Article Publish Status: FREE
Abstract Title:

Oregano demonstrates distinct tumour-suppressive effects in the breast carcinoma model.

Abstract Source:

Eur J Nutr. 2016 Feb 23. Epub 2016 Feb 23. PMID: 26907089

Abstract Author(s):

Peter Kubatka, Martin Kello, Karol Kajo, Peter Kruzliak, Desanka Výbohová, Ján Mojžiš, Marián Adamkov, Silvia Fialová, Lucia Veizerová, Anthony Zulli, Martin Péč, Dagmar Statelová, Daniel Grančai, Dietrich Büsselberg

Article Affiliation:

Peter Kubatka


PURPOSE: There has been a considerable interest in the identification of natural plant foods for developing effective agents against cancer. Thus, the anti-tumour effects of oregano in the in vivo and in vitro breast cancer model were evaluated.

METHODS: Lyophilized oregano (ORE) was administered at two concentrations of 0.3 and 3 % through diet. The experiment was terminated 14 weeks after carcinogen administration. At autopsy, mammary tumours were removed and prepared for histopathological and immunohistochemical analysis. Moreover, in vitro evaluation in MCF-7 cells was carried out.

RESULTS: Low-dose ORE suppressed tumour frequency by 55.5 %, tumour incidence by 44 %, and tumour volume by 44.5 % compared to control animals. Analysis of rat tumour cells showed Ki67, VEGFR-2, CD24, and EpCAM expression decrease and caspase-3 expression increase after low-dose ORE treatment. High-dose ORE lengthened tumour latency by 12.5 days; moreover, Bcl-2, VEGFR-2, CD24, and EpCAM expression decrease and caspase-3 expression increase in carcinoma cells were observed. Histopathological analysis revealed a decrease in the ratio of high-/low-grade carcinomas in both treated groups. In vitro studies showed that ORE decreased survival and proliferation of MCF-7 cells. In ORE-treated MCF-7 cells, an increase in cells expressing sub-G 0/G 1 DNA content and an increase in the percentage of annexin V/PI positive MCF-7 cells were observed. In vitro, both caspase-dependent and possible non-caspase-dependent apoptotic pathways were found. The deactivation of anti-apoptotic activity of Bcl-2, a decrease in mitochondrial membrane potential, and the activation of mitochondrial apoptosis pathway were observed in the ORE-treated MCF-7 cells.

CONCLUSIONS: Our results demonstrate, for the first time, a distinct tumour-suppressive effect of oregano in the breast cancer model.

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