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Updated: May 31, 2026

Measuring the Rate of Lipolysis in Ex Vivo Murine Adipose Tissue and Primary Preadipocytes Differentiated In Vitro
Published on: March 17, 2023
Inflammation inhibits GPR81 expression in adipose tissue
Kenneth R Feingold1, Arthur Moser, Judy K Shigenaga
1Metabolism Section (111F), Department of Veterans Affairs Medical Center, University of California San Francisco, 4150 Clement Street, San Francisco, CA 94121, USA. kenneth.feingold@ucsf.edu
Objective And Design:
The aim of this study was to examine the expression of G protein-coupled receptor 81 (GPR81) in mouse adipose tissue in response to inflammatory stimuli. GPR81 is activated by lactate resulting in the inhibition of lipolysis.
Materials And Treatment:
Mice were injected with saline, lipopolysaccharide (LPS), zymosan, or turpentine, N = 5 per group. 3T3-L1 adipocytes were treated with tumor necrosis factor alpha, interleukin (IL)-l beta, IL-6, or interferon gamma.
Methods:
GPR81 expression levels were measured by real-time PCR and statistical significance was determined by Student's t test.
Results:
LPS resulted in a marked decrease in GPR81 mRNA level in mouse adipose tissue in C57BL/6 and OuJ mice, an effect that was not observed in HeJ mice, which have a mutation in TLR4. Zymosan and turpentine also decreased adipose tissue GPR81 expression. Cytokine treatment of 3T3-L1 adipocytes had no effect on GPR81 expression. GPR81 expression was decreased in ob/ob mice, an animal model of type 2 diabetes that is characterized by inflammation.
Conclusion:
Inflammation decreases the expression of GPR81 in adipose tissue.
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