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The lipid kinase PIP5K1C regulates pain signaling and sensitization

Brittany D Wright1, Lipin Loo2, Sarah E Street2

  • 1Division of Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; Department of Cell Biology and Physiology, UNC Neuroscience Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.

Neuron
|May 24, 2014
PubMed

Insights

Phosphatidylinositol 4-phosphate 5 kinase type 1C (PIP5K1C) generates crucial PIP2 in pain-sensing neurons. Inhibiting PIP5K1C reduces pain signaling and hypersensitivity, suggesting it as a therapeutic target for chronic pain.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pharmacology

Background:

  • Pronociceptive receptors signal through phosphatidylinositol 4,5-bisphosphate (PIP2) hydrolysis.
  • The specific lipid kinases responsible for PIP2 generation in nociceptive dorsal root ganglia (DRG) neurons remain unidentified.
  • The role of these kinases in regulating pronociceptive receptor signaling is largely unknown.

Purpose of the Study:

  • To identify the key lipid kinases generating PIP2 in DRG neurons.
  • To investigate whether these kinases regulate pronociceptive receptor signaling.
  • To explore the therapeutic potential of targeting these kinases for chronic pain management.

Main Methods:

  • Quantitative analysis of PIP5K expression in DRG neurons.
  • Utilizing Pip5k1c(+/-) mice to assess PIP2 levels and pronociceptive signaling.
  • Employing a small molecule inhibitor (UNC3230) targeting PIP5K1C.
  • Evaluating hypersensitivity in mouse models of chronic pain via thermal and mechanical stimuli.

Main Results:

  • Phosphatidylinositol 4-phosphate 5 kinase type 1C (PIP5K1C) is the predominant PIP5K in DRG neurons, generating at least 50% of PIP2.
  • Pip5k1c haploinsufficiency significantly reduced pronociceptive signaling and TRPV1 sensitization.
  • UNC3230 treatment lowered PIP2 levels and attenuated pain hypersensitivity in vivo.
  • Reduced pronociceptive signaling and hypersensitivity were observed in Pip5k1c(+/-) mice.

Conclusions:

  • PIP5K1C plays a critical role in regulating PIP2-dependent nociceptive signaling in DRG neurons.
  • PIP5K1C activity is essential for pronociceptive receptor function and the development of chronic pain hypersensitivity.
  • Targeting PIP5K1C with inhibitors like UNC3230 presents a promising therapeutic strategy for managing chronic pain.

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