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Originally published online as doi:10.1189/jlb.0607401 on November 6, 2007

Published online before print November 6, 2007
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(Journal of Leukocyte Biology. 2008;83:272-279.)
© 2008 by Society for Leukocyte Biology

Salmonella infection of afferent lymph dendritic cells

Simon S. M. Chan, Pietro Mastroeni, Ian McConnell and Barbara A. Blacklaws1

Department of Veterinary Medicine, University of Cambridge, Cambridge, United Kingdom

1 Correspondence: Department of Veterinary Medicine, University of Cambridge, Madingley Road, Cambridge, CB3 0ES, UK. E-mail: bab2{at}cam.ac.uk

ABSTRACT

The interactions of Salmonella enterica subspecies I serotype Abortusovis (S. Abortusovis) with ovine afferent lymph dendritic cells (ALDCs) were investigated for their ability to deliver Maedi visna virus (MVV) GAG p25 antigens to ALDCs purified from afferent lymph. Salmonellae were found to enter ALDC populations by a process of cell invasion, as confirmed by electron and confocal microscopy. This led to phenotypical changes in ALDC populations, as defined by CD1b and CD14 expression. No differences in the clearance kinetics of intracellular aroA-negative Salmonella from CD1b+ CD14lo and CD1b+ CD14– ALDC populations were noted over 72 h. ALDCs were also shown to present MVV GAG p25 expressed by aroA-negative S. Abortusovis to CD4+ T lymphocytes. Thus, the poor immune responses that Salmonella vaccines elicited in large animal models compared with mice are neither a result of an inability of Salmonella to infect large animal DCs nor an inability of these DCs to present delivered antigens. However, the low efficiency of infection of ALDC compared with macrophages or monocyte-derived DCs may account for the poor immune responses induced in large animal models.

Key Words: Salmonella enterica subspecies I serotype Abortusovis • Salmonella Abortus ovis • sheep • cannulation • lymphatic






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