CN109674800A - 白桦酯酸在制备用于治疗肺纤维化疾病的药物中的应用 - Google Patents
白桦酯酸在制备用于治疗肺纤维化疾病的药物中的应用 Download PDFInfo
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- Engineering & Computer Science (AREA)
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Abstract
本发明提供了一种白桦酯酸在制备用于治疗肺纤维化疾病的药物中的应用,其中,白桦酯酸的结构如下式(I)所示:(I)。本发明的研究表明,白桦酯酸对肺纤维化有良好的功效,无不良反应,可减缓博莱霉素诱导的小鼠肺纤维化在治疗、缓解或改善肺纤维化疾病方面具有良好的应用前景。
Description
技术领域
本发明属于药物化学技术领域,尤其是涉及一种白桦酯酸在制备用于治疗肺纤维化疾病的药物中的应用。
背景技术
肺纤维化是多种间质性肺疾病(interstitial lung diseases,ILDs)的最后阶段,其特征是持续的肺泡上皮损伤和失调的修复,导致肌成纤维细胞积聚和细胞外基质和结缔组织的过度沉积。。特发性肺纤维化(idiopathic pulmonary fibrosis,IPF)是最常见的弥漫性肺纤维化疾病,至今病因不明、发病机制不清、缺乏有效的治疗手段,中位生存期仅3-5年。传统观点认为IPF是由慢性炎症引起,然而活组织检查没有显示明显炎症,在疾病早期也很少有突出的炎症迹象,并且临床上抗炎治疗收效甚微。该病好发于50~70岁,特别是有过吸烟史的人群,男性高于女性。随着大气的污染、环境的恶化,流行病学资料报告显示近年来发病率有上升趋势。目前统计IPF的发病率为6.8-16.3/10万,患病率为14-42.7/10万,近年来患病人群呈不断上升趋势。患病人数全球保守估计5000万,预计我国有IPF患者60万左右。每年IPF死亡病例达40000例。
近年来,针对IPF的临床试验药物包括糖皮质激素、秋水仙碱、环孢素A、乙酰半胱胺酸、波生坦、依那西普、抗凝剂、吡非尼酮及伊马替尼等等,但IPF患者对激素和各种药物的治疗反应普遍较差,目前尚无能确切改善患者最终预后的药物,美国胸科医师学会(ATS)的IPF指南中指出,IPF病人到病情晚期唯一值得推荐且有效的治疗便为肺移植,但由于手术治疗费用昂贵、技术程度复杂、供者肺组织来源紧缺、器官移植伦理学及医疗法律法规不健全等因素的存在,限制了肺移植作为IPF患者治疗方法在我国的开展。
目前针对该病的上市药物只有两个,分别是罗氏的吡非尼酮和勃林格殷格翰的尼达尼布,但都不能有效提高患者生存期,治疗费用高,且临床需求远未得到满足。因此阐明肺纤维化的发生发展机制,探索新的潜在的药物靶点,开发出针对肺纤维化的疗效确认、相对安全、价格合理的药物具有重要的社会意义和医学意义。
白桦酯酸(Betulinic acid)是五环三萜类化合物,广泛分布于多种植物中,如五加科(刺五加),桦木科(白桦外皮),柿科(白黑柿叶),大戟科(重阳木叶)等,也可以用白桦脂醇为原料通过化学合成得到。白桦酯酸及其衍生物具有化学结构简单,药理活性强,作用机制特异,相对分子质量较小等特点。药理学研究表明白桦酯酸具有抗HIV、抗肿瘤、抗炎、抗溃疡等作用,目前已作为抗真菌药物广泛使用。但截至目前,尚无白桦酯酸可减缓特发性肺纤维化的相关报道。
发明内容
有鉴于此,本发明旨在提出一种治疗肺纤维化疾病的药物。
为达到上述目的,本发明的技术方案是这样实现的:
白桦酯酸在制备用于治疗肺纤维化疾病的药物中的应用,所述白桦酯酸的结构如下式(I)所示:
优选的,所述肺纤维化疾病为特发性肺纤维化疾病。
优选的,所述白桦酯酸的剂量为5mg/kg~150mg/kg。
优选的,所述药物的剂型选自片剂、胶囊剂、丸剂、栓剂、气雾剂、口服液体制剂、颗粒剂、散剂、注射剂、糖浆剂、酒剂、酊剂、露剂、膜剂或它们的组合。
本发明还提供了一种治疗肺纤维化疾病的药物,包括白桦酯酸或白桦酯酸在药学上可接受的辅料,以及白桦酯酸在药学上可接受的盐、酯、水合物中的一种以及两者以上。
优选的,所述肺纤维化疾病为特发性肺纤维化疾病。
优选的,所述白桦酯酸在药学上可接受的盐包括有机盐和无机盐。
优选的,所述有机盐包括甲磺酸盐、甲酸盐、乙酸盐、三氟乙酸盐、马来酸盐、酒石酸盐、琥珀酸盐、富马酸盐、柠檬酸盐、苯磺酸盐、对甲基苯磺酸盐、萘磺酸盐、乳酸盐和苯甲酸盐的一种或两种以上;所述无机盐包括盐酸盐、氢溴酸盐、硫酸盐和磷酸盐的一种或两种以上。
优选的,所述药物的给药方式包括口服、注射、植入、外用、喷雾、吸入或它们的组合。
相对于现有技术,本发明所述的白桦酯酸在制备用于治疗肺纤维化疾病的药物中的应用具有以下优势:
本发明的研究表明,白桦酯酸对肺纤维化有良好的功效,无不良反应,可减缓博莱霉素诱导的小鼠肺纤维化,在治疗、缓解或改善肺纤维化疾病方面具有良好的应用前景。
附图说明
图1是各组小鼠的体重变化曲线;
图2是各组小鼠肺部的胶原含量;
图3是各组小鼠肺纤维化面积;
图4是各组小鼠肺纤维化比例柱形图。
具体实施方式
除有定义外,以下实施例中所用的技术术语具有与本发明所属领域技术人员普遍理解的相同含义。以下实施例中所用的试验试剂,如无特殊说明,均为常规生化试剂;所述实验方法,如无特殊说明,均为常规方法。
下面结合实施例及附图来详细说明本发明。
本发明提供了一种白桦酯酸在制备用于治疗肺纤维化疾病的药物中的应用,其中,白桦酯酸的结构如下式(I)所示:
实施例1
白桦酯酸对博莱霉素诱导的小鼠特发性肺纤维化的影响
肺纤维化动物模型制备:取C57BL/6J,(周龄8-10周)野生型小鼠,将质量分数为10%水合氯醛以0.5mL/100g(体重)给予小鼠腹腔注射麻醉,气管内有创注射2U/Kg博莱霉素。
分组情况:
空白对照组(氯化钠组)注射同体积的生理盐水(质量分数为0.9%Nacl),每日记录小鼠体重,绘制体重变化曲线。
模型组:在博莱霉素处理第7至14天时,每天通过灌胃给予小鼠相应溶剂羧甲基纤维素钠;
白桦酯酸治疗组:在博莱霉素处理第7至14天时,每天通过灌胃给予小鼠10mg/kg白桦酯酸。
第14天时检测肺胶原含量及纤维化严重程度。各组每日记录小鼠体重,绘制体重变化曲线。
表1各组小鼠的体重变化表格
肺胶原含量检测(即羟脯氨酸含量测定):在博莱霉素注射第14天处死小鼠,分离小鼠右肺,放入5mL安培瓶,120℃烘箱烘干,加入3ml浓度为12mol/L的盐酸,120℃下水解6小时,水解后用浓度为10mol/L的NaOH调整pH至6.5-8.0,使用孔径为5μm的过滤器过滤残渣,得滤液,滤液中加入PBS(磷酸盐缓冲溶液)调整总体积为10mL,得到样品A;取50μL样品A,加入350μL去离子水,加入200mL浓度为1.41%的氯胺T(Chloramine T)溶液,室温孵育20分钟,加入200μL浓度为18.9%的高氯酸溶液(perchloric acid,室温孵育5分钟,加入200μL浓度为浓度为20%的对二甲氨基苯甲醛(P-DMAB)溶液,65℃孵育20分钟,得到样品B;取200μL样品B至96孔板中测定样品B在570nm波长处的吸光值,利用L-羟脯氨酸标准品(Sigma)的浓度与吸光度为横纵坐标,绘制标准曲线,依据标准曲线对应的回归方程,计算所测样品羟脯氨酸的浓度。
表2各组小鼠肺部的胶原含量表格
对肺组织切片进行纤维化面积定量统计:将小鼠肺经过多聚甲醛固定、常规脱水、石蜡包埋、切片、H&E(苏木素伊红)染色、中性树胶封片处理后,应用正置显微镜采集HE染色图像数据,每张切片随机选取十个视野,使用Image-Pro Plus 6.0软件对肺纤维化面积进行统计。
表3各组小鼠肺纤维化比例表格
实验结果如下图1至图4所示,由图1可知,白桦酯酸治疗组自给药后小鼠体重保持平稳,而羧甲基纤维素钠组体重一直下降,表明白桦酯酸可以改善动物健康状况;由图2可知,与给予模型组的小鼠相比,白桦酯酸治疗组小鼠的肺组织中羟脯氨酸含量明显降低,表明白桦酯酸能够减轻博莱霉素所诱导的胶原含量,抑制博莱霉素诱导的肺组织中胶原的合成,并且p<0.05,即统计学上具有显著性差异;并且由图3和图4可知,H&E染色观察和统计分析表明白桦酯酸治疗组的小鼠肺纤维化程度明显低于模型组小鼠,表明白桦酯酸可有效减缓博莱霉素诱导的小鼠肺纤维化。
综上,白桦酯酸对肺纤维化有良好的功效,无不良反应,可减缓博莱霉素诱导的小鼠肺纤维化,在治疗、缓解或改善肺纤维化疾病方面具有良好的应用前景。
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (9)
1.白桦酯酸在制备用于治疗肺纤维化疾病的药物中的应用,其特征在于:所述白桦酯酸的结构如下式(I)所示:
2.根据权利要求1所述的白桦酯酸在制备用于治疗肺纤维化疾病的药物中的应用,其特征在于:所述肺纤维化疾病为特发性肺纤维化疾病。
3.根据权利要求1所述的白桦酯酸在制备用于治疗肺纤维化疾病的药物中的应用,其特征在于:所述白桦酯酸的剂量为5mg/kg~150mg/kg。
4.根据权利要求1所述的白桦酯酸在制备用于治疗肺纤维化疾病的药物中的应用,其特征在于:所述药物的剂型选自片剂、胶囊剂、丸剂、栓剂、气雾剂、口服液体制剂、颗粒剂、散剂、注射剂、糖浆剂、酒剂、酊剂、露剂、膜剂或它们的组合。
5.一种治疗肺纤维化疾病的药物,其特征在于:包括白桦酯酸或白桦酯酸在药学上可接受的辅料,以及白桦酯酸在药学上可接受的盐、酯、水合物中的一种以及两者以上。
6.根据权利要求5所述的治疗肺纤维化疾病的药物,其特征在于:所述肺纤维化疾病为特发性肺纤维化疾病。
7.根据权利要求5所述的治疗肺纤维化疾病的药物,其特征在于:所述白桦酯酸在药学上可接受的盐包括有机盐和无机盐。
8.根据权利要求7所述的治疗肺纤维化疾病的药物,其特征在于:所述有机盐包括甲磺酸盐、甲酸盐、乙酸盐、三氟乙酸盐、马来酸盐、酒石酸盐、琥珀酸盐、富马酸盐、柠檬酸盐、苯磺酸盐、对甲基苯磺酸盐、萘磺酸盐、乳酸盐和苯甲酸盐的一种或两种以上;所述无机盐包括盐酸盐、氢溴酸盐、硫酸盐和磷酸盐的一种或两种以上。
9.根据权利要求5所述的治疗肺纤维化疾病的药物,其特征在于:所述药物的给药方式包括口服、注射、植入、外用、喷雾、吸入或它们的组合。
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