Changes of HPA axis function in rats with attention deficit hyperactivity disorder
Objective: To observe the Levels of serum CORT, ACTH and CRH in SHR rats, the expression of GR, MR and CRH mRNA in hypothalamus and GR, MR mRNA in hippocampus of the ADHD model animal SHR rat, and to explore the HPA axis function and related factors in SHR rats. Methods: Junior SHR rats were used as ADHD model group and WKY rats as control group. The levels of CORT, ACTH and CRH in serum were detected by ELISA, and the mRNA expressions of GR, MR, CRH in hypothalamus and GR, MR in hippocampus were detected by RT-PCR. Results: The levels of serum CORT and ACTH in SHR rats were significantly lower than those in WKY rats (P<0.01), and the levels of serum CRH were significantly higher than those in WKY rats (P<0.01). GR and MR mRNA expression levels in hypothalamus and hippocampus were significantly higher than those in WKY rats (P<0.01), while CRH mRNA expression in hypothalamus was significantly lower than that in WKY rats (P<0.01). Conclusion: The HPA axis of SHR rats showed hyporesponsiveness, which may be related to CRH priming disorder and high expression of GR and MR mRNA in hypothalamus and hippocampus.
1. National Natural Science Foundation of China; 2. Yunnan Provincial Science and Technology Planning Project. Project No:1. 81760880; 2. 2017FF116-025.