Radioprotective Effect of Cyclo(L-Phenylalanyl-L-Prolyl) on Irradiated Rat Lung

  • Published : 2008.02.29

Abstract

In the present study, we investigated the radioprotective effect of cyclo(L-phenylalanyl-L-prolyl) on irradiated rat lungs to determine its potential as a radioprotective agent. We found that early lung damage induced by irradiation was reduced by treatment with 40mg/kg of cyclo(L-phenylalanyl-L-prolyl) in the latent and early pneumonitis phases. Expression of $TNF-{\alpha}\;and\;TGF-{\beta}1$ at 2 and TGF-${\beta}1$ at 8 weeks post-irradiation was decreased in animals that received both radiation and cyclo(L-phenylalanyl-L-prolyl) compared with animals that received radiation alone. Evidence indicated that the proinflammatory cytokine TNF-${\alpha}$ and the fibrogenic cytokine TGF-${\beta}1$ likely play a role in the radioprotective effect of cyclo(L-phenylalanyl-L-prolyl). However, besides TNF-${\alpha}$ and TGF-${\beta}1$ expressions, the precise mechanism by which cyclo(L-phenylalanyl-L-prolyl) ameliorates the induced radiation damage is not clear.

Keywords

References

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