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Leptin induces an inflammatory phenotype in lean Wistar rats
Monique Allman1, Mathew Wallace, Latausha Gaskin
1Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center, Shreveport, LA 71130, USA.
Mediators of Inflammation
|February 13, 2010
Summary
Leptin, a hormone, directly promotes inflammation by increasing leukocyte adhesion and inflammatory gene expression in adipose tissue and liver. This suggests leptin plays a key role in systemic inflammation.
Area of Science:
- Endocrinology
- Immunology
- Molecular Biology
Background:
- Leptin is a key adipokine involved in energy homeostasis.
- Leptin's role in inflammation and leukocyte trafficking is not fully understood.
Purpose of the Study:
- To investigate the hypothesis that leptin promotes leukocyte trafficking into adipose tissue.
- To elucidate the direct effects of leptin on inflammatory markers in vivo and in vitro.
Main Methods:
- Male Wistar rats were treated with saline or recombinant rat leptin.
- Leukocyte trafficking in mesenteric venules was quantified using intravital microscopy.
- mRNA levels of inflammatory markers (IL-6, MCP-1) were measured in mesenteric adipose tissue, venules, and liver.
- Hepatocytes were treated with leptin to assess direct effects on inflammatory gene production.
Main Results:
- Leptin significantly increased leukocyte rolling (3-fold) and firm adhesion (5-fold) in mesenteric venules.
- Leptin elevated mRNA levels of IL-6 (8-fold) and MCP-1 (5-fold) in mesenteric adipose tissue, venules, and liver.
- Leptin treatment increased the production of ICAM-1, MCP-1, and IL-6 by hepatocytes.
Conclusions:
- Leptin directly promotes leukocyte trafficking and inflammation in mesenteric adipose tissue.
- Leptin exerts systemic inflammatory effects, impacting liver and vasculature.
- These findings highlight leptin's role as a mediator of inflammation in metabolic tissues.
