Abstract:
BACKGROUND:The aim of this study was to determine whether radiation (RT)-induced inflammatory responses and organ damage might be modulated by androgen deprivation therapies. METHODS:The mRNA and tissue sections obtained from the lungs, intestines and livers of irradiated mice with or without androgen deprivation were analyzed by real-time PCR and histological analysis. Activation of NF-kappa B was examined by measuring nuclear protein levels in the intestine and lung 24 h after irradiation. We also examined the levels of cyclooxygenase-2 (COX-2), TGF-beta1 and p-AKT to elucidate the related pathway responsible to irradiation (RT) -induced fibrosis. RESULTS:We found androgen deprivation by castration significantly augmented RT-induced inflammation, associated with the increase NF-kappaB activation and COX-2 expression. However, administration of flutamide had no obvious effect on the radiation-induced inflammation response in the lung and intestine. These different responses were probably due to the increase of RT-induced NF-kappaB activation and COX-2 expression by castration or lupron treatment. In addition, our data suggest that TGF-beta1 and the induced epithelial-mesenchymal transition (EMT) via the PI3K/Akt signaling pathway may contribute to RT-induced fibrosis. CONCLUSION:When irradiation was given to patients with total androgen deprivation, the augmenting effects on the RT-induced inflammation and fibrosis should take into consideration for complications associated with radiotherapy.
journal_name
BMC Cancerjournal_title
BMC cancerauthors
Wu CT,Chen WC,Lin PY,Liao SK,Chen MFdoi
10.1186/1471-2407-9-92subject
Has Abstractpub_date
2009-03-25 00:00:00pages
92issn
1471-2407pii
1471-2407-9-92journal_volume
9pub_type
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