Sumatriptan down-regulates calcitonin gene-related peptide expression via extracellular signalregulated 1/2 and c-Jun N-terminal kinase signaling transduction pathways in rat trigeminal ganglion after organ culture
10.3760/cma.j.issn.1006-7876.2012.07.014
- VernacularTitle:舒马普坦通过细胞外信号调节激酶1/2和c-Jun氨基末端激酶信号通路下调三叉神经节内降钙素基因相关肽的表达
- Author:
Guogang LUO
;
Bobo YUAN
;
Wenjing FAN
;
Xingyun YUAN
;
Kang HUO
;
Shemin LV
;
Yongxiao CAO
;
Cangbao XU
- Publication Type:Journal Article
- Keywords:
Sumatriptan;
Calcitonin gene-related peptide;
Trigeminal ganglion;
Signaling transduction
- From:
Chinese Journal of Neurology
2012;45(7):511-515
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the effects of sumatriptan on the modulation of calcitonin generelated peptide(CGRP) expression and its involving intracellular signaling transduction mechanisms in rat trigeminal ganglion(TG) after organ culture.Methods Using organ culture in vitro model,54 isolated TGs of SD rats were randomly divided into fresh group ( n =6 ),control group ( n =6 ) and experimental group (n =42,6 TGs for each subgroup).Experimental group included seven subgroups,which were respectively pretreated with four different concentrations of sumatriptan,specific inhibitors of extracellular signalregulated kinases 1/2 (ERK1/2) pathway (U0126 and PD98059 ),and the inhibitor of c-Jun N-terminal kinase (JNK) (SP600125).After co-cultured with above intervention agents for 24 h,CGRP-immunoreactivity (CGRP-ir) positive neurons and CGRP-mRNA expression levels were quantified by immunohistoehemistry stain and real-time polymerase chain reaction,respectively.Phosphorylated ERK1/2 (pERK1/2) and JNK (pJNK) proteins levels were determined by Western-blotting method.Results The CGRP-ir ( + ) neurons expression levels were significantly increased after 24 h organ culture.However,0.10 and 0.50 mg/ml concentrations of sumatriptan remarkably decreased the CGRP-ir ( + ) neurons expression levels.The positive cell percentage,positive optic area,integrated optical density,mean optical density and CGRP-mRNA expression level in TG were significantly reduced than control groups (tPCP =8.652,26.382; tarea =6.220,13.917; tIA =5.606,15.904; tM14 =2.661,21.748; tmRNA =8.032,15.675.P ＜ 0.05 ).The CGRP-mRNA expressions were significantly down-regulated after co-incubation with concentration of 0.50 mg/ml sumatriptan for 24 h in TG of SD rat ( P ＜0.05 ).The levels of pERK1/2 and pJNK protein kinase detected by Western-blotting were significantly reduced by 0.50 mg/ml concentration of sumatriptan,the degrees of which were closed to the ERK1/2 and JNK pathway specific blockers.Conclusion It suggests that the optimal concentration of sumatriptan significantly down-regulates CGRP over-expression via intracellular ERK1/2 and JNK signaling transduction pathways in TG after organ culture.
