Quantitative protein profiling of hippocampus during human aging.
Xu B1, Gao Y1, Zhan S1, Xiong F1, Qiu W2, Qian X2, Wang T2, Wang N2, Zhang D2, Yang Q2, Wang R3, Bao X3, Dou W3, Tian R3, Meng S1, Gai WP4, Huang Y5, Yan XX6, Ge W7, Ma C8.
Neurobiol Aging. 2016 Mar; 39: 46-56.
PMID: 26923401 DOI: 10.1016/j.neurobiolaging.2015.11.029Abstract
The hippocampus appears commonly affected by aging and various neurologic disorders in humans, whereas little is known about age-related change in overall protein expression in this brain structure. Using the 4-plex tandem mass tag labeling, we carried out a quantitative proteomic study of the hippocampus during normal aging using postmortem brains from Chinese subjects. Hippocampal samples from 16 subjects died of non-neurological/psychiatric diseases were divided into 4 age groups: 22-49, 50-69, 70-89, and >90. Among 4582 proteins analyzed, 35 proteins were significantly elevated, whereas 25 proteins were downregulated, along with increasing age. Several upregulated proteins, including transgelin, vimentin, myosin regulatory light polypeptide 9, and calcyphosin, were further verified by quantitative Western blot analysis of hippocampal tissues from additional normal subjects. Bioinformatic analysis showed that the upregulated and downregulated proteins were largely involved in several important protein-protein interaction networks. Proteins in the electron transport chain and synaptic vesicle fusion pathway were consistently downregulated with aging, whereas proteins associated with Alzheimer's disease showed little change. Our study demonstrates substantial protein profile changes in the human hippocampus during aging, which could be of relevance to age-related loss of hippocampal functions.
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