Effect of Mycobacterium leprae lipids on BCG- and carrageenan-induced cellular recruitment in mouse pleurisy.
Pathogenic mycobacteria survive inside macrophages and deactivate these cells, using a mechanism that is still poorly understood. Mycobacterial cell wall lipids constitute the first contact with the host cell. Although Mycobaterium leprae and M. bovis BCG share common antigens, they induce opposite inflammatory responses. Apolar M. leprae lipids have been shown to be anti-inflammatory by down-regulating macrophage activation and T-cell functions. We wonder if these lipids would influence cellular migration to BCG or to other inflammatory agent. We investigated the effect of M. leprae, its lipids or delipidated bacteria on acute and chronic BCG- or carrageenan-induced pleurisy. Previous injection of intact or delipidated M. leprae did not alter either the BCG- or carrageenan-induced pleural inflammatory reaction. However, M. leprae lipids enhanced carrageenan-induced acute cellular migration without impairing BCG inflow; moreover, they reduced BCG chronic response. Together these data suggest distinct mechanisms for intracellular deactivation and pleural cell recruitment exerted by mycobacterial structures.
Moura
A C N
AC
Department of Cell Biology and Genetics, Universidade do Estado do Rio de Janeiro, R. São Francisco Xavier 524, PHLC 20550-013 Rio de Janeiro, Brazil. cmoura@uerj.br
Bastos
A P M R
AP
Cordeiro
R S B
RS
Henriques
M G M O
MG
D000818:Animals; D001500:BCG Vaccine / Q000494:pharmacology; D002351:Carrageenan / Q000494:pharmacology; D002465:Cell Movement / Q000187:drug effects; D008055:Lipids / Q000494:pharmacology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009166:Mycobacterium leprae / Q000502:physiology*; D010998:Pleurisy / Q000473:pathology*
D001500:BCG Vaccine; D008055:Lipids; D002351:Carrageenan