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Quantitative In vitro Assay to Measure Neutrophil Adhesion to Activated Primary Human Microvascular Endothelial Cells under Static Conditions
Published on: August 23, 2013
Size-fractionated heparins have differential effects on human neutrophil function in vitro
1Department of Pharmacology, School of Pharmacy, University of London, London, UK. rebecca.lever@pharmacy.ac.uk
British Journal of Pharmacology
|May 30, 2007
Summary
Fractionating heparin revealed that specific molecular sizes, around 10 saccharides, effectively inhibit neutrophil elastase release. This finding suggests potential for developing targeted anti-inflammatory drugs by optimizing heparin chain length for non-anticoagulant effects.
Area of Science:
- Biochemistry
- Immunology
- Pharmacology
Background:
- Heparin exhibits anti-inflammatory properties beyond anticoagulation.
- Key anti-inflammatory effects include inhibiting neutrophil elastase release and cell adhesion.
Purpose of the Study:
- To investigate if heparin fractionation can yield molecules with enhanced or specific effects on human neutrophil function.
- To explore the relationship between heparin molecular size and its non-anticoagulant activities.
Main Methods:
- Heparin was fractionated into defined molecular sizes.
- Assessed effects of fractions on neutrophil elastase release induced by formyl Met-Leu-Phe (fMLP) and tumor necrosis factor-alpha (TNF-alpha).
- Examined effects of fractions on neutrophil adhesion to interleukin-1beta (IL-1beta)-stimulated endothelial cells (HUVECs).
Main Results:
- Very low molecular weight heparin fractions (minimum 10 saccharides) significantly inhibited elastase release.
- Neutrophil adhesion to endothelial cells was not affected by fractionated heparins.
- Suggests that specific non-anticoagulant actions may be diminished by fractionation.
Conclusions:
- An optimal heparin chain length likely exists for specific non-anticoagulant actions.
- Findings support the potential for designing novel anti-inflammatory drugs with targeted heparin structures.
- Further research into heparin's structure-activity relationship for anti-inflammatory effects is warranted.
