Abstract
Heat shock proteins (Hsp) are involved in proper folding of nascent proteins along with re-folding of misfolded proteins and degradation of proteinaceous aggregates. Among these, the heat shock protein 70 (Hsp70) plays important neuroprotective roles in several CNS proteinopathies including Alzheimer’s disease (AD). Interestingly, Hsp70 can bind and refold a wide repertoire of substrates in vitro. However, in the context of living organisms, the ability of this chaperone to interact with misfolded substrates depends on their subcellular localization. To bypass this limitation, and to specifically target extracellular deposition of amyloid-β42 (Aβ42) in vivo, we recently created a secreted version of Hsp70 (secHsp70) upon genetic engineering with signal peptides. Thus, in this chapter, we will review the protective effects of secHsp70 in a Drosophila model of AD expressing extracellular Aβ42. Special emphasis will be placed in the robust protection of secHsp70 against Aβ42 aggregation, neurodegeneration and memory impairments relative to the wild-type version of the chaperone. The successful targeting of secHsp70 against Aβ42-related phenotypes in the fly CNS suggests that this approach could be expanded to other extracellular amyloids. Therefore, we anticipate that additional chaperones engineered with different subcellular localization signals will provide new therapeutic insights for AD and related disorders.
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Abbreviations
- Aβ42:
-
Amyloid-β42
- AD:
-
Alzheimer’s disease
- ADP:
-
Adenosine diphosphate
- ALS:
-
Amyotrophic lateral sclerosis
- AMPA:
-
α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic
- APP:
-
Amyloid precursor protein
- APPL:
-
APP-like
- ATP:
-
Adenosine triphosphate
- CaMKK2:
-
Calmoduline kinase kinase 2
- CNS:
-
Central nervous system
- cytHsp70:
-
Cytosolic Hsp70
- GSK3:
-
Glycogen synthase kinase 3
- HSF1:
-
Heat shock factor 1
- Hsp:
-
Heat shock protein
- Hsp70:
-
70-kDa heat shock protein
- Htt:
-
Huntingtin
- JunK:
-
c-jun N-terminal kinase
- MB:
-
Mushroom body
- MD:
-
Middle domain
- nAchR:
-
Nicotinic acetyl choline receptor
- NBD:
-
Nucleotide binding domain
- NFT:
-
Neurofibrillary tangles
- NMDA:
-
N-methyl-D-aspartate
- SBD:
-
Substrate binding domain
- secHsp70:
-
Secreted Hsp70
- STI1:
-
Stress-inducible phophoprotein 1
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Acknowledgements
This work was supported by the National Institute of Health grant R21NS081356 to D.E.R.-L.
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Martín-Peña, A., Rincon-Limas, D.E. (2019). Engineering Chaperones for Alzheimer’s Disease: Insights from Drosophila Models. In: Asea, A., Kaur, P. (eds) Heat Shock Proteins in Neuroscience. Heat Shock Proteins, vol 20. Springer, Cham. https://doi.org/10.1007/978-3-030-24285-5_15
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DOI: https://doi.org/10.1007/978-3-030-24285-5_15
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