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IL-6 increases endothelial permeability in vitro.

N Maruo¹, I Morita, M Shirao

¹Section of Physiological Chemistry, Faculty of Dentistry, Tokyo Medical and Dental University, Japan.

|August 1, 1992

Summary

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Interleukin 6 (IL-6) increases endothelial permeability, allowing albumin to pass through cell layers. This effect is reversible and linked to cellular changes, not toxicity.

Area of Science:

Endothelial biology
Immunology
Cellular physiology

Background:

Endothelial cells form a barrier regulating substance passage.
Interleukin 6 (IL-6) is a cytokine with diverse biological roles.
Understanding IL-6's impact on endothelial barrier function is crucial.

Purpose of the Study:

To investigate the effect of Interleukin 6 (IL-6) on endothelial permeability.
To determine the concentration and time dependency of IL-6's effect.
To elucidate the cellular mechanisms underlying IL-6-induced permeability changes.

Main Methods:

Cultured bovine vascular endothelial cells (BVEC) on micropore filters.
Measured fluorescein isothiocyanate-labeled albumin flux across the monolayer.

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Utilized modified Boyden chambers and light microscopy for analysis.

Main Results:

IL-6 significantly increased endothelial permeability to albumin in a dose- and time-dependent manner.
IL-6 induced changes in endothelial cell shape and actin filament rearrangement.
The effect was reversible upon IL-6 removal and showed no cytotoxicity.

Conclusions:

IL-6 enhances endothelial permeability in vitro.
Mechanisms involve actin rearrangement and cell shape modulation.
IL-6's impact on endothelial barrier function is dynamic and reversible.