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Related Experiment Video

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PACAP and PAC1 receptor in brain development and behavior.

Sanbing Shen1, Donald R Gehlert, David A Collier

  • 1Regenerative Medicine Institute, School of Medicine, National University of Ireland (NUI) Galway, Galway, Ireland.

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|November 14, 2013
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Summary

Pituitary adenylate cyclase-activating polypeptide (PACAP) and vasoactive intestinal peptide (VIP) signaling pathways are crucial in the brain. Alterations in these pathways are linked to psychiatric disorders, suggesting new therapeutic targets.

Keywords:
AutismBrain developmentKnockoutPAC1PACAPSchizophreniaStressTransgenicVIP

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Pituitary adenylate cyclase-activating polypeptide (PACAP) and vasoactive intestinal peptide (VIP) are key neuropeptides acting via PAC1, VPAC1, and VPAC2 receptors.
  • Synthetic ligands and antagonists, alongside genetically modified animal models, have been developed to study these signaling pathways.

Purpose of the Study:

  • To review the diverse roles of PACAP-PAC1-VPAC2 signaling in the central nervous system and peripheral tissues.
  • To explore the implications of PACAP and PAC1 receptor signaling in brain development, animal behavior, and human neurodevelopmental disorders.
  • To highlight the potential of VIP/PACAP signaling modulation as a novel therapeutic strategy for psychiatric illnesses.

Main Methods:

  • Neuroanatomical, electrophysiological, behavioral, and pharmacological characterization of genetically modified mice.
  • Analysis of human genetic studies linking receptor gene alterations to psychiatric conditions.
  • Utilizing transgenic mice with human transgenes on artificial chromosomes to model gain-of-function effects.

Main Results:

  • PACAP-PAC1-VPAC2 signaling plays significant roles in both peripheral tissues and the central nervous system.
  • Human genetic studies associate VPAC2 receptor duplication with schizophrenia and high PACAP-PAC1 signaling with PTSD.
  • Genetically modified animals provide insights into loss-of-function and gain-of-function mechanisms.

Conclusions:

  • PACAP and PAC1 receptor signaling are implicated in brain development and behavior, with potential links to human neurodevelopmental disorders.
  • Alterations in VIP/PACAP signaling may contribute to psychiatric illness, even without apparent neuroanatomical changes.
  • Modulating VIP/PACAP signaling presents a promising novel therapeutic avenue for psychiatric conditions.