Invasivelactococcus Lactisproducing Mycobacterial Hsp65 Ameliorates Intestinal Inflammation In Acute Tnbs-Induced Colitis In Mice By Increasing The Levels Of The Cytokine Il-10 And Secretory Iga

Aims To investigate the anti-inflammatory activity of an invasive and Hp65-producing strainLactococcus lactisNCDO2118 FnBPA+ (pXYCYT:Hsp65) in acute 2,4,6-trinitrobenzene sulphonic acid (TNBS)-induced colitis in mice as an innovative therapeutic strategy against Crohn's disease (CD). Methods and Results The pXYCYT:Hsp65 plasmid was transformed into theL. lactisNCDO2118 FnBPA+ strain, resulting in theL. lactisNCDO2118 FnBPA+ (pXYCYT:Hsp65) strain. Then, the functionality of the strain was evaluatedin vitrofor Hsp65 production by Western blotting and for invasion into Caco-2 cells. The results demonstrated that the strain was able to produce Hsp65 and efficiently invade eukaryotic cells. Subsequently,in vivo, the anti-inflammatory capacity of the recombinant strain was evaluated in colitis induced with TNBS in BALB/c mice. Oral administration of the recombinant strain was able to attenuated the severity of colitis by mainly reducing IL-12 and IL-17 levels and increasing IL-10 and secretory immunoglobulin A levels. Conclusions TheL. lactisNCDO2118 FnBPA+ (pXYCYT:Hsp65) strain contributed to a reduction in inflammatory damage in experimental CD. Significance and Impact of the Study This study, which usedL. lactisfor the production and delivery of Hsp65, has scientific relevance because it shows the efficacy of this new strategy based on therapeutic protein delivery into mammalian enterocytes.