A signaling loop of REST, TSC2 and β-catenin governs proliferation and function of PC12 neural cells

Romana Tomasoni, Sara Negrini, Stefania Fiordaliso, Andrijana Klajn, Tatiana Tkatch, Anna Mondino*, Jacopo Meldolesi, Rosalba D'Alessandro

*Corresponding author for this work

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

The RE-1-specific silencing transcription factor (REST or NRSF) is a transcription repressor that orchestrates differentiation and also operates in differentiated neurons and neurosecretory cells (neural cells). Its role in proliferation has been investigated so far only in rapidly growing tumors, with conflicting results: suppression in non-neural tumors, stimulation in medulloblastomas. Working with two clones of chromaffin-neuronal PC12 cells, which express different levels of REST, and using genetic complementation and knockdown approaches, we show that REST also promotes proliferation in differentiated neural cells. Mechanistically, this occurs by a signaling pathway involving REST, the GTPase-activating protein tuberin (TSC2) and the transcription co-factor β-catenin. In PC12 cells, raised expression of REST correlates with reduced TSC2 levels, nuclear accumulation and co-transcriptional activation of b-catenin, and increased expression of its target oncogenes Myc and Ccnd1, which might account for the proliferation advantage and the distinct morphology. Rest transcription is also increased, unveiling the existence of a self-sustaining, feed-forward REST-TSC2-β-catenin signaling loop that is also operative in another neural cell model, NT2/D1 cells. Transfection of REST, knockdown of TSC2 or forced expression of active β-catenin recapitulated the biochemical, functional and morphological properties of the high-expressing REST clone in wild-type PC12 cells. Upregulation of REST promoted proliferation and phenotypic changes, thus hindering neurosecretion. The new REST-TSC2-β-catenin signaling paradigm might have an important role in various aspects of neural cell physiology and pathology, including the regulation of proliferation and neurosecretion.

Original languageEnglish (US)
Pages (from-to)3174-3186
Number of pages13
JournalJournal of cell science
Volume124
Issue number18
DOIs
StatePublished - Sep 15 2011

Keywords

  • Gene expression
  • NT2/D1 cells
  • Neural cell differentiation
  • Neurosecretion
  • PC12 cells

ASJC Scopus subject areas

  • Cell Biology

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    Tomasoni, R., Negrini, S., Fiordaliso, S., Klajn, A., Tkatch, T., Mondino, A., Meldolesi, J., & D'Alessandro, R. (2011). A signaling loop of REST, TSC2 and β-catenin governs proliferation and function of PC12 neural cells. Journal of cell science, 124(18), 3174-3186. https://doi.org/10.1242/jcs.087551