Journal
MICROBES AND INFECTION
Volume 10, Issue 12-13, Pages 1379-1386Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micinf.2008.08.004
Keywords
Lipid signalling; Host-pathogen interaction; Inflammatory response; Phagosome maturation; Intracellular trafficking; MAP kinase p38
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Funding
- FCT
- FEDER [POCI/BIA-BCM/55327/2004, SFRWBD/14284/2003]
- Fundação para a Ciência e a Tecnologia [POCI/BIA-BCM/55327/2004] Funding Source: FCT
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We recently showed that treatment of macrophages prior to Mycobacterium tuberculosis infection with the pro-inflammatory omega-6 lipid, arachidonic acid (AA) enhanced bacterial killing whereas the anti - inflammatory, omega-3 lipid eicosapentaenoic acid (EPA) stimulated bacterial growth. Here we tested if these effects were depending on when lipids were added to macrophages: before or during Mycobacterium smegmatis or M. tuberculosis infection. Collectively, our data suggested that a high omega-6 diet might be beneficial against mycobacteriosis, while a high omega-3 diet might be detrimental. AA also stimulated TNF-alpha secretion in M. tuberculosis-infected macrophages whereas EPA inhibited this process. AA strongly activated the MAP kinase p38 in uninfected cells but M. tuberculosis infected cells blocked the ability of AA to activate p38; AA-dependent killing is therefore independent of p38. We therefore tested diets enriched in omega-3 and omega-6 lipids on a mouse model of tuberculosis. In contrast to the in vitro results, the omega-6 tended to increase survival of M. tuberculosis in mice, while omega-3-tended to increase pathogen killing. Overall our results together with those previously reported in the literature suggest that it is almost impossible to predict, at the whole organism level, if a diet enriched in omega-3 or -6 will be beneficial or detrimental to intracellular pathogens. (C) 2008 Elsevier Masson SAS. All rights reserved.
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