Abstract
Excessive accumulation of amyloid-β (Aβ) caused by cleavage of amyloid precursor protein (APP) is thought to be the primary cause of Alzheimer’s disease (AD). Two key enzymes ADAM10 and BACE1 are involved in the initial cleavage of APP, resulting in the onset of two pathways, the amyloidogenic pathway and the non-amyloidogenic pathway, respectively. Altering APP metabolism towards the non-amyloidogenic pathway is thought to reduce Aβ production. It has been reported that, in vivo, exogenous neurotrophic factors make APP apt to entering the non-amyloidogenic pathway. Since astrocytes secrete a battery of neurotrophic factors, we investigated the role of astrocyte-derived factors in the dynamics of Aβ generation in neural cells. Results show that C6 glioma cell-conditioned medium (GCM), obtained from cultured astrocyte-derived C6 glioma cells, inhibit Aβ1-42 production and shift APP processing towards the non-amyloidogenic pathway in APPswe-HEK293 cells. Such effect is attributed to two key APP cleavage enzymes, ADAM10 and BACE1. Two neurotrophic factors in the GCM, nerve growth factor and fibroblast growth factor 2, are responsible for the up-regulation of ADAM10 and down-regulation of BACE1, respectively. Our findings enhance our understanding of the relationship between astrocytes and Aβ generation, indicating that stimulation of astrocytic neurotrophic factors could slow AD progression.
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Abbreviations
- Aβ:
-
Amyloid β-protein
- AD:
-
Alzheimer’s disease
- ADAM10:
-
A disintegrin and metalloproteinase domain 10
- APP:
-
Amyloid precursor protein
- BACE1:
-
Beta-site amyloid precursor protein-cleaving enzyme 1
- BDNF:
-
Brain-derived neurotrophic factor
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- EGF:
-
Epidermal growth factor
- FGF2:
-
Fibroblast growth factor 2
- FGFR1:
-
Fibroblast growth factor receptor 1
- GCM:
-
Glioma cell-conditioned medium
- GDNF:
-
Glial cell line-derived neurotrophic factor
- NGF:
-
Nerve growth factor
- TrkA:
-
High affinity NGF tyrosine kinase receptor
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Acknowledgments
We are grateful to Professor Hui Fu (Wuhan University, School of Medicine, China) for critical reading of the manuscript.
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The authors declare that they have no competing interests.
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This work was supported by the National Natural Science Foundation of China (31371331).
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Xie, H., Xiao, Z. & Huang, J. C6 Glioma-Secreted NGF and FGF2 Regulate Neuronal APP Processing Through Up-Regulation of ADAM10 and Down-Regulation of BACE1, Respectively. J Mol Neurosci 59, 334–342 (2016). https://doi.org/10.1007/s12031-015-0690-7
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DOI: https://doi.org/10.1007/s12031-015-0690-7