Effect of TGF-β1 and IL-1β expression in serum on acute radiation-induced heart disease

Abstract

Objective To evaluate the effect of TGF-β1 and IL-1β expression in serum on acute radiation-induced heart disease (RIHD) in patients with thoracic tumors.Methods Three-dimensional conformal radiotherapy (3D-CRT) or intensity modulated radiotherapy (IMRT) was delivered at 1.8-2.0 Gy,5 times per week to a total dose of 50-66 Gy to 44 patients with lung cancer and 10 patients with esophagus cancer.The target and organs at risk dose distribution were analyzed by 3-dimensiond treatment planning system.The expressions of TGF-β1 and IL-1β in serum were detected by enzyme linked immunosorbent assay before and at the end of the irradiation.The cardiac injury was evaluated by detecting the cmyocardium creatase,cardiac troponin I (cTnI),electrocardiogram and cardiac function before and at the end of the irradiation within 90 d.The acute RIHD was evaluated by the Common Terminology Criteria V 3.0 (NCI-CTCAE 3.0).The expressions of TGF-β1 and IL-1β in the serum of RIHD patients with thoracic tumors were analyzed.Results The expression of TGF-β1 in serum was (888.4 ± 41.1) μg/L before the irradiation and approached to (926.1 ± 23.1) μg/L at the end of the radiotherapy.The expression level of TGF-β1 in the serum of acute RIDH group was (900.6 ± 34.5) μg/L,higher than that of normal group [(865.7 ±47.0) μg/L,t =-2.646,P ＜0.05)].The acute RIDH was correlated with the expression level of TGF-β1 before irradiation and the difference before and at the end of irradiation (r =0.378,0.311,P ＜0.05).The IL-1β expression had no significant difference before and after irradiation.The expression of TGF-β1 in serum before and at the end of irradiation had positive correlation with the expression of IL-1β at the end of the irradiation (r =0.416,0.389,P ＜ 0.05).Conclusions The expression of TGF-β1 in the serum of patients with thoracic tumor increases after irradiation and correlated with the acute RIHD,but the expression of IL-1β in serum has no relationship with RIHD.TGF-β1 could induce the expression of IL-1β at the end of the irradiation. Key words: Three-dimensiond conformal radiotherapy; Intensity modulated radiotherapy; Radiation induced heart disease; Transforming growth factor-β1; Human interleukin-1β