title: Differential response of three cell types to dual stress of nitric oxide and radiation.
abstract: The perception of toxicity to nitric oxide (NO) and irradiation (IR) by three different cell types has been studied. The three cell types are the macrophage like RAW264.7 cells, EL4 lymphoma cells, and splenocytes, which represent the different components of a tumor. These three cell types respond differently to NO donors (SNP and SNAP) and radiation treatment. The macrophages were found to be most radio-resistant and insensitive to NO donors. The innate resistance of the macrophages was not due to its antioxidant defense system since there was no significant activation of the enzymes (superoxide dismutases, catalase, and glutathione peroxidase) in RAW264.7 cells after NO donor and irradiation. But the cell cycle arrest of the three cell types was different from each other. The EL4 cells were found to arrest in the G2/M phase while the macrophages were found arrested in the G1 phase of the cell cycle. Such specific killing of the tumor cell in response to NO donor while sparing the macrophages can be of immense importance to radiotherapy.
authors.affiliation: Radiation Biology and Health Sciences Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
authors.forename: Fatema A
authors.initials: FA
authors.lastname: Dhariwala
authors.forename: Himanshi
authors.initials: H
authors.lastname: Narang
authors.forename: Malini
authors.initials: M
authors.lastname: Krishna
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000378:metabolism; D002374:Catalase / Q000378:metabolism; D059447:Cell Cycle Checkpoints; D045744:Cell Line, Tumor; D002470:Cell Survival; D053938:DNA Fragmentation; D004789:Enzyme Activation; D005720:Gamma Rays / Q000009:adverse effects*; D005979:Glutathione Peroxidase / Q000378:metabolism; D008264:Macrophages / Q000187:drug effects* / Q000378:metabolism / Q000528:radiation effects*; D008297:Male; D051379:Mice; D009569:Nitric Oxide / Q000378:metabolism / Q000633:toxicity*; D020030:Nitric Oxide Donors / Q000633:toxicity; D009599:Nitroprusside / Q000633:toxicity; D026423:S-Nitroso-N-Acetylpenicillamine / Q000633:toxicity; D013482:Superoxide Dismutase / Q000378:metabolism; D018675:Toxicity Tests / Q000379:methods
chemical_list: D000975:Antioxidants; D020030:Nitric Oxide Donors; D009599:Nitroprusside; D009569:Nitric Oxide; D026423:S-Nitroso-N-Acetylpenicillamine; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase