title: Multifunctional cyclic D,L-α-peptide architectures stimulate non-insulin dependent glucose uptake in skeletal muscle cells and protect them against oxidative stress.
abstract: Oxidative stress directly correlates with the early onset of vascular complications and the progression of peripheral insulin resistance in diabetes. Accordingly, exogenous antioxidants augment insulin sensitivity in type 2 diabetic patients and ameliorate its clinical signs. Herein, we explored the unique structural and functional properties of the abiotic cyclic D,L-α-peptide architecture as a new scaffold for developing multifunctional agents to catalytically decompose ROS and stimulate glucose uptake. We showed that His-rich cyclic D,L-α-peptide 1 is very stable under high H2O2 concentrations, effectively self-assembles to peptide nanotubes, and increases the uptake of glucose by increasing the translocation of GLUT1 and GLUT4. It also penetrates cells and protects them against oxidative stress induced under hyperglycemic conditions at a much lower concentration than α-lipoic acid (ALA). In vivo studies are now required to probe the mode of action and efficacy of these abiotic cyclic D,L-α-peptides as a novel class of antihyperglycemic compounds.
authors.affiliation: Department of Chemistry, Bar-Ilan University , Ramat-Gan 52900, Israel.
authors.forename: Renana
authors.initials: R
authors.lastname: Shapira
authors.forename: Safra
authors.initials: S
authors.lastname: Rudnick
authors.forename: Bareket
authors.initials: B
authors.lastname: Daniel
authors.forename: Olga
authors.initials: O
authors.lastname: Viskind
authors.forename: Vered
authors.initials: V
authors.lastname: Aisha
authors.forename: Michal
authors.initials: M
authors.lastname: Richman
authors.forename: Kamesh R
authors.initials: KR
authors.lastname: Ayasolla
authors.forename: Alex
authors.initials: A
authors.lastname: Perelman
authors.forename: Jordan H
authors.initials: JH
authors.lastname: Chill
authors.forename: Arie
authors.initials: A
authors.lastname: Gruzman
authors.forename: Shai
authors.initials: S
authors.lastname: Rahimipour
mesh_terms: D000818:Animals; D002460:Cell Line; D005947:Glucose / Q000378:metabolism*; D051272:Glucose Transporter Type 1 / Q000378:metabolism; D051275:Glucose Transporter Type 4 / Q000378:metabolism; D007328:Insulin / Q000378:metabolism*; D051379:Mice; D046529:Microscopy, Electron, Transmission; D018482:Muscle, Skeletal / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D018384:Oxidative Stress / Q000187:drug effects*; D010456:Peptides, Cyclic / Q000737:chemistry / Q000494:pharmacology*; D011487:Protein Conformation
chemical_list: D051272:Glucose Transporter Type 1; D051275:Glucose Transporter Type 4; D007328:Insulin; D010456:Peptides, Cyclic; C495678:Slc2a1 protein, mouse; C495693:Slc2a4 protein, mouse; D005947:Glucose