Radiation induced a supra-additive cytotoxic effect in head and neck carcinoma cell lines when combined with plant extracts from Brazilian ... View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2015-04

AUTHORS

Silvia T Elias, Gabriel A Borges, Danilo A Amorim, Daniela F Rêgo, Luiz A Simeoni, Dâmaris Silveira, Yris Maria Fonseca-Bazzo, José E Paula, Christopher William Fagg, Ivelone M C Barros, Wenzel C Abreu, Décio S Pinto-Júnior, Pérola O Magalhães, Francisco A R Neves, Adriana Lofrano-Porto, Eliete N S Guerra

ABSTRACT

OBJECTIVES: Antineoplastic effects of molecules derived from plants have recently gained increasing attention as an additive to traditional therapies. The aim of this study was to evaluate the cytotoxic activity of plant extracts from the Brazilian Cerrado biome associated with radiotherapy in head and neck carcinoma cells (HNSCC). MATERIALS AND METHODS: Fifteen extracts derived from five Cerrado plants were tested in HNSCC cell lines (SCC-25, SCC-9, FaDu) and keratinocyte cells (HaCat). Cell cytotoxicity of extracts and association extract/radiation (2Gy/min) was assessed by MTT assay. Cisplatin (50 μg/mL) was used as a positive control. Extracts with the major cytotoxic activity were selected and their IC50 concentrations were defined. Apoptosis was assessed using flow cytometric analysis. RESULTS: Ten isolated extracts resulted in moderate cytotoxicity (>20 and ≤ 50 % of viable cells), while three extracts induced severe cytotoxic effects (≤ 20 % of viable cells). Plant extracts treatment improved radiotherapy cytotoxicity in all cell lines. Although plant extracts are not as potent as cisplatin plus radiation, in FaDu cells, seven extracts associated with irradiation showed cytotoxic activity similar or better than the association of cisplatin and radiation. Hexanic extract of Erythroxylum daphinites could induce apoptosis in oral cancer cells; however, necrosis was the prevalent kind of death in FaDu cells treated with hexanic extract of Erythroxylum suberosum. CONCLUSIONS: Pre-treatment of HNSCC cells with the extract derived from Cerrado plants followed by irradiation induced a supra-additive cytotoxic effect. CLINICAL RELEVANCE: This study highlights the potential biological relevance of the Cerrado biome when associated with traditional therapy for cancer. More... »

PAGES

637-646

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00784-014-1289-z

DOI

http://dx.doi.org/10.1007/s00784-014-1289-z

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1040594718

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/25096669


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