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Hypoxia inhibits macrophage migration.

L Turner¹, C Scotton, R Negus

¹Biological Therapies Laboratory, Imperial Cancer Research Fund, London, GB.

European Journal of Immunology

|July 31, 1999

Summary

Hypoxia inhibits monocyte and macrophage migration towards monocyte chemoattractant protein-1 (MCP-1), but not lymphocyte migration. This rapid, reversible effect is likely due to metabolic changes, not gene regulation, impacting immune cell distribution in tumors.

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Area of Science:

Immunology
Cell Biology
Cancer Research

Background:

Monocyte chemoattractant protein (MCP)-1 influences immune cell infiltration in ovarian cancer.
Macrophages accumulate in hypoxic tumor regions with low MCP-1 expression.
Hypoxia is prevalent in necrotic tumor areas.

Purpose of the Study:

To investigate the effect of hypoxia on MCP-1-induced migration of monocytic cells and macrophages.
To determine if hypoxia affects lymphocyte migration.
To elucidate the mechanisms behind hypoxia-induced migration inhibition.

Main Methods:

Migration assays using THP-1 monocytic cells and human macrophages under normoxic and hypoxic conditions.
Assessment of MCP-1 receptor (CCR2B) expression and intracellular calcium levels.

Related Experiment Videos

Analysis of mRNA expression for macrophage migration inhibitory factor.

Chemotaxis assays with various chemokines and phagocytosis assays.

Main Results:

Hypoxia significantly inhibits MCP-1-induced migration of monocytic cells and macrophages.
Lymphocyte migration remains unaffected by hypoxia.
Inhibition is rapid, reversible, and not mediated by changes in CCR2B expression or soluble factors.
Hypoxia also inhibits chemotaxis to other chemokines but not phagocytosis.

Conclusions:

Hypoxia impairs monocyte and macrophage chemotaxis, likely through metabolic alterations rather than gene regulation.
This finding suggests a role for transient hypoxia in regulating immune cell distribution within tumors and inflammatory sites.
Differential effects of hypoxia on immune cell migration may influence the tumor microenvironment.