Abstract
The role of the Notch signaling pathway in adipogenesis has long been controversial as the action of individual Notch receptors appears to vary with experimental conditions. In this study, we offer some explanation for the observed contradictions by comparing the role of both Notch1 and Notch3 in regulating the expression of key adipogenic regulator, PPARγ, in human adipose-derived stem/stromal cells (hADSCs) during in vitro adipogenesis. Utilizing qRT-PCR, western blot, and immunofluorescence staining, we demonstrated that Notch3 was expressed prior to the formation of lipid vesicles, while Notch1 only appeared after vesicle formation. In addition, following the induction of adipogenesis, the levels of Notch1 intracellular domain in the nucleus were significantly reduced, while the siRNA-mediated loss of Notch1 reduced transcript but not protein levels of PPARγ. The knockdown of Notch3 led to increased expression of PPARγ during early adipogenesis that was not paralleled by a decreased expression of Hes1 and Hey1, but was accompanied by a marked decrease in the protein level of β-catenin, the key functional component of the canonical Wnt/β-catenin signaling pathway. This study deepens the understanding of the Notch pathway by clarifying the distinct roles of Notch1 and Notch3 during adipogenesis. We showed that Notch3 is involved in early adipogenic differentiation, while Notch1 functions later in the process. In addition, we begin to uncover the interaction between the Notch and Wnt signaling pathways that may offer novel therapeutic targets aimed at obesity and diabetes.
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Acknowledgements
MCL designed and performed experiments, analyzed data, and contributed significantly to the writing of the manuscript. HL assisted in primer and assay condition optimization. JN supervised the experimental design, research, analysis, and writing of the manuscript. Image credit for Fig. 5 goes to Mr. Tom Futrell, School of Design, Louisiana Tech University. Thank you to Dr. Fokhrul Hossain, Dr. Deniz A. Ucar, and Dr. Lucio Miele for their expertise and advice on Notch signaling. Research reported in this publication was supported by an Institutional Development Award (IDeA) from the National Institute of General Medical Sciences of the National Institutes of Health under Grant Number P2O GM103424-18 and support from the College of Applied and Natural Sciences at Louisiana Tech University.
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Research reported in this publication was supported by an Institutional Development Award (IDeA) from the National Institute of General Medical Sciences of the National Institutes of Health under Grant Number P2O GM103424-18 and support from the College of Applied and Natural Sciences at Louisiana Tech University.
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MCL designed and performed experiments, analyzed data, and contributed significantly to the writing of the manuscript. HL assisted in primer and assay condition optimization. JN supervised the experimental design, research, analysis, and writing of the manuscript. Image credit for Fig. 5 goes to Mr. Tom Futrell, School of Design, Louisiana Tech University.
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Liu, MC., Logan, H. & Newman, J.J. Distinct roles for Notch1 and Notch3 in human adipose-derived stem/stromal cell adipogenesis. Mol Biol Rep 47, 8439–8450 (2020). https://doi.org/10.1007/s11033-020-05884-8
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DOI: https://doi.org/10.1007/s11033-020-05884-8