Frédérik Oger1, Celine Gheeraert, Denis Mogilenko, Yacir Benomar, Olivier Molendi-Coste, Emmanuel Bouchaert, Sandrine Caron, David Dombrowicz, François Pattou, Hélène Duez, Jérome Eeckhoute, Bart Staels, Philippe Lefebvre. 1. European Genomic Institute for Diabetes (F.O., C.G., D.M., Y.B., O.M.-C., E.B., S.C., D.D., F.P., H.D., J.E., B.S., P.L.), Inserm Unité Mixte de Recherche Unité 1011 (F.O., C.G., D.M., Y.B., O.M.-C., E.B., S.C., D.D., H.D., J.E., B.S., P.L.), Université Lille 2 (F.O., C.G., D.M., Y.B., O.M.-C., E.B., S.C., D.D., F.P., H.D., J.E., B.S., P.L.), and Inserm Unité Mixte de Recherche Unité 859 (F.P.), F-59000 Lille, France; Institut Pasteur de Lille (F.O., C.G., D.M., Y.B., O.M.-C., E.B., S.C., D.D., H.D., J.E., B.S., P.L.), F-59019 Lille, France; and Centre Hospitalier Régional Universitaire de Lille (F.P.), F-59045, Lille, France.
Abstract
CONTEXT: Obesity is characterized by the excessive accumulation of dysfunctional white adipose tissue (WAT), leading to a strong perturbation of metabolic regulations. However, the molecular events underlying this process are not fully understood. OBJECTIVE: MicroRNAs (miRNAs) are small noncoding RNAs acting as posttranscriptional regulators of gene expression in multiple tissues and organs. However, their expression and roles in WAT cell subtypes, which include not only adipocytes but also immune, endothelial, and mesenchymal stem cells as well as preadipocytes, have not been characterized. Design/ Results: By applying differential miRNome analysis, we demonstrate that the expression of several miRNAs is dysregulated in epididymal WAT from ob/ob and high-fat diet-fed mice. Adipose tissue-specific down-regulation of miR-200a and miR-200b and the up-regulation of miR-342-3p, miR-335-5p, and miR-335-3p were observed. Importantly, a similarly altered expression of miR-200a and miR-200b was observed in obese diabetic patients. Furthermore, cell fractionation of mouse adipose tissue revealed that miRNAs are differentially expressed in adipocytes and in subpopulations from the stromal vascular fraction. Finally, integration of transcriptomic data showed that bioinformatically predicted miRNA target genes rarely showed anticorrelated expression with that of targeting miRNA, in contrast to experimentally validated target genes. CONCLUSION: Taken together, our data indicate that the dysregulated expression of miRNAs occurs in distinct cell types and is likely to affect cell-specific function(s) of obese WAT.
CONTEXT: Obesity is characterized by the excessive accumulation of dysfunctional white adipose tissue (WAT), leading to a strong perturbation of metabolic regulations. However, the molecular events underlying this process are not fully understood. OBJECTIVE: MicroRNAs (miRNAs) are small noncoding RNAs acting as posttranscriptional regulators of gene expression in multiple tissues and organs. However, their expression and roles in WAT cell subtypes, which include not only adipocytes but also immune, endothelial, and mesenchymal stem cells as well as preadipocytes, have not been characterized. Design/ Results: By applying differential miRNome analysis, we demonstrate that the expression of several miRNAs is dysregulated in epididymal WAT from ob/ob and high-fat diet-fed mice. Adipose tissue-specific down-regulation of miR-200a and miR-200b and the up-regulation of miR-342-3p, miR-335-5p, and miR-335-3p were observed. Importantly, a similarly altered expression of miR-200a and miR-200b was observed in obese diabeticpatients. Furthermore, cell fractionation of mouse adipose tissue revealed that miRNAs are differentially expressed in adipocytes and in subpopulations from the stromal vascular fraction. Finally, integration of transcriptomic data showed that bioinformatically predicted miRNA target genes rarely showed anticorrelated expression with that of targeting miRNA, in contrast to experimentally validated target genes. CONCLUSION: Taken together, our data indicate that the dysregulated expression of miRNAs occurs in distinct cell types and is likely to affect cell-specific function(s) of obese WAT.
Authors: A Z Kalea; R Hoteit; J Suvan; R C Lovering; J Palmen; J A Cooper; V K Khodiyar; Z Harrington; S E Humphries; F D'Aiuto Journal: J Dent Res Date: 2015-01-28 Impact factor: 6.116
Authors: Francisco José Ortega; María Moreno; Josep María Mercader; José María Moreno-Navarrete; Núria Fuentes-Batllevell; Mònica Sabater; Wifredo Ricart; José Manuel Fernández-Real Journal: Clin Epigenetics Date: 2015-04-24 Impact factor: 6.551