Journal
FRONTIERS IN AGING NEUROSCIENCE
Volume 9, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fnagi.2017.00228
Keywords
microglia; amyloid; degradation; TFEB; lysosome
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Funding
- National Natural Science Foundation of China [81072654]
- Program for Innovative Team on Key Technology of Shaanxi Province of China [2012KCT-17]
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Impaired clearance of Amyloid beta (A beta) by microglia in the brain may be associated with the senile plaque formation, a pathological hallmark relevant to Alzheimer's disease. Microglial cells in the brain are not able to efficiently degrade A beta, suggesting that microglial lysosome impairment may occur. However, the mechanism of A beta-induced impairment of microglia remains poorly understood. We observed the effects of A beta on the trafficking of nuclear transcriptional factor EB (TFEB), a master regulator of lysosome biogenesis, and the expression of a downstream osteoporosis-associated transmembrane protein 1 (OSTM1), a vital molecule involved in lysosome acidification in primary microglial cells. A beta(1-42) but not A beta(42-1) resulted in a significant release of tumor necrosis factor-alpha in primary microglia, but the total cellular TFEB was not changed. Further, A beta induced a dose-dependent reduction of the TFEB in the nucleus of primary microglial cells, coincident with the increase in the plasma, as revealed by Western blot and confocal microscopy. In addition, a dramatic decrease of OSTM1 expression was observed in the A beta-challenged microglial cells, along with the intracellular pH steady state, indicating the inadequate lysosomal acidification. These data suggest that A beta might result in a lysosomal dysfunction via inhibiting nuclear TFEB translocation in microglial cells.
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