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Infect. Immun., 04 1996, 1342-1350, Vol 64, No. 4
M Kocher, PA Kenny, E Farram, KB Abdul Majid, JJ Finlay-Jones and L Geczy C
Murine abscesses induced by intraperitoneal injection of a mixture of
Escherichia coli, Bacteroides fragilis, and bran are established models for
the study of localized infectious and inflammatory lesions. Chemotactic
factors are though to mediate the directed migration of large numbers of
leukocytes into the abscess. Microorganisms located within the encapsulated
lesion are not readily eliminated by the leukocytes, but their numbers are
controlled over many weeks. We report the presence of large amounts of two
murine S100 proteins, CP-10 and migration inhibition factor-related protein
14 (MRP-14), in abscesses as demonstrated by immunohistochemistry and
measured by enzyme-linked immunosorbent assay and Western blotting
(immunoblotting). High levels of CP-10 (7.7 +/- 1 mg/ml) and MRP-14 (5.5
+/- 1 mg/ml) were found throughout the time course of abscess development
from early acute- phase lesions, which are predominantly neutrophilic, to
late chronic- phase lesions, which contained more mononuclear cells.
Approximately one-third of these amounts occurred as monomers (2.0 mg/ml
for MRP 14 and 2.2 mg/ml for CP-10). Abscess fluid was strongly
chemotactic, and a portion of the activity was due to CP-10, indicating its
important role in leukocyte recruitment. CP-10-MRP-14 complexes were
present in abscess fluid, and the proteins were immunoabsorbed together. In
analogy with the related human MRP-8-MRP-14 complex, these proteins could
be involved in the inhibition of microbial growth. No growth inhibition
occurred with 20 microgram of CP-10 or MRP-14 per ml or with mixtures of
both, but these concentrations may have been insufficient and were not
representative of the high concentrations found within abscesses. CP-10 may
contribute indirectly to the antimicrobial response in abscesses by virtue
of its strong chemotactic properties and its capacity to modulate the
activation state of recruited leukocytes.
Copyright © 1996, American Society for Microbiology
Functional chemotactic factor CP-10 and MRP-14 are abundant in murine abscesses
The Heart Research Institute, Camperdown, Sydney, New South Wales, Australia.
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