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The Fabp4-Cre-model is insufficient to study Hoxc9 function in adipose tissue.
Biomedicines 8:184 (2020)
Developmental genes are important regulators of fat distribution and adipose tissue (AT) function. In humans, the expression of homeobox c9 (HOXC9) is significantly higher in subcutaneous compared to omental AT and correlates with body fat mass. To gain more mechanistic insights into the role of Hoxc9in AT, we generated Fabp4-Cre-mediated Hoxc9 knockout mice (ATHoxc9(-/-)). Male and female AT Hoxc9(-/-)mice were studied together with littermate controls both under chow diet (CD) and high-fat diet (HFD) conditions. Under HFD, only male ATHoxc9(-/-)mice gained less body weight and exhibited improved glucose tolerance. In both male and female mice, body weight, as well as the parameters of glucose metabolism and AT function were not significantly different between ATHoxc9(-/-) and littermate control CD fed mice. We found that crossing Hoxc9 floxed mice with Fabp4-Cre mice did not produce a biologically relevant ablation of Hoxc9in AT. However, we hypothesized that even subtle reductions of the generally low AT Hoxc9 expression may cause the leaner and metabolically healthier phenotype of male HFD-challenged AT Hoxc9(-/-)mice. Different models of in vitro adipogenesis revealed that Hoxc9 expression precedes the expression of Fabp4, suggesting that ablation of Hoxc9 expression in AT needs to be achieved by targeting earlier stages of AT development.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Developmental Genes ; Adipose Tissue ; Obesity ; Adipocytes; Site-specific Recombination; Glucose-homeostasis; Insulin-resistance; Expression; Brown; Genes; Fat; Adipocytes; Knockout; Obesity
Language
english
Publication Year
2020
HGF-reported in Year
2020
ISSN (print) / ISBN
2227-9059
e-ISSN
2227-9059
Journal
Biomedicines
Quellenangaben
Volume: 8,
Issue: 7,
Article Number: 184
Publisher
MDPI
Publishing Place
Basel, Switzerland
Reviewing status
Peer reviewed
Institute(s)
Helmholtz Institute for Metabolism, Obesity and Vascular Research (HI-MAG)
POF-Topic(s)
30201 - Metabolic Health
Research field(s)
Helmholtz Diabetes Center
PSP Element(s)
G-506500-001
WOS ID
WOS:000557172500001
Scopus ID
85088288241
PubMed ID
32610701
Erfassungsdatum
2020-07-07