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Visualization and Quantification of Brown and Beige Adipose Tissues in Mice using [18F]FDG Micro-PET/MR Imaging
Published on: July 1, 2021
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GRAF1 Regulates Brown and Beige Adipose Differentiation and Function
Xue Bai1, Qiang Zhu1, Matthew Combs1
1University of North Carolina at Chapel Hill.
Research Square
|January 10, 2024
Summary
GRAF1 promotes the browning of white adipose tissue (WAT) and maturation of brown adipose tissue (BAT), enhancing energy expenditure. Manipulating GRAF1 may offer new therapies for metabolic dysfunction.
Area of Science:
- Cell Biology
- Metabolism
- Endocrinology
Background:
- Adipose tissue, comprising white (WAT) and brown (BAT) adipocytes, regulates body energy balance.
- The RhoA/ROCK pathway is vital for adipocyte development, but its specific regulators in adipose depots are unknown.
- A selective regulator for adipocyte browning has not been identified.
Approach:
- Investigated the role of GRAF1, a RhoGAP highly expressed in metabolically active tissues.
- Analyzed GRAF1 expression in relation to brown adipocyte differentiation in vitro and in vivo.
- Generated global and adipocyte-specific GRAF1-deficient mice to assess its function in BAT maturation, WAT browning, and cold-induced thermogenesis.
- Examined the effect of Rho kinase inhibition on GRAF1-deficient preadipocyte differentiation.
Key Points:
- GRAF1 expression correlates with brown adipocyte differentiation.
- GRAF1 deficiency impairs BAT maturation, WAT browning, and cold-induced thermogenesis.
- Rho kinase inhibition rescues differentiation defects in GRAF1-deficient brown preadipocytes.
Conclusions:
- GRAF1 selectively induces brown and beige adipocyte differentiation.
- GRAF1 plays a critical role in adipose tissue thermogenesis and metabolic health.
- Targeting GRAF1 may offer therapeutic strategies for metabolic dysfunction.
