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In PC12 Cells, Expression of Neurosecretion and Neurite Outgrowth are Governed by the Transcription Repressor REST/NRSF

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Abstract

A rapid drop of the transcription repressor REST/NRSF during precursor differentiation into nerve cells is known to release the repression of hundreds of specific genes and thus to orchestrate the acquisition of the specific phenotype. REST, however, is important not only for differentiation, but also for the maintenance of key properties in mature nerve cell. The PC12 line is uniquely favorable for studying REST because, in addition to the wild-type, low REST neurosecretory cells, it includes spontaneously defective clones lacking neurosecretion, where REST is as high as in non-nerve cells. In this article, we summarize our cell biologic studies of two nerve cell-specific processes dependent on REST, neurosecretion and neurite outgrowth. We demonstrate that, in wild-type PC12 transfected with REST constructs, expression of genes encoding proteins of dense-core and synaptic-like vesicles is decreased, though, to different extents, with chromogranins being the most and the SNAREs (except SNAP25) the least affected. Concomitantly, dense core-vesicles decrease markedly in size but can still be discharged by regulated exocytosis. When, in contrast, dominant-negative constructs of REST are transfected in high-REST PC12, and the main effector enzymes of REST, histone deacetylases, are blocked, dense-core vesicles reappear and are discharged upon stimulation. In high-REST PC12, also neurite outgrowth is inhibited by down regulation of the NGF receptor. Concomitantly, however, high REST induces the expression of proteins and of an exocytic organelle, the enlargeosome, which sustain a Rac1-dependent form of neurite outgrowth, unknown until now, operative in PC12, in neuroblastoma SH-SY5Y cells, and also in neurons.

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Acknowledgments

The contribution of the other members of the laboratory, in particular, of Andrijana Klajn and Gabriella Racchetti, to this study is gratefully acknowledged. The original study as summarized here was supported by grants from the Italian Ministry of Education and Research (FIRB 2003 and PRIN 2007), IIT, and Telethon 2009 (GGP09066).

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  1. Division of Neuroscience, IIT Network, Research Unit of Molecular Neuroscience, Vita-Salute San Raffaele University and Scientific Institute San Raffaele, DIBIT, Via Olgettina 58, 20132, Milan, Italy

    Rosalba D’Alessandro & Jacopo Meldolesi

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  1. Rosalba D’Alessandro
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  2. Jacopo Meldolesi
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Correspondence to Jacopo Meldolesi.

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A commentary to this article can be found at doi:10.1007/s10571-010-9610-0.

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D’Alessandro, R., Meldolesi, J. In PC12 Cells, Expression of Neurosecretion and Neurite Outgrowth are Governed by the Transcription Repressor REST/NRSF. Cell Mol Neurobiol 30, 1295–1302 (2010). https://doi.org/10.1007/s10571-010-9602-0

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