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Updated: Jan 8, 2026

Mechanism of Regulation of Adipocyte Numbers in Adult Organisms Through Differentiation and Apoptosis Homeostasis
Published on: June 3, 2016
SPSB proteins regulate adipocyte differentiation by targeting FOG-2 for proteasomal degradation
Yuka Sugiya1, Ken Maruyama2, Honoka Suzuki1
1Department of Pharmacology, School of Pharmaceutical Sciences, Ohu University, Koriyama, 963-8041, Japan.
Friend of GATA (FOG)-2 is degraded during adipocyte differentiation by the ubiquitin-proteasome system. SPRY domain- and SOCS box-containing (SPSB) proteins mediate this, revealing a new mechanism regulating fat cell development.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Friend of GATA (FOG)-2 is a transcriptional cofactor crucial for organ development.
- FOG-2 downregulation is essential for adipocyte differentiation, but the mechanism remains unclear.
Purpose of the Study:
- To elucidate the mechanism of FOG-2 degradation during adipogenesis.
- To identify the proteins involved in FOG-2 regulation.
Main Methods:
- Bioinformatic screening for FOG-2 interacting proteins.
- Biochemical assays to confirm protein-protein interactions and degradation.
- Cell culture experiments using 3T3-L1 preadipocytes.
Main Results:
- SPRY domain- and SOCS box-containing (SPSB) proteins, specifically SPSB1, SPSB2, and SPSB4, target FOG-2 for ubiquitin-proteasome degradation.
- SPSB1/2/4 recognize a specific motif (D-L-N-N-N) in FOG-2.
- Inhibition of SPSB1/2/4-mediated FOG-2 degradation impairs adipocyte differentiation.
Conclusions:
- FOG-2 is a substrate of the SPSB1/2/4-CRL5 ubiquitin ligase complex.
- The SPSB1/2/4-FOG-2 axis is a novel regulatory mechanism in adipocyte differentiation.
- Timely degradation of FOG-2 is critical for efficient fat cell development.
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