PuSH - Publikationsserver des Helmholtz Zentrums München: MicroRNA-30c promotes human adipocyte differentiation and co-represses PAI-1 and ALK2.

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Karbiener, M.* ; Neuhold, C.* ; Opriessnig, P.* ; Prokesch, A.* ; Bogner-Strauss, J.G.* ; Scheideler, M.*

MicroRNA-30c promotes human adipocyte differentiation and co-represses PAI-1 and ALK2.

RNA Biol. 8, 850-860 (2011)

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Open Access Gold möglich sobald Verlagsversion bei der ZB eingereicht worden ist.

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Obesity is characterized by excessive adipose tissue mass and associated with type 2 diabetes and cardiovascular diseases. To fight obesity and its sequels, elucidating molecular events that govern adipocyte differentiation and function is of key importance. MicroRNAs (miRNAs) are a novel class of non-coding, regulatory RNAs that have been shown to regulate crucial cellular processes, including differentiation. Several studies have already assigned miRNAs to distinct functions in murine adipocyte differentiation but only a few studies did so for humans. Here, we investigated the function of miR-30c in human adipogenesis. miR-30c expression was increased during adipogenesis of human multipotent adipose-derived stem (hMADS) cells, and miR-30c overexpression enforced adipocyte marker gene induction and triglyceride accumulation. miRNA target prediction revealed two putative direct targets of miR-30c, PAI-1 (SERPINE1) and ALK2 (ACVR1, ACTRI), both inversely regulated to miR-30c during adipogenesis and responsive to miR-30c overexpression. Luciferase reporter assays confirmed PAI-1 and ALK2 as direct miR-30c targets. Moreover, reciprocal expression between miR-30c and PAI-1 could also be demonstrated in white adipose tissue of obesity mouse models, suggesting a potential physiological role of miR-30c for PAI-1 regulation in the obese state. Validating PAI-1 and ALK-2 as miR-30c mediators in adipogenesis revealed that not single silencing of PAI-1 or ALK2, but only co-silencing of both phenocopied the pro-adipogenic miR-30c effect. Thus, miR-30c can target two, so far not interconnected genes in distinct pathways, supporting the idea that miRNAs might coordinate larger regulatory networks than previously anticipated.

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