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Honcharenko D, Juneja A, Roshan F, Maity J, Galán-Acosta L, Biverstål H, Hjorth E, Johansson J, Fisahn A, Nilsson L, Strömberg R. Amyloid-β Peptide Targeting Peptidomimetics for Prevention of Neurotoxicity. ACS Chem Neurosci 2019; 10:1462-1477. [PMID: 30673220 DOI: 10.1021/acschemneuro.8b00485] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
A new generation of ligands designed to interact with the α-helix/β-strand discordant region of the amyloid-β peptide (Aβ) and to counteract its oligomerization is presented. These ligands are designed to interact with and stabilize the Aβ central helix (residues 13-26) in an α-helical conformation with increased interaction by combining properties of several first-generation ligands. The new peptide-like ligands aim at extended hydrophobic and polar contacts across the central part of the Aβ, that is, "clamping" the target. Molecular dynamics (MD) simulations of the stability of the Aβ central helix in the presence of a set of second-generation ligands were performed and revealed further stabilization of the Aβ α-helical conformation, with larger number of polar and nonpolar contacts between ligand and Aβ, compared to first-generation ligands. The synthesis of selected novel Aβ-targeting ligands was performed in solution via an active ester coupling approach or on solid-phase using an Fmoc chemistry protocol. This included incorporation of aliphatic hydrocarbon moieties, a branched triamino acid with an aliphatic hydrocarbon tail, and an amino acid with a 4'- N, N-dimethylamino-1,8-naphthalimido group in the side chain. The ability of the ligands to reduce Aβ1-42 neurotoxicity was evaluated by gamma oscillation experiments in hippocampal slice preparations. The "clamping" second-generation ligands were found to be effective antineurotoxicity agents and strongly prevented the degradation of gamma oscillations by physiological concentration of monomeric Aβ1-42 at a stoichiometric ratio.
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Affiliation(s)
- Dmytro Honcharenko
- Department of Biosciences and Nutrition, Karolinska Institutet, 14183 Huddinge, Sweden
| | - Alok Juneja
- Department of Biosciences and Nutrition, Karolinska Institutet, 14183 Huddinge, Sweden
| | - Firoz Roshan
- Neuronal Oscillations Laboratory, Neurogeriatrics Division, Center for Alzheimer Research, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, 17164 Solna, Sweden
| | - Jyotirmoy Maity
- Department of Biosciences and Nutrition, Karolinska Institutet, 14183 Huddinge, Sweden
| | - Lorena Galán-Acosta
- Division for Neurogeriatrics, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, 14183 Stockholm, Sweden
| | - Henrik Biverstål
- Division for Neurogeriatrics, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, 14183 Stockholm, Sweden
- Department of Physical Organic Chemistry, Latvian Institute of Organic Synthesis, Riga LV-1006, Latvia
| | - Erik Hjorth
- Division for Neurogeriatrics, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, 14183 Stockholm, Sweden
| | - Jan Johansson
- Division for Neurogeriatrics, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, 14183 Stockholm, Sweden
| | - André Fisahn
- Neuronal Oscillations Laboratory, Neurogeriatrics Division, Center for Alzheimer Research, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, 17164 Solna, Sweden
| | - Lennart Nilsson
- Department of Biosciences and Nutrition, Karolinska Institutet, 14183 Huddinge, Sweden
| | - Roger Strömberg
- Department of Biosciences and Nutrition, Karolinska Institutet, 14183 Huddinge, Sweden
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Synthesis of fluorescent d-amino acids with 4-acetamidobiphenyl and 4-N,N-dimethylamino-1,8-naphthalimido containing side chains. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.06.059] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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