温州医科大学学报
溫州醫科大學學報
온주의과대학학보
Journal of Wenzhou Medical University
2015年
6期
430-433,436
,共5页
项振飞%陆妙珍%张欢乐%张三典
項振飛%陸妙珍%張歡樂%張三典
항진비%륙묘진%장환악%장삼전
PLAGL1%结直肠肿瘤%DNA甲基化%表观遗传学
PLAGL1%結直腸腫瘤%DNA甲基化%錶觀遺傳學
PLAGL1%결직장종류%DNA갑기화%표관유전학
PLAGL1%colorectal neoplasms%DNA methglation%epigenetics
目的:研究PLAGL1在结直肠癌中的表达及其作用机制。方法:应用半定量反转录PCR(RT-PCR)、甲基化特异性PCR(MSP)法检测PLAGL1在结直肠癌细胞系及组织中的表达和甲基化状态。通过MTT增殖实验、克隆形成、细胞周期等实验探讨PLAGL1在结直肠癌中的作用。结果:PLAGL1在结直肠癌细胞系HCT116和DLD1中呈完全甲基化,在SW620、SW480中呈半甲基化,在RKO中为非甲基化状态;PLAGL1在104例结直肠癌组织中的甲基化率为64.4%;PLAGL1甲基化与结直肠癌患者的TNM分期显著相关(P<0.001),同时PLAGL1甲基化与结直肠癌患者的淋巴结转移显著相关(P<0.001),而与结直肠癌患者的性别、年龄以及肿瘤分化程度未见显著相关性;PLAGL1的恢复表达可以明显抑制HCT116细胞的增殖(P<0.05),HCT116细胞的克隆形成数在PLAGL1恢复表达后明显减少;恢复表达PLAGL1后HCT116细胞在G1期的比率明显增加。结论:PLAGL1在结直肠癌中的表达受DNA甲基化的调控,恢复表达PLAGL1后可以抑制结肠癌细胞HCT116的增殖,并使HCT116细胞周期阻滞在G1期,PLAGL1在结直肠癌中起到抑癌基因的作用。
目的:研究PLAGL1在結直腸癌中的錶達及其作用機製。方法:應用半定量反轉錄PCR(RT-PCR)、甲基化特異性PCR(MSP)法檢測PLAGL1在結直腸癌細胞繫及組織中的錶達和甲基化狀態。通過MTT增殖實驗、剋隆形成、細胞週期等實驗探討PLAGL1在結直腸癌中的作用。結果:PLAGL1在結直腸癌細胞繫HCT116和DLD1中呈完全甲基化,在SW620、SW480中呈半甲基化,在RKO中為非甲基化狀態;PLAGL1在104例結直腸癌組織中的甲基化率為64.4%;PLAGL1甲基化與結直腸癌患者的TNM分期顯著相關(P<0.001),同時PLAGL1甲基化與結直腸癌患者的淋巴結轉移顯著相關(P<0.001),而與結直腸癌患者的性彆、年齡以及腫瘤分化程度未見顯著相關性;PLAGL1的恢複錶達可以明顯抑製HCT116細胞的增殖(P<0.05),HCT116細胞的剋隆形成數在PLAGL1恢複錶達後明顯減少;恢複錶達PLAGL1後HCT116細胞在G1期的比率明顯增加。結論:PLAGL1在結直腸癌中的錶達受DNA甲基化的調控,恢複錶達PLAGL1後可以抑製結腸癌細胞HCT116的增殖,併使HCT116細胞週期阻滯在G1期,PLAGL1在結直腸癌中起到抑癌基因的作用。
목적:연구PLAGL1재결직장암중적표체급기작용궤제。방법:응용반정량반전록PCR(RT-PCR)、갑기화특이성PCR(MSP)법검측PLAGL1재결직장암세포계급조직중적표체화갑기화상태。통과MTT증식실험、극륭형성、세포주기등실험탐토PLAGL1재결직장암중적작용。결과:PLAGL1재결직장암세포계HCT116화DLD1중정완전갑기화,재SW620、SW480중정반갑기화,재RKO중위비갑기화상태;PLAGL1재104례결직장암조직중적갑기화솔위64.4%;PLAGL1갑기화여결직장암환자적TNM분기현저상관(P<0.001),동시PLAGL1갑기화여결직장암환자적림파결전이현저상관(P<0.001),이여결직장암환자적성별、년령이급종류분화정도미견현저상관성;PLAGL1적회복표체가이명현억제HCT116세포적증식(P<0.05),HCT116세포적극륭형성수재PLAGL1회복표체후명현감소;회복표체PLAGL1후HCT116세포재G1기적비솔명현증가。결론:PLAGL1재결직장암중적표체수DNA갑기화적조공,회복표체PLAGL1후가이억제결장암세포HCT116적증식,병사HCT116세포주기조체재G1기,PLAGL1재결직장암중기도억암기인적작용。
Objective: Epigenetic alterations have played an important role in colorectal carcinogenesis. PLAGL1 (pleiomorphic adenoma gene-like 1, Also known asZAC; LOT1; ZAC1) is a gene associated with the development of many types of cancers. Our aims are to explore the expression and the function of PLAGL1 in colorectal cancer.Methods: RT-PCR (semi-quantitative reverse-transcription PCR) was used in this study to detect the expression level of PLAGL1 in colorectal cancer cell lines. The methylation of PLAGL1 promoter regain was detected with MSP (methylation speciifc PCR) in colorectal cancer cell lines and colorectal cancer tissues. MTT assay, colony formation and cell cycle analysis were used to explore the function of PLAGL1 in colorectal carcinogenesis.Results: The expression of PLAGL1 in colorectal cancer cell lines was regulated by promoter regain methylation. And PLAGL1 was frequently methylated in 64.4% (67/104) colorectal cancer tis-sue. Restoration of PLAGL1 expression in HCT116 inhibited cell proliferation and colony formation, and cell cycle of HCT116 was arrested at G1 phase.Conclusion: The expression of PLAGL1 in colorectal cancer is regu-latied by DNA methylation.The restoration of PLAGL1 can suppressed the proliferation of colorectal cancer cell HCT116, and also arrest the cell cycle of HCT116 in G1 phase. PLAGL1 acts as a tumor suppressor in colorectal carcinogenesis.