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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Synthetic cyclopenta [b] indoles exhibit antineoplastic activity by targeting microtubule dynamics in acute myeloid leukemia cells

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Vicari, Hugo Passos [1] ; Lima, Keli [1] ; Gomes, Ralph da Costa [2] ; Fernandes, Daniara Cristina [3, 2] ; Lipreri da Silva, Jean Carlos [1] ; Rodrigues Junior, Manoel Trindade [2] ; Barroso de Oliveira, Aline Silva [2] ; dos Santos, Ricardo Nascimento [4] ; Andricopulo, Adriano Defini [4] ; Coelho, Fernando [2] ; Costa-Lotufo, Leticia Veras [1] ; Machado-Neto, Joao Agostinho [1]
Total Authors: 12
[1] Univ Sao Paulo, Inst Biomed Sci, Dept Pharmacol, Av Prof Lineu Prestes 1524, BR-05508900 Sao Paulo, SP - Brazil
[2] Univ Estadual Campinas, Chem Inst, Dept Organ Chem, BR-13083970 Campinas, SP - Brazil
[3] Inst Fed Educ Ciencia & Tecnol Sao Paulo, BR-15991502 Matao, SP - Brazil
[4] Univ Sao Paulo, Phys Inst Sao Carlos, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: European Journal of Pharmacology; v. 894, MAR 5 2021.
Web of Science Citations: 0

Acute promyelocytic leukemia (APL) is associated with PML-RAR alpha oncogene, which is treated using all-trans retinoic acid (ATRA)-based chemotherapy. However, chemoresistance is observed in 20-30% of treated patients and represents a clinical challenge, raising the importance of the development of new therapeutic options. In the present study, the effects of three synthetic cyclopenta{[}b]indoles on the leukemia phenotype were investigated using NB4 (ATRA-sensitive) and NB4-R2 (ATRA-resistant) cells. Among the tested synthetic cyclopenta{[}b]indoles, compound 2, which contains a heterocyclic nucleus, was the most active, presenting time-dependent cytotoxic activity in the mu M range in APL cells, without cytotoxicity for normal leukocytes, and was selected for further characterization. Compound 2 significantly decreased clonogenicity, increased apoptosis, and caused cell cycle arrest at S and G(2)/M phases in a drug concentration-dependent manner. Morphological analyses indicated aberrant mitosis and diffuse tubulin staining upon compound 2 exposure, which corroborates cell cycle findings. In the molecular scenario, compound 2 reduced STMN1 expression and activity, and induced PARP1 cleavage and H2AX and CHK2 phosphorylation, and modulated CDKN1A, PMAIP1, GADD45A, and XRCC3 expressions, indicating reduction of cell proliferation, apoptosis, and DNA damage. Moreover, in the in vivo tubulin polymerization assay, NB4 and NB4-R2 cells showed a reduction in the levels of polymerized tubulin upon compound 2 exposure, which indicates tubulin as a target of the drug. Molecular docking supports this hypothesis. Taken together, these data indicated that compound 2 exhibits antileukemic effects through disrupting the microtubule dynamics, identifying a possible novel potential antineoplastic agent for the treatment of ATRA-resistant APL. (AU)

FAPESP's process: 19/01700-2 - Functional investigation of Stathmin 1 in proliferation, differentiation and apoptosis in acute promyelocytic leukemia model
Grantee:Hugo Passos Vicari
Support type: Scholarships in Brazil - Master
FAPESP's process: 13/07600-3 - CIBFar - Center for Innovation in Biodiversity and Drug Discovery
Grantee:Glaucius Oliva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 19/23864-7 - Comprehensive analysis of genomic data for identification and validation of novel therapeutic targets involved in cellular cytoskeleton regulation in acute leukemia
Grantee:João Agostinho Machado Neto
Support type: Regular Research Grants
FAPESP's process: 15/17177-6 - Integrative approach on the sustainable prospection of marine natural products: from diversity to anticancer compounds
Grantee:Leticia Veras Costa Lotufo
Support type: BIOTA-FAPESP Program - Thematic Grants
FAPESP's process: 17/24993-0 - Investigation of Stathmin 1 and microtubule instability in phenotype of hematological neoplasms
Grantee:João Agostinho Machado Neto
Support type: Regular Research Grants