Patent Application
20150374763
The invention relates to acetylcholine-producing microorganisms for use in the prevention and/or treatment of intestinal diseases, and/or reduction of risks of intestinal diseases, and/or improvement of intestinal health as well as promoting healthy gut flora. The acetylcholine-producing microorganisms may be provided as a pharmaceutical dosage form or as additive to functional food or food supplemental products. Also encompassed is a method for the production of acetylcholine by use of Lactobacilli. Further the invention refers to microbially produced acetylcholine for use in the treatment and/or prevention of intestinal diseases.
A large number of patients suffer from gastrointestinal disorders associated with the lower small bowel and/or large bowel. These disorders include irritable bowel syndrome (IBS), or spastic colon, idiopathic alterative colitis, mucous colitis, collagenous colitis, Crohn's disease, inflammatory bowel disease in general, microscopic colitis, antibiotic-associated colitis, idiopathic or simple constipation, diverticular disease, and AIDS enteropathy.
Irritable bowel syndrome is the most common of all gastrointestinal disorders, affecting 11-14% of adults and accounting for more than 50% of all patients with digestive complaints. (G. Triadafilopoulos et al., Bowel Dysfunction in fibromyalgia, Digestive Dis., Sci. 36 (1): 59-64 [1991]; W. G. Thompson, Irritable Bowel Syndrom: Pathogenesis and Management, Lancet, 341:1569-1572 [1993]). It is thought that only a minority of people with IBS actually seek medical treatment. Patients with IBS present with disparate symptoms, for example, abdominal pain, predominantly related to defecation, alternating diarrhea and constipation, abdominal distention, gas, and excessive mucus in the stool. There are three groups of IBS: constipation-predominant IBS (C-IBS), alternating IBS (A-IBS) and diarrhea-predominant IBS (D-IBS). IBS is recognized as a chronic condition, which may have profound effect on the patient's quality of life.
A number of possible causes for IBS have been proposed such as fiber-poor Western diet, intestinal motility malfunction, abdominal pain perception, abnormal psychology or behavior, or psycho-physiological response to stress. However, none of those causes has been fully accepted (W. G. Thompson [1993] supra).
Patients suffering from IBS appear to perceive normal intestinal activity as painful. For example, IBS patients experience pain at lower volumes of rectal distention than normal or have lower than normal threshold for perceiving migrating motor complex phase III activity (W. E. Whitehead et al., Tolerance for Rectosigmoid Distention in Irritable Bowel Syndrom, Gasteroenterol. 98:1187-92 [1990]; J. E. Kellow et al., Enhanced Perception of Physiological Intestinal Motility in the Irritable Bowel Syndrom, Gasteroenterol. 101 (6):1621-24 [1991]).
Bowel motility in IBS patients differs from a normal controlled response to various stimuli such as drugs, hormones, food, and emotional stress (D. G. Wangel and D. J. Deller, Intestinal Motility in Man, III: Mechanisms of Constipation and Diarrhea with Particular Reference to the Irritable Bowel, Gasteroenterol. 48: 69-84 [1965]; R. F. Harvey and A. E. Read, Effect of Cholecystokinin and Colon Motility and on Symptoms of Patients with Irritable Bowel Syndrome, Lancet i: 1-3 [1973]; R. M. Valori et al., Effects on Different Types of Stress and “Prokinetic drugs” on the Control of the Fasting Motor Complex in Humans, Gasteroenterol. 90: 1890-900 [1986]).
Evans at al. and Govath and Farthing recognized that irritable bowel syndrome is frequently associated with disordered gastro-intestinal motility. (P. R. Evans et al., Gastroparesis and Small Bowel Dysmotility in Irritable Bowel Syndrome, Dig. Dis. Sci. 42 (10): 2087-93[1997]; D. A. Gorard and M. J. Farthing, Intestinal Motor Function in Irritable Bowel Syndrome, Dig. Dis. 12 (2): 72-84[1994]). Treatment directed to bowel dysmotility in IBS includes the use of serotonine antagonists (D. P. Becker et al., Mesoazacyclic Aromatic Acid Amides And Esters as Serotonergic Agents, U.S. Pat. No. 5,612,366; M. Ohta at al., Methods for Treatment of Intestinal Diseases, U.S. Pat. No. 5,547,961) and Choleocytokinin antagonists (Y. Sato et al., Benzodiazepine derivatives, U.S. Pat. No. 4,970,207; H. Kitajima et al., Thienylazole Compound and Thienotriazolodiazepine Compound, U.S. Pat. No. 5,760,032). Colonic motility index, altered myoelectrical activity in the colon and small intestinal dysmotility, however, have not proven to be reliable diagnostic tools because they are not IBS-specific (W. G. Thomson[1993], supra).
Administration of probiotics for the treatment of IBS has been attempted. For example, Allan at al. described the use of a strain of Enterococcus faecium to alleviate symptoms. (W. D. Allan at al., Probiotic Containing Enterococcus faecium strain NCIMB 40371 U.S. Pat. No. 5,728,380 and Probiotic, U.S. Pat. No. 5,589,168). Borody taught a method of treating irritable bowel syndrome by at least partial removal of the intestinal microflora by lavage and replacement with a new bacteria community introduced by fecal inoculum from a disease-screened human donor or by a composition comprising Bacterioids and Escherichia coli species. (T. J. Borody, Treatment of Gastro-Intestinal Disorders with a Fecal Composition of Bacterioids and E. coli, U.S. Pat. No. 5,443,826).
It is a contention of many scientists that the health and well-being of people can be positively or negatively influenced by the microorganisms which inhabit the gastrointestinal tract, and in particular the large intestine. These microorganisms, through the production of toxines, metabolic by-products and short-chain fatty acids, and the like, affect the physiological condition of the host.
The constitution and quantity of the gut microflora can be influenced by conditions or stress induced by disease, life-style, travel and other factors. If microorganisms which positively effect health and well-being of the individual can be encouraged to populate in the large bowel, this should improve the psychological well-being of the host.
The introduction of beneficial microorganisms or probiotics may be accomplished by ingestion of the organisms in drinks, yogurts, capsules, and other forms allowing viable organisms to arrive at the large bowel.
However, until now, no reliable method has been found or developed to stimulate the enteric nervous system (ENS) which regulates the intestinal bowel movements and secretory functions of epithelial layer in a sufficient manner.
The problem of the present invention was therefore to provide a method to intervene in the regulation of the intestinal bowel movements and secretory functions of epithelial layer in a sufficient manner to influence thereby the course of intestinal diseases.
The inventors of the present invention have conducted intensive studies and found as a result that intestinal function can be modulated by acetylcholine-producing microorganisms. Thereby a method for the targeted dual stimulation of motility and secretion by acetylcholine in the intestine through selection and specific administration of acetylcholine-producing microorganism, particularly lactic acid bacteria is provided. This treatment method is a promising alternative or addition to known therapies for chronic IBS and other disorders associated with impaired intestinal motility and secretion.
A first aspect of the present invention is therefore an acetylcholine-producing microorganism for the use in the prevention and/or treatment of intestinal diseases and/or reduction of risk of developing intestinal diseases.
A further aspect of the present invention is the non-medical use of an acetylcholine-producing microorganism for the maintenance and/or improvement of intestinal health, particularly for the improvement of intestinal health.
The acetylcholine-producing microorganism is a live organism and preferably capable of propagating in the intestinal area.
The term “intestinal area” as used herein is intended to include the small intestine and large intestine. Large intestine is intended to include the colon and rectum, and in humans, is intended to include the colon, rectum and caecum.
The term “reduction of risk of developing intestinal diseases” as used herein means that an individual being treated with the acetylcholine-producing microorganism of the present invention exhibits a lower risk to develop an intestinal disease caused by external stimuli or physiological processes compared to a non-treated individual.
The term “maintenance and/or improvement of intestinal health” as used herein means that an individual, upon treatment with the acetylcholine-producing microorganism, exhibits a different gut flora, which is beneficial for human or animal health and reasonable for a maintenance and/or an improvement of the digestion of said individual. The improved gut flora further may lead to an increased resistance of the subject to develop an intestinal disease by out-competing harmful bacteria and stimulating the normal bowel movement.
The term “microorganism” as used herein comprises bacteria and yeasts. The bacteria are preferably Lactobacillaceae such as Lactobacillus strains, in particular Lactobacillus sanfranciscensis strains, Lactobacillus rossiae strains, Lactobacillus lactis and Lactobacillus plantarum (Stephenson et al., The production of acetylcholine by a strain of Lactobacillus plantarum,
In certain embodiments, the microorganism is not a Lactobacillus plantarum strain, particularly not Lactobacillus plantarum strain 299v (DSM 9843), or Lactobacillus plantarum strain (ATCC 10241). In certain embodiments, the microorganism is not a Lactobacillus rhamnosus strain, particularly not Lactobacillus rhamnosus GG.
The intestinal diseases encompass inflammatory bowel diseases (IBD), such as ulcerative colitis, Crohn's disease, collagenous colitis, lymphocytic colitis, ischaemic colitis, Behçet's disease, indeterminate colitis, diversion colitis, pouchitis or microscopic colitis and/or colon cancer and/or diseases associated with microorganisms, such as candidiasis, small intestinal bacterial overgrowth, acute or chronic bowel infections, and/or diseases induced by sulphate-reducing bacteria, and/or intestinal diverticular, and/or intestinal carcinoma, and/or functional bowel disorders (FBD) such as irritable bowel syndrome, and/or disorders associated with the secretions of the intestinal wall controlled by the enteronervous system.
The term “Functional bowel disorder” (FBD) refers to gastro-intestinal disorders which are chronic or semi-chronic and which are associated with bowel pain, disturbed bowel function and social disruption. Particular combinations and prevalence of symptoms characterize in following seven FBD subgroups, which are defined in accordance with the classification system known as the “Rome criteria”: 1) C1: constipation-predominant irritable bowel syndrome; 2) C1: diarrhea-predominant irritable bowel syndrome; 3) C3: Functional constipation; 4) C4: Functional diarrhea; 5) C2: Functional abdominal bloating; 6) F3a: Pelvic Floor dyssynergia; 7) F3b: internal anal sphincter dysfunction.
More specifically, the intestinal disease may be a functional intestinal disorder and/or a disorder associated with the secretions of the intestinal wall controlled by the enteric nervous system, in particular functional constipation, functional diarrhea and/or irritable bowel syndrome (IBS), such as particular constipation-predominant IBS, alternating IBS or diarrhea-predominant IBS.
The acetylcholine-producing microorganism of the present invention is preferably useful for maintaining and/or promoting a healthy gut flora and/or reducing the toxic effects of the digestive process and/or stimulating the digestive system and/or improving intestinal control. The promotion of a healthy gut flora leads to an out-competing of the harmful bacteria in the intestines, in particular the large intestine, and more particularly the colon, and thereby reducing the toxic effect of the digestive process, stimulating the digestive system and improving bowel control.
The acetylcholine-producing microorganism of the present invention is preferably useful for modulating the course of inflammatory bowel diseases (IBD) in a beneficial way and relieving the symptoms of IBD patients by inhibition of the secretion of pro-inflammatory chemokine IP-10.
In another embodiment, the intestinal disease may be an inflammatory bowel disease. The diseases are preferably ulcerative colitis, Crohn's disease, collagenous colitis, lymphocytic colitis, ischaemic colitis, Behçet's disease, indeterminate colitis, diversion colitis and/or microscopic colitis. The diseases are more preferably ulcerative colitis and/or Crohn's disease.
The microorganism of the present invention is capable of producing acetylcholine. Preferably, the acetylcholine-producing microorganism produces ≧20, 25, 30, 35 or 40 mg/kg acetylcholine under suitable culture conditions as described, more preferably ≧40 mg/kg and even more preferably ≧35 mg/kg. Any culture medium might be used for the culture of the acetylcholine-producing microorganisms, which are suitable for Lactobacilli-culture. Preferably, MRS-broth is used as a culture medium. Preferably, the acetylcholine concentration is adjusted to a 106/ml bacteria count.
The acetylcholine-producing microorganism is preferably a bacterium. More preferably, the bacterium is a Lactobacillaceae such as a Lactobacillus strain, in particular a Lactobacillus sanfranciscensis strain, Lactobacillus rossiae strain, Lactobacillus brevis strain, or Lactobacillus plantarum strain, which are generally available from the public catalogue of Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH (Braunschweig, Germany).
In a more preferred embodiment, the Lactobacillus strain is selected from any one of strains DSM 26024, DSM 23090, DSM 23091, DSM 23200, DSM 23092, DSM 23093, DSM 23201, DSM 23174 and DSM 23121 or a strain cultivated therefrom, more particularly strain DSM 23090 or DSM 23093 or a strain cultivated therefrom. These strains have been deposited at the Leibnitz-Institut DSM—Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH (Braunschweig, Germany), according to the Budapest Treaty. The novel Lactobacillus strains have the following accession numbers and deposition dates: DSM 23090 (2012-06-21), DSM 23091 (2012-06-21), DSM 23200 (2012-06-21), DSM 23092 (2012-06-21), DSM 23093 (2012-06-21), DSM 23201 (2012-06-21), DSM 26024 (2012-06-04), DSM 23174 (2012-06-21), DSM 23121 (2012-06-21).
The term “strain cultivated therefrom” as used herein refers to offspring strains derived by cultivation of the original strain.
The acetylcholine-producing microorganism is preferably an acetylcholine-secreting microorganism. The term “acetylcholine-secreting microorganism” as used herein means that the microorganism secrets acetylcholine into the culture medium.
The present invention refers to the medical use of an acetylcholine-producing microorganism. Preferably, the microorganism is provided as a pharmaceutically acceptable dosage form or in form of a nutrient, e. g. food or beverage.
In one embodiment, the acetylcholine-producing microorganism is provided in a pharmaceutical composition. The acetylcholine-producing microorganisms can also be provided as an additive in a functional food or in a functional beverage. The pharmaceutical composition, food or beverages, incorporating the microorganism can be safely consumed and are especially recommended for subjects perceived to be at risk or suffering from gastro-intestinal dysfunction or organic disorders or diseases, e.g. conditions or symptoms related to IBS, or IBD. They contain the acetylcholine-producing microorganism preferably in an effective amount to treat or prevent said disorders or diseases.
As used herein, the term “an effective amount” refers to an amount effective to achieve a desired therapeutic effect, such as treating and/or preventing diseases, conditions and symptoms related to IBS or IBD.
The effective amount of the acetylcholine-producing microorganisms preferably comprises a dosage in the range of 106 to 1012 cfu/dosage form (colony forming units/dosage form), more preferably in the range of 107 to 0.5×1012 cfu/dosage form, even more preferably in the range of 109 to 1011 cfu/dosage form. The dosage form may be administered once or several times, e. g. 2, 3 or more times daily.
The pharmaceutical composition may be in liquid or solid form. The composition contains at least one of the acetylcholine-producing microorganisms or a mixture thereof and optionally a pharmaceutically acceptable carrier.
The amount of, e. g. microorganisms, incorporated into a pharmaceutical composition may vary from about 0.1 to about 100% by weight, preferably from about 2 to about 20% by weight, even more preferably from about 4 to about 10% by weight, based on the total weight of the composition.
The pharmaceutical composition of the present invention can be made in the usual pharmaceutical forms known in literature, such as for example tablets, coated tablets, capsules, packets, solutions, suspensions, emulsions, suppositories, pellets, syrups, vaginal suppositories, ointments, creams and so on. Preferably the composition comprises an enteric coating. They can be prepared in the usual manner by mixing the active ingredient with excipients and/or carriers, optionally adding adjuvants and/or dispersing agents. Should water be used as a diluent, also other organic solvents can be used in the form of adjuvants. Adjuvants can be e. g. water, non-toxic organic solvents such as paraffins, vegetable oils (peanut oil or sesame oil), alcohols (e. g. ethanol, glycerol), glycols (propylene glycol, polyethylene glycol). Solid carriers can be e. g. natural mineral flours (kaolin, talc), synthetic mineral flours (e. g. silicates), sugar (e. g. cane sugar). Emulsifiers can be alkyl sulphonates or aryl sulphonates and the like, dispersers e. g. lignin, methyl cellulose, starch and polyvinyl pyrrolidine and lubricants e. g. magnesium is stearate, talc, stearic acid, sodium lauryl sulphonate.
The composition may contain the acetylcholine-producing microorganisms lyophilized, pulverized and powdered, optionally for reconstitution in a pharmaceutically acceptable liquid carrier administered to intestinal area, e. g. oral, rectal or naso-duodenal. The administration takes place in the usual manner, preferably by oral/rectal route. It may then be infused, dissolved such as in saline, as an enema. As a powder, it can preferably be provided in a palatable form for reconstitution for drinking. The powder may also be reconstituted to be infused via naso-duodenal infusion.
Pharmaceutical forms adapted to this end can contain, in addition to usual excipients such as lactulose, dextrose, lactose, other additives such as sodium citrate, calcium carbonate, calcium dihydrogen phosphate, together with several additional substances such as starch, gelatin and the like. In case of liquid forms compatible coloring agents or flavoring substances may be added.
Further components of the composition containing the acetylcholine-producing microorganism may include an active agent, e. g. glutamin/glutamate or precursors thereof, mannans, galacturonic acid oligomers, herbal extracts such as Regulat® (registered trademark of Dr Niedermayer Pharma) and Iberogast® (registered trademark of Steigerwald Arzneimittelwerk GmbH), chokeberry beer yeast, a drug useful for the treatment of ulcerative colitis, such as sulphasalazine, 5-ASA agents, corticosteroids, such as adrenal steroid, prednisone, hydrocortisone, or budesonide, or drugs used against pain, diarrhea, infection or IBS such as serotonine-4 receptor agonist, e. g. tegaserod. The composition can be combined with other adjuvants such as antacids to dampen bacterial inactivation in the stomach. Acid secretion in the stomach could also be pharmacologically suppressed using H2 antagonists or omeprazole.
The composition of the invention may be provided in the form of a kit for is separate sequential or simultaneous administration in conjunction with such active agents as described herein above. These active agents may conveniently be formulated together with the composition of the invention in standard pharmaceutical dosage forms, e. g. in combination with at least one pharmaceutically acceptable carrier.
In another preferred embodiment, a composition containing the acetylcholine-producing microorganism can contain at least one additional microorganism, i.e. non-acetylcholine-producing microorganism such as a bacterium for maintaining and/or restoring favorable gut flora. The additional bacteria are preferably pro-biotic bacteria.
In another embodiment of the invention, the acetylcholine-producing microorganisms can preferably be provided as a probiotic, preferably as an additive to functional food or to functional beverages.
The amount of the microorganisms as a nutrient additive may vary from about 0.0001 to about 20% by weight, preferably from about 0.01 to about 10% by weight and even more preferably from about 0.1 to about 5% by weight.
In another preferred embodiment the acetylcholine-producing microorganisms can be applied to an edible material, preferably a food—or feed product such as cereals, in particular oat flakes or bread, a beverage or dairy products, in particular yogurt, sauerkraut juice, plant extracts such as Regulat®, fermented beverages or Brottrunk®. The application to the edible material may be achieved by coating said material with the acetylcholine-producing microorganisms, preferably by spraying the microorganisms onto the edible material. The acetylcholine-producing microorganisms can also be applied by injecting them into an edible material, such as bread, yogurt, or cheese, preferably sour dough bread.
The term “functional food” as used herein is food, which, in addition to its nutritional and sensory functions, has a positive effect on the metabolism and, within a balanced nutrition, contributes to an improvement of health, an increase in wellbeing and/or a reduction of health risks. The functional food may be a natural food or a food which has been altered by adding or cutting off a component.
In a preferred embodiment, the functional food is a fermented product, more preferably, the functional food is sour dough or sour dough bread.
The sour dough bread of the present invention has the advantage that it may not only contain the acetylcholine-producing strains, but in addition also high contents of other acetylated compounds such as N-acetyl-glycine, homoserine, canavanine, and the like.
The term “functional beverage” as used herein is a beverage, which in addition to its nutritional and sensory function, has a positive effect on the metabolism and, within a balanced nutrition, contributes to an improvement of health, an increase in wellbeing and/or a reduction of health risks. It takes its effect within normal food habits in an amount common for consumption.
The functional beverage may comprise additional components such as herbs, vitamins, minerals, aminoacids, or additional other food or vegetable ingredients to provide specific health benefits that go beyond general nutrition. Alternatively, it may include stimulants such as taurin, glucoronolactone, caffeine, B-vitamins, guarana, ginseng, gingko biloba, L-carnitine, sugars, antioxidants, yerba maté, creatine, milk thistle and the like. In a preferred embodiment, it additionally contains a prebiotic suitable to be digested by the acetylcholine-producing microorganisms of the present invention.
A preferred functional beverage is a drinking yogurt, a fermented grain beverage, alcohol-free beer, Brottrunk®, fruitjuice-based beverages or beverages containing plant or herbal extracts such as Iberogast®.
The functional food or functional beverage can preferably also be administered with at least one additional active agent for the treatment of intestinal diseases. The additional active agent can be selected from the group of medicaments as described above.
In another embodiment the active agent may preferably be at least one additional bacterium for maintaining and/or restoring a favorable gut flora. The additional bacterium can be selected form the group of probiotic bacteria.
Preferred pro-biotic bacteria can be selected from the group comprising Strains from Lactobacillus and Bifidobacterium such as Lactobacillus acidophilus, Lactobacillus johnsonii, Lactobacillus casei, Lactobacillus lactis, Lactobacillus reuteri, Lactobacillus rhamnosus and/or Bifidobacterium lactis.
Optionally, the composition can also contain a prebiotic. As used herein, a “prebiotic composition” is an at least non-digestible food ingredient that beneficially affects the host by selectively stimulating the growth, activity or both of one of a limited number of species of microorganisms already resident in the colon. The prebiotic is preferably a non-digestible oligosaccharide such as fructo-oligosaccharides, galacto-oligosaccharides, lactolose, xylo-oligosaccharides, isomalto-oligosaccharides, soy bean oligosaccharides, gentio-oligosaccharides, gluco-oligosaccharides, fructans, lactosuccrose, short-chain fructo-oligosaccharides, and mixtures thereof.
The present invention also provides a method for the production of acetylcholine by use of Lactobacilli. Preferably, a single Lactobacillus strain is used or a combination of Lactobacillus strains or a composition of Lactobacillus strains. The Lactobacillus strains used therefore are in particular Lactobacillus sanfranciscensis strains, Lactobacillus rossiae strains, Lactobacillus brevis strains, or Lactobacillus plantarum strains, more particularly strain DSM 26024, DSM 23090, DSM 23091, DSM 23200, DSM 23092, DSM 23093, DSM 23201, DSM 23174 and DSM 23121 or a strain cultivated therefrom, even more particularly strains DSM 23090 or DSM 23093.
Another aspect of the present invention is microbially produced acetylcholine for use in the treatment and/or prevention of intestinal diseases as described above. The acetylcholine may be produced preferably by the microorganisms of the invention. The microorganisms are preferably Lactobacillaceae such as Lactobacillus strains, in particular Lactobacillus sanfranciscensis strains, Lactobacillus rossiae strains, Lactobacillus brevis strains, or Lactobacillus plantarum strains. The intestinal diseases encompass the intestinal diseases described above such as inflammatory bowel diseases or functional bowel disorders. Preferably, the disease is irritable bowel syndrome and/or disorders associated with secretions of the intestinal wall controlled by the enteronervous system. The microbially produced acetylcholine may be administered orally, e.g. added to food and/or feed products. The addition may occur during the manufacture of the food and/or feed product by using the microorganisms of the invention also for the fermentation of the food and/or feed product. Such a fermented food product might be sour dough bread, wherein the live microorganisms are killed during the baking phase by heat, resulting in a sour dough bread containing acetylcholine produced by the microorganisms. The content of the microbial produced acetylcholine is in a range of about 5 to 1000 mg acetylcholine/kg food or feed product, preferably in a range from about 20 to 500 mg acetylcholine/kg feed product or food product, more preferably in a range from about 40-200 mg acetylcholine/kg feed product or food product. Preferably, the amount of acetylcholine equates to the recommended daily dosage.
Further, the invention shall be explained in more detail by the following examples.
Sourdough (Vollsauer) was prepared by traditional propagation of type I sourdough rye starter containing the Lactobacilli strains DSM 26024, DSM 23090, DSM 23091, DSM 23200, DSM 23092, DSM 23093, DSM 23201, DSM 23174 and DSM 23121. The composition of sourdough and sourdough bread is: 71% rye flour, 25% wheat flour, 1.8% salt and 2% bread crumbs (pH 4.5, acidity 9-10). The dough was baked at 298° C. for 1.5 hours. Analog bread was identical to sourdough bread with substitution of sourdough starter with 2.5% sodium bicarbonate, 0.13% acetic acid and 1.2% lactic acid.
Water extracts (<10 kDa) of sourdough, sourdough bread and analog bread as well as MRS growth media of lactic acid bacteria were subjected to LC-MS/MS analysis for metabolite quantification. MRS media was filtered with 10 kDa Vivaspin 500 filters (Sartorius Stedim biotech, Goettingen, Germany) before analysis.
Samples were measured using:
Dionex Ultra High Performance Liquid Chromatography UltiMate® 3000 (Dionex, Idstein, Germany)
The Chromatograms were analysed with Multiquant 2.0 (AB Sciex, Darmstadt, Germany) and concentrations in the samples were calculated according to the spectra of standards.
Sourdough, sourdough bread and analog bread were freeze-dried and grinded into powder. 100 g of powdered bread or sourdough was solubilized in 500 mL distilled water and extracted for 3 hours at 50° C. with constant stirring. The suspension was centrifuged at 9000 rpm for 20 min. The supernatant was collected and kept at 4° C. The pellet was re-suspended again in 500 mL distilled water and 3 hour extraction repeated. After centrifugation the pellet was again re-suspended in 500 mL distilled water and extracted overnight. Supernatants after three extraction steps (total volume of approx. 1.5 L) were pooled together and step-wise filtered using Vivaflow 200 cassettes of 0.2 μm, 100 kDa and 10 kDa exclusion thresholds (Sartorius, Goettingen, Germany). The filtrates of the 100 kDa and 10 kDa exclusion thresholds were freeze dried and re-suspended in distilled water to 25% for in vitro assays. 10 g of <10 kDa fraction was extracted from 100 g freeze-dried bread and sourdough.
Endotoxin concentrations measurement in water extracts from sourdough, sourdough bread and analog bread were determined using Limulus Amebocyte Lysate (LAL) Chromogenic Endpoint Assay (Hycult biotech, Uden, Netherlands). The assay was performed according to the manufacturer's instructions. Endotoxin contamination in water extracts from sourdough, sourdough bread and analog bread was removed using Detoxi-Gel™ Endotoxin Removing Columns (Thermo Scientific, Rockford, USA), containing a resin with immobilized polymyxin B to bind and remove pyrogens from solution. The removal of endotoxin was performed according to the manufacturer's instructions.
Interferon inducible protein (IP-10) (murine/human) and (murine) concentrations in cell culture supernatants were determined using the appropriate ELISA kits (R&D Europe, Abington, England) according to the manufacturer's instructions. The ELISA was performed using Nunc MaxiSorp® flat-bottom 96 well plates (Greiner Bio-One GmbH, Frickenhausen, Germany). Briefly 96-well plates were coated with the appropriate capture antibody overnight at RT. Plates were washed 3 times with phosphate buffered saline (PBS), blocked with 1% bovine serum albumin in PBS and incubated with cell culture supernatants for 1.5 h at RT. Plates were washed and incubated with the appropriate detection antibody for 1.5 h at RT. Plates were washed and incubated with a detection enzyme. Plates were washed and incubated with a substrate solution. Protein concentration was determined by photometrical analysis of the reaction of substrate and detection enzyme.
L. sanfranciscensis strains (DSM 23090, DSM 23091, DSM 23092, DSM 23093, DSM 23174, DSM 23200, DSM 23201) and L. rossiae (DSM 26024) isolated from sourdough, L. sanfranciscensis type strain DSM 20451 (DSMZ GmbH, Braunschweig, Germany), L. plantarum FUA 3038 and L. brevis 3113 (provided by Prof. Ganzle from University of Alberta, Canada), L. paracasei VSL#3 (provided by Dr. DeSimone, L'Aquila, Italy) were grown at 30° C. in MRS broth (pH 5.4) containing freshly added 0.15% L-cystein under anaerobic conditions using Anaerogen packages (Anaerogen, Basingstoke, Oxoid, UK). Fixed bacteria (5% formaldehyde, 4 hours, 4° C.) were washed three times with sterile PBS before use. Concentrated conditioned media (CM) were generated by transferring bacteria (5×107 cfu/ml) from anovernight culture to DMEM (1% glutamine, 20 mM HEPES) and anerobical cultivation overnight at 30° C. Bacteria and bacterial supernatant (CM) were separated after centrifugation (4500 g, 10 min, RT). CM was adjusted to pH 7.4, filter sterilized (0.22 μm), and concentrated (100×) using Vivacell filter systems with an exclusion size of 100 kDa (Satorius Stedim Biotech, Goettingen, Germany). Concentrated conditioned media was diluted to 1× in the cell culture stimulation experiments. Agar plates were obtained by adding 1.5% of agar to the above described respective medium.
Motility measurements were performed with corpus circular muscle preparations from Dunkin Hardley guinea pigs (Sulzfeld and Harlan Winkelmann GmbH, Borchen, Germany). Contractile force of the muscle was measured using force transducer in organ bath using LabChart 5 software (ADInstruments, Spechbach, Germany). Briefly, stomach muscle tissue was dissected from mucosa layer in continuously perfused ice-cold preparation Krebs solution (pH 7.4) (MgCl2×6H2O 1.2 mM, CaCl2×2H2O 2.5 mM, NaH2PO4 1.2 mM, NaCl 117 mM, NaHCO3 25 mM, C6H12O6 11 mM, KCl 4.7 mM). A 1.5 cm2 piece of corpus circular muscle was cut out and mounted from both ends with polyamide thread between two electrodes into organ bath in 20 mL experimental Krebs solution (identical to preparation Krebs except for NaHCO3 20 mM) at 37° C. and aerated continuously with Carbogen (95% O2 and 5% CO2). After an equilibration period of 45 min muscle is preparations were stimulated by electrical field stimulation (EFS) to test vitality. The change in contractile force during EFS as well experimental treatment was measured by the force transducer. The time lapse between any treatments was always 20 min.
The ion movement across intestinal epithelia was measured with Ussing chamber technique (Easy mount chambers, Physiologic instruments, San Diego, USA) and LabChart 5 software (ADInstruments, Spechbach, Germany). Briefly segments, of the distal colon of Dunkin Hardley guinea pigs (Sulzfeld and Harlan Winkelmann GmbH, Borchen, Germany) were dissected, the muscle layers removed and mucosa/submucosa preparations were mounted into slider with a recording area 0.5 cm2. Apical and basolateral sides were bathed separately in 5 mL Krebs solution. During experimental procedures, the bath was maintained at 37° C. and aerated continuously with Carbogen (95% 02 and 5% CO2). After an equilibration period of 45 min tissue was electrically stimulated (Parameters: stimulus strength 6V, duration 10 sec, frequency 10 Hz, single pulse duration 0.5 ms) to assess tissue vitality. For assessment of active ion transport spontaneous occurring transepithelial voltage (VTE) formed by passive ion transport across the tissue was set to 0 mV by applying short circuit current (ISC). When the active chloride ion secretion is induced an increase in ISC is observed necessary to keep VTE at 0 mV. The change in ISC is equivalent to the current generated by the anions secretion or cation absorption. Transepithelial resistance (TER=VTE/ISC×1000/2) of tissue was measured at the beginning and at the end of each experiment to assess the tissue integrity.
Data are expressed as mean values±standard deviation (SD). All statistical computations were performed using Statistical programming platform R comparing treatment vs. corresponding control group were analyzed using unpaired t-tests. Data comparing several treatments vs. corresponding control group were analyzed using One-Way ANOVA followed by an appropriate multiple comparison procedure. If data was not normally distributed or comprised discontinuous data, non-parametrical tests (Mann-Whitney/Rank sum test, ANOVA on ranks) were used. Differences were considered significant if p-values were <0.05 (*) or <0.01 (**). Principal component analysis (PCA) is described in Pearson, K.; On Lines and Planes of Closest Fit to Systems of Points in Space, Philosophical Magazine (1901), 2 (11), 559-572 and Theodoridis, G., Gika, H. G., Wilson, I. D.; LC-MS-based methodology for global metabolite profiling in metabonomics/metabolomics, TrAC Trends in Analytical Chemistry (2008), 27 (3), 251-260.
2.1) LC-MS/MS Analysis of Metabolites in Extracts from Sourdough, Sourdough Bread and Analog Bread
To compare the effect of fermentation on sourdough and sourdough bread water soluble extracts (<10 kDa, triplicates) of raw sourdough, sourdough bread and analog bread prepared from three different batches were subjected to LC-MS/MS analysis. The concentration of metabolites in extracts was determined by comparison to the standard solution with known concentration of metabolites.
Principal component analysis (PCA) demonstrated significant differences in metabolites isolated from sourdough, sourdough bread and analog bread (
Acetylcholine (ACH) is a neurotransmitter that is responsible for the activation of motility in the gastro-intestinal tract by stimulating either muscarinic (mACHR) or nicotinic ACH receptors (nACHR) on the muscle cells. To determine if the sourdough-derived acetylcholine mimicks this activity, isolated corpus muscle of guinea pig was stimulated with extracts of sourdough, sourdough bread and analog bread and the contraction stimulation was measured. Both sourdough and sourdough extracts but not analog bread extract induced muscle contractions similar to acetylcholine at equivalent concentration (
Furthermore to clarify whether sourdough-derived ACH acts through the activation of neurons that consequently stimulate muscle cells, muscle preparations were pre-treated with tetrodotoxin (TTX). TTX blocks action potential generated by neurons that abrogates downstream signalling. TTX pre-treatment had no significant effect on muscle contraction induced by acetylcholine and extracts suggesting that both directly activate mACHR on muscle cells (
2.3) Sourdough-Derived Acetylcholine Stimulates Secretion by the Intestinal Mucosa from the Luminal Side
Acetylcholine (ACH), released by the enteric neurons to the serosal side of the intestinal wall, stimulates secretion of chloride ions by the mucosa subsequently driving the passive transport of water into the lumen. This effect is transient due to rapid degradation of acetylcholine by acetylcholine esterase. The effect of sourdough-derived ACH on the intestinal secretory function was tested in guinea pig colon. Extracts of sourdough, sourdough bread, analog bread as well as (pure) ACH were applied on either luminal (mucosal) or serosal side of intestinal mucosa/submucosa preparations from guinea pig distal colon. The experiment was performed in Ussing chamber and the change in short-circuit current (ISC) was measured. In this system, passive flow of ions across a tissue or epithelial cell layer is eliminated by balancing electrical, osmotic, hydrostatic and chemical gradients across the preparation, such that only active ion transport is measured. In the Ussing chamber, electrodes are placed close to each side of the tissue to allow detection of the spontaneous potential difference (PD) across the epithelium, generated as a consequence of active ion transport (Hirota, C. L. and McKay D. M., Cholinergic regulation of epithelial ion transport in the mammalian intestine, Br. J. Pharmacol., 2006, 149(5):p. 463-79). Surprisingly an increase in ISC could be observed when the preparations were stimulated from both mucosal and serosal side by ACH as well as ACH-containing extracts (analog bread extract had no effect) (
The tissue was pre-treated with atropine and the effect of extracts on secretion measured again (
Earlier research provides evidence of the expression of ACHR in intestinal epithelial cells on the basolateral side but not on the apical side of the cell layer (Hirota, C. L. and McKay D. M., Cholinergic regulation of epithelial ion transport in the mammalian intestine, Br. J. Pharmacol., 2006, 149(5):p. 463-79). Therefore it is highly probable that ACH applied from apical side crosses the cell layer and stimulates the receptors on the basolateral side. This hypothesis was verified by the fact that when ACH is applied apically, i.e. on the mucosal or luminal side, the secretory effect was significantly inhibited when atropine was applied to the serosal but not to the mucosal side (
These observations show that external application of ACH at local sites could also be utilised to modulate ENS-mediated fluid secretion. This is especially important, since fluid secretion into the intestine is hypothesized to provide the ideal environment for enzymatic digestion and to facilitate the passage of stool through the intestinal tract. Furthermore recent studies suggest that acute and locally targeted water secretion serves as a protective measure against epithelial damage at points of particular mechanical stress (Barrett, K. E. and S. J. Keely, Chloride secretion by the intestinal epithelium: molecular basis and regulatory aspects. Annu Rev Physiol, 2000. 62: p. 535-72 and Sidhu, M. and H. J. Cooke, Role for 5-HT and ACh in submucosal reflexes mediating colonic secretion. Am J Physiol, 1995. 269(3 Pt 1): p. G346-51).
Seven strains of L. sanfranciscensis (DSM 23090-DSM 23201) and L. rossiae (DSM 26024) isolated from sourdough, L. plantarum FUA 3038 and L. brevis 3113 isolated from another sourdoughs, and L. paracasei (VSL#3) were grown for 24 hours in MRS media. The growth media was collected, filtered and analyzed using LC-MS/MS.
PCA analysis shows significant difference in the metabolites profiles of all sourdough isolated bacteria compared to L. paracasei. The separation is due in major part to the impact of acetylcholine present in sourdough bacteria growth media but not in L. paracasei media (
Lactocepin PrtP, a serine protease expressed in L. paracasei (VSL#3), selectively degrades pro-inflammatory chemokine interferone inducible protein 10 (IP-10). To investigate if PrtP is also present in the Lactobacilli of the present invention, the total bacterial DNA was isolated from eight sourdough strains: L. sanfranciscensis (DSM 23090, DSM 23091, DSM 23092, DSM 23093, DSM 23174, DSM 23200, DSM 23201) and L. rossiae (DSM 26024) as well as L. paracasei as positive control. DNA was amplified using Lactocepin PrtP specific primers and visualized on agarose gel. No detectable amounts of lactocepin PrtP gene were present in sourdough-isolated lactic acid bacteria. The eight sourdough lactic acid bacteria strains and L. paracasei were tested for their effects on the secretion of pro-inflammatory chemokine IP-10 by unstimulated and TNF-activated Mode-K cells. Interestingly, both conditioned media (
| Number | Date | Country | Kind |
|---|---|---|---|
| 13153996.7 | Feb 2013 | EP | regional |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2014/052129 | 2/4/2014 | WO | 00 |
