Cell killing, nuclear damage and apoptosis in Chinese hamster V79 cells after irradiation with heavy-ion beams of (16)O, (12)C and (7)Li.
Chinese hamster V79 cells were exposed to high LET (linear energy transfer) (16)O-beam (625keV/mum) radiation in the dose range of 0-9.83Gy. Cell survival, micronuclei (MN), chromosomal aberrations (CA) and induction of apoptosis were studied as a follow up of our earlier study on high LET radiations ((7)Li-beam of 60keV/mum and (12)C-beam of 295keV/mum) as well as (60)Co gamma-rays. Dose dependent decline in surviving fraction was noticed along with the increase of MN frequency, CA frequency as well as percentage of apoptosis as detected by nuclear fragmentation assay. The relative intensity of DNA ladder, which is a useful marker for the determination of the extent of apoptosis induction, was also increased in a dose dependent manner. Additionally, expression of tyrosine kinase lck-1 gene, which plays an important role in response to ionizing radiation induced apoptosis, was increased with the increase of radiation doses and also with incubation time. The present study showed that all the high LET radiations were generally more effective in cell killing and inflicting other cytogenetic damages than that of low LET gamma-rays. The dose response curves revealed that (7)Li-beam was most effective in cell killing as well as inducing other nuclear damages followed by (12)C, (16)O and (60)Co gamma-rays, in that order. The result of this study may have some application in biological dosimetry for assessment of genotoxicity in heavy ion exposed subjects and in determining suitable doses for radiotherapy in cancer patients where various species of heavy ions are now being generally used.
Pathak
Rupak
R
Department of Biotechnology, West Bengal University of Technology, Salt Lake Sector-I, Kolkata 700064, India.
Dey
Subrata Kumar
SK
Sarma
Asiti
A
Khuda-Bukhsh
Anisur Rahman
AR
D000818:Animals; D017209:Apoptosis / Q000528:radiation effects*; D002250:Carbon Radioisotopes / Q000494:pharmacology*; D016923:Cell Death / Q000528:radiation effects; D002470:Cell Survival / Q000528:radiation effects; D002478:Cells, Cultured; D006224:Cricetinae; D003412:Cricetulus; D004249:DNA Damage; D053938:DNA Fragmentation / Q000528:radiation effects; D020450:Heavy Ions; D018499:Linear Energy Transfer; D018020:Lithium Compounds / Q000494:pharmacology*; D008677:Metaphase / Q000528:radiation effects; D015162:Micronucleus Tests; D010104:Oxygen Radioisotopes / Q000494:pharmacology*; D011868:Radioisotopes / Q000494:pharmacology; D011879:Radiotherapy Dosage
D002250:Carbon Radioisotopes; D018020:Lithium Compounds; D010104:Oxygen Radioisotopes; D011868:Radioisotopes