1. Tryptophan-Containing Dual Neuroprotective Peptides: Prolyl Endopeptidase Inhibition and
- Author
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Paloma, Manzanares, Roberto, Martínez, Sandra, Garrigues, Salvador, Genovés, Daniel, Ramón, Jose F, Marcos, and Patricia, Martorell
- Subjects
Amyloid beta-Peptides ,Neuropeptides ,Serine Endopeptidases ,Tryptophan ,prolyl endopeptidase inhibition ,molecular docking ,Molecular Dynamics Simulation ,lactoferrin-derived peptides ,Article ,Animals, Genetically Modified ,Molecular Docking Simulation ,Oxidative Stress ,rationally-designed peptides ,Animals ,neurodegenerative diseases ,Amino Acid Sequence ,Endopeptidase K ,Caenorhabditis elegans ,Prolyl Oligopeptidases ,amyloid β peptide - Abstract
Neuroprotective peptides represent an attractive pharmacological strategy for the prevention or treatment of age-related diseases, for which there are currently few effective therapies. Lactoferrin (LF)-derived peptides (PKHs) and a set of six rationally-designed tryptophan (W)-containing heptapeptides (PACEIs) were characterized as prolyl endopeptidase (PEP) inhibitors, and their effect on β-amyloid peptide (Aβ) toxicity in a Caenorhabditis elegans model of Alzheimer’s disease (AD) was evaluated. Two LF-derived sequences, PKH8 and PKH11, sharing a W at the C-terminal end, and the six PACEI heptapeptides (PACEI48L to PACEI53L) exhibited significant in vitro PEP inhibition. The inhibitory peptides PKH11 and PACEI50L also alleviated Aβ-induced paralysis in the in vivo C. elegans model of AD. Partial or total loss of the inhibitory effect on PEP was achieved by the substitution of W residues in PKH11 and PACEI50L and correlated with the loss of protection against Aβ toxicity, pointing out the relevance of W on the neuroprotective activity. Further experiments suggest that C. elegans protection might not be mediated by an antioxidant mechanism but rather by inhibition of Aβ oligomerization and thus, amyloid deposition. In conclusion, novel natural and rationally-designed W-containing peptides are suitable starting leads to design effective neuroprotective agents.
- Published
- 2018