Dietary (n-3) polyunsaturated fatty acids do not affect the in vivo development and function of Listeria-specific CD4+ and CD8+ effector and memory/effector T cells in mice.
We previously reported that in a mouse model, a diet high in (n-3) PUFA diminishes host survival following an infection from Listeria monocytogenes, a gram-positive bacterial pathogen. In this study we investigated the impact of (n-3) PUFA on the adaptive immune response to L. monocytogenes. BALB/c mice were fed experimental diets either devoid of or rich in (n-3) PUFA from fish oil for 4 wk and then infected with 10(6) actA-deficient L. monocytogenes. At 7 and 35 d postchallenge, effector and memory/effector T cells in the spleen were enumerated by flow cytometry. Surprisingly, the number of Listeria-specific CD4(+) and CD8(+) effector and memory/effector T cells in the spleen was not affected by (n-3) PUFA. Also, the effector cells derived from mice fed either diet were equally capable of conferring protective immunity upon adoptive transfer to naive recipients. Despite our previous data, which demonstrated that (n-3) PUFA profoundly impaired host resistance to L. monocytogenes, pathogen-specific T cell responses were not substantially affected by dietary (n-3) PUFA.
Irons
Robert
R
Department of Nutritional Sciences, Division of Animal Sciences, University of Missouri, Columbia 65211, USA.
Pinge-Filho
Phileno
P
Fritsche
Kevin L
KL
D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000187:drug effects / Q000276:immunology* / Q000382:microbiology; D018414:CD8-Positive T-Lymphocytes / Q000187:drug effects / Q000276:immunology* / Q000382:microbiology; D004041:Dietary Fats; D015525:Fatty Acids, Omega-3 / Q000494:pharmacology*; D005260:Female; D005395:Fish Oils / Q000494:pharmacology; D005434:Flow Cytometry; D007156:Immunologic Memory / Q000187:drug effects; D008089:Listeria monocytogenes; D008088:Listeriosis / Q000276:immunology* / Q000517:prevention & control; D051379:Mice; D008807:Mice, Inbred BALB C; D023421:Models, Animal
D004041:Dietary Fats; D015525:Fatty Acids, Omega-3; D005395:Fish Oils; C029310:lard