Format

Send to

Choose Destination
Biochim Biophys Acta Gen Subj. 2019 Aug 8;1863(11):129410. doi: 10.1016/j.bbagen.2019.08.003. [Epub ahead of print]

The amidated PACAP1-23 fragment is a potent reduced-size neuroprotective agent.

Author information

1
INRS - Centre Armand-Frappier, Laboratoire d'études moléculaires et pharmacologiques des peptides, 531 boul. des Prairies, Ville de Laval, QC H7V 1B7, Canada; INSERM-U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, IRIB, Université de Rouen, 76821 Mont-Saint-Aignan, France.
2
INRS - Centre Armand-Frappier, Laboratoire d'études moléculaires et pharmacologiques des peptides, 531 boul. des Prairies, Ville de Laval, QC H7V 1B7, Canada; INRS - Centre Armand-Frappier, Groupe de Recherche en Ingénierie des Peptides et en Pharmacothérapie (GRIPP), 531 boul. des Prairies, Ville de Laval, QC H7V 1B7, Canada.
3
Department of Pharmacology and Therapeutics, McGill University, Montréal, QC, Canada.
4
INSERM-U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, IRIB, Université de Rouen, 76821 Mont-Saint-Aignan, France.
5
INRS - Centre Armand-Frappier, Laboratoire d'études moléculaires et pharmacologiques des peptides, 531 boul. des Prairies, Ville de Laval, QC H7V 1B7, Canada. Electronic address: alain.fournier@iaf.inrs.ca.
6
INRS - Centre Armand-Frappier, Groupe de Recherche en Ingénierie des Peptides et en Pharmacothérapie (GRIPP), 531 boul. des Prairies, Ville de Laval, QC H7V 1B7, Canada. Electronic address: david.chatenet@iaf.inrs.ca.

Abstract

BACKGROUND:

Neurodegenerative disorders, such as Parkinson's disease (PD), are characterized by neuronal death involving, among other events, mitochondrial dysfunction and excitotoxicity. Along these lines, several attempts have been made to slow this pathology but none have been yet discovered. Based on its capacity to cross the blood-brain barrier and provide neuronal protection in vitro and in vivo, the pituitary adenylate cyclase-activating polypeptide (PACAP) represents a promising lead molecule. Pharmacological studies showed that PACAP interacts with three different G protein-coupled receptors, i.e. PAC1, VPAC1 and VPAC2. However, only PAC1 is associated with neuronal anti-apoptotic actions, whilst VPAC activation might cause adverse effects. In the context of the development of PAC1-selective agonists, PACAP(1-23) (PACAP23) appears as the shortest known PACAP bioactive fragment.

METHODS:

Hence, the capacity of this peptide to bind PACAP receptors and protect neuroblastoma cells was evaluated under conditions of mitochondrial dysfunction and glutamate excitotoxicity. In addition, its ability to activate downstream signaling events involving G proteins (Gαs and Gαq), EPAC, and calcium was also assessed.

RESULTS:

Compared to the endogenous peptide, PACAP23 showed a reduced affinity towards PAC1, although this fragment exerted potent neuroprotection. However, surprisingly, some disparities were observed for PACAP23 signaling compared to full length PACAP, suggesting that downstream signaling related to neuroprotection is distinctly regulated following subtle differences in their PAC1 interactions.

CONCLUSIONS:

Altogether, this study demonstrates the potent neuroprotective action of amidated PACAP23.

GENERAL SIGNIFICANCE:

PACAP23 represents an attractive template for development of shorter PACAP-derived neuroprotective molecules.

KEYWORDS:

Excitotoxicity; Mitochondrial dysfunction; Neurodegenerative disorder; Neuroprotection; PAC1; PACAP

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center