HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) Purchase Article View Shopping Cart Alert me when this article is cited Alert me if a correction is posted Citation Map Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Bassaganya-Riera, J. Articles by Hontecillas, R. Search for Related Content PubMed PubMed Citation Articles by Bassaganya-Riera, J. Articles by Hontecillas, R. Agricola Articles by Bassaganya-Riera, J. Articles by Hontecillas, R.

Arachidonic acid–and docosahexaenoic acid–enriched formulas modulate antigen-specific T cell responses to influenza virus in neonatal piglets^1,2,3

¹ From the Nutritional Immunology & Molecular Nutrition Laboratory, Department of Human Nutrition Foods and Exercise (JB-R, AJG, AMN, KAR, JK, and RH), and the Department of Animal and Poultry Sciences (CMW and MA), Virginia Tech University, Blacksburg, VA, and Mead Johnson Nutritionals/Bristol Myers Squibb, Evansville, IN (DR)

Background: Whereas the immunomodulatory effects of feeding either arachidonic acid (AA) or docosahexaenoic acid (DHA) separately have been previously investigated, little is known about the immunomodulatory efficacy of AA or DHA when they are fed in combination as infant formula ingredients.

Objective: The objective of this study was to investigate the ability of AA- and DHA(AA/DHA)-enriched infant formula to modulate immune responses in the neonate in response to an inactivated influenza virus vaccine.

Design: Neonatal piglets (n = 48) were weaned on day 2 of age and distributed into 16 blocks of 3 littermate piglets each. Within each block, piglets were randomly assigned to a control formula, AA/DHA-enriched formula (0.63% AA and 0.34% DHA), or sow milk for 30 d. On day 9, 8 blocks of piglets were immunized with an inactivated influenza virus vaccine. On days 0, 9, 16, 23, and 30 after weaning, we measured influenza virus–specific T cell proliferation and phenotype of T subsets in peripheral blood. A delayed-type hypersensitivity reaction test was administered on day 28. Cytokine messenger RNA expression was determined by quantitative real time reverse transcriptase–polymerase chain reaction on day 30.

Results: The influenza virus–specific CD4⁺ and CD8⁺ T cell ex vivo lymphoproliferative responses were significantly lower on day 23 after immunization in piglets receiving dietary AA/DHA supplementation and sow milk than in those receiving the unsupplemented control formula. The immunomodulatory effects of AA/DHA-enriched formulas were consistent with up-regulation of interleukin 10 in peripheral blood mononuclear cells.

Conclusion: Overall, it appears that the AA/DHA-enriched formula modulated antigen-specific T cell responses in part through an interleukin 10–dependent mechanism.

Key Words: Arachidonic acid • docosahexaenoic acid • immunity • growth • piglets

This article has been cited by other articles:

				N. P. Evans, S. A. Misyak, E. M. Schmelz, A. J. Guri, R. Hontecillas, and J. Bassaganya-Riera Conjugated Linoleic Acid Ameliorates Inflammation-Induced Colorectal Cancer in Mice through Activation of PPAR{gamma} J. Nutr., March 1, 2010; 140(3): 515 - 521. [Abstract] [Full Text] [PDF]