Cell Biology and Toxicology

, Volume 28, Issue 3, pp 161–173 | Cite as

Differential response of three cell types to dual stress of nitric oxide and radiation

  • Fatema A. Dhariwala
  • Himanshi Narang
  • Malini Krishna
Original Research


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.


Nitric oxide Irradiation Sodium nitroprusside (SNP) S-Nitroso-N-acetyl-dl-penicillamine (SNAP) Apoptosis Cell cycle 


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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Fatema A. Dhariwala
    • 1
  • Himanshi Narang
    • 1
  • Malini Krishna
    • 1
  1. 1.Radiation Biology and Health Sciences DivisionBhabha Atomic Research CentreMumbaiIndia

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