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Antitumor and antiangiogenic effects of Tonantzitlolone B, an uncommon diterpene from Stillingia loranthacea

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Abstract

Natural products have played a pivotal role for the discovery of anticancer drugs. Tonantzitlolones are flexibilan-type diterpenes rare in nature; therefore, few reports have shown antiviral and cytotoxic activities. This study aimed to investigate the in vivo antitumor action of Tonantzitlolone B (TNZ-B) and its toxicity. Toxicity was evaluated in mice (acute and micronucleus assays). Antitumor activity of TNZ-B (1.5 or 3 mg/kg intraperitoneally — i.p.) was assessed in Ehrlich ascites carcinoma model. Angiogenesis and reactive oxygen species (ROS) and nitric oxide (NO) production were also investigated, in addition to toxicological effects after 7-day treatment. The LD50 (lethal dose 50%) was estimated at around 25 mg/kg (i.p.), and no genotoxicity was recorded. TNZ-B reduced the Ehrlich tumor’s volume and total viable cancer cell count (p < 0.001 for both). Additionally, TNZ-B reduced peritumoral microvessel density (p < 0.01), suggesting antiangiogenic action. Moreover, a decrease was observed on ROS (p < 0.05) and nitric oxide (p < 0.001) levels. No significant clinical findings were observed in the analysis of biochemical, hematological, and histological (liver and kidney) parameters. In conclusion, TNZ-B exerts antitumor and antiangiogenic effects by reducing ROS and NO levels and has weak in vivo dose-repeated toxicity. These data contribute to elucidate the antitumor action of TNZ-B and point the way for further studies with this natural compound as an anticancer drug.

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Funding

Pharmaceuticals and Medicines Research Institute—Federal University of Paraíba (IPeFarM/UFPB); The Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Brasil (CAPES)-Finance Code 001 and CNPq partly financed this study.

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RAA and MVS conceived and designed the experiments; RAA, TMB, VMM, TKGS, RCF, and APGM conducted experiments; RAA, LMB, and MVS analyzed data; LSB, ESV, JFT, and MSS isolated and provided the TNZ-B; AFA performed the histopathological analysis; RAA and MVS wrote the manuscript. All authors read and approved the manuscript. The authors declare that all data were generated in-house and that no paper mill was used.

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Correspondence to Marianna V. Sobral.

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Ethics approval

All experiments were carried out in accordance with the standards established by the Brazilian Society of Science in Laboratory Animal (SBCAL) and with the standards established by the National Institute of Health Guide for Care and Use of Laboratory Animals. Experimental procedures were approved by the Ethical Committee on the Use of Animals of the Federal University of Paraíba (CEUA)/UFPB (n. 112/2017).

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The authors declare no competing interests.

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de Abrantes, R.A., Batista, T.M., Mangueira, V.M. et al. Antitumor and antiangiogenic effects of Tonantzitlolone B, an uncommon diterpene from Stillingia loranthacea. Naunyn-Schmiedeberg's Arch Pharmacol 395, 267–274 (2022). https://doi.org/10.1007/s00210-021-02185-0

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