CN118021798A - epi-Equisetin在用于制备预防和治疗脂肪代谢综合症药物中的用途 - Google Patents
epi-Equisetin在用于制备预防和治疗脂肪代谢综合症药物中的用途 Download PDFInfo
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- CN118021798A CN118021798A CN202311448891.2A CN202311448891A CN118021798A CN 118021798 A CN118021798 A CN 118021798A CN 202311448891 A CN202311448891 A CN 202311448891A CN 118021798 A CN118021798 A CN 118021798A
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Abstract
本发明公开了epi‑Equisetin在用于制备预防和治疗脂肪代谢综合症药物中的用途,epi‑Equisetin由海洋真菌Fusarium sp.SCSIO 152发酵产生,是equisetin的异构体,能够制备降低细胞内脂质堆积,降低脂肪分化标志基因表达,增加Ucp1蛋白表达和降低脂肪细胞体积。为脂肪代谢综合症的治疗提供了新的备选药物。
Description
技术领域
本发明属于药学领域,具体涉及epi-Equisetin在用于制备预防和治疗脂肪代谢综合症药物中的用途。
背景技术
代谢综合症是一组紧密相关的心血管疾病风险因素的集合体,通常包括中心性肥胖、高血压、高血糖,以及异常的脂蛋白血症(通常表现为高甘油三酯和低高密度脂蛋白胆固醇水平)。标志着心血管疾病和2型糖尿病的显著增加的风险。治疗代谢综合症的方法首先着重于生活方式的改善,包括:健康饮食、体力活动、体重管理、戒烟等,在药物治疗方面,包括抗高血压药物:如利尿剂、ACE抑制剂或钙通道阻滞剂等,来控制高血压。降糖药物:如二甲双胍或SGLT2抑制剂来控制血糖水平。降脂药物:如他汀类药物来控制高胆固醇和高甘油三酯。尽管当前的治疗策略包括生活方式改变和一系列药物治疗来管理与症状相关的各种因素,但目前市场上的药物并不能完全满足患者的需求,尤其是在处理综合症的多个方面时。因此,开发具有全新作用靶点的代谢综合症治疗药物显得尤为重要。新药的研发不仅可以针对尚未被利用的生物途径,还可以探索与已知途径的不同互动方式,从而提供一种更为综合和有针对性的治疗方法,从而大大改善患者的预后和生活质量。
Equisetin(尹奎色亭)是一种天然产物,一种从海绵衍生真菌中分离出来的类萜类化合物。它具有特殊的结构和生物活性,已经引起了研究人员的广泛兴趣。它在生物体内具有多种生理作用,包括抗菌、抗真菌、抗肿瘤等。由于其潜在的药理学价值和生物活性,Equisetin已成为天然产物药物研究领域的重要研究对象。研究人员对其化学合成、生物合成途径以及生物活性的深入研究,有望为开发新的治疗方法和药物提供重要线索。差向异构体(Diastereomers)是指分子的结构相同,但立体构型不同的同分异构体。对于Equisetin来说,它可以存在不同的差向异构体,这些异构体的化学式相同,但它们的立体构型在空间中不同。由于Equisetin的分子结构中含有多个立体中心,因此它存在多个可能的差向异构体。这些差向异构体的存在可能会影响它们的生物活性和相互作用方式。本研究揭示了2epi-Equisetin(2位差向异构体尹奎色亭)在用于预防和治疗代谢综合症药物中的新用途。
发明内容
有鉴于此,本发明的目的之一在于提供一种epi-Equisetin在用于制备预防和治疗脂肪代谢综合症药物中的用途。
为达到上述目的,本发明提供如下技术方案:
epi-Equisetin在用于制备预防和治疗脂肪代谢综合症药物中的用途,所述epi-Equisetin的结构式如下:
本发明优选的,所述epi-Equisetin在用于制备降低细胞内脂质堆积的药物中的用途。
本发明优选的,所述epi-Equisetin在用于制备降低脂肪分化标志基因表达的药物中的用途。
本发明优选的,所述epi-Equisetin在用于制备增加Ucp1蛋白表达的药物中的用途。
本发明优选的,所述epi-Equisetin在用于制备降低脂肪细胞体积的药物中的应用。
本发明的有益效果在于:本发明提供了epi-Equisetin在用于制备预防和治疗脂肪代谢综合症药物中的用途,epi-Equisetin由海洋真菌Fusarium sp.SCSIO 152发酵产生,与equisetin为异构体,能够制备降低细胞内脂质堆积,降低脂肪分化标志基因表达,增加Ucp1蛋白表达和降低脂肪细胞体积,为脂肪代谢综合症的治疗提供了新的备选药物。
附图说明
为了使本发明的目的、技术方案和有益效果更加清楚,本发明提供如下附图进行说明:
图1为epi-Equisetin对脂代谢影响结果(A:epi-Equisetin对3T3-L1细胞内中性脂质堆积的影响,epi-Equisetin(0.25μM、0.5μM、1μM)和Equisetin(1μM);B:细胞经固定、油红O染色后,加入异丙醇30min,取上清,测量510nm下的吸光度,n=3;*P<0.05;**P<0.01;C:epi-Equisetin对细胞焦亡分化标志基因GSDMD表达情况;D:epi-Equisetin对脂肪分化标志基因C/EBPα表达情况;E:epi-Equisetin对脂肪分化标志基因Fabp4表达情况;F:epi-Equisetin对脂肪分化标志基因Pparγ表达情况;G:蛋白表达;H:Ucp1蛋白定量统计;I:Fabp4蛋白定量统计;J:Pparγ蛋白定量统计;K:高脂饮食饲喂epi-Equisetin(40mg/kg)灌胃、Equisetin作为阳性(40mg/kg)灌胃6周后小鼠的体形比较;L:灌胃45天测体重变化图;M:高脂饲喂6周后对照组、epi-Equisetin(40mg/kg)、Equisetin(40mg/kg)小鼠的胰岛素耐受性试验;N:高脂饲喂6周后对照组、epi-Equisetin(40mg/kg)、Equisetin(40mg/kg)小鼠的葡萄糖耐受性试验;O:小鼠肝脏,iWAT和BAT的形态学比较和重量统计,小鼠各组织形态学比较;P:小鼠肝脏,iWAT和BAT的形态学比较和重量统计,小鼠各组织重量统计;Q:epi-Equisetin、EQST对LO2细胞不同浓度存活率影响;R:高脂饲喂条件下对照组、epi-Equisetin(40mg/kg)、Equisetin(40mg/kg)BAT的H&E染色切片图;以上全部数值用平均值±标准差表示;n=3;*P<0.05;**P<0.01))。
具体实施方式
下面结合附图和具体实施例对本发明作进一步说明,以使本领域的技术人员可以更好的理解本发明并能予以实施,但所举实施例不作为对本发明的限定。
实施例1、epi-Equisetin的获得
海洋真菌SCSIO 152是从中国南海北部深海沉积土中分离纯化而来,菌种保存于中国科学院海洋微生物研究中心。
取海洋真菌SCSIO 152进行发酵,发酵产物用乙酸乙酯浸提,乙酸乙酯经蒸馏浓缩后得到总浸膏,将总浸膏经硅胶柱层析,采用正相柱层析:石油醚-氯仿体系梯度(100:0,80:20,70:30,50:50,0:100体积分数),接着用氯仿-甲醇体系梯度(98:2,95:5,90:10;50:50体积分数)洗脱,得到Fr.1~9共9个馏份。选用枯草芽孢杆菌抑菌活性追踪显示Fr.7~8为活性馏份,合并Fr.7~8后用中压反相MPLC层析(乙腈-水梯度洗脱0~20min,50%~100%,流速20mL/min)得到组分Fr.(7-8)-1-Fr.(7-8)-5。HPLC-DAD及活性追踪显示Fr.(7-8)-3为活性目标产物。最后用制备高效液相色谱(CH3CN横梯度洗脱20min,流速10mL/min)纯化,于16.2,17.3min分别得到化合物equisetin(1)(2.2g)、epi-equisetin(2)(2.0g)。化合物结构如下所示:
实施例2、epi-Equisetin的降脂活性评价
经检测,epi-Equisetin纯度>99%,油红O,QPCR,WB
细胞株:3T3-L1(小鼠胚胎成纤维细胞)
试验方法:
取对数生长期小鼠SVF细胞,消化、计数,以适宜浓度接种到已放入6孔板中,培养24h小时至细胞完全贴壁。细胞生长接触抑制后,细胞制成脂质堆积模型;给药组同时给予浓度为0.25μM,0.5μM和1μM的epi-Equisetin;阳性药组给予Equisetin(1μM)。24h后,弃去培养基,用PBS洗2遍,加4%多聚甲醛在4℃固定1h,弃去多聚甲醛。每孔加油红O工作液200μL室温染色30min,结果如图1所示,epi-Equisetin可以显著减少脂肪前体细胞分化形成脂滴。PBS洗净油红工作液,每孔加异丙醇300μL微升溶解附着脂质上染料,酶标仪510nm波长下测定OD值,结果如图1中B所示。
结果表明epi-Equisetin在1μM的浓度下可以抑制细胞细胞脂滴的形成,其作用强度与阳性药Equisetin相当。
实施例3、epi-Equisetin对RNA水平表达评价
细胞培养:分化细胞铺板时取对数生长期3T3-L1或小鼠SVF细胞,以每孔10×104个细胞接种于6孔板中,培养至细胞接触抑制后。每孔加入用药物处理的成脂分化诱导液1.5mL。
48小时后换成含有胰岛素、IBMX和地塞米松的培养基,两天后换为只含胰岛素的培养基,每隔两天换一次培养基直到4-6天后出现明显的脂滴。增殖细胞铺板时取3T3-L1细胞每孔5×104个细胞接种于6孔板中,次日加药处理。
RNA提取:将诱导分化后的成熟脂肪细胞或增殖加药处理后24小时细胞用PBS溶液轻柔润洗2次,加入1mL Trizol于六孔板中,每孔从上至下吹取细胞,收取细胞悬液与1.5mL无菌无酶离心管中,冰上裂解30min。每管中加入200μl三氯甲烷溶液,涡旋机震荡混匀,冰上静置10min,待到液体出现明显自然分层后4度12000r离心15min。从离心机中小心取出离心管,此时匀浆分为3层,小心吸取上清液转移至另一新的离心管中,切勿吸取白色中间层,吸出上层水相至新预冷的无酶无菌管中,加入等体积异丙醇溶液,吹打混匀,冰上静置20min后,4度12000r离心15min。弃上清,加入预冷的75%乙醇充分洗涤,4度12000r离心10min;弃乙醇溶液,倒扣离心管自然晾干。加入20μL的DEPC水溶解RNA沉淀,吹打混匀后,用Nanodrop 2000测定其RNA浓度。
逆转录:根据赛维尔SweScript All-in-One RT SuperMix for qPCR(One-StepgDNA Remover)说明书配制20μL反转录体系。取0.2mL离心管,每管分别加入5×SweScriptAll-in-One SuperMix for qPCR 4μL,gDNA Remover 4μL,根据测定的RNA浓度计算出相应体积,剩余体积用DEPC水补足。逆转录反应程序设置为:25℃,5min;42℃,30min;85℃,5s;4℃,孵育。反应结束后每管加180μL无菌无酶水得到cDNA产物。
实时荧光定量PCR:配制10μL的PCR反应体系,其中SYBR qPCR Master Mix(2×)5μL,上游引物(10μmol/L)0.3μL,下游引物(10μmol/L)0.3μL,cDNA模板1μL,ddH2O3.4μL。加入后避光震匀,掌上离心机离心2秒进行上机。采用三步法PCR反应程序:95℃预变性10min,95℃变性10s,60℃退火30s,72℃延伸30s,共40个循环。
荧光定量检测引物:
GSDMD F:5’-CCATCGGCCTTTGAGAAAGTG-3’(SEQ ID NO.1);
R:5’-ACACATGAATAACGGGGTTTCC-3’(SEQ ID NO.2);
CEBP/αF:5’-CAAGAACAGCAACGAGTACCG-3’(SEQ ID NO.3);
R:5’-GTCACTGGTCAACTCCAGCAC-3’(SEQ ID NO.4);
FABP4 F:5’-AAGGTGAAGAGCATCATAACCCT-3’(SEQ ID NO.5);
R:5’-TCACGCCTTTCATAACACATTCC-3’SEQ ID NO.6);
PPARγF:5’-TCGCTGATGCACTGCCTATG-3’(SEQ ID NO.7);
R:5’-GAGAGGTCCACAGAGCTGATT-3’(SEQ ID NO.8);
β-actin F:5’-GTCCCTGACCCTCCCAAAAG-3’(SEQ ID NO.9);
R:5’-GCTGCCTCAACACCTCAACCC-3’(SEQ ID NO.10);
数据处理:以β-actin作为内参基因,检测目的基因及内参基因的表达情况,并用2-△△Ct法计算二者的相对表达量,结果如图1中C-F所示。结果表明,epi-Equisetin对脂肪分化标志基因表达均有显著降低情况。
实施例4、epi-Equisetin对蛋白表达评价
细胞培养:分化细胞铺板时取对数生长期3T3-L1或iWAT细胞,以每孔10×104个细胞接种于6孔板中,培养至细胞接触抑制后。每孔加入用药物处理的成脂分化诱导液1.5mL。48小时后换成只含胰岛素的培养基,每天轻柔换培养基4-6天直至显微镜下观察出明显脂滴。增殖细胞铺板时取3T3-L1细胞每孔5×104个细胞接种于6孔板中,次日加药处理。
细胞总蛋白的提取:弃去培养皿中培养液,将各处理组的细胞用预冷的PBS轻柔润洗3次,6孔板每孔添加120μL含有PMSF、蛋白酶抑制剂和磷酸酶抑制剂的细胞裂解缓冲液各1%的RIPA溶液中,用黄枪头尾部将细胞从培养皿中刮下来,并将细胞溶液收集于1.5mL预冷离心管中,冰上静置充分裂解30分钟,4℃下12000rpm离心10分钟,吸取上清液装于新的1.5mL离心管中。
BCA法测定蛋白浓度:用RIPA对BSA标准品进行稀释。将试剂A摇晃混匀,A:B按体积比50:1配制适量BCA工作液,并充分混匀。分别取25μL新鲜配制的BCA标准溶液和待测样品,加入到96孔板中。在每孔BSA标准液与待检样本中加入BCA工作液200μL,并充分混匀,将96孔板放入37℃的孵箱中放置30min直至最低浓度的BSA标准液变为紫色,酶标仪在560nm波长下测量蛋白浓度。以BSA标准浓度液建立标准曲线,根据标准曲线计算出每个样本的蛋白浓度。
上样样品的制备:将上清液与5×loading buffer按4:1的比例混合,在95℃金属浴中加热10分钟,然后冷却并分装,最终在-80℃保存。确保每个样本的蛋白浓度一致。
配制分离胶(12%)10mL:去离子水3.3mL,30%丙烯酰胺混合液4.0mL,1.5M Tris-Cl缓冲液2.5mL,10% APS100μL,10% SDS100μL,TEMED 4μL。加入异丙醇压胶,平桌面静置30min后倒出异丙醇并用双蒸水清洗干净。
配制浓缩胶(5%)4mL:将2.2mL去离子水、0.67mL 30%丙烯酰胺混合液、1mL0.5MTris-Cl缓冲液、40μL 10% APS和4μL TEMED混合,并加至溢出,插入梳子(1.5mm),晾干40分钟。
上样:将聚丙烯酰胺凝胶浸没于电泳缓冲液中,拔掉梳子,每个泳道加入约20μL蛋白样品,或加入5-10μL预染的蛋白质标准分子量Marker。
溶液配置:
电泳缓冲液:称量并加入3.02g Tris,18.8g甘氨酸与1g SDS,用双蒸水定容至1L,其中成分含量Tris(25mM),甘氨酸(250mM),0.1% SDS。
电转缓冲液:称量并加入5.82g Tris,2.93g Glycine与3.75mL SDS,用双蒸水定容至850mL,其中成分含量Tris(48mM),甘氨酸(39mM)与10% SDS。使用前加入150mL甲醇并混匀。
TBST溶液:称量并加入12.1g Tris-HCl,9g氯化钠与1mL Tween 20,加入双蒸水定容至1L,其中成分含量Tris-HCl(100mM),0.9% NaCl,0.1% Tween。并调pH至7.6。封闭液:称取2.5g脱脂羊奶粉,于50mL的TBST充分溶解,现用现配。
10% APS:将1g APS溶解于10mL纯化水中,然后进行分装并在-80℃下长期保存。
电泳:电泳开始时以80V恒定电压进行约0.5小时的电泳过程。当溴酚蓝完全越过浓缩胶后,电压转换至120V,并在分离胶中充分进行约3小时的蛋白分离。根据Marker的电泳情况,一旦目的蛋白分离完毕,将停止电泳过程。
转膜:使用Bio-Rad公司的转膜装置,将PVDF膜用甲醇浸泡3分钟,激活膜表面。按照顺序铺放滤纸和PVDF膜,依次为:海绵→3层浸湿转膜缓冲液的滤纸→聚丙烯酰胺凝胶→PVDF膜→3层浸湿转膜缓冲液的滤纸→海绵。使用玻璃涂布器排除海绵和滤纸之间的气泡,并确保每一层之间没有气泡。完成转膜装置的组装后,以200mA的恒流将蛋白转移到PVDF膜上,转膜时间约为2.5小时。
封闭:转膜完成后,立即在PVDF膜的正反面做上标记,并进行TBST清洗10分钟。随后,将膜转移到含有5%脱脂奶粉的封闭液中,在室温下缓慢地在摇床上摆动,进行2小时的封闭。
一抗孵育:将膜放入TBST中进行3次洗膜,每次持续10分钟。按照一抗的说明书,适当稀释一抗溶液。然后将膜浸泡在一抗溶液中,将摇床缓慢摇动,室温条件下孵育2小时,或者选择在4℃下过夜孵育。一抗的详细信息可参考表2。
二抗孵育:将膜置于TBST洗膜3次,每次10min。按照1∶3000比例稀释二抗。将膜置于二抗中孵育1.5h。二抗信息见表3。
成像分析:将膜置于TBST洗膜3次,每次10min。利用Bio-Rad ChemiDocTM XRS+成像系统检测目的蛋白,并分析蛋白表达量,结果如图1中G~J所示。结果显示,epi-Equisetin处理后增加Ucp1蛋白表达,降低Fabp4、Pparγ表达。
表1、实验一抗信息
表2、实验中使用的二抗
实施例5、epi-Equisetin对小鼠体重表达评价
9只雄性C57BL/6J小鼠(常州卡文斯实验动物有限公司)。买回适应环境3周,按体重分为均等的三组对照组(生理盐水)药物处理组(epi-Equisetin)阳性组(Equisetin),分别灌胃45天测体重变化,结果如图1中K和L所示。结果表明,epi-Equisetin灌胃后,从第2周可显著性预防小鼠表型变胖。
实施例6、epi-Equisetin对小鼠葡萄糖耐受性胰岛素耐受性评价
小鼠准备:每组实验小鼠在实验前更换垫料。GTT禁食一晚,ITT禁食4h。禁食期间,小鼠保持正常的饮水;称取每只小鼠的体重,并用标记笔在小鼠尾巴的根部标记序号,以便在实验过程中能快速的辨认所测小鼠。
用剪刀剪去小鼠尾巴末端约-2mm,轻轻挤压小鼠尾巴,让血液富集成一滴,用血糖仪测定血糖,测定值认定为0min的血糖值,操作尽量轻柔,使小鼠不至于过度惊吓,让小鼠适应30min之后,开始准备腹腔注射胰岛素溶液。
将小鼠轻轻抓起,按照标准的腹腔注射操作用1mL注射器给小鼠注射胰岛素溶液。注射的体积根据小鼠的体重决定,注射剂量为0.01mL/g。在15min,30min,45min,60min按照步骤(3)的操作测定每只小鼠各个时间点的血糖值。实验完毕后,将每笼小鼠补充上饲料。血糖值结果如图1中M和N所示,结果显示epi-Equisetin对小鼠胰岛素敏感性无显著影响。
实施例7
以上试验结束后,人道处死小鼠后,酒精擦拭小鼠腹部,打开腹腔,搜集iWAT、Ewat、BAT、肝脏等小鼠各组织形态学比较;以及对小鼠各组织重量统计,结果如图1中O和P所示。结果显示,epi-Equisetin处理后显著降低iWAT和BAT重量。并且HE染色明显观察出BAT、iWAT脂肪细胞较小,如图1中R所示。
实施例8
将EQST、epi-EQST的母液,稀释的到培养基里。稀释成的培养基中药物浓度为1μM、10μM、20μM、40μM、60μM、80μM、100μM、120μM、140μM。每个浓度三个孔,每孔加100μL药物溶液。MTT检测:加药处理LO2细胞后24小时,观察细胞。噻唑兰粉末中配制成5mg/mL的MTT溶液,用不完的可以放-20℃冰箱避光保存。在每孔中加入20μL MTT溶液,使终浓度为0.5mg/mL。在37℃、5% CO2、90%湿度条件下培养4小时。尽量轻柔吸取孔中全部上清液,防止单层细胞破裂,每孔加入200ml DMSO溶液。将孔板避光放在摇床上以摇10min,使甲臜全部溶解,用酶标仪在490nm处测量吸光度。用Excel及Graphpad Prism处理并分析结果。结果如图1中Q所示,epi-Equisetin处理LO2细胞存活率相比EQST在100uM更高且出现极其显著性差异。
以上所述实施例仅是为充分说明本发明而所举的较佳的实施例,本发明的保护范围不限于此。本技术领域的技术人员在本发明基础上所作的等同替代或变换,均在本发明的保护范围之内。本发明的保护范围以权利要求书为准。
Claims (5)
1.epi-Equisetin在用于制备预防和治疗脂肪代谢综合症药物中的用途,其特征在于:所述epi-Equisetin的结构式如下:
2.根据权利要求1所述的用途,其特征在于:所述epi-Equisetin在用于制备降低细胞内脂质堆积的药物中的用途。
3.根据权利要求1所述的用途,其特征在于:所述epi-Equisetin在用于制备降低脂肪分化标志基因表达的药物中的用途。
4.根据权利要求1所述的用途,其特征在于:所述epi-Equisetin在用于制备增加Ucp1蛋白表达的药物中的用途。
5.根据权利要求1所述的用途,其特征在于:所述epi-Equisetin在用于制备降低脂肪细胞体积的药物中的应用。
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