Irradiation induces a biphasic expression of pro-inflammatory cytokines in the lung

Strahlentherapie und Onkologie : Organ der Deutschen Röntgengesellschaft ... [et al]
C E RubeC Rube

Abstract

The precise pathophysiological mechanisms of radiation-induced lung injury are poorly understood, but have been shown to correlate with dysregulation of different cytokines. The purpose of this study was to evaluate the time course of the pro-inflammatory cytokines tumor necrosis factor-(TNF-)alpha, interleukin-(IL-)1alpha and IL-6 after whole-lung irradiation. The thoraces of C57BL/6J mice were irradiated with 12 Gy. Treated and control mice were sacrificed at 0.5, 1, 3, 6, 12, 24, 48, 72 h, 1, 2, 4, 8, 16, and 24 weeks post irradiation (p. i.). Real-time multiplex RT-PCR (reverse transcriptase polmyerase chain reaction) was established to evaluate the expression of TNF-alpha, IL-1alpha and IL-6 in the lung tissue of the mice. For histological analysis, lung tissue sections were stained by hematoxylin and eosin. Multiplex RT-PCR analysis revealed a biphasic expression of these pro-inflammatory cytokines in the lung tissue after irradiation. After an initial increase at 1 h p. i. for TNF-alpha and at 6 h p. i. for IL-1alpha and IL-6, the mRNA expression of these pro-inflammatory cytokines returned to basal levels (48 h, 72 h, 1 week, 2 weeks p. i.). During the pneumonic phase, TNF-alpha, IL-1alpha and IL-6 were significantly el...Continue Reading

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