Homobivalent Lamellarin-Like Schiff Bases: In Vitro Evaluation of Their Cancer Cell Cytotoxicity and Multitargeting Anti-Alzheimer's Disease Potential.

Abstract

Marine alkaloids belonging to the lamellarins family, which incorporate a 5,6-dihydro-1-phenylpyrrolo[2,1-a]isoquinoline (DHPPIQ) moiety, possess various biological activities, spanning from antiviral and antibiotic activities to cytotoxicity against tumor cells and the reversal of multidrug resistance. Expanding a series of previously reported imino adducts of DHPPIQ 2-carbaldehyde, novel aliphatic and aromatic Schiff bases were synthesized and evaluated herein for their cytotoxicity in five diverse tumor cell lines. Most of the newly synthesized compounds were found noncytotoxic in the low micromolar range (<30 μM). Based on a Multi-fingerprint Similarity Search aLgorithm (MuSSeL), mainly conceived for making protein drug target prediction, some DHPPIQ derivatives, especially bis-DHPPIQ Schiff bases linked by a phenylene bridge, were prioritized as potential hits addressing Alzheimer's disease-related target proteins, such as cholinesterases (ChEs) and monoamine oxidases (MAOs). In agreement with MuSSeL predictions, homobivalent para-phenylene DHPPIQ Schiff base 14 exhibited a noncompetitive/mixed inhibition of human acetylcholinesterase (AChE) with Ki in the low micromolar range (4.69 μM). Interestingly, besides a certain inhibition of MAO A (50% inhibition of the cell population growth (IC50) = 12 μM), the bis-DHPPIQ 14 showed a good inhibitory activity on self-induced β-amyloid (Aβ)1-40 aggregation (IC50 = 13 μM), which resulted 3.5-fold stronger than the respective mono-DHPPIQ Schiff base 9.

• Authors: Alisa A Nevskaya, Lada V Anikina, Rosa Purgatorio, Marco Catto, Orazio Nicolotti, Modesto de Candia, Leonardo Pisani, Tatiana N Borisova, Almira R Miftyakhova, Aleksey V Varlamov, Elena Yu Nevskaya, Roman S Borisov, Leonid G Voskressensky, Cosimo D Altomare
• Journal: Molecules (Basel, Switzerland) (Molecules) Vol. 26 Issue 2 (Jan 12 2021) ISSN: 1420-3049 [Electronic] Switzerland
• PMID: 33445600 (Publication Type: Journal Article)

Chemical References

• Amyloid beta-Peptides
• Cholinesterase Inhibitors
• Isoquinolines
• Monoamine Oxidase Inhibitors
• Schiff Bases
• Monoamine Oxidase
• Acetylcholinesterase
• Butyrylcholinesterase

Topics

• Acetylcholinesterase (metabolism)
• Alzheimer Disease (pathology)
• Amyloid beta-Peptides (metabolism)
• Butyrylcholinesterase (metabolism)
• Cell Death (drug effects)
• Cell Line, Tumor
• Cell Survival (drug effects)
• Cholinesterase Inhibitors (pharmacology)
• Humans
• Isoquinolines (chemistry, pharmacology)
• Kinetics
• Monoamine Oxidase (metabolism)
• Monoamine Oxidase Inhibitors (pharmacology)
• Neoplasms (pathology)
• Schiff Bases (chemistry, pharmacology)