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Morphogen-induced decline in Gialpha2 triggers F9 teratocarcinoma stem cell progression via phospholipase C and

P Gao1, C C Malbon

  • 1Department of Molecular Pharmacology, Diabetes and Metabolic Diseases Research Program, University Medical Center-HSC, State University of New York, Stony Brook, New York 11794-8651, USA.

The Journal of Biological Chemistry
|April 12, 1996
PubMed

Insights

G-protein alpha subunit Gialpha2 loss triggers stem cell differentiation. This activates key signaling pathways like protein kinase C and MAP kinase, promoting primitive endoderm formation in F9 stem cells.

Area of Science:

  • Cell Biology
  • Developmental Biology
  • Signal Transduction

Background:

  • F9 embryonic stem cells differentiate into primitive endoderm in response to morphogens.
  • The role of G-protein alpha subunits, specifically Gialpha2, in this differentiation process is not fully understood.
  • Mitogen-activated protein (MAP) kinase pathways are implicated in cellular differentiation.

Purpose of the Study:

  • To investigate the role of Gialpha2 in morphogen-induced differentiation of F9 stem cells.
  • To elucidate the signaling network connecting Gialpha2 to the MAP kinase pathway during primitive endoderm formation.

Main Methods:

  • Utilized reduction-of-function (Gialpha2-deficient) and gain-of-function (Gialpha2 Q205L mutant) F9 stem cell lines.
  • Employed selective inhibitors of protein kinase C.
  • Analyzed the activation of phospholipase C, protein kinase C, and MAP kinase.

Main Results:

  • Morphogen-induced differentiation involves a decline in Gialpha2, activating phospholipase C, protein kinase C, and MAP kinase.
  • Gialpha2-deficient cells mimicked morphogen effects, showing pathway activation and differentiation.
  • Gain-of-function mutants and protein kinase C inhibitors blocked differentiation, confirming Gialpha2's inhibitory role on the pathway.

Conclusions:

  • Gialpha2 acts as a negative regulator in the morphogen-induced differentiation pathway of F9 stem cells.
  • Loss of Gialpha2 is essential for activating downstream signaling, including protein kinase C and MAP kinase, leading to primitive endoderm formation.

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