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Background: Immunoregulatory probiotics (immunobiotics) have been proposed to improve piglets? immune system to avoid intestinal infections and reduce unproductive inflammation after weaning. Previously, it was demonstrated that Lactobacillus jensenii TL2937 (LjTL2937) attenuated the inflammatory response triggered by activation of Toll-like receptor 4 (TLR-4) in porcine intestinal epithelial (PIE) cells and antigen presenting cells (APCs) from porcine Peyer?s patches (PP). Objective: In view of the critical importance of PIE-APCs interactions in the regulation of intestinal immune responses, we aimed to examine the effect of LjTL2937 on activation patterns of APCs from swine PPs in co-cultures with PIE cells. In addition, we investigated whether LjTL2937 was able to beneficially modulate intestinal immunity of piglets after weaning to improve immune-health status. Results: Stimulation of PIE-APCs co-cultures with LjTL2937 increased the expression of MHC-II, CD80/86, IL-10, and Bcl-3 in CD172a+CD11R1␣ and CD172a+CD11R1high APCs. In addition, the TL2937 strain caused the upregulation of three negative regulators of TLR4 in PIE cells: MKP-1, Bcl-3 and A20. These changes significantly reduced the inflammatory response triggered by TLR4 activation in PIE-APCs co-cultures. The in vivo experiments using castrated male piglets (crossbreeding (LWD) with Landrace (L), Large Yorkshire (W) and Duroc (D))of 3 weeks of age demonstrated that feeding with LjTL2937 significantly reduced blood complement activity and C reactive protein concentrations while no changes were observed in blood leukocytes, ratio of granulocytes to lymphocyte numbers, macrophages? activity and antibody levels. In addition, treatment with LjTL2937 significantly improved growth performance and productivity, and increased carcass quality. Conclusions: We demonstrated that the use of immunobiotics strains like LjTL2937, as supplemental additives for piglets feedings, could be used as a strategy to maintain and improve intestinal homeostasis; that is important for the development of the pig and for health and performance throughout the productive life of the animal. Fil: Suda, Yoshihito. Miyagi University. Department of Food, Agriculture and Environment; Japón Fil: Villena, Julio Cesar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Tucumán. Centro de Referencia para Lactobacilos (i); Argentina. Tohoku University. Graduate School of Agricultural Science. Laboratory of Animal Products Chemistry. Food and Feed Immunology Group; Japón Fil: Takahashi, Yu. Miyagi University. Department of Food, Agriculture and Environment; Japón Fil: Hosoya, Shoichi . Tohoku University. Graduate School of Agricultural Science. Laboratory of Animal Products Chemistry. Food and Feed Immunology Group; Japón Fil: Tomosada, Yohsuke. Tohoku University. Graduate School of Agricultural Science. Laboratory of Animal Products Chemistry. Food and Feed Immunology Group; Japón Fil: Tsukida, Kohichiro. Tohoku University. Graduate School of Agricultural Science. Laboratory of Animal Products Chemistry. Food and Feed Immunology Group; Japón Fil: Shimazu, Tomoyuki. Tohoku University. Graduate School of Agricultural Science. Laboratory of Animal Breading and Genetics ; Japón Fil: Aso, Hisashi. Tohoku University. Graduate School of Agricultural Science. Cell Biology Laboratory; Japón Fil: Tohno, Masanori . National Institute of Livestock and Grassland Science; Japón Fil: Ishida, Mitsuharu . Miyagi University. Department of Food, Agriculture and Environment; Japón Fil: Makino, Seiya . Meiji Co., Ltd. Division of Research and Development ; Japón Fil: Ikegami, Shuji . Meiji Co., Ltd. Division of Research and Development; Japón Fil: Kitazawa, Haruki . Tohoku University. Graduate School of Agricultural Science. Laboratory of Animal Products Chemistry. Food and Feed Immunology Group; Japón