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Identification of metabolically distinct adipocyte progenitor cells in human adipose tissues

ABSTRACT: Identification of metabolically distinct adipocyte progenitor cells in human adipose tissues

PROVIDER: PRJNA529861 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8812250.fastq.gz	Fastqsanger.gz
	SRR8812260.fastq.gz	Fastqsanger.gz
	SRR8812270.fastq.gz	Fastqsanger.gz
	SRR8812251.fastq.gz	Fastqsanger.gz
	SRR8812261.fastq.gz	Fastqsanger.gz

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Identification of metabolically distinct adipocyte progenitor cells in human adipose tissues

Project description:Adipocyte progenitor cells (APCs) provide the reservoir of regenerative cells to produce new adipocytes, although their identity in humans remains elusive. Using FACS analysis, gene expression profiling and metabolic and proteomic analyses, we identified three APCs subtypes in human white adipose tissues. The APC subtypes are molecularly distinct but possess similar proliferative and adipogenic capacities. Adipocytes derived from APCs with high CD34 expression exhibit exceedingly high rates of lipid flux compared with APCs with low or no CD34 expression, while adipocytes produced from CD34- APCs display beige-like adipocyte properties and a unique endocrine profile. APCs were more abundant in gluteofemoral compared with abdominal subcutaneous and omental adipose tissues, and the distribution of APC subtypes varies between depots and in patients with type 2 diabetes. These findings provide a mechanistic explanation for the heterogeneity of human white adipose tissue and a potential basis for dysregulated adipocyte function in type 2 diabetes.

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Project description:Background: Mature adipocytes are notoriously difficult to study ex vivo and alternative cell culture systems have therefore been developed. One of the most common models are human adipose progenitor cells (hAPCs). Unfortunately, these display replicative senescence after prolonged culture conditions, which limits their use in mechanistic studies. Methods: Herein, we knocked in human telomerase reverse transcriptase (TERT) into the AAVS1 locus of CD55+ hAPCs derived from abdominal subcutaneous adipose tissue and characterized the cells before and after differentiation into adipocytes. Results: Immortalized TERT-hAPCs retained proliferative and adipogenic capacities comparable to those of early-passage wild type hAPCs for >80 passages. In line with this, our integrative transcriptomic and proteomic analyses revealed that TERT-hAPCs displayed robust adipocyte expression profiles. This was confirmed by functional analyses of lipid turnover where TERT-hAPCs exhibited pronounced responses to insulin and pro-lipolytic stimuli such as isoprenaline, dibutyrul cAMP and tumor necrosis factor alpha. In addition, TERT-hAPCs could be readily cultured in both standard 2D and 3D-cultures and proteomic analyses revealed that the spheroid culture conditions improved adipogenesis. Conclusion: Through descriptive and functional studies, we demonstrate that immortalization of human CD55+ hAPCs is feasible and results in cells with stable proliferative and adipogenic capacities over multiple passages. As these cells are cryopreservable, they provide the additional advantage over primary cells of allowing repeated studies in both 2D and 3D model systems with the same genetic background.

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