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Leptin deficiency enhances sensitivity to endotoxin-induced lethality
R Faggioni1, G Fantuzzi, C Gabay
1Metabolism Section, Department of Veterans Affairs Medical Center, University of California, San Francisco, California 94121, USA.
The American Journal of Physiology
|January 14, 1999
Summary
Leptin plays a crucial role in the host immune response to lipopolysaccharide (LPS) and inflammation. Leptin deficiency increases susceptibility to LPS toxicity, while leptin treatment mitigates this effect.
Area of Science:
- Immunology
- Endocrinology
- Toxicology
Background:
- Leptin, a hormone, is induced by lipopolysaccharide (LPS) and cytokines.
- The role of leptin in LPS-induced toxicity requires further investigation.
Purpose of the Study:
- To investigate the role of leptin in lipopolysaccharide (LPS)-induced toxicity.
- To elucidate leptin's modulation of immune and cytokine responses during LPS exposure.
Main Methods:
- Utilized leptin-deficient (ob/ob) and leptin receptor-deficient (db/db) mice models.
- Assessed sensitivity to LPS-induced mortality, serum glucose, corticosterone, and cytokine levels (IL-1beta, TNF, MIP-1alpha, IFN-gamma, IL-10, IL-1Ra).
- Conducted in vitro experiments with macrophages to evaluate leptin's effect on IL-1Ra production.
Main Results:
- Leptin-deficient mice exhibited significantly greater sensitivity to LPS-induced mortality.
- LPS reduced serum glucose in both deficient models but induced corticosterone only in db/db mice.
- Blunted induction of IL-10 and IL-1 receptor antagonist (IL-1Ra) was observed in leptin-deficient mice; leptin treatment reversed LPS lethality.
Conclusions:
- Leptin is integral to the host response to LPS-induced inflammation.
- Leptin modulates immune and cytokine responses, influencing host defense mechanisms against LPS toxicity.
- Leptin administration can protect against LPS-induced lethality, highlighting its therapeutic potential.