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Novel strain of lactobacillus mucosae

A technology of Lactobacillus mucosae, strains, applied in the direction of bacteria, microorganism-based methods, resistance to vector-borne diseases, etc., can solve problems such as the impact of intestinal barrier function

Active Publication Date: 2014-09-17
DANONE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] To date, no strains of mucosal Lactobacillus species have been reported to have an effect on intestinal barrier function

Method used

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  • Novel strain of lactobacillus mucosae
  • Novel strain of lactobacillus mucosae
  • Novel strain of lactobacillus mucosae

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]Example 1 - Morphology and fermentation properties of Lactobacillus mucosal strain CNCM I-4429

[0028] form

[0029] Electron microscope images of strain CNCM I-4429 are shown in figure 1 . Strain CNCM 1-4429 exhibited a distorted shape; it is a distorted rod-shaped bacterium.

[0030] Analysis of carbohydrate metabolism:

[0031] Sugar fermentation assays were performed on a Bioscreen instrument (Oy Growth Curves Ab Ltd). Twenty-one sugars were selected for analysis. List them in Table I.

[0032] The analysis with the Bioscreen lasted 24 hours, with measurements taken every 20 minutes after 10 seconds of shaking. Two analyzes were performed in triplicate each. To avoid the inhibitory effect of glucose by catabolites, a medium with galactose was used for the preculture.

[0033] - pre-medium MRS-galactose;

[0034] - Medium, MRS containing 1% sugar to be tested

[0035] - In each well; 300 μL of culture medium and 1% pre-medium

[0036] -During the 24h perio...

Embodiment 2

[0044] Example 2 - Mucus-binding properties of Lactobacillus mucosal strain CNCM 1-4429

[0045] Adhesion to mucin:

[0046] The analysis of adhesion to mucin (Sigma Aldrich) from porosin gastrotype II was performed by 2 protocols "static" and "dynamic" to study biofilm formation.

[0047] The first and last steps of the preparation are the same for both protocols. Mucin was dissolved in PBS pH 7 at a concentration of 20 mg / ml, and then heat-sterilized glass spheres (6 mm in diameter) were submerged in the mucin solution, incubated at 37°C for 1 hour, and then placed at 4°C overnight. The next day the spheroids were washed twice in pH 7 PBS.

[0048] For the "static" protocol, spheroids were submerged in 1 ml of an overnight culture of mucosal Lactobacillus grown in MRS+glucose / MRS+ribose and incubated at 37°C for 4 h, while in the dynamic model, each strain was inoculated before starting Incubate with glass balls at 37°C for 1h.

[0049] The dynamic model used to study bi...

Embodiment 3

[0066] Example 3 - Antimicrobial activity of Lactobacillus mucosal strain CNCM 1-4429

[0067] The "overlay" method described in literature (CHARTERIS et al., J Food Prot, 61, 1636-43, 1998; TOMINAGA & HATAKEYAMA, Appl Environ Microbiol, 72, 1141-7, 2006) was used for testing.

[0068] Cultures of Lactobacillus mucosal CNCMI-4429 cultured for 11 h, 18 h and 48 h in glucose-containing medium were centrifuged and the acidic pH (~pH4) of the supernatant was adjusted to pH 6.5 with 2M NaOH. In this way the lactic acid is neutralized and dissociated to remove its toxicity. "Coverage" tests were performed on plates. The medium used was Soft Brain Heart Infusion-BHI (Difco) (0.7% agar), inoculated with an overnight culture of Salmonella. When the surface of the inoculated medium was dry, four holes with a diameter of 5 mm were punched in each plate. Then, 80 μl of cell-free supernatants of Lactobacillus mucosae (pH-adjusted and pH-unadjusted for control) were placed in each well. ...

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Abstract

The invention relates to a new strain of Lactobacillus mucosae which is able to decrease intestinal barrier permeability. This strain is useful in particular for alleviating intestinal barrier dysfunctions.

Description

technical field [0001] The present invention relates to novel strains of Lactobacillus mucosae and their use, especially for alleviating intestinal barrier dysfunction. Background technique [0002] The intestinal epithelium acts as a defensive barrier to protect the mucosal surface against the luminal contents and the external environment. [0003] The intestinal epithelial layer has a low level of permeability due to the presence of tight junctions (TJs) between cells. Tight junctions are complexes between cells that function as a barrier to limit the transfer of substances from the intestinal lumen to the intestinal mucosa. Disruption of these complexes can be induced by external factors such as some enteric pathogens or by pro-inflammatory cytokines, including TNF-α and IFN-γ, among others; this results in increased paracellular permeability of epithelial cells, which contributes to Various bowel disorders including, inter alia, irritable bowel syndrome, chronic inflam...

Claims

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Application Information

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IPC IPC(8): C12N1/20A23L1/30A61K35/74A61P1/00C12R1/225
CPCA61K35/00C12R1/225C12N1/20A61K35/744A23L1/3014C12N15/746A23L33/135A61P1/00A61P1/12Y02A50/30C12R2001/225C12N1/205A61K35/747
Inventor 塔玛拉·什莫克维纳玛丽-克里斯蒂娜·德吉弗里
Owner DANONE
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