Melanoma frequently presents a poor chemotherapy response. In this scenario, investigations for new therapies are essential. Thus, cocoa is highlighted in this area since it presents many biological properties. This study investigated the anticarcinogenic activity of cocoa in melanoma cell lines (A‐375 and B16‐F10). Melanoma and fibroblast (HFF‐1) cell lines were exposed to different concentrations of cocoa seeds (30 to 2000 ug/ml) at 24 and 72 h. Cocoa was also associated with paclitaxel IC50. We conducted viability, proliferation, and oxidative stress analyses. Our findings suggested that cocoa isolated, at almost all concentrations tested, was able to reduce viability and proliferation of B16‐F10 cells and proliferation of A‐375 cells via oxidative stress increasing. Also, cocoa caused no damage in fibroblast cells. Moreover, cocoa increased paclitaxel activity on A‐375 by reducing cell proliferation and increasing oxidative stress. Therefore, the results highlight cocoa as a potent selective adjuvant anticancer agent against melanoma. Practical applications In conclusion, more studies should be performed to deeply explore this remarkable action of cocoa as a an promising adjuvant to enhance chemotherapy.
Experimentos com animais em alguns casos se tornam menos reprodutíveis, principalmente pelas diferenças fisiológicas entre humanos e as outras espécies. Sendo assim, o presente estudo teve como objetivo produzir filmes com polímero poli(ácido láctico) (PLA), com o intuíto de verificar o crescimento celular 3D sob o mesmo, para um possível método alternativo aos ensaios in vivo. A este filme foram incorporados óleos essenciais de lavanda e de eugenol suportados em óxido de grafeno (GO). Os filmes foram obtidos por meio de eletrofiação e o GO pelo método adaptado de Hummers, pela oxidação do grafite. O material obtido foi caracterizado pelas técnicas de difração de raios X, ângulo de contato e microscopia óptica, indicando natureza amorfa dos filmes, a adição dos óleos essenciais ao filme de PLA diminuiu o seu caráter hidrofóbico e que o GO se encontra agregado as fibras. Os ensaios in vitro foram realizados com a linhagem celular HT-29 (câncer colorretal). Ensaios de MTT, óxido nítrico, PicoGreen, DCFH-DA e crescimento celular foram realizados. Os resultados mostraram aumento na proliferação celular em todos os filmes testados. Os resultados são promissores, sugerindo que o filme produzido tem capacidade de proliferação com a célula HT-29, sendo um modelo alternativo promissor, em substituição aos testes com animais.
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