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Tau protein is involved in the apoptotic process induced by anti-microtubule agents on neuroblastoma cells

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Abstract

Paclitaxel and docetaxel are potent anti-microtubule and antimitotic agents that induce apoptosis in bone marrow-derived cells and epithelial cells. This study examined apoptosis induced by anti-microtubule agents in the neuroblastoma SK-N-SH cell line with a special focus on tau protein which is one of the main Microtubule-Associated- Proteins (MAPs) in neuronal cells. In time, treatment with 1 μM paclitaxel successively induced formation of bundles, then pseudo-asters concomitantly with mitotic block and phosphorylation of bcl-2 (48 h), then phosphorylation of tau and externalization of phosphatidylserine at the early phase of apoptosis (72 h) and finally DNA fragmentation (96 h). Similar results were obtained with 0.5 μM vinorelbine. Paclitaxel induced a lower increase in tau phosphorylation in differentiated SK-N-SH/RA+ cells which are less sensitive to apoptosis. Moreover, doxorubicin whose mechanism of action is independent of microtubules also induced immunostaining of tau at 72 h treatment. In conclusion, our results on neuroblastoma cells show that overexpression of hyperphosphorylated tau is involved in the apoptotic process induced by anti-microtubule agents and may be extended to others cytostatic drugs. Thus, tau protein may play a role in the cellular events observed in neuroblastoma cells undergoing apoptosis.

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Authors and Affiliations

  1. UPRES-A CNRS 6032, Université de la Méditerranée, Marseille, France

    S. Guise, D. Braguer, M. Remacle-Bonnet, G. Pommier & C. Briand

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  1. S. Guise
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  2. D. Braguer
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  3. M. Remacle-Bonnet
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  4. G. Pommier
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  5. C. Briand
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Guise, S., Braguer, D., Remacle-Bonnet, M. et al. Tau protein is involved in the apoptotic process induced by anti-microtubule agents on neuroblastoma cells. Apoptosis 4, 47–58 (1999). https://doi.org/10.1023/A:1009682116158

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  • DOI: https://doi.org/10.1023/A:1009682116158

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