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Journal of Dairy Science Vol. 70 No. 5 919-926
© 1987 by American Dairy Science Association ®
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Enhancement of Immune Response in Mice Fed with Streptococcus thermophilus and Lactobacillus acidophilus

G. Perdigon, M. E. Nader de Macias, S. Alvarez, G. Oliver and A. A. Pesce de Ruiz Holgado

Centra de Referenda para Lactobacilos (CERELA), Chacabuco 145, Tucumán, Argentina and Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Argentina

ABSTRACT

Swiss mice, fed for 8 consecutive d with 50 µg/d of viable cultures of Lactobacillus acidophilus and Streptococcus thermophilus, showed significant variation in their immune system. In order to study this phenomenon assays for macrophage and lymphocyte function were carried out. Both lactic acid bacteria enhanced significantly the enzymatic and phagocytic activity of peritoneal macrophages as checked against the controls and also accelerated the phagocytic function of the reticuloendothelial system as revealed by the carbon clearance test. On the 2nd d (100 µg), L. acidophilus reached a peak of K = .271, which remained high. Streptococcus thermophilus was effective only on the 2nd d and then decreased. The lymphocytic activity studied by immunoglobulin secreting cells was assayed by Jerne's method of plaque-forming cells (PFC). This activity also was increased by the two microorganisms. Streptococcus thermophilus proved more effective than L. acidophilus. Lactobacillus acidophilus and S. thermophilus activated macrophages and lymphocytes and produced the same increase in the immune response of mice whether administered orally or intraperitoneally.






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Copyright © 1987 by the American Dairy Science Association ®.