title: miRNA-148b regulates radioresistance in non-small lung cancer cells via regulation of MutL homologue 1.
abstract: Radioresistance represents a major obstacle in cancer treatment, the underlying mechanism of which is complex and not well understood. miR-148b has been reported to be implicated regulating radioresistance in lymphoma cells. However, this function has not been investigated in lung cancer cells. Microarray analysis was performed in A549 cells 48 h after exposure to 8 Gy of γ-irradiation or sham irradiation to identify differentially expressed miRNAs. miR-148b mimic and inhibitor were transfected, followed by clonogenic survival assay to examine response to irradiation in A549 cells. Western Blot and luciferase assay were performed to investigate the direct target of miR-148b Xenograft mouse models were used to examine in vivo function of miR-148b Our data showed that expression of miR-148b was significantly down-regulated in both serum and cancerous tissues of radioresistant lung cancer patients compared with radiosensitive patients. Overexpression of miR-148b reversed radioresistance in A549 cells. MutL homologue 1 (MLH1) is the direct target of miR-148b which is required for the regulatory role of miR-148b in radioresistance. miR-148b mimic sensitized A549 xenografts to irradiation in vivo Our study demonstrated that miR-148b regulates radioresistance of lung cancer cells by modulating MLH1 expression level. miR-148b may represent a new therapeutic target for the intervention of lung cancer.
authors.affiliation: Department of Radiotherapy, The Tumor Hospital of Shandong Province, No. 440 of Jiyan Road, Ji'nan 250000, Shandong Province, China Department of Radiotherapy, The Central Hospital of Zibo, No. 54 of Gongqingtuan West Road 54, Zhangdian District, Zibo 255000, Shandong Province, China.
authors.forename: Guangsheng
authors.initials: G
authors.lastname: Zhai
authors.affiliation: Division of Gastroenterology, Department of Medicine, The Second Hospital of Shandong University, No. 54 of Gongqingtuan West Road 54, Zhangdian District, Zibo 255000, Shandong Province, China.
authors.forename: Gaozhong
authors.initials: G
authors.lastname: Li
authors.affiliation: Department of Radiotherapy, The Central Hospital of Zibo, No. 54 of Gongqingtuan West Road 54, Zhangdian District, Zibo 255000, Shandong Province, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Xu
authors.affiliation: No. 1 Oncology Department, The Central Hospital of Zibo, No. 54 of Gongqingtuan West Road 54, Zhangdian District, Zibo 255000, Shandong Province, China.
authors.forename: Tongfu
authors.initials: T
authors.lastname: Jia
authors.affiliation: No. 3 Oncology Department, The Central Hospital of Zibo, No. 54 of Gongqingtuan West Road 54, Zhangdian District, Zibo 255000, Shandong Province, China.
authors.forename: Yinping
authors.initials: Y
authors.lastname: Sun
authors.affiliation: Department of Urology Surgery, The Central Hospital of Zibo, No. 54 of Gongqingtuan West Road 54, Zhangdian District, Zibo 255000, Shandong Province, China.
authors.forename: Jianbo
authors.initials: J
authors.lastname: Zheng
authors.affiliation: Department of Radiotherapy, The Tumor Hospital of Shandong Province, No. 440 of Jiyan Road, Ji'nan 250000, Shandong Province, China 18678186986@163.com.
authors.forename: Jianbin
authors.initials: J
authors.lastname: Li
mesh_terms: D000072283:A549 Cells; D000818:Animals; D002289:Carcinoma, Non-Small-Cell Lung / Q000235:genetics / Q000473:pathology / Q000532:radiotherapy*; D005720:Gamma Rays; D015972:Gene Expression Regulation, Neoplastic / Q000528:radiation effects; D064593:Heterografts; D006801:Humans; D051379:Mice; D035683:MicroRNAs / Q000235:genetics*; D046228:Microarray Analysis; D000070957:MutL Protein Homolog 1 / Q000235:genetics*; D011836:Radiation Tolerance / Q000235:genetics*
chemical_list: C000599482:MIRN1539 microRNA, human; D035683:MicroRNAs; D000070957:MutL Protein Homolog 1
keywords: MutL homologue 1 (MLH1); lung cancer; miR-148b; radioresistance