title: miR-10b targets Tiam1: implications for Rac activation and carcinoma migration.
abstract: Understanding the mechanisms by which specific microRNAs regulate cell migration and invasion is a timely and significant problem in cancer cell biology. miR-10b is of interest in this regard because its expression is altered in breast and other cancers. Our analysis of potential miR-10b targets identified Tiam1 (T lymphoma invasion and metastasis 1), a guanidine exchange factor for Rac. We demonstrate, using an miR-10b synthetic precursor, expression vector, and antisense oligonucleotide, that miR-10b represses Tiam1 expression in breast carcinoma cells and that it interacts with the 3'-UTR of Tiam1. Consistent with the involvement of Tiam1 in cell motility, we observed that miR-10b suppresses the ability of breast carcinoma cells to migrate and invade. Importantly, we demonstrate that miR-10b also inhibits Tiam1-mediated Rac activation. These data provide a mechanism for the regulation of Tiam1-mediated Rac activation in breast cancer cells and need to be considered in the context of other reported functions for miR-10b.
authors.affiliation: Department of Cancer Biology, University of Massachusetts Medical School, Worcester, MA 01605, USA.
authors.forename: Charlotte H
authors.initials: CH
authors.lastname: Moriarty
authors.forename: Bryan
authors.initials: B
authors.lastname: Pursell
authors.forename: Arthur M
authors.initials: AM
authors.lastname: Mercurio
mesh_terms: D020413:3' Untranslated Regions / Q000235:genetics; D001943:Breast Neoplasms / Q000235:genetics* / Q000473:pathology; D045744:Cell Line, Tumor; D002465:Cell Movement; D005260:Female; D017930:Genes, Reporter; D020662:Guanine Nucleotide Exchange Factors / Q000037:antagonists & inhibitors / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D008156:Luciferases / Q000235:genetics; D035683:MicroRNAs / Q000235:genetics* / Q000378:metabolism; D009361:Neoplasm Invasiveness; D009369:Neoplasms / Q000235:genetics; D016133:Polymerase Chain Reaction / Q000379:methods; D012334:RNA, Neoplasm / Q000235:genetics; D000075684:T-Lymphoma Invasion and Metastasis-inducing Protein 1; D020744:rac GTP-Binding Proteins / Q000378:metabolism
chemical_list: D020413:3' Untranslated Regions; D020662:Guanine Nucleotide Exchange Factors; C547183:MIRN10 microRNA, human; D035683:MicroRNAs; D012334:RNA, Neoplasm; D000075684:T-Lymphoma Invasion and Metastasis-inducing Protein 1; C087334:TIAM1 protein, human; D008156:Luciferases; D020744:rac GTP-Binding Proteins
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