逍遥抗癌解郁方对乳腺癌并发抑郁症小鼠海马CRHR1、GR、BDNF mRNA表达的影响

Effects of Xiaoyao Kangai Jieyu Decoction on Expression of CRHR1,GR,BDNF mRNA in Hippocampus of Mice with Breast Cancer Complicated with Depression

目的研究复方中药逍遥抗癌解郁方对乳腺癌并发抑郁症(breast cancer related depression,BCRD)小鼠海马促肾上腺皮质激素释放激素受体1(corticotropin releasing hormone receptor 1,CRHR1)、糖皮质激素受体(glucocorticoid receptor,GR)、脑源性神经营养因子(brain-derived neurotrophic factor,BDNF)mRNA的调控作用,阐明其对海马组织的可能保护机制。方法通过腋下注射4T1炎性乳腺癌细胞联合背部皮下注射皮质酮建立BCRD小鼠模型并随机分为模型组、紫杉醇组、紫杉醇+氟西汀组、逍遥抗癌解郁方组、紫杉醇+逍遥抗癌解郁方组,同时设正常组。采用悬尾实验和强迫游泳实验检测小鼠抑郁样行为,HE染色观察小鼠海马的病理结构变化,实时荧光定量PCR检测CRHR1、GR、BDNF mRNA的表达。结果与正常组相比,模型组小鼠悬尾实验、强迫游泳实验中不动时间显著增加(P<0.01),海马结构损伤明显,GR、BDNF mRNA表达显著下降(P<0.01),CRHR1 mRNA表达显著上升(P<0.01);给予逍遥抗癌解郁方干预后,模型小鼠悬尾实验、强迫游泳实验中不动时间下降(P<0.05),海马结构损伤得以恢复,GR、BDNF mRNA表达显著上升(P<0.01)、CRHR1 mRNA表达显著下降(P<0.01)。结论逍遥抗癌解郁方可以改善BCRD小鼠的抑郁症状,保护海马组织,其作用机制与上调GR、BDNF和下调CRHR1的mRNA表达有关。

Objective To study the effects of Xiaoyao Kangai Jieyu Decoction on corticotropin releasing hormone receptor 1(CRHR1),glucocorticoid receptor(GR),brain-derived neurotrophic factor(BDNF)and regulation of mRNA in Hippocampus of breast cancer related depression(BCRD)mice,to elucidate its possible protective mechanism on hippocampus.Methods The BCRD mice model was established by subaxillary injection of 4T1 inflammatory breast cancer cells combined with subcutaneous injection of corticosterone on the back,and the mice were randomly divided into a model group,a paclitaxel group,a paclitaxel+fluoxetine group,a Xiaoyao Kangai Jieyu Decoction group,a paclitaxel+Xiaoyao Kangai Jieyu Decoction and a normal group.The depression-like behavior of mice was detected by tail suspension test and forced swimming test.The pathological changes of hippocampus were observed by HE staining.The mRNA expressions of CRHR1,GR and BDNF were detected by real-time fluorescent quantitative PCR.Results Compared with the normal group,the immobility time in the tail suspension test and forced swimming test in the model group was significantly increased(P<0.01),and the hippocampal structural damage was obvious.The mRNA expressions of GR,BDNF were significantly decreased(P<0.01).The mRNA expression of CRHR1 increased significantly(P<0.01).After the intervention of Xiaoyao Kangai Jieyu Decoction,the immobility time in tail suspension test and forced swimming test in the model mice were decreased significantly(P<0.05),the mRNA expression of GR,BDNF was increased significantly(P<0.01),and the mRNA expression of CRHR1 was decreased significantly(P<0.01).Conclusion Xiaoyao Kangai Jieyu Decoction can improve the depressive symptoms of BCRD mice and protect hippocampus,and the mechanism of action is related to up-regulation of GR,BDNF and down-regulation of mRNA expression of CRHRI.