Article(id=1222467101823062128, tenantId=1146029695717560320, journalId=1189982191388893191, issueId=1222467099071603148, articleNumber=null, orderNo=null, doi=10.16438/j.0513-4870.2018-1142, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1545580800000, receivedDateStr=2018-12-24, revisedDate=1548172800000, revisedDateStr=2019-01-23, acceptedDate=null, acceptedDateStr=null, onlineDate=1769388469415, onlineDateStr=2026-01-26, pubDate=1562860800000, pubDateStr=2019-07-12, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1769388469415, onlineIssueDateStr=2026-01-26, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1769388469415, creator=13701087609, updateTime=1769388469415, updator=13701087609, issue=Issue{id=1222467099071603148, tenantId=1146029695717560320, journalId=1189982191388893191, year='2019', volume='54', issue='7', pageStart='1145', pageEnd='1332', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1769388468759, creator=13701087609, updateTime=1769389451859, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1222471222554775860, tenantId=1146029695717560320, journalId=1189982191388893191, issueId=1222467099071603148, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1222471222554775861, tenantId=1146029695717560320, journalId=1189982191388893191, issueId=1222467099071603148, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=1200, endPage=1206, ext={EN=ArticleExt(id=1222467102376710271, articleId=1222467101823062128, tenantId=1146029695717560320, journalId=1189982191388893191, language=EN, title=Down-regulation of miR-205-5p sensitizes HNE1/DDP to cisplatin induced apoptosis in vitro, columnId=1190335348761793317, journalTitle=Acta Pharmaceutica Sinica, columnName=Original Articles, runingTitle=null, highlight=null, articleAbstract=

This study aims to investigate the effect of down-regulation of miR-205-5p by transfection of miR-205-5p inhibitor on the sensitivity of HNE1/DDP cells to cisplatin (DDP) induced apoptosis and explore the underlying mechanism. qRT-PCR was used to detect the expression of miR-205-5p in HNE1 or HNE1/DDP cells. The expression level of miR-205-5p was analyzed after transfecting HNE1/DDP cells with miR-205-5p inhibitor. MTT assay was used to evaluate the inhibitory effect of DDP alone or in combination with miR-205-5p inhibitor on the proliferation of HNE1/DDP or HNE1 cells. Apoptosis of cells treated with miR-205-5p inhibitor alone or in combination with DDP (8 μmol·L-1) was assessed using flow cytometry with PI staining, with the nucleus was counterstained with DAPI staining. The expression of Bax, Bak, Mcl-1, or Bcl-2 was analyzed by Western blot. HNE1/DDP cells showed a high level of expression of miR-205-5p, and the expression of miR-205-5p was significantly decreased by transfection of miR-205-5p inhibitor. Down-regulation of miR-205-5p significantly increased the sensitivity of HNE1/DDP cells to DDP (P < 0.05). Transfection of miR-205-5p inhibitor enhanced the sensitivity of HNE1/DDP cells to DDP induced apoptosis. Treatment of HNE1/DDP cells with miR-205-5p inhibitor combined with DDP (8 μmol·L-1) for 24 h resulted in an apoptotic rate of 28.93% ±2.50%, significantly higher than that treated with miR-205-5p inhibitor (9.83% ±1.31%) or DDP alone (10.83% ±1.70%) (P < 0.05). DAPI staining showed that HNE1/DDP cell nucleus became significantly condensed and fragmented in miR-205-5p inhibitor combined with DDP group. The combined group up-regulated the expression of Bax and down-regulated the expression of Bcl-2 in HNE1/DDP cells. Therefore, down-regulation of miR-205-5p can enhance the sensitivity of HNE1/DDP cells to cisplatin induced apoptosis, and the mechanism may involve up-regulation of Bax and down-regulation of Bcl-2 expression.

, correspAuthors=Pei ZHANG, authorNote=null, correspAuthorsNote=null, copyrightStatement=Copyright ©2019 Acta Pharmaceutica Sinica. All rights reserved., copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, authorCompany=null, fund=null, authors=null, authorsList=Wei-man ZHAO, Zhi-yong DONG, Zong-fen SHI, Xing-yue LU, Hao LIU, Pei ZHANG), CN=ArticleExt(id=1222467103496589507, articleId=1222467101823062128, tenantId=1146029695717560320, journalId=1189982191388893191, language=CN, title=下调miR-205-5p增强鼻咽癌细胞HNE1/DDP对顺铂诱导凋亡的敏感性, columnId=1190335348896011050, journalTitle=药学学报, columnName=研究论文, runingTitle=null, highlight=null, articleAbstract=

探讨下调miR-205-5p增强鼻咽癌耐药细胞HNE1/DDP对顺铂诱导凋亡的敏感性及其可能机制。qRT-PCR检测HNE1、HNE1/DDP细胞中miR-205-5p的表达差异及HNE1/DDP细胞转染miR-205-5p抑制剂后miR-205-5p的变化;MTT法检测顺铂(DDP)和miR-205-5p抑制剂对HNE1/DDP或HNE1细胞的增殖抑制作用;PI单染流式技术检测细胞凋亡情况;DAPI染色观察细胞核的形态;Western blot检测Bax、Bak、Mcl-1、Bcl-2蛋白的表达水平。结果显示,相比于HNE1细胞,HNE1/DDP高表达miR-205-5p,转染miR-205-5p抑制剂后其表达明显下降。下调miR-205-5p可显著提高HNE1/DDP细胞对顺铂的敏感性(P < 0.05)。PI单染结果显示,转染miR-205-5p抑制剂可增强HNE1/DDP细胞对顺铂的诱导凋亡作用。miR-205-5p抑制剂联合DDP(8 μmol·L-1)作用HNE1/DDP细胞24 h的凋亡率为(28.93 ±2.50)%,相比单用miR-205-5p抑制剂(9.83 ±1.31)%或DDP的凋亡率(10.83 ±1.70)%显著升高(P < 0.05)。联合作用组细胞表现为细胞核明显皱缩浓集呈碎片状。miR-205-5p抑制剂与DDP合用能上调Bax的表达和下调Bcl-2的表达。提示下调miR-205-5p可增强HNE1/DDP细胞对DDP的敏感性,其作用机制可能是促凋亡蛋白Bax的升高和抗凋亡蛋白Bcl-2的下降。

, correspAuthors=张配, authorNote=null, correspAuthorsNote=
*张配, Tel:86-552-3175452, E-mail:
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A: HNE1 and HNE1/DDP cells; B: HNE1/DDP cells transfected with miR-205-5p inhibitor. <i>n</i> = 3, $\bar{x}\pm s$. <sup>&</sup><i>P</i> < 0.05 <i>vs</i> HNE1 cells; <sup>*</sup><i>P</i> < 0.05 <i>vs</i> inhibitor NC. DDP: Cisplatin; NC: Negative control , figureFileSmall=3GVqij9AjraduTGtyzyAPg==, figureFileBig=fkX0DdU5MJtLuYhN4hDTWw==, tableContent=null), ArticleFig(id=1222513644366189068, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222467101823062128, language=EN, label=null, caption=null, figureFileSmall=ZFkdhxUhZk0UCtgm6UkYaQ==, figureFileBig=/7AJESrgg9QJWbllszJwtw==, tableContent=null), ArticleFig(id=1222513644466852378, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222467101823062128, language=CN, label=Figure 2, caption= Effects of DDP on cells viability. A: HNE1/DDP and HNE1 cells; B: HNE1/DDP cells before or after transfection with miR-205-5p inhibitor. <i>n</i> = 3, $\bar{x}\pm s$. <sup>&</sup><i>P</i> < 0.05 <i>vs</i> HNE1 cells; <sup>#</sup><i>P</i> < 0.05 <i>vs</i> DDP alone , figureFileSmall=ZFkdhxUhZk0UCtgm6UkYaQ==, figureFileBig=/7AJESrgg9QJWbllszJwtw==, tableContent=null), ArticleFig(id=1222513644571709993, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222467101823062128, language=EN, label=null, caption=null, figureFileSmall=KZqrCU61u00nwT5CQiZ4gw==, figureFileBig=qYzba8LE3bpkbg4dk8pWrg==, tableContent=null), ArticleFig(id=1222513644684956220, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222467101823062128, language=CN, label=Figure 3, caption= The effect of down-regulation of miR-205-5p on DDP-induced cell apoptosis. A: Effect of DDP on apoptosis of HNE1 and HNE1/DDP cells; B: Effects of miR-205-5p inhibitor, DDP, either alone or in combination, on apoptosis of HNE1/DDP cells. <i>n</i> = 3, $\bar{x}\pm s$. <sup>&</sup><i>P</i> < 0.05 compared to DDP in HNE1 cells; <sup>*</sup><i>P</i> < 0.05 <i>vs</i> control; <sup>#</sup><i>P</i> < 0.05 <i>vs</i> DDP or miR-205-5p inhibitor treatment alone , figureFileSmall=KZqrCU61u00nwT5CQiZ4gw==, figureFileBig=qYzba8LE3bpkbg4dk8pWrg==, tableContent=null), ArticleFig(id=1222513644789813833, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222467101823062128, language=EN, label=null, caption=null, figureFileSmall=Z3Z95LdcEtV6s7EFtS781w==, figureFileBig=k5fDRiSJ/z9bzlGfMn8Vlw==, tableContent=null), ArticleFig(id=1222513644894671447, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222467101823062128, language=CN, label=Figure 4, caption= Effects of miR-205-5p inhibitor and DDP (8 μmol·L<sup>-1</sup> for 24 h), either 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下调miR-205-5p增强鼻咽癌细胞HNE1/DDP对顺铂诱导凋亡的敏感性
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赵伟曼 , 董智勇 , 时宗芬 , 鲁星月 , 刘浩 , 张配 *
药学学报 | 研究论文 2019,54(7): 1200-1206
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药学学报 | 研究论文 2019, 54(7): 1200-1206
下调miR-205-5p增强鼻咽癌细胞HNE1/DDP对顺铂诱导凋亡的敏感性
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赵伟曼, 董智勇, 时宗芬, 鲁星月, 刘浩, 张配*
作者信息
  • 蚌埠医学院药学院, 安徽 蚌埠 233030

通讯作者:

*张配, Tel:86-552-3175452, E-mail:
Down-regulation of miR-205-5p sensitizes HNE1/DDP to cisplatin induced apoptosis in vitro
Wei-man ZHAO, Zhi-yong DONG, Zong-fen SHI, Xing-yue LU, Hao LIU, Pei ZHANG*
Affiliations
  • School of Pharmacy, Bengbu Medical College, Bengbu 233030, China
出版时间: 2019-07-12 doi: 10.16438/j.0513-4870.2018-1142
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探讨下调miR-205-5p增强鼻咽癌耐药细胞HNE1/DDP对顺铂诱导凋亡的敏感性及其可能机制。qRT-PCR检测HNE1、HNE1/DDP细胞中miR-205-5p的表达差异及HNE1/DDP细胞转染miR-205-5p抑制剂后miR-205-5p的变化;MTT法检测顺铂(DDP)和miR-205-5p抑制剂对HNE1/DDP或HNE1细胞的增殖抑制作用;PI单染流式技术检测细胞凋亡情况;DAPI染色观察细胞核的形态;Western blot检测Bax、Bak、Mcl-1、Bcl-2蛋白的表达水平。结果显示,相比于HNE1细胞,HNE1/DDP高表达miR-205-5p,转染miR-205-5p抑制剂后其表达明显下降。下调miR-205-5p可显著提高HNE1/DDP细胞对顺铂的敏感性(P < 0.05)。PI单染结果显示,转染miR-205-5p抑制剂可增强HNE1/DDP细胞对顺铂的诱导凋亡作用。miR-205-5p抑制剂联合DDP(8 μmol·L-1)作用HNE1/DDP细胞24 h的凋亡率为(28.93 ±2.50)%,相比单用miR-205-5p抑制剂(9.83 ±1.31)%或DDP的凋亡率(10.83 ±1.70)%显著升高(P < 0.05)。联合作用组细胞表现为细胞核明显皱缩浓集呈碎片状。miR-205-5p抑制剂与DDP合用能上调Bax的表达和下调Bcl-2的表达。提示下调miR-205-5p可增强HNE1/DDP细胞对DDP的敏感性,其作用机制可能是促凋亡蛋白Bax的升高和抗凋亡蛋白Bcl-2的下降。

鼻咽癌细胞  /  顺铂  /  miR-205-5p  /  耐药性  /  凋亡

This study aims to investigate the effect of down-regulation of miR-205-5p by transfection of miR-205-5p inhibitor on the sensitivity of HNE1/DDP cells to cisplatin (DDP) induced apoptosis and explore the underlying mechanism. qRT-PCR was used to detect the expression of miR-205-5p in HNE1 or HNE1/DDP cells. The expression level of miR-205-5p was analyzed after transfecting HNE1/DDP cells with miR-205-5p inhibitor. MTT assay was used to evaluate the inhibitory effect of DDP alone or in combination with miR-205-5p inhibitor on the proliferation of HNE1/DDP or HNE1 cells. Apoptosis of cells treated with miR-205-5p inhibitor alone or in combination with DDP (8 μmol·L-1) was assessed using flow cytometry with PI staining, with the nucleus was counterstained with DAPI staining. The expression of Bax, Bak, Mcl-1, or Bcl-2 was analyzed by Western blot. HNE1/DDP cells showed a high level of expression of miR-205-5p, and the expression of miR-205-5p was significantly decreased by transfection of miR-205-5p inhibitor. Down-regulation of miR-205-5p significantly increased the sensitivity of HNE1/DDP cells to DDP (P < 0.05). Transfection of miR-205-5p inhibitor enhanced the sensitivity of HNE1/DDP cells to DDP induced apoptosis. Treatment of HNE1/DDP cells with miR-205-5p inhibitor combined with DDP (8 μmol·L-1) for 24 h resulted in an apoptotic rate of 28.93% ±2.50%, significantly higher than that treated with miR-205-5p inhibitor (9.83% ±1.31%) or DDP alone (10.83% ±1.70%) (P < 0.05). DAPI staining showed that HNE1/DDP cell nucleus became significantly condensed and fragmented in miR-205-5p inhibitor combined with DDP group. The combined group up-regulated the expression of Bax and down-regulated the expression of Bcl-2 in HNE1/DDP cells. Therefore, down-regulation of miR-205-5p can enhance the sensitivity of HNE1/DDP cells to cisplatin induced apoptosis, and the mechanism may involve up-regulation of Bax and down-regulation of Bcl-2 expression.

nasopharyngeal carcinoma cell  /  cisplatin  /  miR-205-5p  /  drug resistance  /  apoptosis
赵伟曼, 董智勇, 时宗芬, 鲁星月, 刘浩, 张配. 下调miR-205-5p增强鼻咽癌细胞HNE1/DDP对顺铂诱导凋亡的敏感性. 药学学报, 2019 , 54 (7) : 1200 -1206 . DOI: 10.16438/j.0513-4870.2018-1142
Wei-man ZHAO, Zhi-yong DONG, Zong-fen SHI, Xing-yue LU, Hao LIU, Pei ZHANG. Down-regulation of miR-205-5p sensitizes HNE1/DDP to cisplatin induced apoptosis in vitro[J]. Acta Pharmaceutica Sinica, 2019 , 54 (7) : 1200 -1206 . DOI: 10.16438/j.0513-4870.2018-1142
鼻咽癌(NPC)是耳鼻喉科常见的头颈部恶性肿瘤, 多发病于中国南方、东南亚和北非等地区。生活环境、家族遗传和一些病毒的慢性感染等多种因素共同作用导致鼻咽癌的发病原因较为复杂[1, 2]。目前临床上鼻咽癌的首选治疗方法是放疗。然而, 由于易发生局部或远处转移, 放疗的优势仅限于原位癌的早期阶段。目前放疗和顺铂辅助化疗已成为鼻咽癌的标准治疗方法[3]。但化疗中顺铂会诱导耐药, 容易引起肿瘤的复发和转移, 所以鼻咽癌患者的总体预后仍然较差。因此, 了解鼻咽癌转移及耐药的分子机制, 有助于寻找新的治疗药物, 提高临床治疗效果, 改善患者的预后。
微小RNA (microRNAs, miRNAs)是一类存在于生物体内的高度保守的非编码内源性小RNA分子, 长度通常在18~25 bp之间, 通过与目标mRNA的3'非编码区域结合, 调节其转录后表达水平。近年来, miRNA在肿瘤发生发展和耐药中的作用得到了深入的研究[4, 5], miRNA表达水平的改变可通过调节目的基因的转录, 影响靶蛋白表达水平, 并最终影响肿瘤细胞对药物的敏感性。分析耐药肿瘤细胞中miRNA表达的差异, 对阐明耐药机制及逆转化疗耐药具有重要意义[6, 7]。课题组前期利用miRNA芯片(miRNA microarray)研究顺铂耐药(HNE1/DDP)和顺铂敏感(HNE1)的鼻咽癌细胞中miRNA差异性, 发现miR-205-5p在耐顺铂的鼻咽癌细胞中显著高表达。目前虽已有关于miRNA在鼻咽癌中的作用研究报道[8], 但未有miR-205-5p与顺铂耐药性的相关研究。
因此, 本研究拟采用miRNA转染技术通过转染miR-205-5p抑制剂下调鼻咽癌细胞HNE1/DDP中miR-205-5p的表达, 探究其对顺铂诱导凋亡敏感性的作用及可能的机制, 为提高鼻咽癌的治愈率寻求新的思路。
主要试剂  二甲基亚砜(DMSO)、碘化丙啶(PI), Sigma公司; RPMI 1640培养基、胰蛋白酶, 美国Gibco公司; 顺铂(DDP), 齐鲁制药有限公司; 胎牛血清(FBS), 杭州四季青公司; Trizol试剂、LipofectamineTM 2000, Invitrogen公司; 兔抗人Bax、Bak、Mcl-1、Bcl-2抗体和鼠抗人β-actin抗体, Santa Cruz公司; miR-205-5p抑制剂, 上海吉玛制药技术有限公司。
细胞株和细胞培养 人鼻咽癌细胞HNE1、HNE1/DDP细胞株购自中南大学湘雅医学院, 由蚌埠医学院药理实验室保存, 培养于RPMI 1640培养基中(含10%胎牛血清、青霉素100 u·mL-1、链霉素100 u·mL-1), HNE1/DDP细胞培养基需另外含4 µmol·L-1 DDP, 所有细胞置37 ℃、5% CO2的细胞培养箱中[9]
miRNA转染 将生长良好的HNE1/DDP细胞按照每孔3×105细胞接种于6孔板, 培养过夜, 采用脂质体LipofectamineTM 2000作为转染试剂, 选择miRNA与LipofectamineTM 2000的最佳比例按照说明书进行转染, 培养箱中继续培养4~6 h后, 更换新鲜含血清的培养基。所使用的基因从上海吉玛公司购买, 基因的序列(5'→3'): miRNA inhibitor negative control (inhibitor NC): CAGUACUUUUGUGUAGUACAA; miR-205-5p inhibitor: CAGACUCCGGUGGAAUGAAGGA。转染24 h后收集细胞进行后续实验。给药组在转染24 h后加8 μmol·L-1 DDP处理细胞。
qRT-PCR检测miR-205-5p表达 依据miRNeasy® Mini Kit (德国Qiagen公司)使用说明书提取细胞总miRNA, NanoVueTM Plus光度仪检测RNA浓度和纯度, A260/A280比值需在1.9~2.1之间。利用miScriptRT Kit (Qiagen公司)逆转录RNA, 选择U6作为内参, 引物(Qiagen公司)序列(5'→3')如下: miR-205-5p: F: CTT GTCCTTCATTCCACCGGA, R: TGCCGCCTGAACT TCACTCC; U6: F: CTCGCTTCGGCAGCACATA, R: AACGCTTCACGAATTTGCGT。依据miScript SYBR Green PCR Kit (Qiagen公司)说明书在ABI StepOneTM Real-Time PCR仪进行q-PCR, 每组设3个复孔, 计算复孔的Ct平均值, 按照$2^{-\Delta \Delta C_{t}}$相对定量计算公式得到相对定量结果。
MTT法检测细胞存活率 取生长良好的HNE1细胞和miR-205-5p抑制剂转染前后的HNE1/DDP细胞按照每孔7×103细胞, 种于96孔细胞培养板中, 培养24 h后, 将原培养液更换为含DDP的培养液, DDP的浓度为2、4、8、16、32 μmol·L-1, 另设空白组和只加培养液的阴性对照(不含细胞), 每组5个复孔。加药培养24 h后, 每孔加入15 µL MTT溶液(以PBS配成5 g·L-1)培养4 h, 弃去96孔板中培养液, 每孔加150 μL DMSO, 37 ℃环境中放置30 min, 酶标仪测定490 nm处每孔吸光度值(A)。计算细胞存活率, 实验重复3次。
PI单染检测细胞凋亡 将生长良好的HNE1/DDP和HNE1细胞以每孔1×105的细胞量种于6孔培养板, 分为DDP组(8 μmol·L-1)、转染组(转染miR-205-5p抑制剂)及联合作用组(转染miR-205-5p抑制剂+ 8 μmol·L-1 DDP)。待HNE1/DDP细胞生长汇合至80%左右转染, 联合作用组是先转染miR-205-5p抑制剂, 24 h后更换为含8 μmol·L-1顺铂的培养液, 培养24 h后收集各组细胞, 4 ℃冰箱保存的冷PBS洗3遍, 离心后舍去上清液并转移至离心管中。加入70%冰乙醇固定, 4 ℃冰箱保存过夜, 舍去上清, PBS洗2遍, 加入配制的PI染色液染色4 h, 流式细胞仪检测分析细胞凋亡率。
DAPI染色检测细胞核变化 细胞分组同PI实验。给药培养24 h舍去培养液, 冰冷PBS洗涤2遍, 每孔加入4%多聚甲醛1 mL固定细胞10 min, PBS洗涤3次, 每孔加入800 μL DAPI染色液避光反应20 min, 荧光显微镜观察细胞核形态学变化。
Western blot检测凋亡蛋白表达 消化收集各组HNE1/DDP细胞, 加适量的蛋白裂解液转移至1.5 mL离心管, 冰上裂解半小时, 低温离心(12 000 r·min-1, 30 min), 提取蛋白, 用BCA试剂盒(碧云天)测定蛋白浓度, 并将各组蛋白稀释配平至等浓度。经过12% SDS-PAGE电泳(70 V, 30 min; 120 V, 90 min), 转膜(50 V, 150 min); 5%脱脂牛奶封闭2 h, 一抗室温孵育2 h, 洗膜后二抗孵育2 h; ECL试剂盒暗处显影; Bio-Rad凝胶成像系统获取图像。
统计学方法 使用SPSS 13.0统计软件对数据进行分析, 所有实验数据以均数±标准差表示, Dunnette-t双侧检验进行组间比较, P < 0.05认为有统计学差异。
利用qRT-PCR检测HNE1和HNE1/DDP细胞中miR-205-5p的表达, 与敏感株细胞HNE1相比, 耐药株细胞HNE1/DDP中miR-205-5p的相对表达量明显升高(图 1A, P < 0.05)。提示miR-205-5p可能在耐DDP鼻咽癌细胞中发挥了一定作用。在高表达miR-205-5p的HNE1/DDP细胞中, 转染miR-205-5p抑制剂, 转染24 h收集细胞, 采用qRT-PCR检测细胞中miR-205-5p的相对表达量, 结果表明, 与对照组相比, HNE1/DDP细胞转染miR-205-5p抑制剂后miR-205-5p表达量明显降低(图 1B, P < 0.05), 表明转染成功, miR-205-5p抑制剂可以抑制miR-205-5p的表达。
使用不同浓度的DDP (2、4、8、16、32 μmol·L-1)处理HNE1和转染前后的HNE1/DDP细胞。MTT结果显示, 与敏感株细胞HNE1相比, HNE1/DDP表现出明显的耐药性(图 2A); 随着浓度的增加, 与DDP单独处理相比, miR-205-5p联合DDP明显增加耐药株细胞对DDP的敏感性(图 2B, P < 0.05)。提示鼻咽癌细胞对DDP的耐药性与miR-205-5p表达有关, 下调miR-205-5p可部分逆转鼻咽癌细胞对DDP的耐药。
PI染色后流式细胞技术检测凋亡情况, 如图 3所示, DDP作用于HNE1/DDP细胞的凋亡率明显低于HNE1, 进一步证明HNE1/DDP细胞对DDP的耐药性(P < 0.05)。miR-205-5p抑制剂和DDP (8 μmol·L-1)单独作用于HNE1/DDP细胞的凋亡率分别为(9.83 ± 1.31) %、(10.83 ± 1.70) %, 与对照组(未转染抑制剂未加药)相比有统计学差异(P < 0.05)。miR-205-5p抑制剂联合DDP (8 μmol·L-1)组细胞凋亡率为(28.93 ± 2.50) %, 与对照组和单独处理组相比都有统计学差异(P < 0.05), 且高于单独处理组之和, 提示DDP与下调miR-205-5p具有协同诱导凋亡作用。
DAPI染色后可用荧光显微镜观察细胞核的变化。图 4结果显示:下调miR-205-5p联合DDP (8 μmol·L-1)作用于HNE1/DDP细胞24 h, 细胞核皱缩浓集, 呈现亮蓝色荧光, 细胞核呈分叶、碎片状, 且明显多于对照组和单独处理组。
DDP、转染miR-205-5p抑制剂、二者联合作用于HNE1/DDP后, 蛋白印迹检测Bax、Bak、Mcl-1、Bcl-2蛋白的表达。结果表明, 与对照组和单独处理组相比, miR-205-5p抑制剂联合DDP (8 μmol·L-1)能够明显上调促凋亡蛋白Bax的表达, 并下调抗凋亡蛋白Bcl-2的表达(P < 0.05), 而促凋亡蛋白Bak和抗凋亡蛋白Mcl-1的表达无显著变化(图 5), 提示下调miR-205-5p对HNE1/DDP细胞中DDP诱导凋亡作用可能与上调Bax和下调Bcl-2有关。
对于大多数癌症患者, 化疗是一个非常重要的治疗手段, 但是化疗过程中引起的肿瘤复发、转移及耐药限制了它的发展。尽管过去的50年, 人们对肿瘤耐药的分子机制进行了深入的研究, 但是产生耐药的分子机制是复杂的, 很多还是未知的。化疗治疗肿瘤失败的一个主要原因是由于治疗过程中肿瘤细胞产生肿瘤多药耐药。所以, 研究鼻咽癌细胞耐药机制对鼻咽癌的治疗有着重要的意义。本研究选择鼻咽癌对顺铂耐药细胞(HNE1/DDP细胞)作为主要研究对象, 探究鼻咽癌的耐药机制, 最终提高鼻咽癌的治愈率。
近年来, 越来越多的研究发现miRNA可作为癌基因或抑癌基因在肿瘤的发生、发展及耐药中发挥消极或积极的作用[10, 11]。miRNA作为非编码小分子RNA, 主要通过碱基配对与相应的靶mRNA的3'非编码区结合, 调控靶基因, 从而影响细胞的增殖、凋亡、侵袭、迁移[12, 13]。此外, miRNA在包括癌症在内的许多疾病中异常表达[14]。本课题组前期基因芯片研究发现, 顺铂耐药的NPC细胞中miR-205-5p特异性高表达。因此, 课题组猜测miR-205-5p可能参与顺铂耐药鼻咽癌的调控。近来的研究表明, miR-205与多种肿瘤具有密切关系[15, 16]。miR-205-5p可以通过抑制靶基因Bcl-2的表达, 抑制人皮肤鳞癌细胞的增殖, 诱导凋亡[17]。miR-205-5p通过作用于靶点ZEB 1抑制前列腺癌的细胞迁移和侵袭[18]
qRT-PCR结果进一步证实, 与HNE1细胞相比, HNE1/DDP中miR-205-5p相对表达显著升高。通过转染miR-205-5p抑制剂调控miR-205-5p的表达水平, qRT-PCR结果显示转染后, HNE1/DDP细胞中miR-205-5p表达量降低。MTT结果显示, miR-205-5p抑制剂联合DDP组细胞存活率明显降低, 下调miR-205-5p逆转鼻咽癌细胞对DDP的耐药。
细胞凋亡是涉及一系列基因激活、表达及调控等活动的主动适应环境的死亡过程。大多数的抗肿瘤药物也是通过诱导凋亡发挥抗肿瘤作用。细胞凋亡时形态会发生显著改变, 表现为细胞体积缩小、核质浓缩、核膜核仁破碎和凋亡小体形成。本研究通过流式单染和DAPI染色检测HNE1/DDP的凋亡情况, 结果发现下调miR-205-5p可增强鼻咽癌细胞HNE1/DDP对DDP诱导凋亡的作用。下调miR-205-5p联合DDP作用HNE1/DDP细胞, 细胞核凝缩呈亮蓝色荧光, 核分叶和碎裂明显增加。
Bcl-2家族调控细胞凋亡, 它包括促凋亡蛋白Bak、Bax和抗凋亡蛋白Mcl-1、Bcl-2[19], 当细胞受到外部刺激后, 可促进线粒体膜通透性增加[20]。促凋亡蛋白Bak和Bax主要通过调控细胞色素C、凋亡诱导因子(AIF)发挥作用[21, 22]。Mcl-1和Bcl-2可以保护线粒体膜的完整性, Bcl-2还能够增强线粒体膜电位, 抑制线粒体钙离子的释放, 阻止内切酶活化, 最终抑制肿瘤细胞凋亡[23, 24]。本研究发现, 转染miR-205-5p抑制剂联合DDP可以使HNE1/DDP细胞促凋亡蛋白Bax的表达显著升高, 抗凋亡蛋白Bcl-2的表达显著降低。提示下调miR-205-5p增强HNE1/DDP对顺铂诱导凋亡的敏感性, 可能是通过升高Bax的表达和降低Bcl-2的表达实现。
综上所述, 本研究证明了下调miR-205-5p可增强鼻咽癌耐药细胞(HNE1/DDP)对DDP诱导凋亡的敏感性, 其作用机制可能与促凋亡蛋白Bax的升高和抗凋亡蛋白Bcl-2的下降有关, 但miR-205-5p调节凋亡蛋白表达的具体通路有待于进一步研究。该研究结果可以为提高鼻咽癌临床治疗效果提供新的思路和策略。
  • 国家自然科学基金资助项目(81603155)
  • 蚌埠医学院自然科学基金资助项目(BYKY1763)
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doi: 10.16438/j.0513-4870.2018-1142
  • 接收时间:2018-12-24
  • 首发时间:2026-01-26
  • 出版时间:2019-07-12
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  • 收稿日期:2018-12-24
  • 修回日期:2019-01-23
基金
国家自然科学基金资助项目(81603155)
蚌埠医学院自然科学基金资助项目(BYKY1763)
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    蚌埠医学院药学院, 安徽 蚌埠 233030

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*张配, Tel:86-552-3175452, E-mail:
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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