Document Detail

Molecular properties of lysine dendrimers and their interactions with Aβ-peptides and neuronal cells.
MedLine Citation:
PMID:  23033946     Owner:  NLM     Status:  MEDLINE    
Prevention of amyloidosis by chemical compounds is a potential therapeutic strategy in Alzheimer's, prion and other neurodegenerative diseases. Regularly branched dendrimers and less regular hyperbranched polymers have been suggested as promising inhibitors of amyloid aggregation. As demonstrated in our previous studies, some widely used dendrimers (PAMAM, PPI) could not only inhibit amyloid aggregation in solution but also dissolve mature fibrils. In this study we have performed computer simulation of polylysine dendrimers of 3rd and 5th generations (D3 and D5) and analysed the effect of these dendrimers and some hyperbranched polymers on a lysine base (HpbK) on aggregation of amyloid peptide in solution. The effects of dendrimers on cell viability and their protective action against Aβ-induced cytotoxicity and alteration of K+channels was also analysed using human neuroblastoma SH-SY5Y cells. In addition, using fluorescence microscopy, we analysed uptake of FITC-conjugated D3 by SH-SY5Y cells and its distribution in the brain after intraventricular injections to rats. Our results demonstrated that dendrimers D3 and D5 inhibited amyloid aggregation in solution while HpbK enhanced amyloid aggregation. Cell viability and patch-clamp studies have shown that D3 can protect cells against Aβ-induced cytotoxicity and K+channel modulation. In contrast, HpbK had no protective effect against Aβ. Fluorescence microscopy studies demonstrated that FITC-D3 accumulates in the vacuolar compartments of the cells and can be detected in various brain structures and populations of cells after injections to the brain. As such, polylysine dendrimers D3 and D5 can be proposed as compounds for developing antiamyloidogenic drugs.
I M Neelov; A Janaszewska; B Klajnert; M Bryszewska; N Z Makova; D Hicks; H A Pearson; G P Vlasov; M Yu Ilyash; D S Vasilev; N M Dubrovskaya; N L Tumanova; I A Zhuravin; A J Turner; N N Nalivaeva
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Current medicinal chemistry     Volume:  20     ISSN:  1875-533X     ISO Abbreviation:  Curr. Med. Chem.     Publication Date:  2013  
Date Detail:
Created Date:  2013-01-17     Completed Date:  2013-05-06     Revised Date:  2014-02-20    
Medline Journal Info:
Nlm Unique ID:  9440157     Medline TA:  Curr Med Chem     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  134-43     Citation Subset:  IM    
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MeSH Terms
Alzheimer Disease / drug therapy,  metabolism
Amyloid beta-Peptides / metabolism*,  toxicity
Brain / metabolism
Cell Line
Cell Survival / drug effects
Dendrimers / chemistry*,  pharmacokinetics,  pharmacology*
Models, Molecular
Neurons / cytology,  drug effects*,  pathology
Patch-Clamp Techniques
Polylysine / chemistry*,  pharmacokinetics,  pharmacology*
Grant Support
G0600936//Medical Research Council; //Biotechnology and Biological Sciences Research Council; //Medical Research Council
Reg. No./Substance:
0/Amyloid beta-Peptides; 0/Dendrimers; 25104-18-1/Polylysine

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