VPAC receptors for VIP and PACAP

Area of Science:

• Neuroscience
• Pharmacology
• Molecular Biology

Background:

• Vasoactive intestinal peptide (VIP) and pituitary adenylyl cyclase-activating polypeptide (PACAP) are key neuropeptides.
• These peptides signal through G protein-coupled receptors (GPCRs), primarily VPAC1 and VPAC2, with PACAP also utilizing the PAC1 receptor.

Purpose of the Study:

• To provide a comprehensive review of the current knowledge on VPAC receptors.
• To detail receptor specificity, pharmacology, genomic aspects, signaling pathways, ligand-receptor interactions, and regulatory mechanisms.

Main Methods:

• Literature review of existing research on VPAC receptors.
• Analysis of studies employing site-directed mutagenesis, receptor chimeras, and structural modeling.
• Examination of data from transgenic models and polymorphism studies.

Main Results:

• VPAC receptors exhibit distinct specificities for VIP and PACAP-related peptides.
• Detailed understanding of receptor genomic organization, chromosomal localization, and signaling interactions with G proteins and accessory proteins (RAMPs, PDZ proteins).
• Insights into the molecular basis of ligand-receptor binding and receptor regulation, including desensitization, internalization, and transcriptional changes.

Conclusions:

• VPAC receptors are crucial mediators of VIP and PACAP actions with complex regulatory networks.
• Further research into receptor polymorphisms and their functional consequences is warranted.
• This review consolidates current understanding, highlighting areas for future investigation in neuropeptide signaling.