CN112168820B - Application of SRCAP ATPase inhibitor in colorectal cancer treatment - Google Patents
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Abstract
Description
技术领域Technical field
本发明提供了SRCAP ATPase抑制剂抑制结直肠癌干细胞的应用。The present invention provides the use of SRCAP ATPase inhibitors to inhibit colorectal cancer stem cells.
背景技术Background technique
肠道上皮细胞覆盖肠道整个表面,在体内发挥营养吸收、黏膜屏障、分泌及免疫调节等诸多重要功能,维持机体的动态平衡。肠上皮由快速增殖的肠隐窝及分化的绒毛构成基本的组织结构,分布有肠道干细胞(intestine stem cell,ISC)、潘氏细胞及增殖细胞组成的隐窝,还包括吸收上皮细胞、杯状细胞、内分泌细胞及Tuft细胞。生理条件下ISC的自我更新与多能性分化维持了肠上皮稳态。病理状态则会导致上皮功能的严重障碍。ISC位于肠隐窝底部并与邻近作为微环境的潘氏细胞紧密联系。目前已经知道微环境可提供Wnt/β-catenin、Notch、BMP、ErbB及Hedgehog等信号支持ISC的自我更新与分化。隐窝底端Lgr5+细胞作为活化的ISC,活性主要受Wnt等信号调控,以维持生理状态下的肠道稳态。Intestinal epithelial cells cover the entire surface of the intestine and perform many important functions in the body such as nutrient absorption, mucosal barrier, secretion and immune regulation, maintaining the body's dynamic balance. The intestinal epithelium consists of rapidly proliferating intestinal crypts and differentiated villi, which constitute the basic tissue structure. Crypts composed of intestinal stem cells (ISCs), Paneth cells and proliferating cells are distributed in the intestinal epithelium. It also includes absorptive epithelial cells, cup cells, endocrine cells and Tuft cells. The self-renewal and pluripotent differentiation of ISCs maintain intestinal epithelial homeostasis under physiological conditions. Pathological conditions can lead to severe disorders of epithelial function. ISCs are located at the bottom of intestinal crypts and are in close contact with Paneth cells that serve as the adjacent microenvironment. It is now known that the microenvironment can provide Wnt/β-catenin, Notch, BMP, ErbB and Hedgehog signals to support the self-renewal and differentiation of ISCs. Lgr5 + cells at the bottom of the crypt are activated ISCs, and their activity is mainly regulated by signals such as Wnt to maintain intestinal homeostasis under physiological conditions.
结直肠癌是西方国家常见肿瘤。伴随经济社会发展及生活方式改变,我国每年新发病例和死亡病例均占全世界同期结直肠癌病例的20%。结直肠癌是北京市最为常见消化道恶性肿瘤。10年间发病率由27.42/10万上升至39.93/10万。肿瘤干细胞的存在已经在白血病及乳腺癌、结肠癌等多种实体肿瘤中证实。肿瘤干细胞具有自我更新和多向分化能力,在肿瘤细胞中占比极少,但与肿瘤复发、转移、耐药及治疗失败密切相关。肠癌干细胞起源问题目前仍是领域内争论的焦点,有研究认为正常干细胞突变可导致肠上皮组织结构功能异常和内部环境失稳,从而有发展为结肠癌的潜能。Lgr5是G蛋白偶联受体家族蛋白。其既可以作为肠道干细胞标志物参与细胞的分化,也是重要的肠癌干细胞标志物。同时,结肠癌干细胞涉及Wnt信号、PI3K/AKT信号、受体酪氨酸激酶Ras-MAPK通路等,这些通路也与正常干细胞的增殖和分化相关。Colorectal cancer is a common tumor in Western countries. With economic and social development and lifestyle changes, new cases and deaths in my country each year account for 20% of colorectal cancer cases in the world during the same period. Colorectal cancer is the most common malignant tumor of the digestive tract in Beijing. The incidence rate increased from 27.42/100,000 to 39.93/100,000 in 10 years. The existence of cancer stem cells has been confirmed in leukemia and various solid tumors such as breast cancer and colon cancer. Cancer stem cells have the ability of self-renewal and multi-directional differentiation. They account for a very small proportion of tumor cells, but they are closely related to tumor recurrence, metastasis, drug resistance and treatment failure. The origin of intestinal cancer stem cells is still a focus of debate in the field. Some studies believe that mutations in normal stem cells can lead to abnormal structure and function of intestinal epithelial tissue and instability of the internal environment, thereby having the potential to develop colon cancer. Lgr5 is a G protein-coupled receptor family protein. It can be used as an intestinal stem cell marker to participate in cell differentiation, and is also an important intestinal cancer stem cell marker. At the same time, colon cancer stem cells involve Wnt signaling, PI3K/AKT signaling, and the receptor tyrosine kinase Ras-MAPK pathway. These pathways are also related to the proliferation and differentiation of normal stem cells.
染色质重塑复合物是一类依赖DNA的具有ATPase活性的类解螺旋酶蛋白复合体,是表观遗传调控的重要组分。在干细胞自我更新、细胞命运决定及重编程过程中发挥着重要的调节作用。染色质重塑复合物主要包括SWI/SNF、CHD、ISWI及INO80等4个蛋白家族。由染色质重塑酶SRCAP、Ruvbl1、YL-1、Arp6等11个亚基组成的SRCAP复合物也属于INO80家族,其染色质重塑活性主要是催化组蛋白变体H2A.Z置换经典组蛋白H2A形成核小体,调控基因转录开放。SRCAP基因突变导致遗传疾病Floating-Harbor综合征,全长蛋白由HSA、ATP酶、CBP结合、SANT等结构域组成。SRCAP所调控的组蛋白变体H2A.Z在胚胎干细胞自我更新过程中作用于Oct4/MLL/PRC2调控了干性基因的表达,在成体发育过程中参与调控肌肉细胞分化及造血干细胞分化等关键基因的表达。SRCAP复合物活性调控对Lgr5+肠癌干细胞的作用至今尚未被确定。The chromatin remodeling complex is a type of DNA-dependent helicase-like protein complex with ATPase activity and is an important component of epigenetic regulation. It plays an important regulatory role in stem cell self-renewal, cell fate determination and reprogramming. Chromatin remodeling complexes mainly include four protein families, including SWI/SNF, CHD, ISWI and INO80. The SRCAP complex, composed of 11 subunits including chromatin remodeling enzymes SRCAP, Ruvbl1, YL-1, and Arp6, also belongs to the INO80 family. Its chromatin remodeling activity mainly catalyzes the replacement of classic histones by histone variant H2A.Z. H2A forms nucleosomes and regulates gene transcription. SRCAP gene mutations cause the genetic disease Floating-Harbor syndrome. The full-length protein consists of HSA, ATPase, CBP binding, SANT and other domains. The histone variant H2A.Z regulated by SRCAP acts on Oct4/MLL/PRC2 to regulate the expression of stemness genes during the self-renewal process of embryonic stem cells, and participates in the regulation of key genes such as muscle cell differentiation and hematopoietic stem cell differentiation during adult development. expression. The role of regulation of SRCAP complex activity in Lgr5 + intestinal cancer stem cells has not yet been determined.
Amtizole,中文名1,2,4-噻二唑-3,5-二胺,CAS#:34283-30-2,英文化学名称:1,2,4-Thiadiazole-3,5-diamine,分子式:C2H4N4S。Amtizole为已知抗氧化剂和Na+/K+ATPase抑制剂。该化和物对其他ATPase活性的抑制作用,对Lgr5+肠癌干细胞自我更新及结直肠癌的调控作用尚没有报道。Amtizole, Chinese name: 1,2,4-Thiadiazole-3,5-diamine, CAS#:34283-30-2, English chemical name: 1,2,4-Thiadiazole-3,5-diamine, molecular formula: C 2 H 4 N 4 S. Amtizole is a known antioxidant and Na+/K+ATPase inhibitor. The inhibitory effect of this compound on other ATPase activities and its regulatory effect on the self-renewal of Lgr5 + intestinal cancer stem cells and colorectal cancer have not been reported.
发明内容Contents of the invention
本发明试图探索Lgr5+肠癌干细胞自我更新与SRCAP ATPase活性之间的关系,并试图探索小分子化合物Amtizole及其可能的每一种活性修饰产物对结直肠癌的治疗作用,从而为疾病治疗提供更为便利的方法。尽管在理解Lgr5+肠癌干细胞自我更新及结直肠癌的机制方面已经取得了巨大进展,但是仍然需要确定特异性通路和作为可药用靶标的活化Lgr5+肠癌干细胞自我更新的蛋白质,从而为治疗由其介导的结直肠癌提供新途径。本发明实现了这个和相关需求。The present invention attempts to explore the relationship between the self-renewal of Lgr5 + intestinal cancer stem cells and SRCAP ATPase activity, and attempts to explore the therapeutic effect of the small molecule compound Amtizole and each of its possible active modification products on colorectal cancer, thereby providing information for disease treatment. More convenient method. Although great progress has been made in understanding the mechanisms of Lgr5 + intestinal cancer stem cell self-renewal and colorectal cancer, there is still a need to identify specific pathways and proteins that activate Lgr5 + intestinal cancer stem cell self-renewal as druggable targets to provide Provides new avenues for treatment of colorectal cancer mediated by it. The present invention fulfills this and related needs.
因此,本发明提供以下各项:Accordingly, the present invention provides the following:
1.SRCAP ATPase酶活性或其调控的下游转录因子的抑制剂/拮抗剂在制备用于预防或治疗哺乳动物的结直肠癌疾病的药物/试剂盒中的应用。1. Application of inhibitors/antagonists of SRCAP ATPase enzyme activity or downstream transcription factors regulated by it in the preparation of drugs/kits for preventing or treating colorectal cancer in mammals.
2.根据以上1所述的应用,其中所述下游转录因子为PPARδ分子。2. The application according to 1 above, wherein the downstream transcription factor is a PPARδ molecule.
3.根据以上1或2所述的应用,其中所述抑制剂/拮抗剂为单克隆/多克隆抗体、反义RNA或小分子化合物抑制剂。3. The application according to 1 or 2 above, wherein the inhibitor/antagonist is a monoclonal/polyclonal antibody, antisense RNA or small molecule compound inhibitor.
4.根据以上1-3中任一项所述的应用,其中所述抑制剂/拮抗剂为Amtizole或其前体或衍生物,其中所述前体或衍生物保留Amtizole的SRCAP ATPase酶活性的抑制剂/拮抗剂活性。4. The application according to any one of 1-3 above, wherein the inhibitor/antagonist is Amtizole or a precursor or derivative thereof, wherein the precursor or derivative retains the SRCAP ATPase activity of Amtizole. Inhibitor/antagonist activity.
5.根据以上4所述的应用,其中所述Amtizole或其前体或衍生物具有以下式(I)的结构,5. The application according to the above 4, wherein the Amtizole or its precursor or derivative has the structure of the following formula (I),
其中:in:
式(I)上任选的修饰基团独立地选自:C1-C12烷基(如C1-C6烷基)、C1-C6亚烷基、C2-C12烯基(如C3-C6烯基)、C3-C10环烷基、苯基、取代的苯基、任选取代的五或六元杂芳基、或C6-C10芳烷基、卤素、-OH、-O-Ra、C4-C12二烯基、C6-C12三烯基、C8-C12四烯基、C6-C10芳基(任选地被独立地选自C1-C6烷基、卤素、C1-C6烷氧基、或羟基的一、二、或三个取代基取代)、C1-C10烷氧基、羧基、氰基、C1-C10烷酰氧基、C1-C10烷硫基、C1-C10烷基磺酰基、C1-C10烷氧基羰基、C1-C10烷酰氨基、-S-Rb、-SO2Rc、-NHSO2Rd和-NHCO2Re;其中Ra、Rb、Rc、Rd、和Re独立地是被选自C1-C6烷基、C6-C10芳基、C1-C6烷氧基、卤素、和羟基杂芳基的一至三个基团取代的C1-C6烷基、C2-C6烯基、C3-C10环烷基、苯基或萘基,所述羟基杂芳基含有独立地选自硫、氮、和氧的一至五个杂原子。Optional modifying groups on formula (I) are independently selected from: C 1 -C 12 alkyl (such as C 1 -C 6 alkyl), C 1 -C 6 alkylene, C 2 -C 12 alkenyl (such as C 3 -C 6 alkenyl), C 3 -C 10 cycloalkyl, phenyl, substituted phenyl, optionally substituted five- or six-membered heteroaryl, or C 6 -C 10 aralkyl, Halogen, -OH, -OR a , C 4 -C 12 dienyl, C 6 -C 12 trienyl, C 8 -C 12 tetraenyl, C 6 -C 10 aryl (optionally independently One, two or three substituents selected from C 1 -C 6 alkyl, halogen, C 1 -C 6 alkoxy, or hydroxyl), C 1 -C 10 alkoxy, carboxyl, cyano, C 1 -C 10 alkanoyloxy, C 1 -C 10 alkylthio, C 1 -C 10 alkylsulfonyl, C 1 -C 10 alkoxycarbonyl, C 1 -C 10 alkanoyl amino, -SR b , -SO 2 R c , -NHSO 2 R d and -NHCO 2 Re ; wherein R a , R b , R c , R d , and Re are independently selected from C 1 -C 6 alkyl, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 3 substituted with one to three groups of C 6 -C 10 aryl, C 1 -C 6 alkoxy , halogen, and hydroxyheteroaryl -C 10 cycloalkyl, phenyl, or naphthyl, the hydroxyheteroaryl containing one to five heteroatoms independently selected from sulfur, nitrogen, and oxygen.
6.根据以上1-5中任一项所述的应用,其中所述哺乳动物为人、小鼠或家畜,如猫、狗、猪、牛、绵羊、山羊、马和兔。6. The application according to any one of 1-5 above, wherein the mammal is a human, a mouse or a domestic animal, such as a cat, a dog, a pig, a cow, a sheep, a goat, a horse and a rabbit.
7.根据以上1-6中任一项所述的应用,其中所述结直肠癌疾病是结肠癌或直肠癌。7. Use according to any one of 1-6 above, wherein the colorectal cancer disease is colon cancer or rectal cancer.
8.用于检测SRCAP ATPase酶活性或其调控的下游转录因子的表达水平的试剂在制备用于诊断或预后哺乳动物的结直肠癌疾病的诊断剂/试剂盒中的应用。8. Application of reagents for detecting SRCAP ATPase enzyme activity or the expression level of downstream transcription factors regulated by it in the preparation of diagnostic agents/kits for diagnosing or prognosticating colorectal cancer in mammals.
9.根据以上8所述的应用,其中所述哺乳动物为人、小鼠或家畜,如猫、狗、猪、牛、绵羊、山羊、马和兔。9. The application according to 8 above, wherein the mammal is a human, a mouse or a domestic animal, such as a cat, a dog, a pig, a cow, a sheep, a goat, a horse and a rabbit.
10.根据以上8或9所述的应用,其中所述结直肠癌疾病是结肠癌或直肠癌。10. Use according to 8 or 9 above, wherein the colorectal cancer disease is colon cancer or rectal cancer.
附图说明Description of the drawings
图1中A至K所示的结果证明了SRCAP能够促进结直肠癌发生及肠癌干细胞自我更新。具体地,图1,A所示为人结直肠癌组织芯片上观察到SRCAP在人正常结直肠上皮细胞低表达,而在结直肠癌肿瘤高表达,并随肿瘤演进过程表达不断升高。图1,B所示为SRCAP在结直肠癌不同分期分级中的表达统计。图1,C所示为SRCAP表达与生存期分析,显示SRCAP高表达病人结直肠癌预后差。图1,D所示为在SRCAP敲低的HCT116上,肿瘤干细胞体外成球能力收到抑制。图1,E所示为SRCAP敲低HCT116细胞体内皮下成瘤能力显著降低。图1,F所示为Srcap在肠道Lgr5+干细胞中特异性基因敲除小鼠构建策略。图1,G所示为Srcap在肠道Lgr5+干细胞中特异性基因敲除小鼠基因型PCR鉴定结果。图1,H所示为应用抗SRCAP蛋白抗体在免疫印迹实验中证明SRCAP蛋白在小鼠肠道Lgr5+干细胞中实现了特异性敲除。图1,I所示为在硫酸葡聚糖钠(Dextran Sulfate,sodium,DSS)/化学诱变剂偶氮甲烷(azoxymethane,AOM)诱导的小鼠结直肠癌模型中,在肠道的组织特异性Srcap敲除小鼠形成肿瘤的数量显著降低。图1,J所示为Srcap敲除鼠诱导结直肠癌生存率提高。图1,K所示为Srcap在肠道的组织特异性敲除小鼠形成肿瘤的数量显著降低。The results shown from A to K in Figure 1 demonstrate that SRCAP can promote colorectal carcinogenesis and intestinal cancer stem cell self-renewal. Specifically, as shown in Figure 1, A, it was observed on the human colorectal cancer tissue chip that SRCAP is lowly expressed in human normal colorectal epithelial cells, but highly expressed in colorectal cancer tumors, and the expression continues to increase with the progression of the tumor. Figure 1, B shows the expression statistics of SRCAP in different stages and grades of colorectal cancer. Figure 1, C shows the analysis of SRCAP expression and survival, showing that patients with high SRCAP expression of colorectal cancer have a poor prognosis. Figure 1, D shows that on SRCAP knockdown HCT116, the ability of tumor stem cells to form spheres in vitro is inhibited. Figure 1, E shows that SRCAP knockdown HCT116 cells significantly reduced the subcutaneous tumor-forming ability in vivo. Figure 1, F shows the strategy for constructing Srcap-specific gene knockout mice in intestinal Lgr5 + stem cells. Figure 1, G shows the PCR identification results of the genotype of Srcap-specific gene knockout mice in intestinal Lgr5 + stem cells. Figure 1, H shows the application of anti-SRCAP protein antibody in Western blotting experiments to prove that SRCAP protein was specifically knocked out in mouse intestinal Lgr5 + stem cells. Figure 1. I shows the tissue-specific changes in the intestine in the mouse colorectal cancer model induced by dextran sulfate sodium (DSS)/chemical mutagen (azoxymethane, AOM). The number of tumors formed in sexual Srcap knockout mice was significantly reduced. Figure 1, J shows the improved survival rate of colorectal cancer induced by Srcap knockout mice. Figure 1, K shows that the number of tumors formed in mice with tissue-specific knockout of Srcap in the intestine was significantly reduced.
图2中A至J所示的结果证明了SRCAP ATPase抑制剂Amtizole对由肠癌干细胞自我更新导致的结直肠癌有抑制效果。具体地,图2,A所示为小分子化合物Amtizole在体外SRCAP ATPase酶活检测体系中显著抑制SRCAP ATPase活性。图2,B所示为在培养体系中抑制肠癌干细胞形成类器官CCO的比例。图2,C所示为Amtizole对Apcmin小鼠自发结直肠癌有明显的抑制作用。图2,D所示为Amtizole缓解小鼠体重的减低。图2,E所示为Amtizole降低小鼠死亡率。图2,F所示为Amtizole处理组小鼠结直肠癌肿瘤数量减少。图2,G所示为Amtizole处理组小鼠结直肠癌肿瘤体积减小。图2,H所示为病理切片染色显示Amtizole处理组小鼠结直肠癌肿瘤数量减少。图2,I所示为临床病人肿瘤样本来源的细胞注入NSG小鼠皮下诱导PDC模型,发现Amtizole在瘤内的使用也能有效抑制肿瘤的生长。图2,J所示为对PDC肿瘤标本进行进一步的免疫组化染色分析,发现Amtizole抑制了增殖相关标志物分子PCNA及信号通路分子PPARδ的表达。The results shown from A to J in Figure 2 demonstrate that the SRCAP ATPase inhibitor Amtizole has an inhibitory effect on colorectal cancer caused by the self-renewal of intestinal cancer stem cells. Specifically, Figure 2, A shows that the small molecule compound Amtizole significantly inhibits SRCAP ATPase activity in the in vitro SRCAP ATPase enzyme activity detection system. Figure 2, B shows the proportion of CCO that inhibits the formation of organoids from intestinal cancer stem cells in the culture system. Figure 2, C shows that Amtizole has a significant inhibitory effect on spontaneous colorectal cancer in Apc min mice. Figure 2, D shows that Amtizole alleviates the weight loss of mice. Figure 2, E shows that Amtizole reduces mouse mortality. Figure 2, F shows the reduction in the number of colorectal cancer tumors in mice treated with Amtizole. Figure 2, G shows the reduction in colorectal cancer tumor volume in mice treated with Amtizole. Figure 2, H shows the staining of pathological sections showing a reduction in the number of colorectal cancer tumors in mice treated with Amtizole. Figure 2, I shows cells derived from clinical patient tumor samples injected subcutaneously into NSG mice to induce a PDC model. It was found that the use of Amtizole in tumors can also effectively inhibit tumor growth. Figure 2, J shows further immunohistochemical staining analysis of PDC tumor specimens. It was found that Amtizole inhibited the expression of the proliferation-related marker molecule PCNA and the signaling pathway molecule PPARδ.
具体实施方式Detailed ways
本发明的发明人在对Lgr5+肠癌干细胞自我更新及结直肠癌肿瘤发生的相关研究中发现:SRCAP在人正常结直肠上皮细胞低表达,而在结直肠癌肿瘤高表达,并随肿瘤演进过程表达不断升高。SRCAP高表达病人结直肠癌预后差。SRCAP敲低HCT116细胞体外成球和体内皮下成瘤能力显著降低。在硫酸葡聚糖钠(Dextran Sulfate,sodium,DSS)/化学诱变剂偶氮甲烷(azoxymethane,AOM)诱导的小鼠结直肠癌模型中,Srcap在肠道的组织特异性敲除小鼠形成肿瘤的数量显著降低,小鼠生存率提高。小分子化合物Amtizole在体外SRCAPATPase酶活检测体系中显著抑制SRCAP ATPase活性。在培养体系中抑制肠癌干细胞形成类器官CCO的比例。Amtizole对Apcmin小鼠自发结直肠癌也有明显的抑制作用。有效缓解小鼠体重的减低,降低小鼠死亡率。肿瘤的数量减少、体积减小。将临床病人肿瘤样本来源的细胞注入NSG小鼠皮下诱导PDC模型,发现Amtizole在瘤内的使用也能有效抑制肿瘤的生长。对PDC肿瘤标本进行进一步的免疫组化染色分析,发现Amtizole抑制了增殖相关标志物分子PCNA及信号通路分子PPARδ的表达。The inventor of the present invention found in the related research on the self-renewal of Lgr5 + intestinal cancer stem cells and the occurrence of colorectal cancer tumors: SRCAP is lowly expressed in normal human colorectal epithelial cells, but highly expressed in colorectal cancer tumors, and it evolves with the tumor. Process expression continues to rise. Colorectal cancer patients with high SRCAP expression have poor prognosis. The ability of SRCAP knockdown HCT116 cells to form spheres in vitro and subcutaneous tumor formation in vivo was significantly reduced. In a mouse colorectal cancer model induced by dextran sulfate sodium (DSS)/chemical mutagen azomethane (AOM), tissue-specific knockout of Srcap in the intestine formed The number of tumors was significantly reduced and the survival rate of the mice was improved. The small molecule compound Amtizole significantly inhibits SRCAP ATPase activity in the in vitro SRCAPATPase enzyme activity detection system. Inhibit the proportion of intestinal cancer stem cells forming organoids CCO in the culture system. Amtizole also has a significant inhibitory effect on spontaneous colorectal cancer in Apc min mice. Effectively alleviate the weight loss of mice and reduce mouse mortality. The number and size of tumors decrease. Cells derived from clinical patient tumor samples were injected subcutaneously into NSG mice to induce a PDC model, and it was found that intratumoral use of Amtizole can also effectively inhibit tumor growth. Further immunohistochemical staining analysis of PDC tumor specimens found that Amtizole inhibited the expression of the proliferation-related marker molecule PCNA and the signaling pathway molecule PPARδ.
本发明的第一个方面提供了SRCAP在促进肠癌演进及肠癌干细胞自我更新中的作用,其特征在于,SRCAP在结直肠癌晚期标本高表达并与预后相关,SRCAP能够促进结直肠癌发生及肠癌干细胞自我更新。The first aspect of the present invention provides the role of SRCAP in promoting the evolution of intestinal cancer and the self-renewal of intestinal cancer stem cells. It is characterized in that SRCAP is highly expressed in late-stage colorectal cancer specimens and is related to prognosis, and SRCAP can promote the occurrence of colorectal cancer. and intestinal cancer stem cell self-renewal.
在本发明的一些实施方案中,在人正常结直肠上皮细胞低表达,而在结直肠癌肿瘤高表达,并随肿瘤演进过程表达不断升高。SRCAP高表达病人结直肠癌预后差。In some embodiments of the present invention, the expression is low in normal human colorectal epithelial cells, but highly expressed in colorectal cancer tumors, and the expression continues to increase with tumor progression. Colorectal cancer patients with high SRCAP expression have poor prognosis.
在本发明的一些实施方案中,SRCAP敲低HCT116细胞体外成球和体内皮下成瘤能力显著降低。In some embodiments of the invention, the ability of SRCAP knockdown HCT116 cells to form spheroids in vitro and subcutaneous tumor formation in vivo is significantly reduced.
在本发明的另一些实施方案中,在硫酸葡聚糖钠(Dextran Sulfate,sodium,DSS)/化学诱变剂偶氮甲烷(azoxymethane,AOM)诱导的小鼠结直肠癌模型中,Srcap在肠道的组织特异性敲除小鼠形成肿瘤的数量显著降低,小鼠生存率提高。In other embodiments of the invention, in a mouse colorectal cancer model induced by dextran sulfate sodium (DSS)/chemical mutagen (azoxymethane, AOM), Srcap The number of tumors formed in mice with tissue-specific knockout of tract was significantly reduced and the survival rate of mice was improved.
本发明的第二个方面提供了一种在肠癌干细胞中抑制SRCAP ATPase的方法,所述方法包括使所述细胞与有效量的SRCAP ATPase的抑制剂Amtizole及其可能的每一种活性修饰产物接触。并提供了一种在需要其的患者中治疗由肠癌干细胞自我更新导致的结直肠癌的方法,所述方法包括向所述患者施用治疗有效量的SRCAP ATPase的抑制剂Amtizole及其可能的每一种活性修饰产物。A second aspect of the invention provides a method for inhibiting SRCAP ATPase in intestinal cancer stem cells, the method comprising contacting the cells with an effective amount of Amtizole, an inhibitor of SRCAP ATPase, and each of its possible active modification products. touch. and provides a method for treating colorectal cancer caused by intestinal cancer stem cell self-renewal in a patient in need thereof, the method comprising administering to the patient a therapeutically effective amount of an inhibitor of SRCAP ATPase, Amtizole, and its possible An active modification product.
在本发明的一些实施方案中,在通过建立SRCAP ATPase体外酶活筛选体系中验证小分子化合物Amtizole在体外抑制SRCAP ATPase并抑制肠癌CCO类器官形成。In some embodiments of the present invention, the small molecule compound Amtizole was verified to inhibit SRCAP ATPase in vitro and inhibit the formation of intestinal cancer CCO organoids by establishing an in vitro enzymatic activity screening system for SRCAP ATPase.
在本发明的一些实施方案中,Amtizole抑制Apcmin小鼠自发结直肠癌。能有效缓解小鼠体重的减低,降低小鼠死亡率。使肿瘤的数量减少、体积减小。In some embodiments of the invention, Amtizole inhibits spontaneous colorectal cancer in Apc min mice. It can effectively alleviate the weight loss of mice and reduce mouse mortality. Reduce the number and size of tumors.
在本发明的另一些实施方案中,Amtizole瘤内注射抑制肠癌PDC模型肿瘤的生长,抑制增殖相关标志物分子PCNA及信号通路分子PPARδ的表达。In other embodiments of the present invention, intratumoral injection of Amtizole inhibits the growth of intestinal cancer PDC model tumors and inhibits the expression of the proliferation-related marker molecule PCNA and the signaling pathway molecule PPARδ.
在第三方面中,在以上第一和第二方面中任一项的方法是,SRCAP ATPase的抑制剂是式(I)的化合物及其可能的每一种活性修饰产物:In a third aspect, the method of any of the above first and second aspects is that the inhibitor of SRCAP ATPase is a compound of formula (I) and each of its possible active modification products:
在第四方面中,本方法涉及抑制SRCAP ATPase酶的每一种的化合物或其药用盐,其用于抑制肠癌干细胞自我更新。In a fourth aspect, the present method relates to compounds that inhibit each of the SRCAP ATPase enzymes or pharmaceutically acceptable salts thereof for inhibiting intestinal cancer stem cell self-renewal.
在第五方面中,本方法涉及抑制SRCAP ATPase酶的每一种的化合物或其药用盐,其用于治疗由肠癌干细胞自我更新所致结直肠癌。In a fifth aspect, the method relates to compounds that inhibit each of the SRCAP ATPase enzymes or pharmaceutically acceptable salts thereof for the treatment of colorectal cancer caused by self-renewal of intestinal cancer stem cells.
在前述方面中的任一项中,SRCAP ATPase酶的每一种的抑制剂可以是相同化合物或不同的化合物。In any of the preceding aspects, the inhibitor of each of the SRCAP ATPase enzymes may be the same compound or a different compound.
在本发明中,术语“SRCAP(NCBI数据库基因ID:10847)”是指具有目前国际共用核酸数据库GeneBank中SRCAP基因所示原始序列的SRCAP,其包括天然的或合成来源的SRCAP及其类似物。SRCAP类似物指其经取代、缺失或添加一个或几个核苷酸,或经过生物学化学修饰后仍具有生物活性的衍生物或变体形式。In the present invention, the term "SRCAP (NCBI database gene ID: 10847)" refers to SRCAP with the original sequence shown in the SRCAP gene in the current international shared nucleic acid database GeneBank, which includes natural or synthetic SRCAP and its analogs. SRCAP analogues refer to derivatives or variants that are still biologically active after substitution, deletion or addition of one or several nucleotides, or biochemical modification.
在本发明中,术语“PCNA(NCBI数据库基因ID:5111)”是指具有目前国际共用核酸数据库GeneBank中PCNA基因所示原始序列的PCNA,其包括天然的或合成来源的PCNA及其类似物。PCNA类似物指其经取代、缺失或添加一个或几个核苷酸,或经过生物学化学修饰后仍具有生物活性的衍生物或变体形式。In the present invention, the term "PCNA (NCBI database gene ID: 5111)" refers to PCNA with the original sequence shown in the PCNA gene in the current international shared nucleic acid database GeneBank, which includes natural or synthetic PCNA and its analogs. PCNA analogues refer to derivatives or variants that are still biologically active after substitution, deletion or addition of one or several nucleotides, or biochemical modification.
在本发明中,术语“PPARD(NCBI数据库基因ID:5467)”是指具有目前国际共用核酸数据库GeneBank中PPARD基因所示原始序列的PPARD,其包括天然的或合成来源的PPARD及其类似物。PPARD类似物指其经取代、缺失或添加一个或几个核苷酸,或经过生物学化学修饰后仍具有生物活性的衍生物或变体形式。In the present invention, the term "PPARD (NCBI database gene ID: 5467)" refers to PPARD with the original sequence shown in the PPARD gene in the current international shared nucleic acid database GeneBank, which includes natural or synthetic PPARD and its analogs. PPARD analogues refer to derivatives or variants that are still biologically active after being substituted, deleted or added with one or several nucleotides, or biochemically modified.
本发明的Amtizole的有效剂量可以随给药的模式和待治疗疾病的严重程度等进行相应的调整。优选的有效量的可以由本领域普通技术人员综合各因素来确定。所述因素包括但不限于:Amtizole或其类似物的药代动力学参数、受治疗患者的健康状况、体重、给药途径等。The effective dose of Amtizole of the present invention can be adjusted accordingly according to the mode of administration and the severity of the disease to be treated. The preferred effective amount can be determined by those of ordinary skill in the art considering various factors. The factors include but are not limited to: pharmacokinetic parameters of Amtizole or its analogues, health status, body weight, route of administration, etc. of the patient being treated.
以下实施例用于说明本发明,但不用来限制本发明的范围。若未特别指明,实施例中所用的技术手段为本领域技术人员所熟知的常规手段。The following examples are used to illustrate the invention but are not intended to limit the scope of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art.
以下为本发明实施例所用材料和一般性方法:The following are the materials and general methods used in the embodiments of the present invention:
抗体和试剂Antibodies and reagents
抗小鼠及人SRCAP抗体(ESL104)购自Kerafast(Boston,USA).抗PPAR-δ(10156-2-AP)抗体购自Proteintech(Chicago,USA).抗小鼠PCNA(ab29)抗体购自Abcam(Cambridge,USA).ATPase/GTPase activity assay kit,EZ prep nuclei isolation kit购自Sigma-Aldrich(St.Louis,USA).Matrigel(356234)w购自Corning(Corning,USA).Anti-mouse and human SRCAP antibodies (ESL104) were purchased from Kerafast (Boston, USA). Anti-PPAR-δ (10156-2-AP) antibodies were purchased from Proteintech (Chicago, USA). Anti-mouse PCNA (ab29) antibodies were purchased from Abcam (Cambridge, USA). ATPase/GTPase activity assay kit, EZ prep nucleic acid isolation kit were purchased from Sigma-Aldrich (St. Louis, USA). Matrigel (356234) w was purchased from Corning (Corning, USA).
统计分析Statistical Analysis
在本发明中使用未配对的学生t检验作为统计分析。使用Microsoft Excel或SPSS13进行统计学计算。当P<0.05时,P值显著。Unpaired Student's t-test was used as statistical analysis in this invention. Statistical calculations were performed using Microsoft Excel or SPSS13. When P<0.05, the P value is significant.
实施例Example
实施例1:证明SRCAP能够促进结直肠癌发生及肠癌干细胞自我更新。Example 1: Prove that SRCAP can promote colorectal carcinogenesis and intestinal cancer stem cell self-renewal.
在人结直肠癌组织芯片(购自上海芯超生物科技有限公司,结肠癌180点生存期组织芯片,产品编号HColA180Su15)上观察到SRCAP在人正常结直肠上皮细胞低表达,而在结直肠癌肿瘤高表达,并随肿瘤演进过程表达不断升高,如图1,A所示。SRCAP在结直肠癌不同分期分级中的表达统计,如图1,B所示。SRCAP表达与生存期分析显示SRCAP高表达病人结直肠癌预后差,如图1,C所示。在SRCAP敲低的人结肠癌细胞系HCT116(HCT116细胞购自中国科学院上海细胞库,目录号TCHu 99。SRCAP敲低细胞系由实验室自行筛选,shSRCAP:5’-GCTTTCCATGGAGGAGCTATT-3’)上,肿瘤干细胞体外成球能力受到抑制,如图1,D所示。SRCAP敲低HCT116细胞体内皮下成瘤能力显著降低,如图1,E所示。通过CRISPR-Cas9方法构建Srcap条件基因敲除小鼠,与肠道干细胞特异表达的Lgr5-Cre小鼠(B6.129P2-Lgr5tm1(cre /ERT2)Cle/J,购自美国Jackson实验室,Stock No.008875)交配得到在小鼠肠道干细胞中特异性敲除Srcap基因的基因敲除小鼠(Srcapfl/fl;Lgr5-Cre)及对照鼠(Srcapfl/fl),如图1,F所示。Srcap在肠道Lgr5+干细胞中特异性基因敲除小鼠基因型PCR鉴定结果如图1,G所示。SRCAP蛋白在小鼠肠道Lgr5+干细胞中实现了特异性敲除,如图1,H所示。在硫酸葡聚糖钠(Dextran Sulfate,sodium,DSS)/化学诱变剂偶氮甲烷(azoxymethane,AOM)诱导的小鼠结直肠癌模型(模型构建方法见参考文献[1])中,在肠道的组织特异性Srcap敲除小鼠(具体敲除方法以及实验验证结果见图1F-1H)形成肿瘤的数量显著降低,如图1,I所示。Srcap敲除鼠诱导结直肠癌生存率提高,如图1,J所示。Srcap在肠道的组织特异性敲除小鼠形成肿瘤的数量显著降低。如图1,K所示。Low expression of SRCAP in human normal colorectal epithelial cells was observed on the human colorectal cancer tissue chip (purchased from Shanghai Xinchao Biotechnology Co., Ltd., colon cancer 180-point survival tissue chip, product number HColA180Su15), while in colorectal cancer It is highly expressed in tumors and continues to increase as the tumor evolves, as shown in Figure 1, A. The expression statistics of SRCAP in different stages and grades of colorectal cancer are shown in Figure 1, B. Analysis of SRCAP expression and survival showed that patients with colorectal cancer with high SRCAP expression had a poor prognosis, as shown in Figure 1, C. On the SRCAP knockdown human colon cancer cell line HCT116 (HCT116 cells were purchased from the Shanghai Cell Bank of the Chinese Academy of Sciences, catalog number TCHu 99. The SRCAP knockdown cell line was screened by the laboratory itself, shSRCAP:5'-GCTTTCCATGGAGGAGCTATT-3'), The ability of tumor stem cells to form spheres in vitro was inhibited, as shown in Figure 1, D. The subcutaneous tumor-forming ability of SRCAP knockdown HCT116 cells in vivo was significantly reduced, as shown in Figure 1, E. Srcap conditional knockout mice were constructed through the CRISPR-Cas9 method, and Lgr5-Cre mice (B6.129P2-Lgr5 tm1(cre /ERT2)Cle /J, which specifically expresses intestinal stem cells) were purchased from Jackson Laboratory, USA, Stock No.008875) to obtain knockout mice (Srcap fl/fl ; Lgr5-Cre) and control mice (Srcap fl/fl ) that specifically knock out the Srcap gene in mouse intestinal stem cells, as shown in Figure 1, F shown. The results of genotype PCR identification of Srcap-specific gene knockout mice in intestinal Lgr5 + stem cells are shown in Figure 1, G. SRCAP protein was specifically knocked out in mouse intestinal Lgr5 + stem cells, as shown in Figure 1, H. In the mouse colorectal cancer model induced by dextran sulfate sodium (Dextran Sulfate, sodium, DSS)/chemical mutagen (azoxymethane, AOM) (see reference [1] for model construction methods), in the intestine The number of tumors formed in the tissue-specific Srcap knockout mice of the tract (see Figures 1F-1H for specific knockout methods and experimental verification results) was significantly reduced, as shown in Figure 1, I. The survival rate of colorectal cancer induced by Srcap knockout mice is improved, as shown in Figure 1, J. The number of tumors formed in mice with tissue-specific knockout of Srcap in the intestine was significantly reduced. As shown in Figure 1, K.
实施例2:证明SRCAP ATPase抑制剂Amtizole对由肠癌干细胞自我更新导致的结直肠癌有抑制效果。Example 2: Prove that the SRCAP ATPase inhibitor Amtizole has an inhibitory effect on colorectal cancer caused by the self-renewal of intestinal cancer stem cells.
小分子化合物Amtizole在体外SRCAP ATPase酶活检测体系(参考文献[2])中显著抑制SRCAP ATPase活性,如图2,A所示(在OD620下比色读值,以IgG作为阴性对照,阳性读值与IgG的差值作为相对酶活值,DMSO=0.38±0.04,Amitizole=0.09±0.02)。在培养体系中抑制肠癌干细胞形成类器官CCO(colorectal cancer organoid,人结直肠癌类器官)的比例,如图2,B所示。Amtizole(1.5mg/kg体重)对Apcmin小鼠自发结直肠癌(动物模型/方法的参考文献参见[1])有明显的抑制作用,如图2,C所示。Amtizole(1.5mg/kg体重)缓解小鼠体重的减低,如图2,D所示。Amtizole(1.5mg/kg体重)降低小鼠死亡率,如图2,E所示。Amtizole处理组(1.5mg/kg体重)小鼠结直肠癌肿瘤数量减少,如图2,F所示。Amtizole处理组(1.5mg/kg体重)小鼠结直肠癌肿瘤体积减小,如图2,G所示。病理切片染色显示Amtizole处理组小鼠结直肠癌肿瘤数量减少,如图2,H所示。临床病人肿瘤样本来源的细胞(升结肠癌手术样本来源于解放军301医院)注入NSG(NOD-Prkdcscid Il2rgtm1/Bcgen,购自百奥赛图公司)小鼠皮下诱导PDC(patient-derived cells)模型(动物模型/方法的参考文献参见[1]),发现Amtizole在瘤内的使用(10μg瘤内注射,每3天一次)也能有效抑制肿瘤的生长,如图2,I所示。对PDC肿瘤标本进行进一步的免疫组化染色分析,发现与对照DMSO相比,Amtizole抑制了增殖相关标志物分子PCNA(Proliferating Cell Nuclear Antigen,增殖细胞核抗原)及信号通路分子PPARδ的表达,如图2,J所示。The small molecule compound Amtizole significantly inhibited SRCAP ATPase activity in the in vitro SRCAP ATPase enzyme activity detection system (reference [2]), as shown in Figure 2, A (colorimetric reading at OD 620 , using IgG as a negative control, positive The difference between the reading value and IgG is used as the relative enzyme activity value, DMSO=0.38±0.04, Amitizole=0.09±0.02). The ratio of inhibiting the formation of CCO (colorectal cancer organoid, human colorectal cancer organoid) organoids from intestinal cancer stem cells in the culture system is shown in Figure 2, B. Amtizole (1.5 mg/kg body weight) has a significant inhibitory effect on spontaneous colorectal cancer in Apc min mice (see [1] for references on animal models/methods), as shown in Figure 2, C. Amtizole (1.5 mg/kg body weight) alleviated the weight loss of mice, as shown in Figure 2, D. Amtizole (1.5 mg/kg body weight) reduced mouse mortality, as shown in Figure 2, E. The number of colorectal cancer tumors in mice in the Amtizole-treated group (1.5 mg/kg body weight) was reduced, as shown in Figure 2, F. The colorectal cancer tumor volume of mice in the Amtizole-treated group (1.5 mg/kg body weight) decreased, as shown in Figure 2, G. Pathological section staining showed that the number of colorectal cancer tumors in the Amtizole-treated mice was reduced, as shown in Figure 2, H. Cells derived from clinical patient tumor samples (ascending colon cancer surgical samples were obtained from the 301 Hospital of the People's Liberation Army) were injected into NSG (NOD-Prkdcscid Il2rgtm1/Bcgen, purchased from Biocytogen) to subcutaneously induce PDC (patient-derived cells) models in mice (animals For references of models/methods, see [1]). It was found that intratumoral use of Amtizole (10 μg intratumoral injection, once every 3 days) can also effectively inhibit tumor growth, as shown in Figure 2, I. Further immunohistochemical staining analysis of PDC tumor specimens showed that compared with control DMSO, Amtizole inhibited the expression of the proliferation-related marker molecule PCNA (Proliferating Cell Nuclear Antigen, Proliferating Cell Nuclear Antigen) and the signaling pathway molecule PPARδ, as shown in Figure 2 , shown in J.
本领域技术人员应该理解,尽管参照上述实施例对本发明进行了具体的描述,但是本发明并不限于这些具体的实施例。基于本发明所教导的方法和技术方案,在不背离本发明的精神的前提下,本领域技术人员能够进行适当的修改或改进,由此所得的等价实施方案都在本发明的范围内。参考文献Those skilled in the art should understand that although the present invention has been specifically described with reference to the above embodiments, the present invention is not limited to these specific embodiments. Based on the methods and technical solutions taught in the present invention, those skilled in the art can make appropriate modifications or improvements without departing from the spirit of the present invention, and equivalent embodiments obtained thereby are within the scope of the present invention. references
1.Zhu,P.et al.LncGata6maintains stemness of intestinal stem cells andpromotes intestinal tumorigenesis.Nat Cell Biol 20,1134-1144(2018).1. Zhu, P. et al. LncGata6maintains stemness of intestinal stem cells and promotes intestinal tumorigenesis. Nat Cell Biol 20, 1134-1144 (2018).
2.Ye,B.et al.Suppression of SRCAP chromatin remodelling complex andrestriction of lymphoid lineage commitment by Pcid2.Nat Commun 8,017-01788(2017).2. Ye, B. et al. Suppression of SRCAP chromatin remodelling complex and restriction of lymphoid lineage commitment by Pcid2. Nat Commun 8, 017-01788 (2017).
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