alexa Involvement of mature tau isoforms in the stabilization of neurites in PC12 cells.
Psychiatry

Psychiatry

Journal of Addiction Research & Therapy

Author(s): Hanemaaijer R, Ginzburg I

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Abstract Tau microtubule-associated proteins are believed to play a role in regulation of the growth of neuronal processes. In order to study the function of tau protein in vivo, we examined the inhibition of tau expression in PC12 cells by exposing the cells to tau antisense oligodeoxynucleotides. A specific retraction of neurites was observed after 3-4 days of incubation with nerve growth factor (NGF) and the antisense oligodeoxynucleotides. This is different from the previously described retraction of neurites at the initiation step following exposure to tubulin antisense oligodeoxynucleotides, indicating that tau proteins are involved at later stages of neurite outgrowth. Analysis of tau protein isoforms in NGF-induced PC12 cells showed a transition from immature to mature tau isoforms, thus relating the appearance of the latter with the stabilization step of neurite outgrowth. Use of an RNase-protection assay demonstrated a similar switch from immature to mature tau mRNA species. The transition to stable microtubules was verified by the appearance of microtubule bundles and their stability to colchicine treatment. Both phenomena occurred between 2 and 4 days of NGF induction. These results indicate that in vivo only mature tau isoforms are involved in the transition from unstable to stable neurites, which is a key step in neuronal development. This article was published in J Neurosci Res and referenced in Journal of Addiction Research & Therapy

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