TY - JOUR
T1 - Abl deregulates Cdk5 kinase activity and subcellular localization in Drosophila neurodegeneration
AU - Lin, H.
AU - Lin, T. Y.
AU - Juang, J. L.
N1 - Funding Information:
Acknowledgements. The authors thank Dr Miyata Yuhei for providing BG2-c2 cells and Drs PP Hwang and IC Chang for assisting with electron microscopy; NHRI Optical Biology Core for confocal microscopy assistance. We also thank Dr Eric C Liebl for critical comments on the manuscript. This work was supported by the National Health Research Institutes.
PY - 2007/3
Y1 - 2007/3
N2 - Although Abl functions in mature neurons, work to date has not addressed Abl's role on Cdk5 in neurodegeneration. We found that β-amyloid (Aβ42) initiated Abl kinase activity and that blockade of Abl kinase rescued both Drosophila and mammalian neuronal cells from cell death. We also found activated Abl kinase to be necessary for the binding, activation, and translocalization of Cdk5 in Drosophila neuronal cells. Conversion of p35 into p25 was not observed in Aβ42-triggered Drosophila neurodegeneration, suggesting that Cdk5 activation and protein translocalization can be p25-independent. Our genetic studies also showed that abl mutations repressed Aβ42-induced Cdk5 activity and neurodegeneration in Drosophila eyes. Although Aβ42 induced conversion of p35 to p25 in mammalian cells, it did not sufficiently induce Cdk5 activation when c-Abl kinase activity was suppressed. Therefore, we propose that Abl and p35/p25 cooperate in promoting Cdk5-pY15, which deregulates Cdk5 activity and subcellular localization in Aβ42-triggered neurodegeneration.
AB - Although Abl functions in mature neurons, work to date has not addressed Abl's role on Cdk5 in neurodegeneration. We found that β-amyloid (Aβ42) initiated Abl kinase activity and that blockade of Abl kinase rescued both Drosophila and mammalian neuronal cells from cell death. We also found activated Abl kinase to be necessary for the binding, activation, and translocalization of Cdk5 in Drosophila neuronal cells. Conversion of p35 into p25 was not observed in Aβ42-triggered Drosophila neurodegeneration, suggesting that Cdk5 activation and protein translocalization can be p25-independent. Our genetic studies also showed that abl mutations repressed Aβ42-induced Cdk5 activity and neurodegeneration in Drosophila eyes. Although Aβ42 induced conversion of p35 to p25 in mammalian cells, it did not sufficiently induce Cdk5 activation when c-Abl kinase activity was suppressed. Therefore, we propose that Abl and p35/p25 cooperate in promoting Cdk5-pY15, which deregulates Cdk5 activity and subcellular localization in Aβ42-triggered neurodegeneration.
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U2 - 10.1038/sj.cdd.4402033
DO - 10.1038/sj.cdd.4402033
M3 - Article
C2 - 16932754
AN - SCOPUS:33847025578
SN - 1350-9047
VL - 14
SP - 607
EP - 615
JO - Cell Death and Differentiation
JF - Cell Death and Differentiation
IS - 3
ER -