Cytokine analysis to differentiate immunomodulatory properties of Lactobacillus paracasei strains and for the identification of potentially unsafe strains.

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Cytokine analysis to differentiate immunomodulatory properties of Lactobacillus paracasei strains and for the identification of potentially unsafe strains Angelo Sisto 1, Palmira De Bellis 1, Lucia Treppiccione 2, Paola Lavermicocca 1, Mauro Rossi 2 1 Institute of Sciences of Food Production, CNR, Bari, Italy 2 Institute of Food Sciences, CNR, Avellino, Italy

Holzapfel W.H. et al., Am J Clin Nutr 2001; 73:365S Probiotic strain (As indicated by the manufacturer) Type of product Identification on the basis of DNA analysis L. casei (Actimel)Yogurt drinkL. paracasei L. casei (Shirota)Probiotic drinkL. paracasei L. caseiYogurtL. paracasei L. caseiYogurtL. paracasei Nevertheless, it is noteworthy that same L. paracasei strains have been associated with cases of infective endocarditis. Oakey H.J. et al., J App Bacteriol 1995; 78:142 Daniel C. et al., App Environ Microbiol 2006; 72:5799 Vankerckhoven V. et al., J Med Microbiol 2007; 56:1017 Lactobacillus paracasei is generally recognized as a safe species and L. paracasei strains are frequently present in fermented food products and also used as probiotic strains.

Comparison of genetically characterized Lactobacillus paracasei strains to reveal their immunomodulatory properties and the potential relationship between the immune response and their different behaviors. To ascertain if immunological tests can be useful to predict peculiar probiotic aptitudes and the safety of a new proposed probiotic strain. Aim of the study Therefore, bacterial strains were characterized by using the fAFLP technique and their ability to modulate the immune response of mouse dendritic cells (DCs) was evaluated.

SpeciesStrainsRelevant characteristics L. paracasei IMPC 2.1 (LMG P-22043) Probiotic strain, isolated from human intestine LMG P Probiotic strain, isolated from human intestine IMPC 4.1 Isolated from human intestine LMG Unsafe strain, Isolated from human blood of a patient with infective endocarditis. The strain is also capable of exacerbating colitis in mice and of translocation to extra- intestinal organs ATCC 334 Reference strain, isolated from dairy product ISPA 882 Isolated from processed meat ISPA 1040 Isolated from dairy product ATCC Isolated from human saliva B44f3t (ISPA 960) Isolated from dairy product B8S (ISPA 613) Isolated from dairy product L. casei ATCC 393 Reference strain, Isolated from dairy product Bacterial strains used in this study

Molecular characterization by fAFLP analysis IMPC 2.1 (273) ISPA 882 (254) LMG P (244) LMG (251) IMPC 4.1 (265) ATCC (241) ISPA 960 (240) ISPA 1040 (236) ISPA 613 (237) ATCC 334 (239) ATCC 393 (231) sDsD L. paracasei L. casei Strains N. of DNA fragments

Evaluation of bacterial immunomodulotory properties BALB/c mice LPS immature dedritic cells (iDC) mature dedritic cells (mDC) Treatment with L. paracasei strains Effect on DC maturation: CD11c, CD40, CD80, CD86 Effect on cytokine production: TNF-α, IL-2, IL-10, IL-12

DCs alone + LPS IMPC 2.1 ATCC 334 LMG LMG P IMPC 4.1 CD11c % of Max CD % of Max DCs alone + LPS IMPC 2.1 ATCC 334 LMG LMG P IMPC 4.1 DCs alone + LPS IMPC 2.1 ATCC 334 LMG LMG P IMPC 4.1 % of Max DCs alone + LPS IMPC 2.1 ATCC 334 LMG LMG P IMPC 4.1 CD80 Effects of L. paracasei strains on the maturation of mice bone-marrow DCs All strains increased the surface expressions of CD11c and CD80, but not of CD40, in iDCs at levels comparable with LPS stimulation.

% of Max DCs alone + LPS IMPC 2.1 ATCC 334 LMG LMG P IMPC 4.1 CD86 Surface expression of CD86, following incubation with bacterial strains, was even higher than the expression caused by LPS stimulation. Up-regulation of CD86 is consistent with other studies in which probiotic Lactobacillus species caused a similar enhancement.

Effect of Lactobacillus paracasei strains on cytokine production by dendritic cells (DCs) TNF- α no LPS + LPS

IL-2 + LPSno LPS

IL-12 + LPSno LPS

IL-10 + LPSno LPS

Conclusions  Our results confirm that each single strain of a bacterial species appears to influence the immune system in a peculiar manner: strain IMPC 4.1 showed an interesting anti-inflammatory ability (high IL-10/IL-12); probiotic strains IMPC 2.1 and LMG P were characterized by a similar and intermediate ability to induce cytokine secretion in contrast to the very low ability of strain LMG to stimulate production of IL-10 and IL-12.  The evaluation of the different types and⁄or levels of cytokines whose secretion is induced by each strain could be relevant to define its pro- or anti-inflammatory properties and its more appropriate clinical use.

 Our results suggest that cytokine (IL-10, IL-12) pattern analysis of DCs stimulated with bacterial cells can be considered as an useful in vitro method to predict potentially unsafe features of new proposed probiotic strains before embarking on time- consuming clinical studies. In fact, in this regard, the unsafe strain LMG was clearly differentiated from the other L. paracasei strains and its low ability to stimulate IL-10 and IL-12 production could explain the ability of the strain to cross the intestinal mucosal barrier and ⁄ or persist in the extra-intestinal organs or circulation.