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Updated: Aug 11, 2026
Differentiation and Imaging of Brown Adipocytes from the Stromal Vascular Fraction of Interscapular Adipose Tissue from Newborn Mice
Published on: February 3, 2023
PKBalpha is required for adipose differentiation of mouse embryonic fibroblasts
Anne Baudry1, Zhong-Zhou Yang, Brian A Hemmings
1Friedrich Miescher Institute for Biomedical Research, Maulbeerstr. 66, CH-4058, Basel, Switzerland.
Abstract:
Protein kinase Balpha (PKBalpha) is a key regulator of metabolism, proliferation and differentiation. We have explored the role of PKBalpha in adipogenesis using wild-type and PKBalpha-knockout mouse embryonic fibroblasts (MEFs) and show that lack of PKBalpha prevents MEF differentiation into adipocytes. Expression of ectopic PKBalpha in PKBalpha-deficient cells restores adipogenesis. We identified 80 genes whose expression was upregulated in wild-type MEFs during adipogenesis but whose expression was significantly reduced in PKBalpha-deficient MEFs under the same conditions. Significantly, the regulator of adipogenesis Krüppel-like transcription factor 15 gene expression was downregulated in PKBalpha-deficient MEFs but could be restored by expressing an active PKBalpha in the deficient cells. The level of lipocalin 2, renin 1 and receptor-activity-modifying protein 3 genes expressed by adipose cells was also decreased in PKBalpha-deficient MEFs, and are inhibited by LY294002 treatment during early adipocyte differentiation of 3T3-L1 cells. The results underscore an essential role for PKBalpha in the transcriptional program required for adipogenesis.
Insights
Protein kinase Balpha (PKBalpha) is crucial for adipogenesis, the process of fat cell formation. Its absence blocks differentiation, but restoring PKBalpha enables fat cell development and gene expression.
Area of Science:
- Cell biology
- Molecular biology
- Biochemistry
Background:
- Protein kinase Balpha (PKBalpha) is a critical regulator of cellular processes including metabolism, proliferation, and differentiation.
- Adipogenesis, the process of fat cell differentiation, is essential for energy homeostasis and metabolic regulation.
Purpose of the Study:
- To investigate the role of PKBalpha in the differentiation of mouse embryonic fibroblasts (MEFs) into adipocytes.
- To identify genes regulated by PKBalpha during adipogenesis.
Main Methods:
- Comparison of adipogenesis in wild-type and PKBalpha-knockout MEFs.
- Restoration of adipogenesis by expressing ectopic PKBalpha in deficient cells.
- Gene expression analysis to identify differentially regulated genes.
- Inhibition studies using LY294002 during 3T3-L1 adipocyte differentiation.
Main Results:
- PKBalpha deficiency completely prevents MEF differentiation into adipocytes.
- Ectopic expression of PKBalpha rescues adipogenesis in deficient cells.
- PKBalpha regulates the expression of approximately 80 genes during adipogenesis, including Krüppel-like transcription factor 15 (KLF15), lipocalin 2, renin 1, and receptor-activity-modifying protein 3.
- KLF15 expression is downregulated in PKBalpha-deficient MEFs but restored by active PKBalpha.
- LY294002, a PKBalpha inhibitor, reduces the expression of specific adipocyte genes during 3T3-L1 differentiation.
Conclusions:
- PKBalpha plays an essential and indispensable role in the transcriptional program governing adipogenesis.
- PKBalpha influences the expression of key regulators and functional genes in adipocytes, such as KLF15.
