Project description:human Multipotent Adipose-Derived Stem (hMADS) cells constitute a highly interesting in vitro model to study adipocyte development in vitro. Using a chemically defined medium with several hormonal inducers, these cells can be differentiated into mature adipocytes within ~2 weeks. To gain a global view on transcripts which are induced or downregulated at various stages of adipocyte differentiation, we performed a microarray analysis with samples harvested at the stem cell stage, the terminally differentiated stage, as well as various time points in between.
Project description:The Mesoderm-specific transcript homolog protein MEST is a member of the alpha/beta hydrolase fold family that is expressed in adipose tissue, adipocytes as well as their precursor cells. To get an idea about potential functions of MEST in adipocyte development, we knocked down MEST in human Multipotent Adipose-Derived Stem (hMADS) cells, induced adipocyte differentiation by a chemically defined medium and performed gene expression profiling at the early stage of adipocyte differentiation.
Project description:Human multipotent adipose-derived stem (hMADS) cells were transfected at confluence with miR-26a or miR-C (non-targeting control microRNA). Two days later (=d0), adipocyte differentiation was induced. At d9 after start of differentiation, cells were harvested to identify mRNAs that are down- and upregulated by miR-26a versus miR-C.
Project description:Transcription profiling of human adipose derived stem cells before induction and at two time points after induction of differentiation
Project description:The Mesoderm-specific transcript homolog protein MEST is a member of the alpha/beta hydrolase fold family that is expressed in adipose tissue, adipocytes as well as their precursor cells. To get an idea about potential functions of MEST in adipocyte development, we knocked down MEST in human Multipotent Adipose-Derived Stem (hMADS) cells, induced adipocyte differentiation by a chemically defined medium and performed gene expression profiling at the early stage of adipocyte differentiation. Two-condition experiment, hMADS cells at day 3 after induction of adipocyte differentiation, comparison of cells transfected with an siRNA targeting MEST (siMEST) to cells transfected with a control siRNA (siC). Biological replicates: 3, indepently grown and harvested. On each array, one biological replicate of siMEST-transfected cells was directly compared to one biological replicate os siC-transfected cells (serving as reference sample). All hybridizations were repeated with reversed dye assignment (dye-swap) as technical replicates.
Project description:human Multipotent Adipose-Derived Stem (hMADS) cells were subjected to adipogenic differentiation in vitro and microRNA expression was analyzed during differentiation.
Project description:The human microRNA hsa-miR-29a is a member of the miR-29 family of microRNAs, which is expressed in the adipogenic lineage. To identify putative direct target mRNAs of the miR-29 family, and to get an idea about potential functions of the miR-29 family in adipocyte development, we transfected human Multipotent Adipose-Derived Stem (hMADS) cells with miR-29a mimics (leading to elevation of intracellular levels of mature miR-29a). Subsequently, gene expression profiling was performed for hMADS cells at day 0 (48 h after transfection) and at day 3, i.e. 3 days after adipocyte differentiation was induced by a chemically defined medium.
Project description:mRNA profiling of human Multipotent Adipose-Derived Stem (hMADS) cells transfected with miR-29a and subjected to adipocyte differentiation
Project description:Aims: Adipocytes are critical cornerstones of energy metabolism. While obesity-induced adipocyte dysfunction is associated with insulin resistance and systemic metabolic disturbances, adipogenesis, the formation of new adipocytes and healthy adipose tissue expansion are associated with metabolic benefits. Understanding the molecular mechanisms governing adipogenesis is of great clinical potential to efficiently restore metabolic health in obesity. Here we investigate the role of Heart and neural crest derivatives-expressed protein 2 (HAND2) in adipogenesis. Methods: Human white adipose tissue (WAT) were collected in a cross-sectional study of 318 individuals. In vitro, for mechanistic experiments we used primary adipocytes from human and mice as well as human multipotent adipose derived stem (hMADS) cells. Gene silencing was performed using siRNA or genetic inactivation in primary adipocytes from LoxP mouse models with Cre-encoding mRNA. Adipogenesis efficiency was measured by OilRedO staining, qPCR and microarray. A combinatorial RNASeq approach was used to identify gene clusters regulated by HAND2. In vivo, we created a conditional adipocyte Hand2 deletion mouse model using Cre under control of the Adipoq promoter (HAND2AdipoqCRE). Results: We found that HAND2 is an obesity-linked white adipocyte transcription factor regulated by glucocorticoids that was required but insufficient for adipocyte differentiation in vitro. In a large cohort of humans with obesity, WAT HAND2 expression was correlated to body-mass-index (BMI). The HAND2 gene was enriched in white adipocytes compared to brown, induced early in differentiation and responded to DEX, a typical glucocorticoid receptor (GR, encoded by NR3C1) agonist. Silencing of NR3C1 in hMADS or deletion of GR in a transgenic conditional mouse model results in diminished HAND2 expression, establishing that adipocyte HAND2 is regulated by GCs via GR in vitro and in vivo. Furthermore, we identified gene clusters indirectly regulated by the GR-HAND2 pathway. Interestingly, silencing of HAND2 impaired adipocyte differentiation in hMADS and primary mouse adipocytes. However, a conditional adipocyte Hand2 deletion mouse model using Cre under control of the Adipoq promoter did not mirror these effects on adipose tissue differentiation, indicating that Hand2 was required at stages prior to Adipoq expression. Conclusion: In summary, our study identifies HAND2 as a novel obesity-linked adipocyte transcription factor, highlighting new mechanisms of GR-dependent adipogenesis in human and mice.
Project description:human Multipotent Adipose-Derived Stem (hMADS) cells were subjected to adipogenic differentiation in vitro and microRNA expression was analyzed during differentiation. Total RNA was extracted at day 0 (AD0), day 3 (AD3) and day 8 (AD8) of differentiation, two biological replicates (1) and (2), and microRNA profiles were established with SOLiD sequencing.