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An experimental rat model of sporadic Alzheimer's disease and rescue of cognitive impairment with a neurotrophic peptide.

Authors: Bolognin, S  Blanchard, J  Wang, X  Basurto-Islas, G  Tung, YC  Kohlbrenner, E  Grundke-Iqbal, I  Iqbal, K 
Citation: Bolognin S, etal., Acta Neuropathol. 2012 Jan;123(1):133-51. Epub 2011 Nov 15.
Pubmed: (View Article at PubMed) PMID:22083255
DOI: Full-text: DOI:10.1007/s00401-011-0908-x

Alzheimer's disease (AD) is multifactorial and, to date, no single cause of the sporadic form of this disease, which accounts for over 99% of the cases, has been established. In AD brain, protein phosphatase-2A (PP2A) activity is known to be compromised due to the cleavage and translocation of its potent endogenous inhibitor, I2PP2A, from the neuronal nucleus to the cytoplasm. Here, we show that adeno-associated virus vector-induced expression of the N-terminal I2NTF and C-terminal I2CTF halves of I2PP2A , also called SET, in brain reproduced key features of AD in Wistar rats. The I2NTF-CTF rats showed a decrease in brain PP2A activity, abnormal hyperphosphorylation and aggregation of tau, a loss of neuronal plasticity and impairment in spatial reference and working memories. To test whether early pharmacologic intervention with a neurotrophic molecule could rescue neurodegeneration and behavioral deficits, 2.5-month-old I2NTF-CTF rats and control littermates were treated for 40 days with Peptide 6, an 11-mer peptide corresponding to an active region of the ciliary neurotrophic factor. Peripheral administration of Peptide 6 rescued neurodegeneration and cognitive deficit in I2NTF-CTF animals by increasing dentate gyrus neurogenesis and mRNA level of brain derived neurotrophic factor. Moreover, Peptide 6-treated I2NTF-CTF rats showed a significant increase in dendritic and synaptic density as reflected by increased expression of synapsin I, synaptophysin and MAP2, especially in the pyramidal neurons of CA1 and CA3 of the hippocampus.


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CRRD Object Information
CRRD ID: 6483322
Created: 2012-05-16
Species: All species
Last Modified: 2012-05-16
Status: ACTIVE


RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.