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贯叶连翘中二蒽酮类化合物免疫活性研究及其白蛋白-IgG抗体偶联物的研制
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摘要
贯叶连翘(HypericumperforatumLinn.)提取物包含很多类复杂的成分,每一类成分都有其不同的药理作用。二蒽酮类化合物就是其中的一类,主要包括金丝桃素、伪金丝桃素、原金丝桃素、原伪金丝桃素、环金丝桃素等,二蒽酮类化合物具有很多药理作用如抗炎、抗抑郁、抗肿瘤及抗病毒作用,目前其研究存在几个问题,1、抗病毒机理不明确。2、药物的生物利用度低。3、对机体作用部位不明。针对抗病毒机理问题,本文从免疫学角度研究了二蒽酮类化合物对免疫器官及机体相关酶和细胞因子的作用,并探讨了对机体免疫相关网络的影响,阐述了其可能的抗病毒机理之一其就是增强机体的免疫力。针对其生物利用度的问题,本文将其用生物可降解材料白蛋白包裹,制成药物白蛋白包合物,提高了药物的生物利用度,提高了其有效含量。针对其作用部位不明确的问题,本文将二蒽酮类化合物白蛋白包合物与IgG抗体偶联,并进行初步检测,这为构建药物定向给药系统提供理论依据。主要研究内容如下:
     1.二蒽酮类对小鼠免疫功能和抗氧化能力的影响。通过测定小鼠的脾脏指数和胸腺指数,与自由基产生和清除相关的6种酶(T-AOC、T-SOD、MPO、XOD、GSH-PX、POD)活性,及体内MDA、H_2O_2和NO水平,并对免疫器官作组织病理学观察,得出以下结论:二蒽酮类能够显著提高小鼠脾脏指数,极显著降低小鼠的MDA、NO和XOD水平(P<0.01),极显著提高小鼠的T-SOD,T-AOC,GSH-PX,POD水平(P<0.01),对H_2O_2的水平没有影响。表明二蒽酮类能通过提高脾脏指数,降低过氧化物产物MDA和NO水平,改变机体内对自由基产生和清除相关酶活性来影响体内自由基的产生和清除,使机体免疫器官免受损伤,以拮抗地塞米松所致的免疫抑制,增强机体的免疫功能。组织病理学观察结果表明二蒽酮类对免疫抑制小鼠的肝脏及脾脏具有一定的修复功能。胸腺也有一定恢复作用,但作用不明显。
     2.二蒽酮类对小鼠T细胞表面膜分子及血清细胞因子的影响。采用ELISA法检测小鼠T细胞表面膜分子(CD3、CD4、CD8、CD4/CD8)及血清细胞因子(IL-4、IL-6、IL-10、IFN-γ、TNF-α)的水平,得出以下结论:二蒽酮类能够显著提高小鼠T淋巴细胞亚群CD3、CD4、CD8及CD4/CD8及细胞因子IFN-γ和TNF-α的水平,显著降低小鼠血清细胞因子IL-4、IL-6和IL-10的水平。表明二蒽酮类能够增加小鼠体内的成熟T细胞数量,促使T细胞释放各种细胞因子,以及调节机体内Th1细胞和Th2细胞的活性来上调机体免疫功能。
     3.二蒽酮类对大鼠cAMP/cGMP信号通路的影响。采用ELISA法检测大鼠血清的cAMP和GMP水平,并计算二者比值,得出以下结论:二蒽酮类能够通过显著降低机体的cAMP水平,显著提高机体的cGMP的水平及cAMP/cGMP的比值来影响机体的cAMP/cGMP信号通路。表明二蒽酮类能够增强B淋巴细胞的分化与增殖,并促进其抗体生成,增强体液免疫的功能。
     4.二蒽酮类对大鼠下丘脑-垂体-肾上腺轴的影响。采用ELISA法检测大鼠血清的ACTH和CORT水平,得出以下结论:二蒽酮类通过显著降低机体的ACTH和CORT的水平来影响大鼠下丘脑-垂体-肾上腺轴,表明二蒽酮类通过降低ACTH和CORT水平来促进T细胞转化,降低下丘脑-垂体-肾上腺轴功能亢进,使由于HPA轴功能亢进引起的下丘脑、垂体、肾上腺的功能异常,及免疫力低下效应减弱。
     5.二蒽酮类对大鼠神经内分泌免疫的网络相关因子的影响。采用ELISA法检测大鼠神经内分泌免疫的网络相关因子IL-1、DA、NA和5-HT的水平,得出以下结论:二蒽酮类通过显著降低机体的IL-1、DA、NA和5-HT水平来影响神经内分泌免疫的网络。表明二蒽酮类可能影响血管加压素对肾上腺的作用,降低GC释放量使免疫过程的各个环节的抑制状态缓解,也可能影响垂体,通过ACTH水平降低来降低肾上腺皮质激素含量从而缓解抑制免疫状态,或者通过提高机体内DA的水平来抑制B细胞而增强T细胞和巨噬细胞的功能,从而使机体免疫功能恢复。
     6.二蒽酮类白蛋白包合物的制备。采用去溶剂化-交联法制备二蒽酮类白蛋白包合物,并对其处方工艺进行优化,同时分析其形态,粒径及电位,测定其产率、包封率和载药量,并对其体外释放进行评价,得此包合物最佳制备工艺为:白蛋白加入量为1.5g,交联时间为24h,戊二醛用量为15μL,pH为9,乙醇滴加速度为1.0mL/min。其形态为球形,大小均一,平均粒径为122nm,电位值大于-50mv。产率、包封率和载药量分别为95.5%、71.43%和4.13%。此包合物在前4d的释放量占50%以上,4d到10d时,释放量约占总量的10%-15%,大约可持续4-5d,10d到25d时,药物浓度的变化不大。表明去溶剂化-交联法是一种适合二蒽酮类白蛋白包合物制备的方法,所制备的二蒽酮类白蛋白包合物形态规整、均一,稳定性好,具有高的产率、包封率及载药量,具有一定控缓释作用。
     7.二蒽酮类白蛋白包合物与免疫球蛋白G抗体的偶联。采用戊二醛法制备二蒽酮类白蛋白包合物-免疫球蛋白G抗体偶联物,并对其偶联条件进行优化,用SDS-PAGE电泳检测。得二蒽酮类白蛋白包合物-免疫球蛋白G抗体偶联物最佳制备工艺:免疫球蛋白G抗体与包合物的质量比为1:1,戊二醛用量为总溶液体积的1/4,偶联时间为2h,温度为25℃,pH为中性。经SDS-PAGE电泳检测二蒽酮类白蛋白包合物-免疫球蛋白G抗体偶联物在210kDa附近有一条带。免疫球蛋白G抗体在150kDa附近有一条带,二蒽酮类白蛋白包合物在66kDa附近有一条带。这与理论上免疫球蛋白G抗体及二蒽酮类白蛋白包合物的分子量相符。表明去溶剂化-交联法是一种适合二蒽酮类白蛋白包合物制备的方法。
Hypericum extract contains numerous active compounds, each type of them have different pharmacological effects. Dianthrone is one of active compounds of Hypericum extract, including hypericin, pseudo hypericin, the original of hypericin, the original pseudo-hypericin, Central hypericin, etc. Dianthrone has many pharmacological effects such as anti-inflammatory, anti-depressants, anti-tumor and antiviral activity. There are several problems during the reasch,1. The anti-virus mechanism of Dianthrone is not clear.2. The low bioavailability of active ingredient.3. Site of action in the body is unknown. To the problems of the anti-virus mechanism, the roles of dianthrone on the immune organs, enzymes and cytokines were studied, the effects of dianthrone on the immune network were discussed, the conclusion of dianthrone antiviral mechanism was to be drawn, and which was to enhance the body's immunity. To increase the bioavailability, dianthrone was encapsulated in biodegradable materials bovine serum albumin (BSA) improving the bioavailability and effective content of dianthrone and also providing ideas for other similar active ingredients research. To clear the site of action in the body, dianthrone albumin clathrate and IgG antibodies were conjugated successfully, initial detection were conducted to provide a theoretical basis for targeted drug delivery systems. The research works were performd as follows.
     1. Effects of dianthrone on immune function and antioxidant capability in mice. The thymus index, the spleen index, the activities of six enzymes(T-AOC、T-SOD、MPO、XOD、GSH-PX、POD), and the level of MDA, H2O2and NO were measured. Histopathological sections of immune organs have been observed. The following conclusions to be drawn: dianthrone had a functions to increase the spleen index, the level of T-SOD, T-AOC, GSH-PX and POD, decrease the level of MDA, NO and XOD, have no influence on the level of H2O2. The findings suggested that dianthrone could play an antioxidation activity by increasing spleen index, decreasing the level of MDA and NO, regulating activities of enzymes involved in production and elimination of free radicals in mice. The results of histopathological sections of immune organs showed that dianthrone has a repair function on the immune suppressed mice liver and spleen, and have a certain recovery on the thymus, but the effect is not obvious.
     2. Effects of dianthrone on T cell surface film molecules and cytokines in serum in mice. The T cell surface film molecules(CD3、CD4、CD8、CD4/CD8) and cytokines (IL-4、IL-6、IL-10、IFN-γ、TNF-α) in serum were measured by ELISA method. The following conclusions to be drawn:dianthrone had functions to increase the T cell surface film molecules(CD3、 CD4、 CD8、 CD4/CD8) and cytokines (IFN-γand TNF-α) significantly, decrease level of IL-4、 IL-6、 IL-10. The findings suggested1dianthrone can increase the number of mature T cells, promote T cells to release cytokines, and regu the activity of Thl cells and Th2cells to increase the body's immune function.
     3. Effects of dianthrone on cAMP/cGMP signaling pathway in rats. The level of cAMP and cGMP were measured by ELISA method, and the ratios of cAMP and cGMP were calculated. The following conclusions to be drawn: dianthrone had functions to increase the level of cAMP significantly, and decrease the level of cGMP and the ratios of cAMP and cGMP. The findings suggested that dianthrone can enhance the differentiation and proliferation of B lymphocytes, and promote the antibody generated to enhance the humoral immune function.
     4. Effects of dianthrone on hypothalamic-pituitary-adrenal axis in rats. The level of ACTH and CORT were measured by ELISA method. The following conclusions to be drawn: dianthrone had functions to decrease the level of ACTH and CORT significantly. The findings suggested that dianthrone can decrease the level of ACTH and CORT to promote T cell transformation, reduce the hypothalamic-pituitary-adrenal axis hyperactivity to weak the dysfunction of hypothalamus, pituitary, adrenal and the effects of immunocompromised caused by HPA axis hyperactivity.
     5. Effects of dianthrone on Neuroendocrine-immune network-related factor in rats.The level of IL-1, DA, NA and5-HT were measured by ELISA method, the following conclusions to be drawn: dianthrone had functions to decrease the level of IL-1, DA, NA and5-HT significantly. The findings suggested that dianthrone can affect the role of vasopressin on adrenal gland, reduce the GC release to alleviate the inhibition of the immune process. Or affect the level of ACTH in pituitary by reducing the level of Adrenal cortical hormone to alleviate the immunosuppressive. Or inhibition the function of B cells and enhanced the by increasing the level of DA torecover the immune function.
     6. Preparation of dianthrone-loaded bovine serum albumin (BSA) clathrate. Used a desolvation-crosslinking method to prepare clathrate, and the prescription process was optimized. Its morphology, particle size distribution and potential distribution were estimated, the yield, encapsulation efficiency and drug loading were determined, the profile of in vitro drug release were assessed. The conditions for dianthrone-loaded bovine serum albumin clathrate preparation were optimized: the amount of albumin was1.5g, crosslinking time was24h, the amount of glutaraldehyde was15μL, pH was9, the dropping speed of ethanol was1.0mL/min. The surface morphology of the clathrate possessed smooth surfaces and spherical without any agglomeration. The mean size of the clathrate was122nm, and the zeta potential of the particles was greater than-50mV. The yield, encapsulation efficiency and drug-loading of the nanoparticles were95.5%,71.43%and4.13%, respectively. The drug release rate was greater than50%of entrapped in the BSA nanoparticles being released within4days, was10%-15%at4d to10d, and little change in drug concentration at10d to the25th day. The desolvation-crosslinking preparation method was a suitable preparation method for dianthrone albumin nanoparticles, the clathrate with a regular and uniform shape, high stability, yield, encapsulation efficiency and drug loading, and excellent controlled-release characteristics.
     7. The conjunction of dianthrone albumin clathrate with IgG antibodies. Dianthrone albui clathrate and IgG antibodies were conjugated by glutaraldehyde method and optimized the conjunct conditions. The results were detected by SDS-PAGE electrophoresis. The conditions for dianthrone albumin clathrate-IgG antibody conjugates preparation were optimized: IgG antibodies and clathrate in the proportion of1:1, amount of Glutaraldehyde were1/4of the total volume of solution. Coupling time were2h, temperature were25℃and pH were neutral. Dianthrone albumin clathrate-IgG antibody conjugates were detected by SDS-PAGE electrophoresis. The results showed that dianthrone albumin clathrate-IgG antibody conjugates had a band near the210kDa, IgG antibody had a band near the150kDa, and dianthrone albumin clathrate had a band near the66kDa. The results were consistent with the theoretically molecular weight of IgG antibodies and dianthrone albumin clathrate. The glutaraldehyde method was a suitable preparation method for dianthrone albumin clathrate-IgG antibody conjugates.
引文
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