Abstract
Alzheimer’s disease (AD) continues to be the most common cause of cognitive and motor alterations in the aging population. Accumulation of amyloid β (Aβ)-protein oligomers and the microtubule associated protein-TAU might be responsible for the neurological damage. We have previously shown that Cerebrolysin (CBL) reduces the synaptic and behavioral deficits in amyloid precursor protein (APP) transgenic (tg) mice by decreasing APP phosphorylation via modulation of glycogen synthase kinase-3β (GSK3β) and cyclin-dependent kinase-5 (CDK5) activity. These kinases also regulate TAU phosphorylation and are involved in promoting neurofibrillary pathology. In order to investigate the neuroprotective effects of CBL on TAU pathology, a new model for neurofibrillary alterations was developed using somatic gene transfer with adeno-associated virus (AAV2)-mutant (mut) TAU (P301L). The Thy1-APP tg mice (3 m/o) received bilateral injections of AAV2-mutTAU or AAV2-GFP, into the hippocampus. After 3 months, compared to non-tg controls, in APP tg mice intra-hippocampal injections with AAV2-mutTAU resulted in localized increased accumulation of phosphorylated TAU and neurodegeneration. Compared with vehicle controls, treatment with CBL in APP tg injected with AAV2-mutTAU resulted in a significant decrease in the levels of TAU phosphorylation at critical sites dependent on GSK3β and CDK5 activity. This was accompanied by amelioration of the neurodegenerative alterations in the hippocampus. This study supports the concept that the neuroprotective effects of CBL may involve the reduction of TAU phosphorylation by regulating kinase activity.
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This work was supported by NIH grant AG05131 and by a grant from EBEWE Pharmaceuticals.
Conflict of interest statement
Research relating to this manuscript was funded in part by a grant from EBEWE Pharmaceuticals; the manufacturer of CBL, and a portion of the scientific background to CBL and experimental design was provided by employees of EBEWE Pharmaceuticals.
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Fig. S1 In vitro characterization of pTAU expression in a neuronal cell lineinfected with AAV2-mutTAU
. pTAU immunoreactivity in B103 neuronal cells infected with AAV2-control (a) andAAV2-mutTAU (b). GFP immunoreactivity in B103 neuronal cells infected with AAV2- control (c) and AAV2-mutTAU (d). Western blot analysis (e). Bar = 50 M (TIFF 8132 kb)
Fig. S2 Time course of pTAU expression in APP tg mice injected with AAV2-mutTAU
.pTAU immunoreactivity at 0 (a), 7 (b), 14 (c) and 30 (d) days post injection with AAV2-mutTAU. Analysis in (e). Scale bar = 50 M (TIFF 12335 kb)
Fig. S3 A immunoreactivity in APP tg mice injected with AAV2-mutTAU
.Aβ immunoreactivity in AAV2-mutTAU injected vehicle-treated (a) and CBL-treated (b)APP tg mice. A immunoreactivity in AAV2-GFP injected vehicle-treated (c) and CBL-26 -treated (d) APP tg mice. Quantitative analysis of % area of A immunoreactive neuropilin AAV2-mutTAU and AAV2-GFP injected vehicle- or CBL-treated APP tg mice (i).Scale bar = 50 M. * Indicates significance at p<0.05 (one way ANOVA) (TIFF 14753 kb)
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Ubhi, K., Rockenstein, E., Doppler, E. et al. Neurofibrillary and neurodegenerative pathology in APP-transgenic mice injected with AAV2-mutant TAU: neuroprotective effects of Cerebrolysin. Acta Neuropathol 117, 699–712 (2009). https://doi.org/10.1007/s00401-009-0505-4
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DOI: https://doi.org/10.1007/s00401-009-0505-4