Exocellular products from Bifidobacterium adolescentis as immunomodifiers in the lymphoproliferative responses of mouse splenocytes

Anti-proliferative effects of Bifidobacterium adolescentis SPM0212 extract on human colon cancer cell lines

BACKGROUND

Lactic acid bacteria (LAB) are beneficial probiotic organisms that contribute to improved nutrition, microbial balance, and immuno-enhancement of the intestinal tract, as well as anti-tumor activity. The aim of the present work was to study the growth inhibition of tumor cells by butanol extract of Bifidobacterium adolescentis isolated from healthy young Koreans.

METHODS

The anti-proliferative activity of B. adolescentis isolates was assessed by XTT assays on three human colon cancer cell lines (Caco-2, HT-29, and SW480). The effects of B. adolescentis SPM0212 butanol extract on tumor necrosis factor-alpha (TNF-alpha) and nitric oxide (NO) production were tested using the murine macrophage RAW 264.7 cell line.

RESULTS

The butanol extract of B. adolescentis SPM0212 dose-dependently inhibited the growth of Caco-2, HT-29, and SW480 cells by 70%, 30%, and 40%, respectively, at 200 microg/mL. Additionally, the butanol extract of B. adolescentis SPM0212 induced macrophage activation and significantly increased the production of TNF-alpha and NO, which regulate immune modulation and are cytotoxic to tumor cells.

CONCLUSION

The butanol extract of B. adolescentis SPM0212 increased activity of the host immune system and may improve human health by helping to prevent colon cancer as a biological response modifier.

Inhibition of proliferation in colon cancer cell lines and harmful enzyme activity of colon bacteria by Bifidobacterium adolescentis SPM0212

In this study, we assessed the anticancer activity and bacterial enzyme inhibition of Bifidobacterium adolescentis SPM0212. B. adolescentis SPM0212 inhibited the proliferation of three human colon cancer cell lines: HT-29, SW 480, and Caco-2. SPM0212 also dose-dependently inhibited TNF-á production and changes in cellular morphology. B. adolescentis SPM0212 inhibited harmful fecal enzymes, including â-glucuronidase, â-glucosidase, tryptophanase, and urease. Thus, B. adolescentis SPM0212 exerts an anticancer effect and inhibits harmful fecal enzymes.

Enhancement of antigen-specific antibody production by extracellular slime products from slime-forming Lactococcus lactis subspecies cremoris SBT 0495 in mice

The effect of extracellular slime products (ESP) produced by Lactococcus lactis subspecies cremoris SBT 0495 on antigen specific antibody production was studied in mice. ESP contained 48.5% protein, 15.4% neutral sugar, and 1.1% of phosphorus. The optimum dose of ESP was between 100 to 500 micrograms per mouse. ESP administered intraperitoneally (200 micrograms per mouse) enhanced the production of specific antibody in mice. These results indicate that ESP may act as an adjuvant.