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C-reactive protein-mediated phagocytosis of Leishmania donovani promastigotes does not alter parasite survival or macrophage responses

Bodman-Smith, K. B., Mbuchi, M., Culley, F. J., Bates, Paul and Raynes, J. G. (2002) 'C-reactive protein-mediated phagocytosis of Leishmania donovani promastigotes does not alter parasite survival or macrophage responses'. Parasite Immunology, Vol 24, Issue 9-10, pp. 447-454.

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Abstract

C-reactive protein (CRP) is an acute phase protein that binds to surface structures of a number of different organisms. Leishmania donovani express CRP ligand when first entering the mammalian host and CRP has been shown to alter macrophage function. The aim of this study was to investigate the functional significance of CRP-mediated uptake of L. donovani on survival of the parasite within human macrophages and macrophage cell responses to the infection. CRP opsonized L. donovani uptake was inhibitable by including excess CRP in the fluid phase, suggesting Fc receptor usage rather than indirect complement-mediated uptake. Comparing equivalent initial infection loads, parasite survival over 72 h within peripheral blood derived macrophages (PBMs) and differentiated U937 cells was unaltered by CRP. Whereas CRP increased macrophage responses to phosphorylcholine coated erythrocytes, no significant alteration in tumour necrosis factor-alpha, interleukin (IL)-10 or IL-12 production from PBMs was observed between CRP opsonized or unopsonized L. donovani promastigotes. Thus, in contrast to other systems, where CRP opsonization results in macrophage activation, Leishmania can use CRP to improve infection without inducing detrimental macrophage activation.

Item Type: Article
Subjects: QW Microbiology and Immunology > Immune Responses > QW 700 Infection. Mechanisms of infection and resistance.
WC Communicable Diseases > Tropical and Parasitic Diseases > WC 715 Visceral leishmaniasis
Faculty: Department: Groups (2002 - 2012) > Molecular & Biochemical Parasitology Group
Digital Object Identifer (DOI): https://doi.org/10.1046/j.1365-3024.2002.00486.x
Depositing User: Martin Chapman
Date Deposited: 18 Dec 2012 14:38
Last Modified: 06 Feb 2018 13:04
URI: https://archive.lstmed.ac.uk/id/eprint/2895

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