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CtBP2 downregulation during neural crest specification induces expression of Mitf and REST, resulting in melanocyte

Hongzi Liang1, Donna M Fekete, Ourania M Andrisani

  • 1Department of Basic Medical Sciences, Purdue University, 625 Harrison Street, West Lafayette, IN 47907-2026, USA.

Molecular and Cellular Biology
|January 5, 2011
PubMed

Insights

Cyclic AMP (cAMP) signaling promotes melanocyte differentiation in neural crest (NC) cells by degrading CtBP2 via PKA and HIPK2, which allows Mitf and REST expression. This pathway suppresses neuronal development.

Area of Science:

  • Developmental Biology
  • Cell Signaling
  • Molecular Genetics

Background:

  • Trunk neural crest (NC) cells are multipotent, differentiating into neurons, melanocytes, and glia.
  • Cyclic AMP (cAMP) signaling influences NC cell fate, promoting melanocyte differentiation and inhibiting neuronal lineages, with protein kinase A (PKA) activation being crucial.
  • The precise role of PKA and downstream pathways in mediating cAMP-induced melanocyte differentiation remains unclear.

Purpose of the Study:

  • To elucidate the role of cAMP-dependent protein kinase A (PKA) in mediating cAMP-induced melanocyte differentiation in neural crest (NC) cells.
  • To investigate the molecular mechanisms by which cAMP signaling regulates the expression of key transcription factors like Mitf and REST.
  • To identify novel regulators and signaling crosstalk involved in NC cell lineage specification.

Main Methods:

  • Utilized NC cell cultures and zebrafish models for experimental manipulation.
  • Performed gene knockdown studies for CtBP2, CtBP1, and HIPK2.
  • Assessed gene expression (Mitf, REST, neuronal genes) and cell differentiation markers.
  • Investigated protein degradation pathways involving PKA and proteasomes.

Main Results:

  • cAMP signaling induces transcription of Wnt-regulated genes Mitf and REST in NC cells.
  • Knockdown of C-terminal binding protein 2 (CtBP2) derepressed Mitf and REST, enhancing melanocyte differentiation.
  • cAMP/PKA signaling promotes CtBP2 degradation via HIPK2, leading to increased Mitf and REST expression and melanocyte specification.
  • REST was identified to suppress neuron-specific gene expression and the sympathoadrenal lineage.

Conclusions:

  • cAMP/PKA signaling, through HIPK2-mediated CtBP2 degradation, drives melanocyte differentiation by upregulating Mitf and REST.
  • REST plays a novel role in suppressing neuronal differentiation, thereby promoting the melanocyte fate.
  • The study reveals crosstalk between cAMP and Wnt signaling pathways in regulating NC cell lineage specification.

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