Comprehensive identification of proteins binding to RNA G-quadruplex motifs in the 5' UTR of tumor-associated mRNAs.

G-quadruplex structures in the 5' UTR of mRNAs are widely considered to suppress translation without affecting transcription. The current study describes the comprehensive analysis of proteins binding to four different G-quadruplex motifs located in mRNAs of the cancer-related genes Bcl-2, NRAS, MMP16, and ARPC2. Following metabolic labeling (Stable Isotope Labeling with Amino acids in Cell culture, SILAC) of proteins in the human cell line HEK293, G-quadruplex binding proteins were enriched by pull-down assays and identified by LC-orbitrap mass spectrometry.

Effects of genomic disruption of a guanine quadruplex in the 5' UTR of the Bcl-2 mRNA in melanoma cells.

G-quadruplex structures in the 5' UTR of mRNAs have been shown to suppress translation. However, all experiments published so far made use of artificial reporter systems. Here, we investigate for the first time the biological effects of the genomic disruption of a G-quadruplex by CRISPR/Cas9.

Antiproliferative activity of lignans against the breast carcinoma cell lines MCF 7 and BT 20.

Purpose: Phytoestrogens are plant-derived, non-steroidal phytochemicals with anticarcinogenic potential. The major structural classes are the isoflavones and lignans. The aim of this study was to compare the effect of the plant-derived lignans secoisolariciresinol and matairesinol with the human lignans enterodiol and enterolactone as well as with 17β estradiol and tamoxifen on cell proliferation of breast carcinoma cell lines.