Original Article
Effects of theanine on c-Jun N-terminal kinases and P38 signaling pathways in rat hippocampus after ischemia/reperfusion
Ning Wang, Zhenni Zhang, Jianrui Lyu, Rongliang Xue
Published 2017-05-15
Cite as Int J Anesth Resus, 2017, 38(5): 385-389. DOI: 10.3760/cma.j.issn.1673-4378.2017.05.001
Abstract
ObjectiveTo discuss the effects of theanine(TH) on c-Jun N-terminal kinases (JNK) and P38 signaling pathways in the hippocampus after brain ischemia/reperfusion(I/R).
MethodsOne hundred and eight adult SD rats (290-310 g) were randomly divided into 3 groups: sham operation group(SH group), I/R group, and TH+I/R group(TH group). Transient general brain ischemia was induced by four-vessel occlusion, and the rats were sacrificed at 2, 6, 12, 24, 48 h and 72 h after reperfusion. Phosphorylated c-Jun N-terminal kinases(p-JNK) and phosphorylated P38(p-P38) in hippocampal CA1 region were detected by immunohistochemistry. Survival and apoptotic neurons in hippocampal CA1 region were counted by histochemistry and TUNEL.
ResultsIn comparison with SH group, I/R group showed higher levels of p-JNK and p-P38 in hippocampal CA1 region 2-72 h after reperfusion, and the difference reached maximum at 24 h after reperfusion. Interestingly, TH injection 4 h before ischemia prevented the decrease of p-JNK and p-P38 after I/R, and maintained their levels similar to SH group. Additionally, TH also improved neuronal survival and attenuated neuronal apoptosis in hippocampal CA1 region in response to I/R.
ConclusionsTH protected hippocampal CA1 neurons against I/R-induced apoptosis by inhibiting the phosphorylation of JNK and P38, and might be a therapeutic approach for brain I/R injury.
Key words:
Brain; Ischemia/reperfusion injury; Apoptosis; Theanine; c-Jun N-terminal kinases; P38
Contributor Information
Ning Wang
Department of Anesthesiology, the Second Affiliated Hospital of Medical College, Xi'an Jiaotong University, Xi'an 710004, China
Zhenni Zhang
Department of Anesthesiology, the Second Affiliated Hospital of Medical College, Xi'an Jiaotong University, Xi'an 710004, China
Jianrui Lyu
Department of Anesthesiology, the Second Affiliated Hospital of Medical College, Xi'an Jiaotong University, Xi'an 710004, China
Rongliang Xue
Department of Anesthesiology, the Second Affiliated Hospital of Medical College, Xi'an Jiaotong University, Xi'an 710004, China