CN113041221B - 一种ros敏感及h2s供体响应型纳米胶束的制备方法及应用 - Google Patents

一种ros敏感及h2s供体响应型纳米胶束的制备方法及应用 Download PDF

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CN113041221B
CN113041221B CN202110307136.7A CN202110307136A CN113041221B CN 113041221 B CN113041221 B CN 113041221B CN 202110307136 A CN202110307136 A CN 202110307136A CN 113041221 B CN113041221 B CN 113041221B
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陈大全
周绣棣
郭春静
陈强
李毅
刘雪
于彩薇
苏彦国
郭慧敏
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Yantai University
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Abstract

本发明提供了一种ROS敏感及H2S供体响应型纳米胶束的制备方法及应用;包括:制备反应溶液1;制备反应溶液2,将反应溶液2滴入反应溶液1中,得到反应溶液3;通过透析的方法除去杂质,冻干得到HATM冻干产物;步骤3,称取HATM冻干产物和雷帕霉素,溶于DMF中,自组装的方式形成HATM@RAP,并将未包载的游离药物除去,即可。发明是通过透明质酸与巨噬细胞表面CD44受体特异性结合,使得药物在肾缺血再灌注损伤部位聚集,从而实现靶向作用;本发明通过引入ROS敏感基团,使新型给药系统到达ROS浓度较高的部位时,能快速释放药物,从而实现快速治疗的效果;本发明通过引进H2S供体,使得在肾脏部位能缓慢释放H2S,最终起到了预防炎症损伤以及促进肾缺血再灌注保护的作用。

Description

一种ROS敏感及H2S供体响应型纳米胶束的制备方法及应用
技术领域
本发明涉及医药领域;尤其涉及一种ROS敏感及H2S供体响应型纳米胶束的制备方法及应用。
背景技术
肾缺血再灌注损伤(RIRI)是急性肾损伤的主要原因之一,常见于各类临床事件包括心脏外科手术、肾移植、心肺复苏、休克、败血症等。现如今治疗主要是延缓肾脏疾病的进展,无特效药所能治疗。肾脏发生缺血再灌注损伤时,ROS可引起氧化应激,对肾脏造成严重损害。巨噬细胞同时在肾损伤的发生和发展过程中起着重要作用。H2S具有预防炎症和白细胞粘附、抵抗氧化应激和肾缺血再灌注损伤保护等作用。现如今治疗RIRI的方法主要是延缓肾脏疾病的进展,如抗炎、抗高血压、抗贫血、抗氧化、抗应激、抑制肿胀等。因此,没有一种有效的药理学方法可以抑制或逆转RIRI的进展。
发明内容
本发明的目的是提供了一种ROS敏感及H2S供体响应型纳米胶束的制备方法及应用。
本发明是通过以下技术方案实现的:
本发明涉及一种ROS敏感及H2S供体响应型纳米胶束的制备方法,具体包括以下步骤:
1)透明质酸-硫缩酮-对甲氧基苯酰脲(HATM)材料的合成
称取EDC 114mg、DMAP 43.5mg和TKL 67.2mg,溶于2mL甲酰胺中,超声使其溶解。溶解后置于30-40℃磁力搅拌器中进行催化1-2h,催化期间注意遮光。催化完成后,HA62.8mg,溶于5mL甲酰胺中,加热使其溶解。并将HA溶液逐滴滴入TKL的催化溶液中,40-50℃下磁力搅拌24h,得到反应溶液1;
称取MPT 54mg,HoBT 81mg,EDC 114mg,溶于2mL DMF溶液中,超声使其溶解。溶解完成后置于30-40℃磁力搅拌器中进行催化1-2h,得到反应溶液2。催化完成后,将反应溶液2逐滴滴入反应溶液1中,共分为2次滴加,每次间隔0.5h,并于40-50℃下磁力搅拌24h,得到反应溶液3。反应完成后,通过透析的方法除去杂质,冻干得到 HATM冻干产物;
称取HATM冻干产物30mg和6mg雷帕霉素,溶于3mL DMF中,然后置于透析袋 (MW=8000-12000)中,通过自组装的方式形成HATM@RAP,并将未包载的游离药物除去。
本发明的原理为:本发明以HA为主要靶点,构建具有炎症部位巨噬细胞CD44靶向的载体;引入硫缩酮键,使得该载体具有ROS响应;引入对甲氧基苯硫脲,使得该载体进入在细胞环境中能缓慢释放H2S。
本发明涉及的一种新型的ROS响应及H2S供体新型纳米载体,以减少ROS的浓度,增加H2S的产生,减少炎症因子的形成,降低对肾脏部位的损害。
将本发明制备得到的纳米载体用于医药领域,采用新型的纳米给药系统,以提高脂溶性药物的溶解度,增加药物的生物利用度;
本发明是通过透明质酸(HA)与巨噬细胞表面CD44受体特异性结合,使得药物在肾缺血再灌注损伤部位聚集,从而实现靶向作用;本发明通过引入ROS敏感基团,使新型给药系统到达ROS浓度较高的部位时,能快速释放药物,从而实现快速治疗的效果;本发明通过引进H2S供体,使得在肾脏部位能缓慢释放H2S,最终起到了预防炎症损伤以及促进肾缺血再灌注保护的作用。
本发明具有以下优点:
(1)本发明通过合成了HATM@RAP新型胶束,使其拥有ROS敏感特性及H2S释放特性。
(2)本发明通过粒径仪测定HATM@RAP胶束的粒径及ζ电位,通过电子透射电镜(TEM)观察胶束的外貌形态,粒径为169.21nm左右,zeta电位为-18.84mV,粒子呈球形;
(3)本发明通过在H2O2不同浓度下HATM的体外释放表明,H2O2浓度越高,体外释放越快,可以起到在H2O2下快速释放的作用;
(4)本发明通过对肾系膜细胞及Raw 264.7巨噬细胞的细胞摄取研究发现,本发明合成的HATM@RAP新型胶束能正常进入细胞内部,具有良好的生物相容性。并且其细胞摄取呈时间依赖性和浓度依赖性;
(5)本发明通过对肾系膜细胞及Raw 264.7巨噬细胞的细胞毒性研究,可以发现本发明合成的HATM@RAP新型胶束对两种细胞并无严重损伤,细胞存活率均大于90%,保证了新型制剂的安全性;
(6)本发明通过对细胞内H2O2及H2S的浓度检测发现,本发明合成的HATM@RAP新型胶束能产生H2S,并且降低了H2O2的浓度,具有良好的ROS抑制作用和促进H2S产生的作用。
附图说明
图1是本发明制备方法涉及的各部分载体材料的选择及其作用示意图;
图2是本发明制备的新型的ROS响应及H2S供体新型纳米载体的合成路线图;
图3是本发明制备的新型的ROS响应及H2S供体新型纳米载体的1H-NMR图;
图4是本发明制备的新型的ROS响应及H2S供体新型纳米载体的红外吸收光谱图;
图5是本发明制备的新型的ROS响应及H2S供体新型纳米载体的粒径、ζ电位、电镜图;
图6是在不同H2O2条件下本发明制备的新型的ROS响应及H2S供体新型纳米载体的体外释放图;
图7是Raw264.7细胞的浓度依赖、时间依赖摄取图;
图8是肾系膜细胞的浓度依赖、时间依赖摄取图;
图9是Raw 264.7不同时间细胞毒性图;
图10是肾系膜细胞不同时间细胞毒性图;
图11是Raw264.7细胞内H2S浓度测定图;
图12是Raw264.7细胞内H2O2浓度测定图。
具体实施方式
下面结合具体实施例对本发明进行详细说明。应当指出的是,以下的实施实例只是对本发明的进一步说明,但本发明的保护范围并不限于以下实施例。
实施例
本实施例涉及一种ROS敏感及H2S供体响应型纳米胶束的制备方法,具体包括以下步骤:
1)透明质酸-硫缩酮-对甲氧基苯酰脲(HATM)材料的合成:见图1和图2所示:
称取EDC 114mg、DMAP 43.5mg和TKL 67.2mg,溶于2mL甲酰胺中,超声使其溶解。溶解后置于30-40℃磁力搅拌器中进行催化1-2h,催化期间注意遮光。催化完成后,称取HA62.8mg,溶于5mL甲酰胺中,加热使其溶解。并将HA溶液逐滴滴入 TKL的催化溶液中,40-50℃下磁力搅拌24h,得到反应溶液1;
称取MPT 54mg,HoBT 81mg,EDC 114mg,溶于2mL DMF溶液中,超声使其溶解。溶解完成后置于30-40℃磁力搅拌器中进行催化1-2h,得到反应溶液2。催化完成后,将反应溶液2逐滴滴入反应溶液1中,共分为2次滴加,每次间隔0.5h,并于40~50℃下磁力搅拌24h,得到反应溶液3。反应完成后,通过透析的方法除去杂质,冻干得到 HATM冻干产物;
称取HATM冻干产物30mg和6mg雷帕霉素,溶于3mL DMF中,然后置于透析袋 (MW=8000-12000)中,通过自组装的方式形成HATM@RAP,并将未包载的游离药物除去。
2)HATM材料的表征
用FT-IR、1H-NMR对其结构进行表征,见图3和图4所示;通过1H-NMR图谱(图3) 显示,δ7.87(m,2H,Ar-H),δ6.76(m,2H,Ar-H),δ3.10(s,3H,Ar-O-CH3),δ0.94(6H,S-C-CH3)。通过FT-IR显示,3400.85cm-1为N-H振动峰,3275.17cm-1为-OH振动峰,1704.00cm-1为COO-振动峰,1649.76cm-1为N-H平面振动峰,1623.63cm-1为CO-NH振动峰。验证了HATM的合成;
3)HATM@RAP的表征
通过粒径仪测定HATM@RAP胶束的粒径及ζ电位,见图5所示,通过电子透射电镜(TEM)观察胶束的外貌形态,粒径为169.21nm左右,zeta电位为-18.84mV,粒子呈球形。
4)载药量与包封率的测定
载药胶束的载药量、包封率测定
载药量(%)=(胶束中所包载药物的含量/胶束总质量)×100%;
包封率(%)=(胶束中所包载药物含量/药物的初始加入量)×100%。
5)HATM@RAP米胶束的体外性质考察,见图6所示;
取一定量的HATM@RAP,并置于MW=8000~12000的透析袋。将其置于20mL分别含有不同浓度的H2O2的pH7.4 PBS释放介质中,在37℃和120rpm的摇床中,进行体外药物释放。固定时间点用等量的新鲜介质置换各样品的释放介质,每次换取0.5mL。将得到的样品通过0.22μm的微孔滤膜过滤。然后计算累计释放量。
本实施例制备HATM@RAP米胶束的应用
细胞学研究
1)细胞毒性实验。见图9和图10所示。对肾系膜细胞及Raw 264.7巨噬细胞接种于96孔板中培养,并在不同的时间段通过CCK8实验计算细胞存活率。可见本发明合成的HATM@RAP新型胶束对两种细胞并无严重损伤,细胞存活率均大于90%,保证了新型制剂的安全性;
2)细胞摄取实验。见图7和图8所示。对肾系膜细胞及Raw 264.7巨噬细胞接种于96孔板中培养,并加入不同浓度的HATM@RAP,在不同时间对其进行细胞摄取实验的研究。本发明合成的HATM@RAP新型胶束能正常进入细胞内部,具有良好的生物相容性。并且其细胞摄取呈时间依赖性和浓度依赖性。
3)细胞内H2O2及H2S浓度测定。见图11和图12所示,将Raw 264.7巨噬细胞接种于6孔板,加入LPS(1μg/mL)刺激后,按照H2O2及H2S检测试剂盒说明书进行检测及计算各组上清H2O2及H2S水平。可见,在H2O2不同浓度下HATM的体外释放表明,H2O2浓度越高,体外释放越快,可以起到在H2O2下快速释放的作用。本发明合成的HATM@RAP 新型胶束能产生H2S,并且降低了H2O2的浓度,具有良好的ROS抑制作用和促进H2S产生的作用。
以上对本发明的具体实施例进行了描述。需要理解的是,本发明并不局限于上述特定实施方式,本领域技术人员可以在权利要求的范围内做出各种变形或修改,这并不影响本发明的实质。

Claims (1)

1.一种ROS敏感及H2S供体响应型纳米胶束的制备方法,其特征在于,所述方法包括如下步骤:
步骤1,称取EDC 114mg、DMAP 43.5mg和TKL 67.2mg,溶于2mL甲酰胺中,超声溶解;置于磁力搅拌器中进行催化;待催化完成后,称取HA 62.8mg,溶于5mL甲酰胺中,加热溶解;并将HA溶液逐滴滴入TKL的催化溶液中,在温度为40-50℃的条件下,磁力搅拌24h,得到反应溶液1;
步骤2,称取MPT 54mg,HoBT 81mg,EDC 114mg,溶于2mL DMF溶液中,超声溶解;置于磁力搅拌器中进行催化,得到反应溶液2;待催化完成后,将反应溶液2滴入反应溶液1中,分为2次滴加,在温度为40-50℃条件下,磁力搅拌24h,得到反应溶液3;反应完成后,通过透析的方法除去杂质,冻干得到HATM冻干产物;
步骤3,称取HATM冻干产物30mg和6mg雷帕霉素,溶于3mL DMF中,然后置于透析袋中,通过自组装的方式形成HATM@RAP,并将未包载的游离药物除去,即可;
步骤1中,所述磁力搅拌器的温度为30-40℃,所述催化的时间为1-2h;
步骤2中,所述磁力搅拌器的温度为30-40℃,所述催化的时间为1-2h,所述2次滴加的间隔时间为0.5h。
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