Phosphatidic acid potentiates Gαq stimulation of phospholipase C-β1 signaling

Irene Litosch

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Phosphatidic acid (PA) is interactive with Gαq-linked agonists to stimulate GPCR signaling via phospholipase C-β1 (PLC-β1). Phorbol 12-myristate 13-acetate (PMA) increases cellular levels of PA and phospholipase D activity (PLD). This study evaluated whether PMA can stimulate PLC-β1 activity via PA, independent of GPCR input in transfected COS 7 cells. PMA alone had little effect on PLC activity in cells co-transfected with PLC-β1 and Gαq. Activated Gαq, induced by co-transfecting muscarinic cholinergic receptor (m1R), was necessary for stimulation of PLC-β1 activity by PMA. Stimulation by PMA was dependent on the PA-regulatory motif of PLC-β1 implicating PA in this mechanism. PLD1 knockdown by antisense decreased responsiveness of PLC-β1 to both PMA and carbachol. PA alone thus has little effect on PLC-β1 activity, but PA and PLD1 synergize with activated Gαq to stimulate PLC-β1 signaling. Coordinate interaction with activated Gαq may serve as an important mechanism to fine tune response to ligands while preventing spurious initiation of PLC-β signaling by PA in cells.

Original languageEnglish (US)
Pages (from-to)603-607
Number of pages5
JournalBiochemical and biophysical research communications
Issue number3
StatePublished - Dec 18 2009


  • GPCR
  • Phosphatidic acid
  • Phospholipase C-β
  • Phospholipase D

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Cell Biology
  • Molecular Biology


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