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Toxicity and Antitumor Activity of a Thiophene–Acridine Hybrid

Postgraduate Program in Bioactive Natural and Synthetic Products, Federal University of Paraíba, 58051-970 João Pessoa, Paraíba, Brazil
Laboratory for Risk Assessment of Novel Technologies, Department of Molecular Biology, Federal University of Paraiba, Campus I, 58051-900 João Pessoa, Brazil
Drug Development and Synthesis Laboratory, Department of Pharmacy, State University of Paraíba, 58070-450 João Pessoa, PB, Brazil
Department of Morphology, Federal University of Rio Grande do Norte, 59078-970 Natal, RN, Brazil
Department of Pharmaceutical Sciences, Federal University of Paraíba, 58051-970 João Pessoa, Paraíba, Brazil
Author to whom correspondence should be addressed.
Molecules 2020, 25(1), 64;
Received: 2 December 2019 / Revised: 15 December 2019 / Accepted: 18 December 2019 / Published: 24 December 2019
The antitumor effects of thiophene and acridine compounds have been described; however, the clinical usefulness of these compounds is limited due to the risk of high toxicity and drug resistance. The strategy of molecular hybridization presents the opportunity to develop new drugs which may display better target affinity and less serious side effects. Herein, 2-((6-Chloro-2-methoxy-acridin-9-yl)amino)-5,6,7,8-tetrahydro-4H-cyclohepta[b]-thiophene-3-carbonitrile (ACS03), a hybrid thiophene–acridine compound with antileishmanial activity, was tested for toxicity and antitumor activity. The toxicity was evaluated in vitro (on HaCat and peripheral blood mononuclear cells) and in vivo (zebrafish embryos and acute toxicity in mice). Antitumor activity was also assessed in vitro in HCT-116 (human colon carcinoma cell line), K562 (chronic myeloid leukemic cell line), HL-60 (human promyelocytic leukemia cell line), HeLa (human cervical cancer cell line), and MCF-7 (breast cancer cell line) and in vivo (Ehrlich ascites carcinoma model). ACS03 exhibited selectivity toward HCT-116 cells (Half maximal inhibitory concentration, IC50 = 23.11 ± 1.03 µM). In zebrafish embryos, ACS03 induced an increase in lactate dehydrogenase, glutathione S-transferase, and acetylcholinesterase activities. The LD50 (lethal dose 50%) value in mice was estimated to be higher than 5000 mg/kg (intraperitoneally). In vivo, ACS03 (12.5 mg/kg) induced a significant reduction in tumor volume and cell viability. In vivo antitumor activity was associated with the nitric oxide cytotoxic effect. In conclusion, significant antitumor activity and weak toxicity were recorded for this hybrid compound, characterizing it as a potential anticancer compound. View Full-Text
Keywords: colorectal cancer; thiophene–acridine compound; antitumor; cytotoxicity; toxicity colorectal cancer; thiophene–acridine compound; antitumor; cytotoxicity; toxicity
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Lisboa, T.; Silva, D.; Duarte, S.; Ferreira, R.; Andrade, C.; Lopes, A.L.; Ribeiro, J.; Farias, D.; Moura, R.; Reis, M.; Medeiros, K.; Magalhães, H.; Sobral, M. Toxicity and Antitumor Activity of a Thiophene–Acridine Hybrid. Molecules 2020, 25, 64.

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