Title:Synthesis, Characterization, Antiproliferative Activity of Galloyl Derivatives
and Investigation of Cytotoxic Properties in HepG2/C3A Cells
Volume: 23
Issue: 13
Author(s): Rafael Claudino dos Santos, Raquel Oliveira Nascimento de Freitas, Mary Ann Foglio, João Ernesto de Carvalho, Ana Lucia Tasca Góes Ruiz, Lucas Roberto Pessatto, Rodrigo Juliano Oliveira*, Adrivanio Baranoski, Bruna Isabela Biazi, Mário Sérgio Mantovani, Candida Aparecida Leite Kassuya, Pedro Cruz de Oliveira Junior and Anelise Samara Nazari Formagio*
Affiliation:
- Faculty of Medicine, Federal University of Mato Grosso do Sul – UFMS, Campo Grande, Mato Grosso do
Sul State, Brazil
- Faculty of Health Science, Federal University of Grande Dourados - UFGD, Dourados, Mato Grosso do Sul State,
Brazil
- Faculty of Biological and Environmental Sciences, Federal University of Grande Dourados - UFGD,
Dourados, Mato Grosso do Sul State, Brazil
Keywords:
Galloyl, hydrazide, oxadiazole, triazole, antitumoral activity, hepatocarcinoma.
Abstract:
Background: Appropriate substituents in the galloyl group could lead to significant
biological properties.
Objectives: Novel galloyl-substituted compounds bearing 2-substituted-1, 3, 4-oxadiazol-5-yl, 5-
substituted-1,2,4-triazol-3-yl, and carboxamide groups were synthesized and evaluated for their
antiproliferative activity. Additionally, galloyl hydrazide (2) was evaluated by performing
cytotoxicity, membrane integrity, cell cycle, and apoptosis assays in HepG2/C3A cells.
Methods: General procedure was used for the synthesis of galloyl-substituted (3-9, 11) and
characterized by their spectroscopic data (1H and 13C NMR). The antiproliferative activity of all
novel galloyl derivatives was evaluated against nine human tumors and one nontumoral cell line.
Three response parameters (GI50, TGI, and LC50) were calculated. The cytotoxicity test was
performed for the resazurin assay. The membrane integrity, cell cycle, and apoptosis assays were
performed by flow cytometry.
Results: The substitution of the methoxy group of the galloyl ring system for a carboxamide group
(3, 4, 5, and 6) produced compounds with moderate antitumoral activity, particularly 6, against six
human cancer cell lines, K-562, PC-3, NCI-ADR/RES, OVCAR, 786-0 and NCI-H460, with GI50
values ≤ 9.45 μg/mL. Triazole derivatives 7 and 8 exhibited higher antitumoral activity toward
OVCAR, MCF-7 and leukemia K-562 cell lines, exhibiting GI50 values less than 10 μg/mL.
Compound 11 displayed significant activity against PC-3 (GI50 = 4.31 μg/mL), OVCAR (GI50 =
8.84 μg/mL) and K-562 (GI50 = 8.80 μg/mL) cell lines. Galloyl hydrazide (2) had cytotoxic activity
in HepG2/C3A cells (IC50 = 153.7 μg/mL). In membrane permeability, cell count, cell cycle, and
apoptosis assays, as determined using the IC50 of compound (2) in HepG2/C3A cells, increased
membrane permeability, decreased cell count, altered cell cycle, and initial apoptosis was observed
compared to the control group.
Conclusion: Thus, our results showed for the first time the synthesis, antiproliferative activity, and
cytotoxicity of galloyl-substituted compounds. Galloyl-substitution does not have a very strong
synergistic effect in the inhibition of cancer cell proliferation compared with galloyl hydrazide (2).
Compound 2 demonstrated promising activity in HepG2/C3A hepatocarcinoma cells.