Avaliação do efeito do extrato aquoso de própolis sobre a viabilidade de células mononucleares do sangue periférico (PBMC) e de adenocarcinoma de mama MDA-MB-231 irradiadas com Cobalto-60

Abstract

Breast cancer is a aggressive diseasewhose, incidence and mortality hasves increased in recent years. For this reason it has raised concern about public health policies, being the target of research worldwide. Among the treatments for breast cancer is the radiation therapy, whichapplieuses ionizing radiation, however, with limitations due to is its toxic effects on normal tissues. The development of drugs of vegetal origin associated to the treatment of radiotherapy, has become very promising, since these substances modify the effects of the radiation minimizing its damages to the individual. The aim of the present study was to evaluate the in vitro effect of the propolis extract on the cell viability of MDA-MB-231 line adonocarcinoma cells and on the cell viability of human peripheral blood mononuclear cells (PBMC). The cells were irradiated with Low LET radiation (Linear Energy Transfer) according to the kinetics of predetermined doses (2 and 5 Gy) and supplemented with propolis extract at the concentrations of 0.5% and 1%, 5% and 10%. Post-irradiation collections were performed at the pre-established times of 24, 48 and 72 hours. The present study showed that ionizing radiation is accompanied by a significant decrease in cell viability parameters in peripheral blood mononuclear cells (PBMCs). While in the group of cells supplemented with propolis extract plus radiation, there was a decrease in the damage caused by these radiations. With regard to MDA-231 breast adenocarcinoma cells, there was a significant reduction in the survival level of these cells when subjected to radiation, whereas that effect was potentiated at the time the cell culture was supplemented With propolis extract. Supplementation with propolis extract in the treatment of radiotherapy offers a very measurable protection against cell damage to PBMCs. On the other hand, the propolis extract potentiates the cellular apoptosis of adenocarcinoma cells of resistant breast radio. The data obtained through this investigation can serve as a subsidy for the use of the propolis extract, potentializing the effects of radiotherapy treatment in patients with breast cancer.