Dynamic changes of Ca, Fe, Cu, Zn, Mg in radiation-injured rat brain and radioprotective effect of MgSO4
10.3760/cma.j.issn.0254-5098.2016.02.002
- VernacularTitle:大鼠放射性脑损伤模型中Ca、Fe、Cu、Zn、Mg含量的变化及MgSO4的保护作用
- Author:
Chao XU
;
Yu TU
;
Juying ZHOU
;
Xiaoting XU
;
Songbing QIN
;
Lili WANG
- Publication Type:Journal Article
- Keywords:
Radiation-induced brain injury;
Elements;
Magnesium
- From:
Chinese Journal of Radiological Medicine and Protection
2016;36(2):87-93
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the dynamic changes of the contents of brain water and Ca,Fe,Cu,Zn,Mg and microvascular damage in hippocampal tissue of radiation-injured rat brain.Methods The rats were randomly divided into control group,protective group (with intraperitoneal injection of 10％ MgSO4,400 mg/kg body weight + a single dose of 20 Gy electron beam irradiation in whole brain) and irradiation alone group (with intraperitoneal injection of normal saline,400 mg/kg body weight + a single dose of 20 Gy electron beam irradiation to the entire brain) with 18 rats assigned to each group and 3 rats sampled at each time point.Radiation-induced brain injury (RBI) was modeled by irradiating the rat' s whole brain with 5 MeV electrons.A dry-wet weight method was used to detect brain water content (BWC),and the level of microvascular damage was detected with HE staining of brain tissue slices,and the contents of Ca,Fe,Cu,Zn,Mg in hippocampus were detected with inductively coupled plasma atomic emission spectroscopy at different time points after radiation.Results BWC in the irradiated rats at 7,14 and 30 d post-irradiation was higher than that of control group (t =3.21,-2.11,2.82,P ＜0.05),andBWC in the protective group was less than that in the irradiated group (t =2.84,4.33,1.90,P ＜ 0.05).Microvascular thrombosis was induced in the radiated brain but this thrombosis was reduced by MgSO4.Thecontents of Ca and Fe in the brain tissue after 1,3,7 d of irradiation was higher than that of control group(t =11.41,6.81,14.03,17.17,6.89,9.12 and 5.43,5.66,3.60,P ＜ 0.05),and the content of Cain the protective group at various time post-irradiation was less than that in the irradiated group (t =5.35,5.28,11.02,14.26,5.68,9.10,P ＜0.05).The content of Cu (1,7,14,60 d post-irradiation) andZn (1,7,14,30,60 d post-irradiation) of the irradiated group was less than that of the control group(t =4.24,3.76,4.76,3.86 and 5.25,4.78,26.53,6.67,11.37,P ＜ 0.05),and the content of Cuin the protective group at different time points post-irradiation was less than that of the irradiated alonegroup (t =4.23,3.57,4.01,4.73,3.78,3.44,P ＜0.05),the content of Zn in the protective group(14 d post-irradiation) was higher than that of the irradiated group (t =6.21,P ＜ 0.05).The content ofMg in the irradiated group (7 d post-irradiation) was less than that of the control group (t =5.85,P ＜0.05).Conclusions The contents of Ca,Fe,Cu and Zn were imbalanced in the radiation-injured ratbrain,and the supplement of MgSO4could recover the balance of Ca,Fe,Cu and Zn content and alleviateradiation-induced brain injury.
