Title:Aryl-isoquinoline as a Potential Scaffold for Novel Antitumor Agents
against Glioblastoma Cells
Volume: 21
Issue: 5
Author(s): Thais Batista Fernandes, Rosania Yang, Glaucio Monteiro Ferreira, Priscila Oliveira de Souza, Vitor Galvão Lopes, Mônica Franco Zannini Junqueira Toledo, Gabriela Gonçalves Roliano, Gabriela Nogueira Debom, Sandra Valeria Vassiliades, Neuza Mariko Aymoto Hassimotto, Mario Hiroyuki Hirata, Elizandra Braganhol and Roberto Parise-Filho*
Affiliation:
- Departamento de Farmácia, Universidade de São Paulo, São Paulo, Brazil
Keywords:
Glioma, tumor brain, Bcl-xL, sanguinarine, aryl-isoquinoline, molecular simplification, cytotoxicity, molecular dynamics.
Abstract:
Background: Glioblastoma is one of the most aggressive types of tumors, which occurs in the
central nervous system, and has a high fatality rate. Among the cellular changes observed in glioblastoma
is the overexpression of certain anti-apoptotic proteins, such as Bcl-xL. Recently, the alkaloid sanguinarine
(SAN) was identified as a potent inhibitor of this class of proteins.
Objective: In this work, the antitumor activity of ten aryl-isoquinolines that were synthesized based on
molecular simplification of SAN was investigated.
Methods: The SAN derivatives were prepared by Suzuki reaction and bimolecular nucleophilic substitution.
The compounds were tested against glioblastoma (U87MG) and melanoma (A375) tumor lines in the
MTT and SRB assay. The cell death mechanism was evaluated by flow cytometry. The molecular modeling
study was used to evaluate the interactions between the prepared compounds and the Bcl-xL protein.
Results: Analogues presented IC50 values against glioblastoma lower than temozolomide. Evaluation
against astrocytes and fibroblasts indicated that the analogues were significantly superior to SAN regarding
selectivity. The most active compound, 2e, induced phosphatidylserine externalization and mitochondrial
membrane depolarization, indicating apoptotic death by the intrinsic pathway. In addition, 2e provides
cell cycle arrest at the G2/M phase. Molecular dynamics suggested that 2e interacts with Bcl-xL
mainly by hydrophobic interactions.
Conclusion: In our study, aryl-isoquinoline represents a relevant scaffold to be explored by medicinal
chemists to develop potential anti-glioblastoma agents.