Abstract
Purpose
Fruit and vegetable intake is inversely correlated with cancer; thus, it is proposed that an extract of phytochemicals as present in whole fruits, vegetables, or grains may have anti-carcinogenic properties. Thus, the anti-tumour effects of fruit peel polyphenols (Flavin7) in the chemoprevention of N-methyl-N-nitrosourea-induced mammary carcinogenesis in female rats were evaluated.
Methods
Lyophilized substance of Flavin7 (F7) was administered at two concentrations of 0.3 and 3 % through diet. The experiment was terminated 14 weeks after carcinogen administration, and mammary tumours were removed and prepared for histopathological and immunohistochemical analysis. In addition, using an in vitro cytotoxicity assay, apoptosis and proliferation after F7 treatment in human breast adenocarcinoma (MCF-7) cells were performed.
Results
High-dose F7 suppressed tumour frequency by 58 % (P < 0.001), tumour incidence by 24 % (P < 0.05), and lengthened latency by 8 days (P > 0.05) in comparison with the control rats, whereas lower dose of F7 was less effective. Histopathological analysis of tumours showed significant decrease in the ratio of high-/low-grade carcinomas after high-dose F7 treatment. Immunohistochemical analysis of rat carcinoma cells in vivo found a significant increase in caspase-3 expression and significant decrease in Bcl-2, Ki67, and VEGFR-2 expression in the high-dose group. Both doses demonstrated significant positive effects on plasma lipid metabolism in rats. F7 significantly decreased survival of MCF-7 cells in vitro in MTT assay by dose- and time-dependent manner compared to control. F7 prevented cell cycle progression by significant enrichment in G1 cell populations. Incubation with F7 showed significant increase in the percentage of annexin V-/PI-positive MCF-7 cells and DNA fragmentation.
Conclusions
Our results reveal a substantial tumour-suppressive effect of F7 in the breast cancer model. We propose that the effects of phytochemicals present in this fruit extract are responsible for observed potent anti-cancer activities.





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- BrdU:
-
5-Bromo-20-deoxyuridine
- FCM:
-
Flow cytometry analysis
- FLAV 0.3/FLAV 3:
-
Experimental group with dietary-administered Flavin7 in a concentration of 0.3 and 3 %
- F7:
-
Flavin7
- HG:
-
High grade
- LDL:
-
Low-density lipoprotein
- LG:
-
Low grade
- MCF-7:
-
Human adenocarcinoma cell lines, oestrogen receptor-positive
- MDA-MB-231:
-
Human breast adenocarcinoma cell line, oestrogen receptor-negative
- NMU:
-
N-methyl-N-nitrosourea
- p.o.:
-
Per os
- VEGF:
-
Vascular endothelial growth factor
- VEGFR-2:
-
Vascular endothelial growth factor receptor-2
- VLDL:
-
Very low-density lipoprotein
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Acknowledgments
This work was supported by the Scientific Grant Agency of the Ministry of Education of the Slovak Republic under the Contract No. VEGA 1/0071/13, VEGA 1/0043/12 and by the Slovak Research and Development Agency under the Contract No. APVV-0325-07. This work was supported by the Grant “Martin Biomedical Centre” (ITMS: 26220220187), “Competence center for research and development in diagnosis and therapy”, code: 26220220153, and the Grant FNUSA-ICRC (No. CZ.1.05/1.1.00/02.0123), both projects co-funded from EU sources and European Regional Development Fund. This study was also supported by the project Medicínsky univerzitný park v Košiciach (MediPark, Košice) ITMS:26220220185 supported by Operational Programme Research and Development (OP VaV-2012/2.2/08-RO) (Contract No. OPVaV/12/2013). We thank to Eva Jakubovičová for technical support.
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On behalf of all authors, the corresponding author states that there is no conflict of interest.
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Kubatka, P., Kapinová, A., Kello, M. et al. Fruit peel polyphenols demonstrate substantial anti-tumour effects in the model of breast cancer. Eur J Nutr 55, 955–965 (2016). https://doi.org/10.1007/s00394-015-0910-5
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DOI: https://doi.org/10.1007/s00394-015-0910-5


