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Updated: Jun 28, 2026

An Adipocyte Cell Culture Model to Study the Impact of Protein and Micro-RNA Modulation on Adipocyte Function

An Adipocyte Cell Culture Model to Study the Impact of Protein and Micro-RNA Modulation on Adipocyte Function

Published on: May 4, 2021

LPS and proinflammatory cytokines decrease lipin-1 in mouse adipose tissue and 3T3-L1 adipocytes.

Biao Lu¹, Yang Lu, Arthur H Moser

¹Department of Veterans Affairs Medical Center, University of California, San Francisco, CA, USA.

American Journal of Physiology. Endocrinology and Metabolism

|October 23, 2008

Summary

This summary is machine-generated.

Infection and inflammation reduce lipin-1, a key triglyceride synthesis enzyme, in adipose tissue. This suppression may increase circulating free fatty acids (FFA) during the acute-phase response.

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Area of Science:

Metabolic regulation
Molecular biology
Immunology

Background:

Infection and inflammation trigger the acute-phase response, altering adipose triglyceride metabolism and increasing plasma free fatty acids (FFA) and VLDL.
Lipin-1 is a crucial protein regulating adipose differentiation, mitochondrial oxidation, and triglyceride synthesis.

Purpose of the Study:

To investigate the regulation of lipin-1 expression in adipose tissue by lipopolysaccharide (LPS), zymosan, and proinflammatory cytokines.
To elucidate the molecular pathways involved in LPS-induced lipin-1 repression.

Main Methods:

Administration of LPS and zymosan to mice to assess lipin-1 mRNA and protein levels in adipose tissue.
Treatment of cultured 3T3-L1 adipocytes with proinflammatory cytokines (TNF-alpha, IL-1beta, IFN-gamma, LPS, IL-6).
Analysis of lipin-1 expression in TNF-alpha/IL-1 receptor-null mice following LPS administration.

Main Results:

LPS and zymosan administration significantly decreased lipin-1 mRNA and protein levels in mouse adipose tissue, while lipin-2 and -3 mRNA remained unchanged.
Proinflammatory cytokines TNF-alpha, IL-1beta, and IFN-gamma, but not LPS or IL-6, reduced lipin-1 mRNA in cultured adipocytes.
LPS-induced lipin-1 repression was partially attenuated in TNF-alpha/IL-1 receptor-null mice, indicating roles for these cytokines and others.

Conclusions:

Lipin-1 expression is suppressed by LPS, zymosan, and key proinflammatory cytokines in adipose tissue.
This suppression may impair triglyceride synthesis in adipocytes, leading to increased FFA release into circulation.
Lipin-1 repression contributes to altered lipid metabolism during infection and inflammation.