Proteomic profiling of sclerotic hippocampus revealed dysregulated packaging of vesicular neurotransmitters in temporal lobe epilepsy

• Published in: Epilepsy research Vol. 166; p. 106412
• Main Authors: Zhang, Yusheng, Liu, Yifan, Jia, Yangjie, Zhao, Yuming, Ma, Chao, Bao, Xinjie, Meng, Xianbin, Dou, Wanchen, Wang, Xia, Ge, Wei
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.10.2020
• Subjects: Hippocampus sclerosis; Proteomics; Temporal lobe epilepsy; Vesicle transmitters packaging; Temporal lobe epilepsy; Vesicle transmitters packaging; Proteomics; Hippocampus sclerosis
• ISSN: 0920-1211; 1872-6844
• DOI: 10.1016/j.eplepsyres.2020.106412

•Proteomics study on hippocampus revealed that the expression levels of 211 proteins were significantly altered in TLE patients.•Expressions of EAAT1, VGLUT1 and RAB3A were found altered and indicated dysregulated packaging of vesicular neurotransmitters in TLE with HS.•Upregulated expression of annexin family proteins might play an important role in protection against TLE with HS. Temporal lobe epilepsy (TLE) is the most common type of epilepsy. Hippocampal sclerosis is the most distinctive pathological feature of TLE; however, its role in the pathogenesis of TLE remains to be clarified. We performed global protein expression analysis of hippocampus from TLE patients and controls, aiming to reveal the molecular signaling pathways related to TLE. Proteomic and bioinformatic analyses of the hippocampus were performed on 4 TLE and 4 control samples. High-resolution liquid chromatography coupled to tandem mass spectrometry (LC–MS/MS), in combination with TMT-6plex quantification, was applied for global protein expression analysis. The proteomics results were validated by Western blot with 25 TLE and 25 control individuals and Immunohistochemistry analysis with 33 TLE and 10 control individuals. Bioinformatics analysis demonstrated differentially expressed proteins in the synaptic vesicle pathway, the prostaglandin synthesis and regulation pathway and endocannabinoids and retrograde modulation of synaptic transmission pathway. Among these, excitatory amino acid transporter 1 (EAAT1) and Vesicular glutamate transporter 1 (VGLUT1) are critical for TLE and dysregulated expression might be closely related to the uptake of extracellular glutamate and contribute to the pathophysiology of TLE. Ras-related protein Rab-3A (RAB3A) downregulation might indicate the TLE-induced compensatory deficit in glutamate release. Our study indicates that expression of some proteins involved in the packaging of vesicular neurotransmitters is altered in TLE. In addition, upregulated expression of annexin family proteins, which are also related to TLE, might play an important role in protection against TLE.