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Response of a Human Melanoma Cell Line to Low and High Ionizing Radiation
Author(s) -
RISTICFIRA ALEKSANDRA M.,
TODOROVIC DANIJELA V.,
KORICANAC LELA B.,
PETROVIC IVAN M.,
VALASTRO LUCIA M.,
CIRRONE PABLO G.A.,
RAFFAELE LUIGI,
CUTTONE GIACOMO
Publication year - 2007
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1196/annals.1397.020
Subject(s) - irradiation , radioresistance , apoptosis , ionizing radiation , cell cycle , cell growth , cell culture , viability assay , programmed cell death , chemistry , cell , incubation , radiosensitivity , microbiology and biotechnology , radiochemistry , cancer research , biology , biochemistry , physics , genetics , nuclear physics
: Effects of single irradiation with gamma rays and protons on human HTB140 melanoma cell growth were compared. Exponentially growing cells were irradiated close to the Bragg peak maximum of the unmodulated 62 MeV protons, as well as with 60 Co gamma rays. Applied doses ranged from 8 to 24 Gy. Viability of cells and proliferation capacity were assessed 7 days after irradiation. Induction of apoptosis and cell cycle phase redistribution were observed 6 and 48 h after irradiation.Significant inhibitory effects of both irradiation qualities were detected 7 days after irradiation. Important reduction of HTB140 cell viability was observed after irradiation with protons. Almost linear and highly significant ( P < 0.001) decrease of cell proliferation was observed 7 days after irradiation with gamma rays and protons, as compared to nonirradiated controls. Protons induced apoptosis, both 6 and 48 h after irradiation. With the increase of post‐irradiation incubation time, number of apoptotic cells decreased. Exposure of HTB140 cells to gamma rays did not provoke apoptotic cell death. Important number of cells in G1‐S phase, detected by the cell cycle phase redistribution analyses, suggested high metabolic activity of irradiated melanoma cells within the first 48 h. Both irradiation qualities caused modest G2‐M arrest 6 and 48 h after irradiation, thus supporting results that illustrated high radioresistance of HTB140 cells.