title: The Expression of miR-375 Is Associated with Carcinogenesis in Three Subtypes of Lung Cancer.
abstract: Many studies demonstrated unique microRNA profiles in lung cancer. Nonetheless, the role and related signal pathways of miR-375 in lung cancer are largely unknown. Our study investigated relationships between carcinogenesis and miR-375 in adenocarcinoma, squamous cell carcinoma and small cell lung carcinoma to identify new molecular targets for treatment. We evaluated 723 microRNAs in microdissected cancerous cells and adjacent normal cells from 126 snap-frozen lung specimens using microarrays. We validated the expression profiles of miR-375 and its 22 putative target mRNAs in an independent cohort of 78 snap-frozen lung cancer tissues using quantitative reverse-transcriptase PCR. Moreover, we performed dual luciferase reporter assay and Western blot on 6 targeted genes (FZD8, ITGA10, ITPKB, LRP5, PIAS1 andRUNX1) in small cell lung carcinoma cell line NCI-H82. We also detected the effect of miR-375 on cell proliferation in NCI-H82. We found that miR-375 expression was significantly up-regulated in adenocarcinoma and small cell lung carcinoma but down-regulated in squamous cell carcinoma. Among the 22 putative target genes, 11 showed significantly different expression levels in at least 2 of 3 pair-wise comparisons (adenocarcinoma vs. normal, squamous cell carcinoma vs. normal or small cell lung carcinoma vs. normal). Six targeted genes had strong negative correlation with the expression level of miR-375 in small cell lung carcinoma. Further investigation revealed that miR-375 directly targeted the 3'UTR of ITPKB mRNA and over-expression of miR-375 led to significantly decreased ITPKB protein level and promoted cell growth. Thus, our study demonstrates the differential expression profiles of miR-375 in 3 subtypes of lung carcinomas and finds thatmiR-375 directly targets ITPKB and promoted cell growth in SCLC cell line.
authors.affiliation: Department of Pathology, School of Basic Medical Science, Fudan University, Shanghai, China.|Department of Pathology, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Jin
authors.affiliation: Department of Pathology, Zhongshan Hospital, Fudan University, Shanghai, China.
authors.forename: Yalan
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Key Laboratory of Molecular Medicine, Ministry of Education, Institute of Medical Sciences, Department of Biochemistry and Molecular Biology, Shanghai Medical College, Fudan University, Shanghai, China.
authors.forename: Jin
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Thoracic Surgery, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Huang
authors.affiliation: Department of Pulmonary Medicine, Zhongshan Hospital, Fudan University, Shanghai, China.
authors.forename: Hongni
authors.initials: H
authors.lastname: Jiang
authors.affiliation: Department of Pathology, Zhongshan Hospital, Fudan University, Shanghai, China.
authors.forename: Yingyong
authors.initials: Y
authors.lastname: Hou
authors.affiliation: Department of Pathology, Zhongshan Hospital, Fudan University, Shanghai, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Xu
authors.affiliation: Department of Pathology, Zhongshan Hospital, Fudan University, Shanghai, China.
authors.forename: Changwen
authors.initials: C
authors.lastname: Zhai
authors.affiliation: Department of Pathology, Huashan Hospital, Fudan University, Shanghai, China.
authors.forename: Xue
authors.initials: X
authors.lastname: Gao
authors.affiliation: Department of Pathology, School of Basic Medical Science, Fudan University, Shanghai, China.
authors.forename: Shuyang
authors.initials: S
authors.lastname: Wang
authors.affiliation: Department of Pathology, School of Basic Medical Science, Fudan University, Shanghai, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wu
authors.affiliation: Department of Pathology, School of Basic Medical Science, Fudan University, Shanghai, China.|Department of Pathology, Huashan Hospital, Fudan University, Shanghai, China.
authors.forename: Hongguang
authors.initials: H
authors.lastname: Zhu
authors.affiliation: Department of Pathology, Zhongshan Hospital, Fudan University, Shanghai, China.
authors.forename: Shaohua
authors.initials: S
authors.lastname: Lu
mesh_terms: D000230:Adenocarcinoma / Q000145:classification / Q000378:metabolism* / Q000473:pathology; D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000145:classification / Q000378:metabolism* / Q000473:pathology; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008175:Lung Neoplasms / Q000145:classification / Q000378:metabolism* / Q000473:pathology; D008297:Male; D035683:MicroRNAs / Q000378:metabolism*; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000096:biosynthesis*; D012334:RNA, Neoplasm / Q000378:metabolism*; D055752:Small Cell Lung Carcinoma / Q000145:classification / Q000378:metabolism* / Q000473:pathology
chemical_list: C540933:MIRN375 microRNA, human; D035683:MicroRNAs; D009363:Neoplasm Proteins; D012334:RNA, Neoplasm