title: MicroRNA and 3T3-L1 pre-adipocyte differentiation.
abstract: MicroRNAs (miRNAs) have been suggested to play important roles in cell proliferation, apoptosis, and differentiation. In this study, we examined miRNA expression profiles during 3T3-L1 pre-adipocyte differentiation. We constructed miRNA libraries from pre- and post-differentiated 3T3-L1 cells, and identified the expression of 77 previously reported miRNAs and 3 new miRNAs. Next, we investigated the expression levels of 102 miRNAs, including those identified in the libraries, during adipogenesis by Northern blot analysis. Sixty-five miRNAs were detected and the expression of 21 miRNAs was up- or down-regulated during adipogenesis. Intriguingly, changes in the miRNA expression pattern were observed at day 9, when lipid droplets were visible, but not at days 1, 2, or 5 after the induction of differentiation. Antisense inhibition of the up-regulated miRNAs did not affect 3T3-L1 pre-adipocyte differentiation. Although these miRNAs may be involved in modulating adipocyte function, mild down-modulations of the up-regulated miRNAs do not appear to affect 3T3-L1 pre-adipocyte differentiation.
authors.affiliation: Department of Epidemiology, Research Institute, National Cardiovascular Center, Suita, Osaka, Japan.
authors.forename: Kazuaki
authors.initials: K
authors.lastname: Kajimoto
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Naraba
authors.forename: Naoharu
authors.initials: N
authors.lastname: Iwai
mesh_terms: D041721:3T3-L1 Cells; D017667:Adipocytes / Q000166:cytology* / Q000378:metabolism*; D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects; D005819:Genetic Markers; D051379:Mice; D035683:MicroRNAs / Q000037:antagonists & inhibitors / Q000235:genetics* / Q000378:metabolism*; D016376:Oligonucleotides, Antisense / Q000235:genetics / Q000494:pharmacology; D015854:Up-Regulation
chemical_list: D005819:Genetic Markers; D035683:MicroRNAs; D016376:Oligonucleotides, Antisense