title: Studies on best dose of X-ray for Hep-2 cells by using FTIR, UV-vis absorption spectroscopy and flow cytometry.
abstract: We report here the use of Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible (UV-vis) absorption spectroscopy, and flow cytometry (FCM) to analysis the best dose of X-ray for human laryngeal squamous cell carcinoma cell lines (Hep-2). Our analysis indicates specific FTIR and UV-vis spectral differences between X-irradiated and normal Hep-2 cells. In addition, striking spectral differences are seen in FTIR spectra in the ratios at 2925/2958 and 1654/1542 cm(-1). These two ratios of the X-irradiated cells for 8 Gy dose group with value of 1.07+/-0.025 and 1.184+/-0.013, respectively, were more notable (mean+/-S.D., n=5, P<0.05) compared with that of the cells for the controls. UV-vis absorption spectra analysis shows X-ray irradiation disturbed the metabolism of phenylalanine and tyrosine intracellular, maybe, which was caused by cell cycle arrest. Spectroscopy analysis suggests 8 Gy is a better dose of X-ray for lowering the canceration degree of Hep-2 cells. Moreover, FCM analysis shows the apoptosis of X-irradiated cells depended on the radiation dose to some extent, but it was not linear. The total apoptosis ratio with value of (20.793+/-1.133)% (P<0.01, n=5) for the 12 Gy dose group was the maximum, however, the maximum apoptosis ratio per Gray (total apoptosis ratio/radiation dose) was the cells of the 2 Gy dose group with value of (4.887+/-0.211)% (P<0.05, n=5). Our data suggest that Hep-2 cells are given 2 Gy radiation of X-ray once a time, 8 Gy per week (accumulatively), the effect for lowering the canceration degree and restraining the proliferation of Hep-2 cells will be better.
authors.affiliation: Department of Physics and Electronics Science, Chuxiong Normal University, Chuxiong 675000, China. liurenmingok@126.com
authors.forename: Renming
authors.initials: R
authors.lastname: Liu
authors.forename: Weiyue
authors.initials: W
authors.lastname: Tang
authors.forename: Yipu
authors.initials: Y
authors.lastname: Kang
authors.forename: Minzhen
authors.initials: M
authors.lastname: Si
mesh_terms: D017209:Apoptosis / Q000528:radiation effects*; D002294:Carcinoma, Squamous Cell / Q000532:radiotherapy*; D045744:Cell Line, Tumor; D004307:Dose-Response Relationship, Radiation; D004847:Epithelial Cells / Q000473:pathology / Q000528:radiation effects; D005434:Flow Cytometry; D006801:Humans; D007822:Laryngeal Neoplasms / Q000532:radiotherapy*; D013053:Spectrophotometry; D017550:Spectroscopy, Fourier Transform Infrared; D014965:X-Rays