The sirtuins (SIRTs), a family of NAD+-dependent class III histone deacetylase, are involved in various biological processes including cell survival, division, senescence, and metabolism via activation of the stress-response pathway. Recently, inhibition of SIRTs has been considered a promising anticancer strategy, but their precise mechanisms of action are not well understood. In particular, t...

This study tries to elucidate the anti-proliferative and apoptotic effects of methanolic lichen extracts from Cladonia rangiformis and Cladonia convolute in MCF-7 human breast cancer cells. Lichen extracts (0-2 mg/ml) were added to MCF-7 cells for 24 h. Cell viability was tested using 3-(4,5-dimethylthiazol- 2-yl)-2,5 diphenyltetrazolium bromide (MTT) assay. Cell proliferation was observed usin...

PURPOSE Isocryptotanshinone (ICTS) is a natural bioactive product that is isolated from the roots of the widely used medical herb Salvia miltiorrhiza. However, few reports exist on the mechanisms underlying the therapeutic effects of ICTS. Here, we report that ICTS has anticancer activity and describe the mechanism underlying this effect. METHODS The antiproliferative effect of ICTS was deter...

The goal of this study was to establish paclitaxel resistant MCF-7 cells, as in vitro model, to identify the molecular mechanisms leading to acquired chemoresistance in breast cancer cells. Resistant cells were developed by stepwise increasing exposure to paclitaxel. Gene expression levels of Bax and Bcl-2 along with protein levels of caspase-8 and caspase-9 were evaluated in two resistant cell...

We studied the estrogenic activity and cellular effect of wild yam extract in MCF-7 human breast cancer cells. The extract increased the activity of the progesterone receptor and pS2 genes at the mRNA levels in human breast cancer MCF-7 cells, although the effects were not as prominent as those of 17beta-estradiol (E(2)). Western blot analysis showed that the level of estrogen receptor alpha pr...

BACKGROUND Nam Dia Long (NDL) is a Vietnamese traditional formula used for the treatment of some chronic diseases, including cancers, but which lacks evidence-based support. We investigated the selective cytotoxicity of NDL on some tumor cell lines and possible interactions among its ingredients leading to the overall activity. METHODS Crude aqueous extracts of NDL, its ingredients including ...

background: nigella sativa has been a nutritional flavoring factor and natural treatment for many ailments for so many years in medical science. earlier studies have been reported that thymoquinone (tq), an active compound of its seed, contains anticancer properties. previous studies have shown that tq induces apoptosis in breast cancer cells but it is unclear the role of p53 in the apoptotic p...

Breast cancer cells can develop resistance to chemotherapeutic agents. Epigenetic changes such as DNA methylation and histone modifications have been shown to play a critical role in acquisition of drug resistance bythese cells. microRNAs (miRNAs) are a class of short non-coding RNAs that are closely associated with cancer chemoresistance through regulating the genes involved in epigenetic modi...

This study aimed to investigate the effects of vascular endothelial growth factor (VEGF) secreted by MCF-7 breast cancer cells on the differentiation, maturation and function of dendritic cells (DCs). Small interfering RNAs (siRNAs) directed against the VEGF gene were designed and transfected into MCF-7 breast cancer cells at an optimal concentration (100 nmol/l) using cationic liposome transfe...