PubMed · 9707933
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J W Fickett. 1998. Predictive methods using nucleotide sequences.. https://doi.org/10.1002/9780470110607.ch10
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Although progress in clinical and basic research has significantly increased our understanding of breast cancer, little is known about the molecular mechanism underlying breast cancer metastasis. Identification of effective therapeutic targets to prevent breast cancer metastasis is urgently needed. The function of miR-503-3p has been investigated in other cancers, but its role in breast cancer remains undefined. Here, we found that miR-503-3p was overexpressed in breast cancer tissue and plasma compared with adjacent normal breast tissue and with plasma from healthy individuals. Moreover, we identified miR-503-3p to be an oncogene of breast cancer cell proliferation, migration and invasion. Upregulation of miR-503-3p in breast cancer cells inhibited expression of epithelial-mesenchymal transition (EMT)-related protein SMAD2 and the epithelial marker protein E-cadherin by directly binding to their mRNA 3' untranslated region, whereas increased expression of mesenchymal marker proteins, including vimentin and N-cadherin. Taken together, our findings support a critical role for miR-503-3p in induction of breast cancer EMT and suggest that plasma miR-503-3p may be a useful diagnostic biomarker for breast cancer.
Through exhaustive two-hybrid screens using a budding yeast genomic library, and starting with the splicing factor and DEAH-box RNA helicase Prp22p as bait, we identified yeast Prp45p and Prp46p. We show that as well as interacting in two-hybrid screens, Prp45p and Prp46p interact with each other in vitro. We demonstrate that Prp45p and Prp46p are spliceosome associated throughout the splicing process and both are essential for pre-mRNA splicing. Under nonsplicing conditions they also associate in coprecipitation assays with low levels of the U2, U5, and U6 snRNAs that may indicate their presence in endogenous activated spliceosomes or in a postsplicing snRNP complex.
The cell wall of the yeast Saccharomyces cerevisiae is a tough, rigid structure, which presents a significant barrier to the release of native or recombinant proteins from this biotechnologically important organism. There is hence a need to develop inexpensive and efficient methods of lysing yeast cells in order to release their intracellular contents. To develop such a method, a tightly regulated promoter, pMET3, has been used to control three genes involved in cell wall biogenesis: PDE2, SRB1/PSA1, and PKC1. Two of these regulation cassettes, pMET3-SRB1/PSA1 and pMET3-PKC1, have been integrated at the chromosomal loci of the respective genes in order to overcome problems of plasmid instability. Although repression of PDE2 did not cause cell lysis, cells depleted of Srb1p/Psa1p gradually lost their viability and integrity, releasing about 10% of total protein into the medium. Repression of PKC1 led to extensive cell lysis, accompanied by the release of 45% of cellular protein into the medium. A double mutant, carrying both pMET3-SRB1/PSA1 and pMET3-PKC1 cassettes in place of SRB1/PSA1 and PKC1, was constructed and found to permit the efficient release of both homologous and heterologous proteins. © 1999 John Wiley & Sons, Inc.,