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Upregulation of APP, ADAM10 and ADAM17 in the Denervated Mouse Dentate Gyrus
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Upregulation of APP, ADAM10 and ADAM17 in the Denervated Mouse Dentate Gyrus
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Upregulation of APP, ADAM10 and ADAM17 in the Denervated Mouse Dentate Gyrus
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Journal Article
Upregulation of APP, ADAM10 and ADAM17 in the Denervated Mouse Dentate Gyrus
2014
Overview
The disintegrin and metalloproteinases ADAM10 and ADAM17 are regarded as the most important α-secretases involved in the physiological processing of amyloid precursor protein (APP) in brain. Since it has been suggested that processing of APP by α-secretases could be involved in the reorganization of the brain following injury, we studied mRNA expression of the two α-secretases Adam10 and Adam17, the ß-secretase Bace1, and the App-gene family (App, Aplp1, Aplp2) in the dentate gyrus of the mouse following entorhinal denervation. Using laser microdissection, tissue was harvested from the outer molecular layer and the granule cell layer of the denervated dentate gyrus. Expression levels of candidate genes were assessed using Affymetrix GeneChip Mouse Gene 1.0 ST arrays and reverse transcription-quantitative PCR, revealing an upregulation of Adam10 mRNA and Adam17 mRNA in the denervated outer molecular layer and an upregulation of Adam10 mRNA and App mRNA in the dentate granule cell layer. Immunolabeling for ADAM10 or ADAM17 in combination with markers for astro- and microglia revealed an increased labeling of ADAM10 and ADAM17 in the denervated outer molecular layer that was associated with reactive astrocytes but not with microglia. Collectively, these data show that denervation affects the expression level of APP and its two most important α-secretases. This suggests that APP-processing could be shifted towards the non-amyloidogenic pathway in denervated areas of the brain and, thus, towards the formation of neuroprotective APP cleavage products, such as APPsα.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Amyloid beta-Protein Precursor - genetics
/ Amyloid beta-Protein Precursor - metabolism
/ Amyloid Precursor Protein Secretases - genetics
/ Amyloid Precursor Protein Secretases - metabolism
/ Animals
/ Biology
/ Brain
/ Lasers
/ Male
/ Medicine
/ Membrane Proteins - genetics
/ Membrane Proteins - metabolism
/ Mice
/ Proteins
/ RNA
/ Rodents
/ Trauma
