The Effect of Lactic Acid Bacteria and Bifidobacteria on the Number of Natural Killer Cells in Normal Conditions and in Cases of Intravaginal Staphylococcosis in Mice

Liudmyla Lazarenko, Lidiia Babenko, Viktoriya Mokrozub, Maria Voronkevich, Daria Loseva, Lubov Sichel, Mykola Spivak


Background. Development of new immunobiotics based on commensal nonpathogenic probiotic bacteria such as lactic acid bacteria and bifidobacteria with antibacterial and immunomodulatory effects is an important area of modern biotechnology.

Оbjective. The aim of this study was to determine the effect of Lactobacillus acidophilus IMV B-7279, L. casei IMV B-7280, L. delbrueckii subsp. bulgaricus ІМV В-7281, Bifidobacterium animalis VKL and B. animalis VKB (individually) or their different compositions on the number of natural killer cells (NKC) in the spleen of BALB/c mice at normal conditions and in the case of the experimental intravaginal staphylococcosis.

Methods. The number of NKC in the spleen was studied using monoclonal phycoerythrin-conjugated antibodies against NKC antigens (MACS, Miltenyi Biotec, Germany). Calculations of NKC as well as analysis of the results were performed using flow cytometry method on a FACStar Plus cytofluorometer.

Results. It is shown that the number of NKC in the spleen of intact mice did not change under the influence of L. acidophilus ІМV В-7279, L. casei ІМV В-7280, B. animalis VKL or B. animalis VKB (individually). But, using L. acido­philus ІМV В-7279, L. casei ІМV В-7280, L. delbrueckii subsp. bulgaricus ІМV В-7281, B. animalis VKL and B. ani­malis VKB (individually) or their different compositions for colonization of the vagina in the case of intravaginal staphylococcosis associated with increasing of the number of NKC in spleen in different periods of observation. The number of NKC in the spleen of staphylococcus-infected mice completely normalized after treatment with some probiotic compositions. The probiotic bacteria (individually) only partially normalized the number of NKC in the spleen of staphylococcus-infected mice.

Conclusions. Thus, L. acidophilus ІМV В-7279, L. casei ІМV В-7280, L. delbrueckii subsp. bulgaricus ІМV В-7281 or B. animalis VKL (individually) or their various compositions are promising to create highly effective immunobiotics, that are able to increase the innate immunity in cases of infections.


Lactic acid bacteria; Bifidobacteria; Natural killer cells; Spleen; Intravaginal staphylococcosis; Mice

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