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Sulfatides trigger cytokine gene expression and secretion in human monocytes
G Constantin1, C Laudanna, P Baron
1Institute of General Pathology, University of Verona, Italy.
FEBS Letters
|August 15, 1994
Summary
Sulfatides, a type of lipid, activate human monocytes, increasing intracellular calcium and promoting the release of inflammatory cytokines like tumor necrosis factor and interleukins. This suggests sulfatides amplify inflammatory responses at inflammation sites.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Sulfatides are glycosphingolipids found in cell membranes.
- Their role in initiating cellular signaling pathways, particularly in immune cells, is not fully understood.
Purpose of the Study:
- To investigate the signaling capabilities of sulfatides in human monocytes.
- To determine if sulfatides can activate specific cellular functions, such as cytokine production.
Main Methods:
- Monocytes were treated with sulfatides and non-sulfated galactocerebrosides.
- Changes in cytosolic free calcium levels were measured.
- Expression of cytokine mRNAs (TNF, IL-8, IL-1β, IL-12) was analyzed.
- Cytokine secretion into the extracellular medium was quantified.
Main Results:
- Sulfatides induced a significant increase in cytosolic free calcium in monocytes, dependent on intracellular calcium release.
- Non-sulfated galactocerebrosides did not affect cytosolic calcium levels.
- Sulfatides enhanced the expression of tumor necrosis factor, interleukin-8, and interleukin-1 beta mRNAs.
- Sulfatides triggered cytokine secretion, though less effectively than lipopolysaccharide.
- The sulfation of the galactose ring was crucial for these effects.
Conclusions:
- Sulfatides can act as signaling molecules in human monocytes.
- They trigger transmembrane signals and activate cellular functions, including cytokine expression and secretion.
- These findings highlight the role of sulfatides in amplifying inflammatory reactions at sites of inflammation.