Zhu C, Zhang S, Xue A, Feng G, Fan S. Elevated BTG2 improves the radiosensitivity of non-small cell lung cancer (NSCLC) through apoptosis.
Thorac Cancer 2022;
13:1441-1448. [PMID:
35388633 PMCID:
PMC9108063 DOI:
10.1111/1759-7714.14410]
[Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 03/18/2022] [Accepted: 03/21/2022] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND
To identify radio-responsive genes and explore the biological function of encoded proteins in non-small cell lung cancer (NSCLC).
METHODS
Radio-responsive genes in irradiated H460 cells were screened from microarray data deposited in the Gene Expression Omnibus (GEO) database. A quantitative real time polymerase chain reaction assay was used to detect the expression of candidate radio-responsive genes in irradiated cells. CCK-8 assay, EDU assay, clone formation assay, immunofluorescence and flow cytometry were conducted to evaluate the biological function of B cell translocation gene 2 (BTG2) in NSCLC.
RESULTS
Bioinformatic analysis using GES20549 showed that BTG2 was a radio-responsive gene in irradiated H460 cells. The mRNA expression level of BTG2 was lower in H460 cells compared with that in BEAS-2B normal lung epithelial cells. BTG2 expression was elevated upon IR exposure, in a dose-dependent but not a time-dependent manner. CCK-8 and EDU assays revealed that BTG2 overexpression inhibited the growth rate of irradiated cells. Clone formation showed that elevated BTG2 promoted DNA damage of irradiated H460 cells. The number of γ-H2AX foci induced by DNA damage was also markedly increased upon BTG2 overexpression. Flow cytometry showed that BTG2 increased IR-induced cell apoptosis.
CONCLUSIONS
BTG2 may be a novel radio-responsive factor and a promising therapeutic target for radiotherapy of NSCLC.
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