NDLI: Leishmania Promastigotes Release a Granulocyte Chemotactic Factor and Induce Interleukin-8 Release but Inhibit Gamma Interferon-Inducible Protein 10 Production by Neutrophil Granulocytes

Content Provider	PubMed Central
Author	Van, Zandbergen G. Hermann, N. Laufs, H. Solbach, W. Laskay, T.
Copyright Year	2002
Abstract	Recent data from our laboratory suggest that neutrophil granulocytes (polymorphonuclear leukocytes [PMN]) can serve as host cells for Leishmania major in the early phase of infection. In line with these findings, an early influx of PMN to the infected tissues was shown by others to be associated with susceptibility to infection with L. major. The mechanisms underlying the initial PMN recruitment to the site of infection is poorly understood. In the present study we investigated whether Leishmania can influence PMN migration. Supernatants of Leishmania promastigotes were tested for their chemotactic activity using an in vitro chemotaxis assay. All Leishmania species tested (L. major, L. aethiopica, and L. donovani) displayed a marked chemotactic effect on human PMN. However, no effect on the migration of macrophages and NK cells was observed. Checkerboard analysis revealed that the observed PMN migration was due to chemotaxis rather than chemokinesis. Most of the chemotactic activity was found in fractions containing molecules with sizes between 10 and 50 kDa. Pretreatment of PMN with N-formyl-methionyl-leucyl-phenylalanine blocked the chemotactic activity of Leishmania supernatants up to 75%. In addition, we found that leishmanial contact induced the release of interleukin-8 (IL-8) and inhibited the production of gamma interferon-inducible protein 10 (IP-10) by PMN. These data suggest that infection with Leishmania promastigotes leads to PMN accumulation via the production of a chemotactic factor by the parasites, and this effect is amplified by the induction of IL-8 production in PMN. On the other hand, the inhibition of IP-10 production can lead to prevention of NK cell activation.
Related Links	http://dx.doi.org/10.1128/iai.70.8.4177-4184.2002
Ending Page	4184
Page Count	8
Starting Page	4177
File Format	PDF
ISSN	00199567
e-ISSN	10985522
Journal	Infection and Immunity
Issue Number	8
Volume Number	70
Language	English
Publisher	American Society for Microbiology
Publisher Date	2002-08-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Immunology Microbiology Parasitology Infectious Diseases Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Infectious Diseases Parasitology Immunology Microbiology

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