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Inhibition of tau phosphorylating protein kinase cdk5 prevents beta-amyloid-induced neuronal death.

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By Alvarez A, Toro R, Caceres A, Maccioni RB • www.ProHealth.com • October 15, 1999


The key target of this study was the tau protein kinase II system (TPK II) involving the catalytic subunit cdk5 and the regulatory component p35. TPK II is one of the tau phosphorylating systems in neuronal cells, thus regulating its functions in the cytoskeletal dynamics and the extension of neuronal processes.

This research led to demonstration that the treatment of rat hippocampal cells in culture with fibrillary beta-amyloid (Abeta) results in a significant increase of the cdk5 enzymatic activity. Interestingly, the data also showed that the neurotoxic effect of 1-20 &mgr;M Abeta on primary cultures markedly diminished with co-incubation of hippocampal cells with the amyloid fibers plus the cdk5 inhibitor butyrolactone I. This inhibitor protected brain cells against Abeta-induced cell death in a concentration dependent fashion. Moreover, death was also prevented by a cdk5 antisense probe, but not by an oligonucleotide with a random sequence. The cdk5 antisense also reduced neuronal expression of cdk5 compared with the random oligonucleotide.

The studies indicate that cdk5 plays a major role in the molecular path leading to the neurodegenerative process triggered by the amyloid fibers in primary cultures of rat hippocampal neurons. These findings are of interest in the context of the pathogenesis of Alzheimer's disease.

Source: FEBS Lett 1999 Oct 15;459(3):421-6
PMID: 10526177, UI: 99456857

(Laboratory of Cellular and Molecular Biology, Faculty of Sciences, University of Chile and International Center for Cancer and Developmental Biology (ICC), Las Palmeras 3425, Nunoa, Santiago, Chile.)




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