Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K35/00—Medicinal preparations containing materials or reaction products thereof with undetermined constitution
  • A61K35/66—Microorganisms or materials therefrom
  • A61K35/74—Bacteria
• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
  • A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
  • A23L33/10—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
  • A23L33/135—Bacteria or derivatives thereof, e.g. probiotics
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K35/00—Medicinal preparations containing materials or reaction products thereof with undetermined constitution
  • A61K35/66—Microorganisms or materials therefrom
  • A61K35/74—Bacteria
  • A61K35/741—Probiotics
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
• • C—CHEMISTRY; METALLURGY
  • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
  • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
  • C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
  • C12N1/20—Bacteria; Culture media therefor
  • C12N1/205—Bacterial isolates
• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
  • A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
  • A23V2200/00—Function of food ingredients
  • A23V2200/30—Foods, ingredients or supplements having a functional effect on health
  • A23V2200/32—Foods, ingredients or supplements having a functional effect on health having an effect on the health of the digestive tract
• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
  • A23V2200/00—Function of food ingredients
  • A23V2200/30—Foods, ingredients or supplements having a functional effect on health
  • A23V2200/32—Foods, ingredients or supplements having a functional effect on health having an effect on the health of the digestive tract
  • A23V2200/3204—Probiotics, living bacteria to be ingested for action in the digestive tract
• • C—CHEMISTRY; METALLURGY
  • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
  • C12R—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
  • C12R2001/00—Microorganisms ; Processes using microorganisms
  • C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales

Definitions

• the present invention relates to a strain of Faecalibacterium prausnitzii for use in the treatment and prevention of inflammatory gastrointestinal diseases (IBD) in an individual, particularly inflammatory bowel disease (IBD).
• IBD inflammatory gastrointestinal diseases
• Inflammation is a natural biological process that is a normal part of the response to injury or infection and helps protect the body against internal or external aggression.
• dysfunctional mechanisms of inflammation can cause painful and life-threatening conditions.
• diseases include, for example, skin disorders, intestinal disorders, neurological disorders, arthritis and autoimmune diseases. Many of these inflammatory diseases remain without treatment or adequate treatment.
• Inflammatory bowel disease is a group of disorders characterized by chronic and recurrent inflammation of the gastrointestinal tract. The most common form of this group is Crohn's disease.
• the pathogenesis implements an inappropriate and continuous activation of the mucosal immune system caused by the presence of the intestinal microbiota in a genetically predisposed patient.
• the object of the present invention is to describe novel substances, in particular probiotics, and compositions for the treatment and / or prevention of inflammatory gastrointestinal diseases in an individual, particularly inflammatory bowel diseases in an individual.
• prevent means the reduction to a lesser degree of the risk or probability of occurrence of a given phenomenon, i.e., in the present invention, an inflammation.
• gastrointestinal especially intestinal inflammation.
• the present invention is based on the discovery by the present inventors of the anti-inflammatory properties of the strain of Faecalibacterium prausnitzii deposited with the CNCM under accession number CNCM 1-4573.
• a specific strain of Faecalibacterium prausnitzii (F. prausnitzii) deposited with the CNCM on January 21, 2012 under accession number CNCM 1-4573 has the unexpected ability to reduce in vitro and in vivo inflammation. gastrointestinal tract, particularly intestinal inflammation, in an individual. As illustrated in the examples and described below, the inventors have demonstrated that, on the other hand, the F. prausnitzii 1-4575 strain does not have such advantageous properties.
• the strain according to the invention is more particularly capable of reducing the production of pro-inflammatory molecules, such as interleukin-8 (IL-8), interleukin-2 (IL-2), interleukin-4 (IL-4). ), interleukin 6 (IL-6) and gamma interferon (INFy), and increase the production of anti-inflammatory molecules, such as interleukin 10 (IL-10).
• pro-inflammatory molecules such as interleukin-8 (IL-8), interleukin-2 (IL-2), interleukin-4 (IL-4).
• IL-6 interleukin 6
• IFNy gamma interferon
• the present invention relates to a bacterial strain of the species Faecalibacterium prausnitzii deposited with the CNCM under the accession number CNCM 1-4573, for its use in the treatment and / or prevention of gastrointestinal disease.
• Inflammatory bowel disease in an individual particularly inflammatory bowel disease in an individual, more particularly an inflammatory bowel disease in an individual.
• This strain identified by the inventors is therefore a probiotic strain that can be used for the applications indicated above.
• An individual according to the invention is preferably a mammal, including a non-human mammal, and is, in particular, a human.
• Inflammatory gastrointestinal disease is, in particular, an inflammatory bowel disease (IBD), more particularly an intestinal inflammatory bowel disease.
• IBD inflammatory bowel disease
• Said intestinal inflammatory bowel disease may, in particular, be selected from the group consisting of Crohn's disease, ulcerative colitis and pouchitis, in particular Crohn's disease and ulcerative colitis.
• the bacterial strain for its use according to the invention is comprised in a composition comprising a physiologically acceptable medium, preferably in an oral composition, and more particularly preferably in a food supplement.
• physiologically acceptable medium is intended to mean a medium that is compatible with the organism of the individual to whom said composition is to be administered. It may be, for example, a non-toxic solvent such as water. In particular, said medium is compatible with oral administration.
• a composition of the invention is preferably for the oral route.
• a composition of the invention for the oral route may be selected from the group consisting of a food product, a beverage, a pharmaceutical, a nutraceutical, a food additive, a dietary supplement and a dairy product and is, in particular, in the form of a dietary supplement.
• Figure 1 illustrates the concentration of interleukin-8 (IL-8) (in ⁇ g IL-8 / mg protein) in TNF ⁇ -stimulated Ht-29 cells: (a) only in YBHI medium (control); (b) treated with F. prausnitzii strain A2-165; (c) treated with the 1-4573 strain of F. prausnitzii according to the invention; or (d) treated with F. prausnitzii strain 1-4575. Trials are conducted in triplicate. The results are normalized using, as a reference value, IL-8 produced after co-induction with PBS as a negative control. * P ⁇ 0.05.
• IL-8 interleukin-8
• Figure 2 illustrates the concentration of interleukin 10 (IL-10) (in ⁇ g of IL-10 / ml of protein) in peripheral blood mononuclear cells (PBMC): (a) only in YBHI medium (control); (b) treated with F. prausnitzii strain A2-165; (c) treated with the 1-4573 strain of F. prausnitzii according to the invention; or (d) treated with F. prausnitzii strain 1-4575. Trials are performed in triplicate. *** P ⁇ 0.001.
• IL-10 interleukin 10
• FIG 3 illustrates the experimental protocol for the model of chronic colitis in mice (DNBS).
• Figure 4 illustrates the macroscopic scores of the colon and small intestine (a) of control mice (without colitis) receiving only EtOH; (b) control mice with DNBS colitis and treated with PBS; (c) mice with DNBS colitis treated with F. prausnitzii strain A2-165; (d) mice with DNBS colitis treated with F. prausnitzii strain 1-4573; and (e) mice with DNBS colitis treated with F. prausnitzii strain 1-4575.
• Macroscopic criteria (evaluated on a scale of 0 (without damage) to 9) include macroscopic mucosal damage (such as ulcers, thickening of the colon wall, presence of adhesions between the colon and other organs). intra-abdominal), the consistency of feces (as an indicator of diarrhea) and the presence of hyperemia.
• n 8. ** p ⁇ 0.01.
• Figure 6 illustrates the concentrations of colonic cytokines (( Figure 6A) IL-2, ( Figure 6B) IL-4 ( Figure 6C) IL-6 and ( Figure 6D) IFNg) (in ⁇ g / ml)
• Figure 6 illustrates the concentrations of colonic cytokines (( Figure 6A) IL-2, ( Figure 6B) IL-4 ( Figure 6C) IL-6 and ( Figure 6D) IFNg) (in ⁇ g / ml)
• the present inventors have conducted extensive work to identify the ability of a specific strain of Faecalibacterium prausnitzii to treat and / or prevent inflammatory gastrointestinal disease in an individual, particularly inflammatory bowel disease, in an individual.
• the inventors have unexpectedly determined that the strain of F. prausnitzii 1-4573 has the ability to reduce gastrointestinal inflammation, particularly intestinal inflammation, in an individual.
• the bacterial strain of the invention may, in particular, reduce the concentration of pro-inflammatory molecules, such as interleukin 8 (IL-8), interleukin 2 (IL-2), interleukin 4 (IL-4) and interleukin 6 (IL-6).
• pro-inflammatory molecules such as interleukin 8 (IL-8), interleukin 2 (IL-2), interleukin 4 (IL-4) and interleukin 6 (IL-6).
• the bacterial strain of the invention is, in particular, capable of increasing the concentration of anti-inflammatory molecules, such as interleukin 10 (IL-10).
• IL-10 interleukin 10
• F. prausnitzii is a major member of the Firmicutes phylum and is one of the most abundant commensal bacteria in the microbiota of the human large intestine.
• F. prausnitzii is an extremely sensitive oxygen (EOS) bacterium and is therefore difficult to cultivate, even under anaerobic conditions (Duncan et al., 2002, Int.
• F. prausnitzii is, in particular, known to be one of the most abundant butyrate-producing bacteria in the human gastrointestinal tract, the short chain butyrate fatty acid being very important in gut physiology, systemic functions and benefits for human health (Macfarlane et al.
• F. prausnitzii strain A2-165 is also known to have anti-inflammatory and protective effects in murine models of acute and chronic colitis, i.e., in inflammatory disorders (Martin et al., Inflamm Bowel Dis.
• strain A2-165 can not generally be attributed to F. prausnitz, since the existence of anti-inflammatory properties is unpredictable for a given F. prausnitzii strain. Indeed, such specific anti-inflammatory activity is illustrated in the examples, in which a comparative test was conducted with a strain of F. prausnitzii not forming part of the invention, namely the CNCM 1-4575 strain, which does not possess the anti-inflammatory activity of the strain of the invention.
• a suitable daily dose of a bacterial strain according to the invention is from 10 7 to 10 11 colony-forming units (cfu) as a drug, for example in the form of a daily dose equivalent to 10 9 cfu.
• a strain of Faecalibacterium prausnitzii of the invention is for use in the treatment and / or prevention of gastrointestinal inflammation in an individual, particularly inflammation of the intestine in an individual.
• the strain of the invention is a probiotic whose activity is located in the intestine.
• a probiotic bacterium according to the invention denotes a bacterium which, when it is ingested in sufficient quantities, can have beneficial effects on human health.
• this strain must be administered live to the intestine.
• the bacterial strain of the invention can be administered to the intestine of an individual to be treated in different ways, namely orally or rectally.
• a bacterium according to the invention is preferably administered orally.
• the bacterial strain of the invention is comprised in a composition comprising a physiologically acceptable medium.
• a composition is preferably for the oral route, and in particular in the form of a dietary supplement.
• the present invention further relates to a composition
• a composition comprising, in a physiologically acceptable medium, at least the bacterial strain of Faecalibacterium prausnitzii 1-4573 of the invention.
• a composition according to the invention is provided for the digestive tract, in particular the intestine.
• composition according to the invention is selected from an oral or rectal composition.
• a composition of the invention is preferably an oral or rectal composition, more preferably an oral composition.
• a composition of the invention is an oral composition, that is to say that it is intended for oral administration to a subject.
• Such a composition may be in the form of a suspension, a tablet, a pill, a capsule, a granule or a powder.
• composition according to the invention for the oral route may be chosen from the group consisting of a food product, a beverage, a pharmaceutical product, a nutraceutical, a food additive, a food supplement or a dairy product, and is, in particular , a food supplement.
• a composition according to the invention is a dietary supplement.
• a dietary supplement for oral administration may be present in capsules, capsules, soft capsules, tablets, coated tablets, pills, pastes, lozenges, gums, oral solutions or emulsions, syrup or gel.
• a composition according to the invention may be provided with a coating resistant to gastric juice, to ensure that the bacterial strain of the invention included in said composition can pass through the damaged stomach. The release of the bacterial strain can thus occur for the first time in the upper intestinal tract.
• a dietary supplement according to the invention may further comprise a sweetener, a stabilizer, an antioxidant, an additive, a flavoring agent and / or a dye.
• the formulation thereof is carried out by the usual methods for producing coated tablets, capsules, gels, controlled release hydrogels, emulsions, tablets or capsules.
• a composition according to the invention may also be in the form of a nutritional composition.
• a nutritional composition according to the invention is in the form of a yogurt, a cereal bar, cereals for breakfast, a dessert, a frozen food, a soup, a pet food, a liquid suspension, a powder, a tablet, a gum or a candy.
• composition containing the bacterial strain of the invention is administered intrarectally.
• rectal administration is conducted in the form of a suppository, enema or foam.
• composition of the invention is suitable for administering a daily dose of from 10 7 to 10 11 colony-forming units (cfu) as a drug, preferably a daily dose equivalent to 10 9 cfu.
• composition according to the invention may be administered to an individual in need at a single daily dose of 1 g containing the bacterial strain 1-4573 of the invention in an amount equivalent to a dose of between 10 7 and 10 g. 11 cfu, preferably 10 9 cfu.
• composition according to the invention can be administered to an individual in need at a single daily dose of 0.2 g containing the bacterial strain 1-4573 of the invention in an amount equivalent to an amount between 10 7 and 10 11 cfu, preferably 10 9 cFU.
• a composition according to the invention may be administered to an individual in need thereof twice daily on the basis of two doses of 1 g, each dose containing, independently, the bacterial strain 1-4573 of the invention. in an amount equivalent to between 5 ⁇ 10 6 and 5 ⁇ 10 10 cfu (based on dry weight), preferably 5 ⁇ 10 8 cfu, so that the total daily dose of 1-4573 bacterial strain of the invention administered to the individual be as indicated above.
• a composition according to the invention may furthermore comprise at least one of: antioxidants, fish oils, DHA, EPA, vitamins, minerals, phytonutrients, a protein, a lipid, probiotics and combinations of them.
• the strain of F. prausnitzii according to the invention deposited with the CNCM under accession number CNCM 1-4573 was tested and compared with two other strains of F. prausnitzii, A2-165 and CNCM 1-4575, for its ability to modulate in vitro and in vivo immune response and to have a direct impact on intestinal inflammation.
• HT-29 In vitro assays, two different cell models are used: HT-29 and PBMC.
• the isolates of the F. prausnitzii strains tested are grown in medium
• YBHI brain-heart perfusion medium supplemented with 0.5% yeast extract
• 1 mg / ml cellobiose Sigma-Aldrich Chemie Gmbh, Buchs, Switzerland
• 1 mg / ml of maltose Sigma-Aldrich
• 0.5 mg / ml of cysteine Sigma-Aldrich
• the strains are isolated from healthy patients:
• the HT-29 (ATCC HTB-38) cell line (LGC-Standars) is cultured in Dulbecco's Minimalized Minimal Eagle Essential Medium (DMEM) (Sigma-Aldrich) supplemented with 10% (w / v) fetal bovine serum ( FBS) inactivated by heat (GibcoBRL, Eragny, France) and penicillin G / streptomycin (5000 IU / ml, 5000 ⁇ / ⁇ 1) (Sigma-Aldrich). The cultures are incubated in 25 cm 2 tissue culture flasks (Nunc, Roskilde, Denmark) at 37 ° C in a 5% (v / v) C0 2 atmosphere until confluent.
• DMEM Dulbecco's Minimalized Minimal Eagle Essential Medium
• FBS fetal bovine serum
• penicillin G / streptomycin 5000 IU / ml, 5000 ⁇ / ⁇ 1
• Anti-inflammatory tests using HT-29 are conducted according to the procedure described by Kechaou et al. (Applied and environmental microbiology 2012, 79 (5): 1491-1499).
• HT-29 cells per well are seeded in 24-well culture plates (Nunc). Twenty-four hours before bacterial stimulation, the culture medium is replaced by a medium with 5% FBS.
• the tests begin at day 7 after seeding, when the cells are at confluence (1.83X10 6 cells / well). Twenty-four hours before bacterial co-culture (day 6), the culture medium is replaced by a medium with 5% FBS inactivated by heat and 1% glutamine.
• IL-8 interleukin-8
• Total proteins are determined using the Bradford reagent test (Sigma-Aldrich). The tests are conducted at least in triplicate.
• results are expressed as IL-8 / protein ( ⁇ g / mg) and are normalized using IL-8 produced as a reference value after co-incubation with PBS as a negative control.
• CNCM 1-4573 strain is capable of significantly reducing pro-inflammatory IL-8 cytokine production induced by TNF- ⁇ stimulation in HT-29 epithelial cells.
• F. prausnitzii strain A2-165 also produces such a reduction in IL-8 production.
• PBMCs StemCell Technologies, France
• Donors have the following characteristics: men, less than 65 years of age, body mass index ⁇ 30, no smoker, no drugs with known anti-inflammatory effects taken in the 15 days prior to selection, and negative test for HIV, hepatitis A and hepatitis B.
• the cells After reception, the cells are stored in liquid nitrogen until use.
• PBMCs for co-culture assays with F. prausnitzii bacteria
• the flasks are thawed at 37 ° C in a water bath and then transferred to media containing RPMI-1640 medium supplemented with 10% FCS inactivated. by heat, 1% L-glutamine and 0.1% penicillin / streptavidin (the middle components are purchased in Lonza, Switzerland).
• DNase 100 ⁇ g / ml, Roche Applied Science, France
• the cells are then centrifuged at 200 g for 15 min, counted using trypan blue and plated on 24 well plates at 1x10 6 cells / well. Supernatants are added in triplicate (three wells per donor) at 10% in a total volume of 1 ml. The plates are incubated for 24 h at 37 ° C with 10% C0 2 .
• the culture supernatants are collected, mixed with an anti-protease cocktail according to the manufacturer's instructions (EDTA-complete protease inhibitor, Roche Applied Bioscience) and stored at -80 ° C until further analysis of interleukin-10 concentrations ( IL-10) by ELISA (Mabtech, Sweden).
• EDTA-complete protease inhibitor Roche Applied Bioscience
• CNCM 1-4573 strain is capable of significantly increasing the production of IL-10 anti-inflammatory cytokine in PBMCs.
• F. prausnitzii strain A2-165 also produces such an increase in IL-10 production.
• mice are anesthetized with enflurane (Abbott, Abbott Park, IL) and a 10 cm long segment of PE-90 tubing (ClayAdam, Parsippany, NJ) is attached to a tuberculin syringe and inserted at 3 , 5 cm in the colon.
• Colitis is induced by intrarectal (ir) injection via this tube of 200 mg / kg DiNitroBenzene-Sulfonic Acid (DNBS) solution (ICN, Biomedical Inc.) in 30% ethanol (EtOH) .
• DNBS DiNitroBenzene-Sulfonic Acid
• mice are fed with 6% sucrose in drinking water for the first 3 days after the injection of DNBS to prevent dehydration (DNBS period).
• 10 days after the DNBS period 200 ⁇ containing 1 ⁇ 10 9 CFU of one of the bacterial strains are administered intragastrically, each day for 10 days (gavage period) (see Figure 3).
• the study groups are as follows: non-colitis control group (EtOH + PBS), control group colitis (DNBS + PBS), strain group of F. prausnitzii A2-165 (DNBS + A2- 165), F. prausnitzii CNCM-I4573 (DNBS + CNCM-I4573) and F. prausnitzii CNCM-I4575 (DNBS + CNCM-I4575).
• the colitis is reactivated 21 days after the first injection of DNBS (recovery period) with a second injection of 100 mg / kg of DNBS solution.
• the severity of the colitis is then determined by monitoring the weight loss (results not shown) during the 3 days following the second injection.
• mice are sacrificed by cervical dislocation and the abdominal cavity is opened.
• the colon and small intestine are removed and opened longitudinally; macroscopic damage is evaluated immediately.
• Macroscopic scores are recorded using a previously described system for DNBS colitis.
• the macroscopic criteria include macroscopic mucosal damage (such as ulcers, thickening of the colon wall, presence of adhesions between the colon and other intra-organ organs). abdominal), the consistency of feces (as an indicator of diarrhea) and the presence of hyperemia. The results obtained are shown in FIG.
• MPO Myeloperoxidase activity
• MPO myeloperoxidase
• a 1 cm length of distal colon is recovered and homogenized (50 mg / ml) in ice-cold 50 mM potassium phosphate buffer (pH 6) containing 5% hexadecyltrimethylammonium bromide (Sigma-Aldrich) and peroxide. hydrogen (H 2 O 2 ).
• the colorimetric reaction is monitored by measuring the absorbance with a spectrophotometer.
• a length of one centimeter of distal colon is recovered and homogenized in 400 ⁇ l of Tris-HCl buffer containing protease inhibitors (Sigma-Aldrich) in a tissue lyser.
• the samples are centrifuged for 20 min and the supernatant is frozen at
• the blood samples Prior to sacrifice, the blood samples are obtained from the retro-orbital venous plexus and centrifuged, and the sera are stored at -80 ° C until analysis.
• the pro-inflammatory cytokines (IL-6, IL-4, IFN-gamma, and IL-2) are assayed at least one cytometric ball array system (BD, NJ, USA).
• a p-value less than 0.05 is considered significant.
• the scores obtained with DNBS mice treated with the strain A2-165 or the strain 1-4575 are higher on the scale of the macroscopic criteria than those obtained with the control mice having no colitis and the treated DNBS mice. with strain 1-4573.
• the expression levels of IL-2 and IL-4 are similar to those obtained with control mice lacking colitis.
• the expression levels of IFN- ⁇ and IL-6 are more reduced compared with those obtained with the untreated control DNBS mice.
• strain 1-4575 has no anti-inflammatory property. Its expression levels of IL-2, IL-4, IL-6 and IFN- ⁇ are similar, or even higher, than those observed with untreated control DNBS mice.
• the F. prausnitzii 1-7573 strain advantageously exhibits anti-inflammatory properties and that not all F. prausnitzii strains have such properties, as demonstrated with strain 1-4575.

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