心理应激对大鼠血清铁浓度的影响及其机制

目的了解心理应激对大鼠血清铁浓度的影响,并在此基础上探讨心理应激影响血清铁浓度的可能机制。方法将大鼠分为:正常对照组、心理应激组,心理应激组又分为应激1w、2w和应激2w后脱离应激环境1w组。给予正常饲料喂养,适应性饲养1w后开始应激实验,持续1w和2w,持续2w后脱离应激原正常饲养1w。分别以原子吸收法检测血清铁和肝、脾组织铁含量,Western blot法检测肝组织铁调素(hepcidin)表达。结果(1)大鼠心理应激1w和2w血清铁浓度与对照组比明显下降;(2)大鼠脱离应激环境1w血清铁浓度变化与正常对照组比无显著差异;(3)心理应激组大鼠肝、脾组织铁含量与正常对照组比均明显升高,同时伴有肝组织铁调素表达增高。结论心理应激引起大鼠血清铁浓度明显降低,这可能与应激使肝组织铁调素表达增高导致肝、脾铁含量增多有关。

EFFECT OF PSYCHOLOGICAL STRESS ON THE CONCENTRATION OF SERUM IRON IN RATS AND ITS MECHANISM

Objective To investigate the effect of psychological stress on serum iron concentration of SD rats and its mechanism. Method SD rats were randomly divided into four groups: control group (CG), psychological stress 1w group (PG 1w) and 2w group (PG-2w), and psychological stress 2w with 1w free group (PG 2w-1w). The animal model of stress was tested for 1w, 2w, and 2w with 1w free from stress. The iron concentration of serum, liver, spleen and the expression of liver hepcidin were detected by atomic absorption spectrometry and Western blot respectively. Result (1) Compared with control group, serum iron concentration of rats under stress decreased. (2) Free of psychological stress 1w later, serum iron concentration was not significantly changed. (3) Iron concentration of liver and spleen was increased significantly compared with control group, and the expression of liver hepcidin was also increased. Conclusion Psychological stress may cause serum iron of rats to decrease obviously, and it was restored after 1w free from psychological stress. The mechanism is supposed to be increase of iron storage in liver and spleen by hepcidin in rats under psychological stress.