CN113637052A - 一种治疗结肠癌的抑癌蛋白及其药物组合物 - Google Patents
一种治疗结肠癌的抑癌蛋白及其药物组合物 Download PDFInfo
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Abstract
本发明涉及一种用于治疗结肠癌抑癌蛋白,所述抑癌蛋白能有效地抑制结肠癌细胞的生长,且其与氟尿嘧啶组合能显著增强后者的抑癌效果。因此,本发明也提供一种治疗结肠癌的药物组合物,组合物包含本发明的抑癌蛋白和氟尿嘧啶。本发明的组合物能够显著抑制结肠癌肿瘤生长,且不存在副作用,具备良好的临床和市场推广价值。
Description
技术领域
本发明涉及生物医药技术领域,具体涉及一种人类抑癌蛋白及其在制备治疗结肠癌的药物组合物中的用途。
背景技术
癌症是严重危害人类健康的恶性疾病,世界卫生组织国际癌症研究机构(IARC)发布的2020年全球最新癌症负担数据看,2020年全球新发癌症病例1929万例,其中中国新发癌症457万人,占全球23.7%,由于中国是世界第一人口大国,癌症新发人数远超世界其他国家。2020年全球癌症死亡病例996万例,其中中国癌症死亡人数300万,占癌症死亡总人数30%,主要由于中国癌症患病人数多,癌症死亡人数位居全球第一。全球发病率前十的癌症分别是:乳腺癌、肺癌、结直肠癌、前列腺癌、胃癌、肝癌、宫颈癌、食管癌、甲状腺癌、膀胱癌。
结肠癌(Colorectal cancer,CRC)是人类高发消化道恶性肿瘤之一,好发于直肠与乙状结肠交界处,其发病率一直呈上升趋势,全球每年患结肠癌的病例超过1亿人,在全球恶性肿瘤发病率中已上升至第三位,其死亡率居恶性肿瘤死因的第二位。结肠癌以40~50岁年龄组发病率最高,男女之比为2~3:1。目前,结肠癌的治疗手段以手术治疗为主,辅以全身或局部化疗、放疗等治疗手段,但现有药物通常具有毒副作用较大、药物用量大、容易产生后天耐药性等缺点,这会对患者的治疗造成影响。近些年,生物药在肿瘤治疗领域逐渐成为热点,如利用抑癌蛋白的生物靶向治疗。利用抑癌基因来治疗或辅助治疗癌症的基因治疗方法逐渐成为一大研究方向。在抑癌基因通过其产物-抑癌蛋白抑制癌基因的表达达到治疗癌症的目的。抑癌蛋白的作用靶向性强,对正常细胞没有影响,并且效果较理想,因此抑癌蛋白、基因是一种很有发展前途的在肿瘤抑制药物和生物制剂中的用途。
发明内容
本发明的目的是提供一种抑癌蛋白,该蛋白能有效地抑制结肠癌的生长,尤其与氟尿嘧啶联合使用,更能取得优异的治疗效果。
本发明的另一目的在于提供一种用于治疗结肠癌的药物组合物,所述药物组合物中包含本发明的抑癌蛋白,优选进一步包含氟尿嘧啶和抑癌蛋白的组合。
本发明还涉及一种结肠癌治疗方法,所述方法包括给予患者施用有销量的抑癌蛋白或包含所述抑癌蛋白的药物组合物。
本发明所述的抑癌蛋白序列如SEQ ID NO.1所示。
本发明具体提供如下技术方案:
本发明提供一种用于治疗结肠癌的抑癌蛋白,所述抑癌蛋白能有效地抑制结肠癌的生长,其氨基酸序列如SEQ ID NO.1所示。
本发明提供一种用于治疗结肠癌的药物组合物,所述药物组合物包含本发明的抑癌蛋白,所述抑癌蛋白的氨基酸序列如SEQ ID NO.1所示。
本发明提供一种抑癌蛋白在制备治疗结肠癌的药物组合物中的用途,所述抑癌蛋白的氨基酸序列如SEQ ID NO.1所示。
优选地,本发明的药物组合物还含有氟尿嘧啶,所述氟尿嘧啶与抑癌蛋白的重量比为1:10-2:1,更优选地,两者的比例为1:1。
本发明的抑癌蛋白是本申请发明人在前期筛选获得的一种能够与乙型肝炎病毒(HBV)的X蛋白(HBx)相互作用的蛋白A的突变体。蛋白A是本申请发明人以乙型肝炎病毒(HBV)的X蛋白(HBx)作为诱饵,通过酵母双杂交技术筛选得到的一种蛋白,在该蛋白虽然具备一定的抑癌作用,但作用较弱,在对其进行突变研究过程中,发明人得到本申请的抑癌蛋白,本申请的抑癌蛋白不仅单独使用具备一定的抑制癌细胞作用,申请人更是意外发现,本发明的抑癌蛋白更是能显著增强氟尿嘧啶的抑癌作用。本发明的抑癌蛋白的氨基酸序列如SEQ ID NO.1所示。
本发明的抑癌蛋白通过构建重组表达大肠杆菌制备得到,具体方法为:合成表达SEQ ID NO.1所示抑癌蛋白的编码基因,将所述编码基因克隆插入到原核表达载体pET28a上得到抑癌蛋白的原核表达载体,表达载体然后转化大肠杆菌BL21,筛选阳性克隆并测序验证。将筛选到的阳性菌株培养纯化得到抑癌蛋白。
具体实施方式
下面结合实施例对本发明作进一步详细的说明。以下实施例仅用于说明本发明而不用于限制本发明的范围。实施例中未注明具体条件的实验方法,通常按照常规条件,或按照制造厂商所建议的条件。
实施例1:抑癌蛋白的制备和纯化
(1)抑癌蛋白的原核表达载体的构建:根据SEQ ID NO.1所示氨基酸序列,设计其并合成其编码序列,将其克隆到原核表达载体pET28a上得到原核表达载体,构建的原核表达载体然后转化大肠杆菌BL21,筛选阳性克隆并测序,证实构建的重组大肠杆菌BL21表达的即为SEQ ID NO.1所示的抑癌蛋白。
(2)抑癌蛋白的制备和纯化:将上述构建的重组菌株接种于浓度为50μg/ml的氨苄抗菌素的液体培养基中,37℃振荡培养至600nm吸光度值为1.5~2,IPTG(浓度为0.5mol/L)诱导表达,37℃振荡培养5小时,6000转/分钟离心15分钟收集菌体,超声破碎1-2分钟,10000转/分钟离心6分钟,弃上清,沉淀用磷酸盐缓冲液(pH7.5)重悬,再10000转/分钟离心6分钟,弃上清取沉淀,如此反复洗涤3次,即得到纯化抑癌蛋白。上述过程中液体培养基为:1升水中溶解蛋白胨15g,酵母提取物6g,NaCl 6g。
实施例2:抑癌蛋白抗肿瘤活性分析(抑瘤实验)
(1)实验动物、细胞及耗材
BALB/c品系裸鼠,6-8周齢,雌性,体重在16-18g之间;HCT116细胞系;生理盐水;0.4mm无菌注射针。
(2)HCT-116结肠癌裸鼠模型的构建
SPF级条件下,将健康的裸鼠于层流架中喂养3-6天,对裸鼠皮肤使用酒精进行多次擦拭消毒,用注射器将富集的HCT116细胞注入裸鼠右前肢腋下,每只注射1.2x107个细胞,每日观察小鼠情况,确认成瘤状况,并记录每日肿瘤大小,选取肿瘤生长至4-6mm的荷瘤小鼠进行实验。
(3)抑癌蛋白抑瘤实验
选择48只荷瘤小鼠,平均分为4组进行通过尾静脉注射的方式给予本申请抑癌蛋白的治疗,其中一组注射生理盐水(0.1L/kg)作为对照组,实验组按注射剂量分为三组(20mg/kg、50mg/kg、100mg.kg),连续治疗4周,每周注射一次,各组均未出现显著的不良反应。实验结束后,将小鼠处死后解剖,分离肿瘤组织并称重,通过与对照组对比后计算出肿瘤抑制率。具体结果如下表1:
样本量(只) | 肿瘤平均重量(g) | 肿瘤抑制率(%) | |
对照组 | 12 | 2.03 | |
实验组1(10mg/kg) | 12 | 1.56 | 23.2 |
实验组2(50mg/kg) | 12 | 0.93 | 54.2 |
实验组3(100mg/kg) | 12 | 0.91 | 55.2 |
由上表实验结果可见,本申请抑癌蛋白能够有效抑制结肠癌肿瘤生长,肿瘤抑制效率高至55.2%。
实施例3:抑癌蛋白和氟尿嘧啶抗肿瘤活性分析(抑瘤实验)
实验动物、细胞及耗材及HCT-116结肠癌裸鼠模型的构建同实施例1
实验方法:
选择72只荷瘤小鼠,平均分为6组进行通过尾静脉注射的方式进行治疗,其中一组注射生理盐水(0.1L/kg)作为对照组,实验组按注射剂量分为5组,分别为氟尿嘧啶高剂量组(25mg/kg)、氟尿嘧啶低剂量组(20mg/kg)、混合组1(氟尿嘧啶20mg/kg+抑癌蛋白20mg/kg)、混合组2(氟尿嘧啶20mg/kg+抑癌蛋白50mg/kg)、混合组3(氟尿嘧啶20mg/kg+抑癌蛋白100mg/kg),连续治疗4周,每周注射一次,各组均未出现显著的不良反应。实验结束后,将小鼠处死后解剖,分离肿瘤组织并称重,通过与对照组对比后计算出肿瘤抑制率。具体结果如下表2:
根据本实验结果可知,氟尿嘧啶组高剂量与低剂量之间几乎无差异,混合组之间差异较小,但氟尿嘧啶与本申请抑癌蛋白组合的抑癌率达到惊人的83.9%,而所有实验小鼠未见明显不良反应。说明本发明的抑癌蛋白能够有效抑制结肠癌细胞生长,其与氟尿嘧啶组合使用的效果更加优异。
序列表
<110> 牡丹江医学院
<120> 一种治疗结肠癌的抑癌蛋白及其药物组合物
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Claims (5)
1.一种用于治疗结肠癌的抑癌蛋白,其特征在于:所述抑癌蛋白的氨基酸序列如SEQID NO.1所示。
2.一种用于治疗结肠癌的药物组合物,所述药物组合物包含权利要求1所述的抑癌蛋白。
3.根据权利要求2所述的药物组合物,其特征在于:所述药物组合物还含有氟尿嘧啶。
4.权利要求2-3任意一项所述的药物组合物,其特征在于:所述药物组合物中氟尿嘧啶与抑癌蛋白的重量比为1:10-2:1。
5.根据权利要求4所述的药物组合物,其特征在于:所述药物组合物中氟尿嘧啶与抑癌蛋白的重量比为1:1。
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肖鸿敏;任建林;潘金水;施华秀;许鸿志;周飞;董菁;: "乙型肝炎病毒前-X融合蛋白结合蛋白的筛选", 中国肝脏病杂志(电子版), no. 02 * |
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陈芸;王小众;: "HBV X蛋白与氧化应激的相关性", 胃肠病学和肝病学杂志, no. 02 * |
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