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Updated: Mar 19, 2026

Differentiation and Imaging of Brown Adipocytes from the Stromal Vascular Fraction of Interscapular Adipose Tissue from Newborn Mice
Published on: February 3, 2023
β-arrestin-1 contributes to brown fat function and directly interacts with PPARα and PPARγ
Congcong Wang1,2, Xianglu Zeng1,3,4, Zhaocai Zhou1
1State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031, China.
Beta-arrestin-1 knockout mice exhibit improved cold tolerance. This protein directly interacts with PPARs, influencing their activity and brown adipose tissue function, revealing a novel regulatory pathway for energy homeostasis.
Area of Science:
- Molecular Biology
- Metabolism
- Cell Signaling
Background:
- Peroxisome proliferator-activated receptors (PPARs) are crucial for brown adipose tissue (BAT) development and thermogenesis.
- Cellular signaling networks tightly regulate PPAR transcriptional activity.
- Beta-arrestins act as key mediators in G protein-coupled receptor (GPCR) signaling pathways.
Purpose of the Study:
- To investigate the role of beta-arrestin-1 in regulating brown adipose tissue function and cold tolerance.
- To identify direct interactions between beta-arrestin-1 and PPAR family members.
Main Methods:
- Utilized beta-arrestin-1 knockout mouse models to assess cold tolerance.
- Performed co-immunoprecipitation assays to confirm direct physical interactions between beta-arrestin-1 and PPARs.
- Conducted reporter assays to evaluate the impact of beta-arrestin-1 on PPAR transcriptional activity.
Main Results:
- Beta-arrestin-1 knockout mice displayed enhanced cold tolerance.
- Beta-arrestin-1 was found to directly bind to PPAR-alpha and PPAR-gamma via a specific motif (LXXXLXXXL).
- Specific amino acid residues in PPAR-alpha (D371) and PPAR-gamma (L311/N312/D380) are critical for beta-arrestin-1 interaction.
- Beta-arrestin-1 differentially regulates PPAR activity, promoting PPAR-alpha but inhibiting PPAR-gamma transcriptional function.
Conclusions:
- Beta-arrestin-1 plays a significant role in modulating brown adipose tissue function and cold adaptation.
- The interaction between beta-arrestin-1 and PPARs represents a novel regulatory mechanism impacting energy metabolism.
- This finding offers potential therapeutic targets for metabolic disorders related to energy expenditure.
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