Increased expression of telomere-related proteins correlates with resistance to radiation in human laryngeal cancer cell lines.
Telomere-associated proteins function as survival factors in telomere maintenance, which are major contributors to radiosensitivity in human cancers. The aim of this study was to investigate the association of telomere-associated gene expression and radiation resistance in human larynx squamous carcinoma. The changes of telomere-associated gene expressions and bionomical characteristics that occur in two human larynx squamous carcinoma cell lines (Hep-2 and Hep-2R), with different radiosensitivities in vitro were explored in the present study. Based on previous research, elevated POT1 and TPP1 expressions were detected by reverse transcription-PCR and Western blotting in Hep-2R cell lines. Furthermore, Hep-2R cells showed increased recovery ratio accompanied by a reduction of cell arrested in G2/S phase, suggesting that the radioresistance of Hep-2R cells was due to a faster growth in which telomere length had recently been demonstrated to be a powerful prognostic marker. These results manifest that radioresistant Hep-2R cell lines showed certain changes in gene expression and bionomical profiles that are different from the profile changes of the more-sensitive Hep-2 cell lines, and that evaluation of telomere-associated genes may be a prognostic marker for response to radiotherapy in larynx squamous cell carcinoma (LSCC).
Tang
Tian
T
Department of Radio-Chemotherapy, Zhongnan Hospital, Wuhan University, Wuhan 430071, P.R. China.
Zhou
Fu-Xiang
FX
Lei
Han
H
Yu
Hai-Jun
HJ
Xie
Cong-Hua
CH
Zhou
Yun-Feng
YF
Liu
Shi-Quan
SQ
D015153:Blotting, Western; D002294:Carcinoma, Squamous Cell / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D002453:Cell Cycle / Q000528:radiation effects; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000528:radiation effects; D002470:Cell Survival / Q000528:radiation effects; D004307:Dose-Response Relationship, Radiation; D015972:Gene Expression Regulation, Neoplastic / Q000528:radiation effects; D006801:Humans; D007822:Laryngeal Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D011836:Radiation Tolerance; D020133:Reverse Transcriptase Polymerase Chain Reaction; D000089804:Shelterin Complex; D034501:Telomere-Binding Proteins / Q000235:genetics / Q000378:metabolism / Q000528:radiation effects*; D015854:Up-Regulation
C495876:ACD protein, human; C440849:POT1 protein, human; D000089804:Shelterin Complex; D034501:Telomere-Binding Proteins