Alteration in the expression of signaling parameters following carbon ion irradiation.
Ionizing radiation induces DNA damage, which generates a complex array of genotoxic responses. These responses depend on the type of DNA damage, which in turn can lead to unique cellular responses. High LET radiation results in clustered damages. This evokes specific signaling responses, which can be cytotoxic or cytoprotective in nature. In the present study the effect of carbon ion irradiation on p 44/42 MAPK and NF-kappaB, which are essentially survival factors, have been studied. Moreover, the effect of inhibition of DNA-PK, which is an important component of DNA repair mechanism, with wortmanin on these signaling factors has been studied. The expression of p 44/42 MAPK was different at 0.1 Gy and 1 Gy and wortmanin was found to inhibit its expression. NF-kappaB expression was higher at 1 Gy than at 0.1 Gy and its expression is unaffected by inhibition of DNA-PK. The notable findings of this study are that the responses to high and low dose of high LET radiation are essentially different and the 6 h time point post irradiation is crucial in deciding the response and needs further investigation.
Mitra
Anirban Kumar
AK
Radiation Biology and Health Sciences Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
Bhat
Nagesh
N
Sarma
Asitikanta
A
Krishna
Malini
M
D000730:Androstadienes / Q000494:pharmacology; D000818:Animals; D002244:Carbon / Q000737:chemistry* / Q000494:pharmacology*; D002460:Cell Line; D006224:Cricetinae; D003412:Cricetulus; D004249:DNA Damage / Q000528:radiation effects; D051747:DNA-Activated Protein Kinase / Q000096:biosynthesis; D004307:Dose-Response Relationship, Radiation; D048049:Extracellular Signal-Regulated MAP Kinases / Q000096:biosynthesis / Q000378:metabolism; D005786:Gene Expression Regulation / Q000528:radiation effects*; D016328:NF-kappa B / Q000096:biosynthesis; D011839:Radiation, Ionizing; D015398:Signal Transduction / Q000528:radiation effects*; D013997:Time Factors; D000077191:Wortmannin
D000730:Androstadienes; D016328:NF-kappa B; D002244:Carbon; D051747:DNA-Activated Protein Kinase; D048049:Extracellular Signal-Regulated MAP Kinases; D000077191:Wortmannin