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陆军军医大学(第三军医大学)第二附属医院消化内科,重庆
罗强,E-mail:luoqiang0816@126.com
收稿日期:2025-02-14,
修回日期:2025-04-15,
录用日期:2025-04-16,
纸质出版日期:2025-06-15
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郑传浩,但瑞珏,奚茜,等.缺氧诱导因子-1α纳米抑制剂的构建及在逆转结直肠癌细胞化疗耐药中的应用[J].陆军军医大学学报,2025,47(11):1177-1189.DOI:10.16016/j.2097-0927.202502006.
ZHENG C H,DAN R J,XI X,et al.Preparation of nanosized hypoxia-inducible factor 1α inhibitor and its application in reversing chemoresistance in colorectal cancer cells[J].J Army Med Univ,2025,47(11):1177-1189.DOI:10.16016/j.2097-0927.202502006.
郑传浩,但瑞珏,奚茜,等.缺氧诱导因子-1α纳米抑制剂的构建及在逆转结直肠癌细胞化疗耐药中的应用[J].陆军军医大学学报,2025,47(11):1177-1189.DOI:10.16016/j.2097-0927.202502006. DOI:
ZHENG C H,DAN R J,XI X,et al.Preparation of nanosized hypoxia-inducible factor 1α inhibitor and its application in reversing chemoresistance in colorectal cancer cells[J].J Army Med Univ,2025,47(11):1177-1189.DOI:10.16016/j.2097-0927.202502006. DOI:
目的
2
对缺氧诱导因子-1α(hypoxia-inducible factor 1α, HIF-1α)抑制剂YC-1进行纳米化改性,探究其在逆转结直肠癌化疗耐药中的作用。
方法
2
利用YC-1分子中的活性官能团羟基(-OH)与甲氧基聚乙二醇-羧酸的羧基(methoxy-polyethylene glycol carboxylic acid, mPEG
350
-COOH)缩合反应构建纳米抑制剂mPEG
350
-YC-1 (MYC-1),并通过核磁共振氢谱(
1
H nuclear magnetic resonance,
1
H-NMR)进行验证;利用透射电子显微镜(transmission electron microscope, TEM)分析其形貌,利用动态光散射(dynamic light scattering, DLS)分析其粒径分布情况;通过将FITC标记的MYC-1 (FYC-1)与HCT15细胞相互作用,利用激光共聚焦显微镜观察细胞对FYC-1的摄取能力;CCK-8实验检测MYC-1的细胞毒性;通过耐药HCT15细胞(resistant-HCT15, R-HCT15)的毒性实验和活/死细胞染色检测MYC-1对化疗药物5-氟尿嘧啶(5-fluorouracil,5-Fu)的增敏效果;采用免疫荧光染色和Western blot实验来检测MYC-1逆转耐药的机制。构建小鼠R-HCT15皮下移植瘤模型,采用简单随机分组法将小鼠分为PBS(
n
=3)、5-Fu(
n
=3)、MYC-1(
n
=3)和MYF(
n
=3)组。通过绘制肿瘤体积增长曲线,测量完成疗效评估当日的小鼠肿瘤质量,对比各组小鼠肿瘤生长情况,从而评价MYC-1逆转结直肠癌对5-Fu耐药的能力。
结果
2
成功制备了纳米抑制剂MYC-1,通过TEM和DLS验证MYC-1在水相溶液中能自组装成直径约为(19.96±2.97) nm的纳米颗粒。成功制备FYC-1,将FYC-1与HCT15细胞相互作用,FYC-1能更好地被细胞摄取,表明两亲性的MYC-1具有更强的内吞入胞能力;MYC-1与5-Fu联合作用于R-HCT15结肠癌细胞,其耐药指数(resistant index, RI)由7.99下降到1.55,耐药指数的相对逆转率(relative reversal rate, RRR)为80.60%;活/死细胞染色显示,MYC-1能增加5-Fu对R-HCT15细胞的毒性;免疫荧光染色和Western blot实验表明MYC-1能够有效抑制HIF-1α在胞内的表达(
P
<
0.01);MYC-1与5-Fu联合作用于R-HCT15皮下移植瘤小鼠,与PBS(
P
<
0.001)、5-Fu(
P
<
0.01)和MYC-1(
P
<
0.01)比较,MYF组治疗效果最佳;肿瘤组织HIF-1α免疫荧光染色显示,MYC-1和MYF组HIF-1α表达下降;小鼠重要脏器HE染色显示,各治疗组重要脏器未见明显损害。
结论
2
MYC-1纳米抑制剂能够通过降低结直肠癌细胞HIF-1α蛋白的表达,从而逆转结直肠癌对于5-Fu化疗的耐药性,有效改善5-Fu的治疗效果。
Objective To modify YC-1
an inhibitor of hypoxia-inducible factor-1α (HIF-1α) into nanoparticles and explore its effect on reversing chemoresistance of colorectal cancer cells. Methods Nano-inhibitor mPEG
350
-YC-1 (MYC-1) was prepared by the carboxyl condensation reaction of the active functional group hydroxyl (-OH) in the YC-1 molecule with methoxy polyethylene glycol carboxylic acid
and was verified by
1
H nuclear magnetic resonance (
1
H-NMR). Its morphology was analyzed by transmission electron microscope (TEM)
and its particle size distribution was analyzed by dynamic light scattering (DLS). By interacting FITC-labeled MYC-1 (FYC-1) with HCT15 cells
the uptake ability of FYC-1 by the cells was observed using laser confocal microscopy. The cytotoxicity of MYC-1 was measured with CCK-8 assay. The sensitization effect of MYC-1 on the chemotherapy drug 5-Fu was detected through toxicity tests of resistant HCT15 cells (resistant HCT15
R-HCT15) and live/dead cell staining. The mechanism of MYC-1 reversing drug resistance was determined with immunofluorescence staining of HIF-1α and western blotting. Finally
a subcutaneous transplanted tumor model of R-HCT15 cells was constructed. The tumor bearing mice were randomly divided into PBS
5-Fu
MYC-1
and MYF groups
with 3 mice in each group. The tumor volume and weight were observed after treatment in each group to evaluate the ability of MYC-1 to reverse 5-Fu resistance in colorectal cancer. Results The nano-inhibitor MYC-1 was successfully prepared. TEM and DLS showed that MYC-1 could self-assemble into nanoparticles with a diameter of approximately 19.96±2.97 nm in aqueous solution. FYC-1 was also successfully prepared. When FYC-1 was interacted with HCT15 cells
FYC-1 could be better taken up by the cells
indicating that the amphiphilic MYC-1 could
be better endocytosed into the cells to exert its function. When MYC-1 and 5-Fu acted in combination in colon cancer R-HCT15 cells
the resistance index (RI) was decreased from 7.99 to 1.55
and the relative reversal rate (RRR) of RI was 80.6%. Live (green)/dead (red) cell staining revealed that MYC-1 increased the toxicity of 5-Fu to R-HCT15 cells. Immunofluorescence staining (
P
<
0.01) and Western blotting indicated that MYC-1 effectively inhibited the intracellular expression of HIF-1α. The combined action of MYC-1 and 5-Fu on mice with R-HCT15 subcutaneous transplanted tumors had the best therapeutic effect when compared with PBS (
P
<
0.001)
5-Fu (
P
<
0.01)
and MYC-1 (
P
<
0.01). Immunofluorescence staining of HIF-1α in tumor tissues displayed that the expression of HIF-1α was decreased in the MYC-1 and MYF groups. HE staining showed that there was no obvious damage to the important organs in each treatment group. Conclusion Nano-inhibitor MYC-1 can reverse the drug resistance of colorectal cancer to 5-Fu chemotherapy by reducing the expression of HIF-1α protein in colorectal cancer cells
thereby effectively improving the therapeutic effect of 5-Fu.
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