Kabiri F, Nejati V, Tukmechi A, Delirezh N, Nikbakhsh P,
Volume 68, Issue 12 (3-2011)
Abstract
Background: Lactobacillus species are genetically diverse groups of Lactic Acid
Bacteria (LAB) that have been
introduced as probiotics, because of some characteristics such as their anti-tumor properties, helping the intestinal flora balance, production of
antibiotics, stimulation of host immune response, etc. The aim of this study was to investigate the effects of cytoplasmic extraction and cell wall of
Lactobacillus species isolated from the intestine of common carp on human chronic myelocytic leukemia or K562 cancer cell lines.
Methods: The intestinal contents of 115 common carp captured from the natural resources of West Azerbaijan province in Iran were examined for LAB. After isolation, the identification of Lactobacilli was done according to traditional and molecular bacteriological tests. Subsequently, a suspension of each bacterium was prepared and the protein content of the cytoplasm was extracted. Cell wall disintegration was done by cell lysis buffer and sonication. The effects of cytoplasmic extraction and cell wall on K562 cell line proliferation were investigated by MTT
assays.
Results: The cytoplasmic extraction of the isolated Lactobacilli had significant (p<0.05)
anti-proliferative effects on K562 cells. The cytoplasmic extractions of Lactobacillus paracasei and Lactobacillus casei inhibited K562 cell proliferation by 66.56% and 54.28% at 83.33 μg/ml concentration, respectively.Nevertheless, the Lactobacillus cell wall could not inhibit the proliferations
of K562 cells (p<0.05).
Conclusion: In this study, the cytoplasmic extractions of the isolated Lactobacilli from the
intestine of common carp had anti-proliferative effects on K562cell line.
