1. Suillus collinitus methanolic extract increases p53 expression and causes cell cycle arrest and apoptosis in a breast cancer cell line.
- Author
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Vaz JA, Ferreira IC, Tavares C, Almeida GM, Martins A, and Helena Vasconcelos M
- Subjects
- Biological Factors isolation & purification, Breast Neoplasms metabolism, Cell Cycle Checkpoints drug effects, Female, Gene Expression Regulation, Neoplastic drug effects, Humans, Hydroxybenzoates isolation & purification, Hydroxybenzoates pharmacology, MCF-7 Cells, Tumor Suppressor Protein p53 metabolism, Apoptosis drug effects, Basidiomycota chemistry, Biological Factors pharmacology, Breast Neoplasms genetics, Breast Neoplasms physiopathology, Tumor Suppressor Protein p53 genetics, Up-Regulation drug effects
- Abstract
In the present work, methanolic, ethanolic and boiled water extracts of Suillus collinitus were chemically characterised and submitted to an evaluation of their bioactive properties (antioxidant potential and cytotoxic activity in tumor cell lines). Phenolic acids and sugars were identified chromatographically and quantified in the methanolic and boiled water extracts, respectively. S. collinitus ethanolic extract had the highest antioxidant activity. Nevertheless, with respect to cell growth inhibition, the methanolic extract was the most potent extract, particularly in MCF-7 cells (GI(50) 25.2±0.2 μg/ml). Moreover, the GI(50) concentration of this extract induced a G1 cell cycle arrest, with a concomitant decrease in the percentage of cells in the S phase. Furthermore, it caused an increase in the percentage of apoptotic cells, from 6.0±0.2% in untreated cells, to 15.3±2.0% in cells treated with the GI(50) concentration and to 16.3±2.0% in cells treated with 2×GI(50) concentration. In addition, 48 h treatment with the GI(50) concentration caused a strong increase in the levels of p53, p21, and cleaved PARP, together with a decrease in Bcl-2 and XIAP. Results indicate that S. collinitus may be a promising source of bioactive compounds. Particularly, its methanolic extract appears to have a p53-mediated effect on the normal cell cycle distribution and apoptosis induction in a human breast tumor cell line., (Copyright © 2012 Elsevier Ltd. All rights reserved.)
- Published
- 2012
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