Medium-chain, triglyceride-containing lipid emulsions increase human neutrophil beta2 integrin expression, adhesion, and degranulation

To test the hypothesis that lipid emulsions with different triglyceride structures have distinct immunomodulatory properties, we analyzed human neutrophil adhesion and degranulation after lipid incubation. Neutrophils, isolated from the blood of 10 healthy volunteers, were incubated in medium or phy...

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Bibliographic Details
Published in:JPEN. Journal of parenteral and enteral nutrition 2000-07, Vol.24 (4), p.228-233
Main Authors: Wanten, G J, Geijtenbeek, T B, Raymakers, R A, van Kooyk, Y, Roos, D, Jansen, J B, Naber, A H
Format: Article
Language:English
Subjects:
Adult
CD18 Antigens - metabolism
Cell Adhesion - physiology
Cell Degranulation - physiology
Fat Emulsions, Intravenous - administration & dosage
Fat Emulsions, Intravenous - pharmacology
Female
Flow Cytometry
Humans
Intercellular Adhesion Molecule-1 - metabolism
Male
Middle Aged
Neutrophils - drug effects
Neutrophils - physiology
Triglycerides - administration & dosage
Triglycerides - pharmacology
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Summary:To test the hypothesis that lipid emulsions with different triglyceride structures have distinct immunomodulatory properties, we analyzed human neutrophil adhesion and degranulation after lipid incubation. Neutrophils, isolated from the blood of 10 healthy volunteers, were incubated in medium or physiologic (2.5 mmol/L) emulsions containing long-chain (LCT), medium-chain (MCT), mixed LCT/MCT, or structured (SL) triglycerides. Expression of adhesion molecules and degranulation markers was evaluated by flow cytometry. Also, functional adhesion was investigated by means of a flow cytometric assay using fluorescent beads coated with the integrin ligand intercellular adhesion molecule (ICAM)-1. Although LCT and SL had no effect, LCT/MCT significantly increased expression of the beta2 integrins lymphocyte-function-associated antigen 1 (+18%), macrophage antigen 1 (+387%), p150,95 (+82%), and (alphaDbeta2 (+230%). Degranulation marker expression for azurophilic (CD63, +210%) and specific granules (CD66b, +370%) also significantly increased, whereas L-selectin (CD62L, -70%) decreased. The effects of LCT/MCT were mimicked by the MCT emulsion. ICAM-1 adhesion (% beads bound) was increased by LCT/MCT (34% +/- 4%), whereas LCT (19% +/-3%) and SL (20% +/- 2%) had no effect compared with medium (17% +/- 3%). LCT/MCT and MCT, contrary to LCT and SL emulsions, increased neutrophil beta2 integrin expression, adhesion, and degranulation. Apart from other emulsion constituents, triglyceride chain length might therefore be a key feature in the interaction of lipid emulsions and the phagocyte immune system.
ISSN:0148-6071