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Microbiol. Rev., 06 1996, 316-341, Vol 60, No. 2
B Henderson, S Poole and M Wilson
Cytokines are a diverse group of proteins and glycoproteins which have
potent and wide-ranging effects on eukaryotic cell function and are now
recognized as important mediators of tissue pathology in infectious
diseases. It is increasingly recognized that for many bacterial species,
cytokine induction is a major virulence mechanism. Until recent years, the
only bacterial component known to stimulate cytokine synthesis was
lipopolysaccharide (LPS). It is only within the past decade that it has
been clearly shown that many components associated with the bacterial cell
wall, including proteins, glycoproteins, lipoproteins, carbohydrates, and
lipids, have the capacity to stimulate mammalian cells to produce a diverse
array of cytokines. It has been established that many of these
cytokine-inducing molecules act by mechanisms distinct from that of LPS,
and thus their activities are not due to LPS contamination. Bacteria
produce a wide range of virulence factors which cause host tissue
pathology, and these diverse factors have been grouped into four families:
adhesins, aggressins, impedins, and invasins. We suggest that the array of
bacterial cytokine-inducing molecules represents a new class of bacterial
virulence factor, and, by analogy with the known virulence families, we
suggest the term "modulin" to describe these molecules, because the action
of cytokines is to modulate eukaryotic cell behavior. This review
summarizes our current understanding of cytokine biology in relation to
tissue homeostasis and disease and concisely reviews the current literature
on the cytokine-inducing molecules produced by gram-negative and gram-
positive bacteria, with an emphasis on the cellular mechanisms responsible
for cytokine induction. We propose that modulins, by controlling the host
immune and inflammatory responses, maintain the large commensal flora that
all multicellular organisms support.
Copyright © 1996, American Society for Microbiology
Bacterial modulins: a novel class of virulence factors which cause host tissue pathology by inducing cytokine synthesis
Maxillofacial Surgery Research Unit, University College London, United Kingdom. B.Henderson@Eastman.ucl.ac.uk
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