁证”范畴,是以心情抑郁、情绪不宁、胸胁满闷、失眠等症为主要临床表现的病证。郁证发生的主要原因是五志过极以及七情内伤,素体虚弱和脏气易郁为体质原因。病位主要在肝。病机为情志内伤致气机郁滞,日久化火致肝气郁结,肝郁气滞则致血瘀,并使津行不畅停于脏腑经络形成痰;肝郁气滞犯脾肺,则脾胃升降失常、健运失司,肺宣发肃降失常,致使水谷不化成食郁,水湿津液失于运化输布而内停成湿,湿聚又成痰;健运失司致气血生化乏源,火郁伤阴耗血致心之气血不足,心失所养而神不内藏,又因精血同源,故肾精亏虚无以化髓充脑。致使脏腑功能受损、气血阴阳失调,郁证则生[17]。可见郁证是多环节、多因素共同作用、相互影响的结果。

目前治疗抑郁症主要是口服化学合成的药物,普遍存在有效率低、成瘾性大、不良反应严重、患者依从性差等问题[18]。而中医药治疗抑郁症因多靶点、多途径、多层次以及整体调节、辨证论治等特点而临床疗效显著,且毒副作用小、患者依从性好[19]。因此笔者查阅近年来研究中药抗抑郁的文献,发现多数中药抗抑郁涉及多种作用机制,刚好契合中药治疗病症的特点。故基于近五年发表的文献,对可通过多种作用机制抗抑郁的中药进行整理,并阐明郁证病机与抑郁症病理机制的联系,以期为中药治疗抑郁症提供参考,为中药抗抑郁的研究提供新思路。

1 中药活性成分抗抑郁症

中药活性成分是中药发挥疗效的基础。经整理发现中药活性成分抗抑郁的作用机制并不单一,见表 1。以下将从提高单胺类神经递质水平、提高NTF含量、抑制HPA轴亢进、抑制炎症反应、改善氧化应激、改善突触可塑性以及其他抗抑郁机制阐述中药活性成分抗抑郁症的作用机制。

表 1 中药活性成分的抗抑郁作用机制 Tab. 1 Antidepressant mechanism of active ingredients of traditional Chinese medicine
1.1 提高单胺类神经递质水平

木香烃内酯能够上调海马5-HT水平以缓解肠易激综合征小鼠的抑郁症状[20]。五味子乙素能够提高慢性不可预见性轻度应激(CUMS)抑郁大鼠海马中5-HT、NE、DA含量[21]。人参皂苷Rg1能够提高CUMS+脂多糖(LPS)致抑郁小鼠脑内DA和NE水平[22]。柴胡皂苷A能够提高CUMS抑郁大鼠脑内海马区5-HT、NE表达[23]。厚朴酚能够增加皮质酮诱导抑郁小鼠海马体中5-HT水平[24]。黄精多糖能够提高急性抑郁小鼠皮层中5-HT、DA、NE水平[25]

1.2 提高NTF含量

木香烃内酯通过上调海马BDNF,磷酸化细胞外信号调节激酶1/2(p-ERK1/2)和磷酸化环磷腺苷反应元件结合蛋白(p-CREB)的表达以缓解肠易激综合征小鼠的抑郁症状[20]。厚朴酚能够提高皮质酮诱导抑郁小鼠BDNF的mRNA含量[24]。五味子乙素可以上调CUMS抑郁大鼠海马BDNF/酪氨酸激酶B(TrkB)/环磷腺苷反应元件结合蛋白CREB信号通路,增加BDNF、TrkB、CREB的信使核糖核酸(mRNA)和蛋白相对表达量,改善海马神经元数量和形态[26]。隐丹参酮可以激活慢性不可预见性应激(CUS)抑郁小鼠的BDNF/TrkB通路,提高BDNF的蛋白和mRNA表达,升高p-ERK和p-CREB的表达水平[27],并可提高皮质酮诱导抑郁小鼠海马、前额叶皮质BDNF的表达水平[28]。人参皂苷Rg1能够促进CUMS抑郁小鼠突触后致密蛋白95(PSD-95)、活性调节细胞骨架相关蛋白(Arc)和BDNF的表达[29]。人参皂苷Rb1可下调CUMS抑郁小鼠miR-134的表达激活BDNF信号通路以提高BDNF、TrkB、CREB等蛋白表达[30],并可逆转CUMS+LPS致抑郁小鼠海马BDNF的表达减少[31]。甘草苷能够上调卒中后抑郁大鼠前额叶皮质组织BDNF的表达[32]

1.3 抑制HPA轴亢进

人参皂苷Rg1能够提高CUMS+LPS抑郁小鼠海马FK506结合蛋白51(FKBP51)表达、抑制海马糖皮质激素受体(GR)表达以抑制HPA轴的过度激活[22]。厚朴酚能够抑制皮质酮诱导抑郁小鼠HPA轴亢进[24]。隐丹参酮能够抑制皮质酮诱导抑郁小鼠HPA轴亢进,减少血清中ACTH和CORT含量[28]。人参皂苷Rb1能够降低CUMS+LPS致抑郁小鼠ACTH和CORT水平,抑制HPA轴亢进[31]

1.4 抑制炎症反应

五味子乙素能够降低CUMS抑郁大鼠海马核因子-κB(NF-κB)、IL-1β、TNF-α的表达以抑制炎症反应[21]。人参皂苷Rg1能够降低CUMS+LPS抑郁小鼠海马组织NF-κB p65蛋白表达以及前额叶皮质和血清中TNF-α水平[22],抑制CUMS抑郁小鼠海马星形胶质细胞和小胶质细胞的活化,降低海马NF-κB的表达[29]。黄精多糖能下调急性抑郁小鼠小鼠血清中TNF-α和提高IL-10水平[25]。隐丹参酮通过抑制CUS抑郁小鼠NF-κB信号通路以抑制p-NF-κB、TNF-α、IL-1β、IL-6的表达,抑制小胶质细胞的M1极化、促进M2极化[27],并能降低CUMS+LPS抑郁小鼠海马和皮质中IL-6、IL-1β、TNF-α的表达[33]。人参皂苷Rb1能够抑制CUMS+LPS致抑郁小鼠脑内及外周血中TNF-α水平[31],还通过调节慢性社交挫败应激(CSDS)抑郁小鼠去乙酰化酶1(SIRT1)-NLRP3/核转录因子E2相关因子2(Nrf2)通路以抑制炎症反应[34]。α-香附酮能够增加乳腺增生+CUMS抑郁大鼠孕酮和睾酮浓度以缓解炎症反应[35]。柴胡皂苷D通过调节LPS诱导抑郁小鼠高迁移率族蛋白B1(HMGB1)/Toll样受体4(TLR4)/NF-κB信号通路,抑制小胶质细胞活化和IL-1β、IL-6、TNF-α的释放[36]。厚朴酚可以抑制CUMS抑郁小鼠小胶质细胞M1极化,并通过Nrf2/血红素加氧酶-1(HO-1)/NLRP3信号通路促进小胶质细胞M2极化,降低NLRP3、IL-1β的表达[37]。甘草苷通过抑制CUMS抑郁小鼠NLRP3炎症小体的活化来减少中枢促炎因子的释放[38]。葛根素通过TLR4/胞浆型磷脂酶A2(cPLA2)/环氧化酶-2(COX-2)途径抑制TLR4介导的磷脂代谢紊乱和神经炎症损伤,缓解高脂肪饮食结合CUMS抑郁小鼠的抑郁症状[39]

1.5 改善氧化应激

五味子乙素能够降低CUMS抑郁大鼠海马丙二醛(MDA)的含量和提高超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GPx)的含量以抑制氧化应激[21]。人参皂苷Rb1能够提高CSDS抑郁小鼠海马体SIRT1的表达,调节Nrf2/HO-1通路,增加抗氧化酶的表达以减轻氧化应激损伤[34]。隐丹参酮能够降低CUMS+LPS抑郁小鼠MDA含量,提高SOD、过氧化氢酶(CAT)、G-Px的酶活性,从而抑制氧化应激[33]。α-香附酮能够增加乳腺增生+CUMS抑郁大鼠孕酮和睾酮浓度,缓解氧化应激损伤[35]

1.6 改善突触可塑性

人参皂苷Rb1通过下调CUMS抑郁小鼠miR-134的表达激活BDNF信号通路调节海马突触可塑性[30]。甘草苷通过上调前额叶皮质组织BDNF的表达改善神经突触可塑性[32]。α-香附酮能够通过SIRT3/ROS途径介导的NLRP3炎症小体失活,增强CUMS抑郁小鼠神经可塑性[40]。葛根素通过调节海马胰高血糖素样肽-1受体(GLP-1R)/BDNF/TrkB信号传导以改善突触可塑性[41]

1.7 其他抗抑郁机制

1)调节色氨酸及谷氨酸代谢:黄精多糖能够激活急性抑郁小鼠色氨酸羟化酶1(TPH1)、抑制色氨酸-2,3-双加氧酶(TDO)等以调节色氨酸代谢通路[25]。2)抑制神经细胞过度凋亡:甘草苷能上调卒中后抑郁大鼠前额叶皮质组织B淋巴细胞瘤-2(Bcl-2)表达,下调Bcl-2相关X蛋白(Bax)表达,抑制神经细胞凋亡[32]。3)调节线粒体功能:人参皂苷Rg1能降低慢性束缚应激(CRS)抑郁大鼠长链非编码RNA GAS5的表达以改善线粒体功能障碍[42]。4)降低谷氨酸水平:人参皂苷Rg1能够调节CUMS抑郁大鼠脑内谷氨酸含量,降低神经毒性,改善海马和前额叶皮质区的损伤[43]。5)调节肠道菌群:葛根素通过降低肠道致病菌丰度、增加有益菌丰度,缓解CUMS抑郁小鼠的抑郁症状[44]

2 中药复方抗抑郁症

中药复方是中医临床用药的主要形式。中药复方结合各单味中药之能,相互协调、共同作用以治疗病症,故其抗抑郁的作用机制是多方面的。

2.1 柴胡疏肝散

研究发现柴胡疏肝散(陈皮、柴胡、川芎、枳壳、白芍、甘草、香附)能够上调环磷酸腺苷(cAMP)/CREB/BDNF信号通路提高BDNF蛋白表达[45],调控肠道菌群以改变肠道菌群相关的粪便代谢产物[46],抑制CCAAT/增强子结合蛋白同源蛋白(CCAAT/CHOP)通路和Caspase-12介导的海马细胞凋亡,改善CUMS抑郁大鼠的抑郁症状[47]。还可调节卒中后抑郁大鼠BDNF/TrkB通路降低血清TNF-α水平和海马NF-κB表达[48]。此外还能降低肝中TDO酶表达,调控色氨酸代谢,从而抗抑郁[49]

2.2 越鞠丸

研究发现越鞠丸(香附、川芎、苍术、神曲、栀子)通过激活BDNF-TrkB通路提高LPS诱导抑郁小鼠海马BDNF和TrkB表达,并通过降低外周血清中IL-1β、TNF-α、IL-10含量以抑制炎症反应[50];通过激活环磷酸腺苷依赖蛋白激酶(PKA)-ERK-CREB信号通路,改善皮质酮诱导抑郁小鼠的海马神经元损伤,促进海马神经元细胞增殖[51]

2.3 四逆散

研究发现四逆散(枳实、柴胡、芍药、甘草)能够降低肝中TDO酶表达,调节色氨酸代谢以发挥抗抑郁作用[49]。另外还可提高CUMS抑郁大鼠海马BDNF、5-HT含量,抑制HPA轴功能亢进,增强海马神经元的再生和修复[52],抑制海马组织中NLRP3炎症小体信号通路介导的炎症反应,减轻海马神经元病理性损伤[53];通过改变肝脏中细胞色素P450(CYP450)酶活性,降低促炎因子水平,改善BDNF及其受体TrkB的水平,对利血平诱导抑郁大鼠发挥抗抑郁作用[54]

2.4 逍遥散

研究发现逍遥散(柴胡、薄荷、当归、白芍、茯苓、白术、生姜、甘草)能够降低肝中TDO酶表达,调控色氨酸代谢,发挥抗抑郁作用[49]。此外还可提高海马5-HT、NE水平,激活PI3K/Akt信号通路,抑制谷氨酸升高引起的毒性以保护神经[55],通过改善肝脏线粒体结构和能量代谢[56],改善CUMS抑郁大鼠的抑郁症状;通过抑制卵巢切除(OVX)+CUS抑郁大鼠海马小胶质细胞M1化而抑制炎症[57];通过抑制促炎因子分泌,阻断吲哚胺2,3-双加氧酶(IDO)激活,提高5-HT水平,改善LPS诱导抑郁小鼠的抑郁症状[58];通过激活PI3K-Akt-Nrf2/BDNF信号通路,改善氧化应激,提高BDNF含量,缓解嗅球摘除(OB)抑郁大鼠的抑郁症状[59]

2.5 栀子豉汤

研究发现栀子豉汤(栀子、淡豆豉)通过降低NLRP3、Caspase-1、IL-1β、IL-18、剪切消皮素D(Cleaved GSDMD)蛋白表达,抑制小胶质细胞活化以减轻海马神经炎症,并提高海马PSD-95和神经突触素1抗体(Synapsin-1)蛋白水平改善突触可塑性,缓解CUMS抑郁小鼠的抑郁症状[60]。并通过调节谷胱甘肽(GSH)/谷胱甘肽二硫化物(GSSG)途径,降低ROS水平,减少氧化应激损伤,改善CUMS大鼠的抑郁行为[61]

2.6 开心散

研究发现开心散(远志、人参、茯苓、石菖蒲)可以抑制IL-1β、IL-2、ΤΝF-α释放,调节TLR4/kappa B抑制因子激酶(IKK)/NF-κB信号通路以减轻神经炎症[62],调节肠道微生物群,下调HPA轴[63],改善CUMS抑郁小鼠的抑郁症状;通过降低MDA含量和ROS水平,增加脑中SOD活性,从而抗氧化应激,减少线粒体损伤,缓解皮质酮诱导抑郁小鼠的抑郁症状[64];通过调节色氨酸代谢和犬尿氨酸途径,增加5-HT合成,改善CRS抑郁大鼠的抑郁症状[65]。此外还可通过降低血清总胆固醇、本酰甘油和游离脂肪酸水平,提高血清高密度脂蛋白胆固醇水平,缓解CUMS抑郁大鼠的抑郁行为[66]

3 中药性味归经与抑郁症

中药性味归经是中医药理论的重要内容。以2020年版《中华人民共和国药典:一部》[67]中性味归经为标准,对前文所述研究涉及的26味中药作性味归经整理,得抗抑郁中药药性及占比为寒23.1%、凉11.5%、平15.4%、温50.0%;药味及其占比为酸15.4%、苦57.7%、甘38.5%、辛69.2%、淡4.0%;归经及其占比为肝31.0%、心34.6%、脾65.4%、肺54.0%、肾19.0%、胆12.0%、胃46.0%、大肠8.0%、三焦11.5%、心包4.0%。

由结果知上述26味抗抑郁中药的药性以寒、温居多,药味以苦、甘、辛居多,归经以肝、心、脾、肺、胃居多。一般寒性中药具有清热化痰、泻火通便等作用;温性中药具有散寒、通络、助阳等作用;苦味中药具有清泄、燥湿、坚阴等作用;甘味中药具有补虚、和中、缓急止痛等作用;辛味中药具有发散、行气、行血等作用[68]。“寒、温”二性与“苦、甘、辛”三味能治郁证实证之气郁、血瘀、火热、食积、湿滞、痰结,疗虚证之脏腑气血阴阳失调,而郁证之肝失疏泄、心失所养、脾胃健运失司、肺宣发肃降失常刚好对应“肝、心、脾、胃、肺”五经。但中药资源丰富,样本数量受限,需要更为深度的整理归纳。

4 讨论与展望

研究表明抑郁症和中药发挥抗抑郁作用都与脑相关,而与郁证病机密切相关的脏腑、气血等亦与脑有着密切联系。中医认为脑为髓之海,精髓充盛则脑海充盈,故精神饱满、情志正常。心主血,上供于脑,血足则脑髓充盈。肺朝百脉,辅心行血。脾胃健运,气血化源充足则脑得所养。肝藏血,又调畅气机,血气和调则脑清神聪。肾藏精,肾精化髓以充脑,肾精充盈则脑髓满,继而脑功能正常[68]

根据中医藏象学说,脏腑不仅是解剖学的概念,还涵盖人体生理功能系统,由此笔者提出中医郁证理论与抑郁症病理机制可能的联系:1)脏腑功能失常导致脑髓不足、脑失所养,影响脑功能,致使单胺类神经递质、NTF等分泌不足,突触可塑性及神经元的再生和分化也受到影响。2)肾虚、肾精不足影响肾上腺功能,使得HPA轴功能亢进。3)脏腑功能失常使得痰热内蕴而上蒙心窍,进而导致颅内炎症。4)肠道属于六腑,六腑能够受盛和运化饮食水谷,饮食水谷自胃入肠,再由脾吸收精微部分后输布全身,中医认为脾虚可致湿郁,而湿易生菌,故脾胃健运失司与肠道菌群失调可能有关,经过微生物-肠道-脑轴影响神经系统。

5 结语

中医秉持整体协调和辨证论治,其治疗疾病有多靶点、多途径、多层次的特点。中药作为中医最常用的治疗手段,其抗抑郁作用涉及多种机制。文章基于此,综述中药活性成分及中药复方通过促进单胺类神经递质和NTF的分泌、抑制HPA轴功能亢进和炎症反应以及神经元过度凋亡、改善氧化应激和突触可塑性、调节线粒体和肠道菌群、调节色氨酸和犬尿氨酸代谢、降低谷氨酸水平等发挥抗抑郁作用,并提出郁证与抑郁症之间可能存在的联系。

尽管大量研究证明了中药治疗抑郁症的价值,但仍存在一些问题:1)抑郁症发病机制较为复杂,而目前的研究主要是动物实验,缺少临床数据支持。2)中医郁证病机较为成熟,但和抑郁症的联系基本停留在临床表现上,并未将二者的病机对应起来。3)中医治病强调整体、辨证,虽然中药抗抑郁机制研究已经涉及肠道,但仍未有研究将脏腑之间的协调作为基点。4)中药复方成分复杂,能够作用于多个靶点,各成分之间的关系有待西医的解释。5)目前研究绝大多数都集中于中药的活性成分,这无疑是丢弃了中药多组分发挥疗效的特点。当然相信这些问题只是暂时的,随着科学技术的不断深入,临床中药治疗抑郁症必将取得突破性进展。

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Research progress on the mechanism of traditional Chinese medicine against depression
GAO Ce1 , HU Xiamin1,2     
1. Graduate School, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China;
2. College of Pharmacy, Shanghai University of Medicine & Health Sciences, Shanghai 201318, China
Abstract: Depression is a kind of mental disorder which seriously endangers human health. And it belongs to the category of "depression syndrome" in traditional Chinese medicine(TCM), and its pathogenesis is complex. At present, antidepressants generally have the characteristics of low effective rate, high addiction and serious adverse reactions, while TCM is particularly significant in the treatment of depression because of its multi-targets, multi-pathways and overall dialectical effects. Based on the antidepressant literature of TCM published in the past 5 years, this paper summarizes the antidepressant TCM through a variety of mechanisms, and puts forward new mechanism ideas on the basis of previous studies. In order to provide clinical application basis and new research direction for the treatment of depression with TCM.
Key words: traditional Chinese medicine    depression    antidepressant    mechanism    research progress