Influence of volatile fatty acids on human granulocyte chemotaxis

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Abstract
Volatile fatty acids (VFA) have interesting biological effects on eukaryotic cells, inducing alterations of cell shape, morphological differentiation, changes in the composition of the cytoplasmic membrane and growth inhibition. This paper describes the effects of VFA on granulocyte chemotaxis. The influences observed, usually inhibitory, were shown to depend on the concentration tested and the incubation atmosphere (anaerobic or 5% CO2). Because these metabolites are produced by several anaerobic bacteria both in vitro and at infected sites, one can speculate that they might act as potential ‘leukotoxins’ contributing to the pathogenicity of anaerobic bacteria. We suggest that the well-known ability of anaerobes to inhibit their own phagocytosis and intracellular killing, as well as that of facultative anaerobes, might be at least partially due to the impairment of granulocyte functions induced by VFA.

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