EP1353680A2 - Verwendung von slpi zur behandlung chronisch-entzündlicher darmerkrankungen - Google Patents

Verwendung von slpi zur behandlung chronisch-entzündlicher darmerkrankungen

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Publication number
EP1353680A2
EP1353680A2 EP01985389A EP01985389A EP1353680A2 EP 1353680 A2 EP1353680 A2 EP 1353680A2 EP 01985389 A EP01985389 A EP 01985389A EP 01985389 A EP01985389 A EP 01985389A EP 1353680 A2 EP1353680 A2 EP 1353680A2
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EP
European Patent Office
Prior art keywords
use according
slpi
microorganism
pharmaceutical composition
active ingredient
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EP01985389A
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German (de)
English (en)
French (fr)
Inventor
Manfred Nilius
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Vivotec Biomedical Technologies GmbH
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Vivotec Biomedical Technologies GmbH
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Publication of EP1353680A2 publication Critical patent/EP1353680A2/de
Withdrawn legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides
    • A61K38/16—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • A61K38/55—Protease inhibitors
    • A61K38/57—Protease inhibitors from animals; from humans
    • 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
    • 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
    • A61P1/04—Drugs for disorders of the alimentary tract or the digestive system for ulcers, gastritis or reflux esophagitis, e.g. antacids, inhibitors of acid secretion, mucosal protectants
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/81—Protease inhibitors
    • C07K14/8107—Endopeptidase (E.C. 3.4.21-99) inhibitors
    • C07K14/811—Serine protease (E.C. 3.4.21) inhibitors

Definitions

  • the present invention relates to the use of secretory leukocyte protease inhibitor (SLPI) or a non-pathogenic microorganism capable of SLPI formation, which contains an SLPI-encoding nucleic acid, for the treatment of inflammatory bowel diseases of humans and animals, pharmaceutical compositions for oral or rectal administration containing the active ingredient SLPI or SLPI-expressing microorganisms, and process for the preparation of these pharmaceutical compositions.
  • SLPI secretory leukocyte protease inhibitor
  • IBD Chronic inflammatory bowel diseases
  • enteritis necrotic enteritis regionalis Crohn (Crohn's disease)
  • colitis cystica colitis granulomatosa
  • colitis gravis colitis haemorrhagia
  • colitis ischaemica colitis mueosa and ulcerative colitis
  • enteritis regionalis Crohn (Crohn's disease) and ulcerative colitis differ in their distribution pattern, their macroscopic, and histological picture.
  • Crohn's disease is an unspecific granulomatous inflammation that can affect all sections of the digestive tract from the esophagus to the anus, depending on but mainly occurs in the area of the lower ileum and the colon. In about 40% of all cases, only the terminal ileum is affected, rarely the esophagus and stomach. Ulcerative colitis is a diffuse, continuous inflammation of the large intestinal mucosa, which is characterized by ulcerations and islands of mucous membrane that remain between them. The disease only rarely spreads to the small intestine. The definitive diagnosis of IBD can often only be made through the chronic course.
  • ulcerative colitis only the mucous membrane is affected, while Crohn's disease has granulomas, with all layers of the wall being affected and often forming fistulas. However, it is often not possible to separate Crohn's disease from ulcerative colitis.
  • the treatment of Crohn's disease and ulcerative colitis mainly aims to alleviate the symptoms.
  • the currently established treatments for 'inflammatory bowel disease are mainly based on non-specific anti-inflammatory agents such as glucocorticoids and Aminosali- zylaten.
  • glucocorticoids By reducing the nuclear factor Kappa B, glucocorticoids inhibit the synthesis of almost all pro-inflammatory cytokines, the expression of adhesion molecules and the production of prostaglandins and leukotrienes. Long-term prophylaxis with glucocorticoids does not make sense, however, since it has been shown that long-term administration is associated with serious undesirable effects. Absolute contraindications to glucocorticoid therapy are abscesses, relative contraindications are conglomerate tumors or intra-abdominal resistance and enteroenteral fistulas. With newly developed glucocorticoids, for example bududeonide, it can be seen that the side effects of steroid therapy can be reduced, at least in the short term.
  • budesonide In the acute phase, however, budesonide must be dosed so high that, in addition to the topical effect, a systemic effect can be observed, albeit comparatively low.
  • Aminosalizylates also reduce the nuclear factor Kappa B and thus the formation of pro-inflammatory cytokines or their receptors. However, this effect is far less pronounced than with steroid treatment.
  • Amino salicylates are generally less effective than glucocorticoids in the treatment of inflammatory bowel diseases.
  • the galenic formulations currently used were designed with the aim of different release characteristics, that is to say release from the proximal small intestine to the proximal colon. So far, however, it has not been ensured that the different anatomical release locations actually have a therapeutic advantage in the sense of locally targeted therapy.
  • glucocorticoids or aminosalizylates are accompanied by a change in diet.
  • Complete parenteral nutrition is essential for severe Crohn's disease and ulcerative colitis flare-ups. Especially in children with growth disorders or with severe steroid side effects. prescribed a balanced enteral diet.
  • carbohydrate-reduced diet or fish oil supplements sometimes showed contradicting findings (Stange and Schreiber, - Irishs ⁇ videblatt, 22 (1997), 1493-1498).
  • immunosuppressive therapy is used in the narrower sense, ie with drugs such as azathioprine, its metabolite 6-mercaptopurine, methotrexate and cyclosporin.
  • Azathioprine causes a number of side effects, including dose-independent allergic reactions, such as nausea, diarrhea, joint pain and an increase in liver enzymes, and dose-dependent side effects, such as cytopenia, infections and toxic hepatitis.
  • Methotrexate is an immunosuppressive substance that. inhibits the enzyme dihydrofolate reductase and thus interferes with the purine metabolism. Methotrexate has numerous effects on the human immune system. It suppresses antibody production of B cells, monocyte activation, neovascularization and activation of granulocytes. Methotrexate is currently only used in cases of azathioprine-resistant forms of Morbus Crohn, but not in ulcerative colitis.
  • Cyclosporin A acts preferentially on lymphocytes and inhibits their clonal expansion and proliferation.
  • the clinical use of cyclosporin A in the treatment of chronically active Crohn's disease was found to be ineffective (Neurath and Stange, Deutsches ⁇ videblatt, 28-29 (2000), 1672-1678).
  • cyclosporin A often causes side effects such as hypertension, diabetic metabolism, renal failure and occasionally opportunistic infections.
  • L. lactis is a gram-positive, non-pathogenic bacterium that is not part of the natural intestinal flora.
  • ulcerative colitis contributes to the development of the IBD form.
  • lymphocytes treated with an E. coli lipopolysaccharide extract exert cytotoxic activity against epithelial cell colonies (Shorter et al., Gastroenterology, 58 (1970), 692-698).
  • ulcerative colitis has more haemolytic, entero-toxic or necrotoxic strains of E. coli than healthy volunteers.
  • One strategy for treating ulcerative colitis is to administer broad-spectrum antibiotics. However, no therapeutic effect was found for vancomycin. Tobramycin, whose activity is mainly directed against gram-negative bacteria such as E. coli, seems to have at most short-term effects in ulcerative colitis.
  • Natural or recombinant bacterial strains are also used to treat other human and animal diseases.
  • WO 99/26642 describes the use of the non-pathogenic E. coli strain DSM 6601 for the treatment of diarrhea in the veterinary sector.
  • Vandenplas (Clin. Mikrobiol. And Infect., 5 (1999), 299-307) describes the use of biotherapeutic agents, in particular living bacteria and yeast cells, for the treatment of acute and chronic infectious gastroenteritis. Paton et al.
  • Endogenous proteolytic enzymes are known to be directly or indirectly involved in the pathogenesis of various diseases in the human or animal body. Endogenous proteolytic enzymes primarily serve to break down penetrating microorganisms, antigenic Antibody complexes and certain tissue proteins that the organism no longer needs. In a normal healthy organism, proteolytic enzymes are produced in a limited amount and regulated by the synthesis of a number of protease inhibitors. Tissues that are particularly exposed to proteolytic attacks and infections, such as tissues of the respiratory tract, normally contain a large number of protease inhibitors. In certain cases, for example severe pathological processes such as sepsis or acute leukemia, the amount of free protectolytic enzymes increases.
  • protease-mediated tissue destruction which includes emphysema, arthritis, glomerulonephritis, periodontitis, muscular dystrophy, tumor invasion and other pathological conditions.
  • protease inhibitors identified so far include the secretory leukocyte protease
  • the 12 kilodalton protein has been detected particularly in those places in the body where it is in direct contact with its environment, for example in the parotid gland and in the epithelia of the paranasal sinus, trachea and bronchi.
  • SLPI inhibits, among other things, human leukocyte elastase, cathepsin G and • human trypsin.
  • Leukocyte elastase is a serine protease of particular interest since the enzyme releases connective tissue and when extracellular degrades associated proteins.
  • Leukocyte elastase has been associated with various pathological conditions, such as emphysema and rheumatoid arthritis.
  • Trypsin is also a protease of particular interest since it is known that trypsin can initiate the breakdown of certain soft organ tissue, for example pancreatic tissue, during pancreatitis. It is known from Cathepsin G that this protease can degrade a number of proteins in vitro, for example proteins of the complement pathway. SLPI also has antiviral, antifungal and antibacterial effects.
  • SLPI also appears to play a role in the development of chronic gastritis.
  • Nilius et al. in: Cellular Peptidases in Immune Functions and Diseases 2 (Editor: Langner and Ansorge), (2000), 445-454, Kluwer Academic / Plenum Publishers) that with Helicobacter pylori infection of the gastric mucosa, the one formed by epithelial cells of the gastric mucosa and secreted SLPI is significantly reduced.
  • No. 5,633,227 discloses a method for the treatment of mast cell-mediated disease states in mammals by administration of a pharmacologically active SLPI fragment or a mutein thereof. A method of treating asthma or allergic rhinopathy using SLPI is also described. The document also discloses a method for inhibiting trypase or tryptase-mediated disease states by administration of SLPI peptides or protein parts.
  • US 5,851,983 discloses a polypeptide which comprises the C-terminal SLPI part and can thus inhibit elastase.
  • a pharmaceutical composition comprising this polypeptide and a method for the treatment of diseases are described which are either caused by excessive activation of neutrophils or which are related to the neutrophil protease.
  • diseases can be inflammatory diseases, platelet aggregation thrombosis and reperfusion damage after ischemia, but also diseases such as chronic bronchitis, ARDS, kidney inflammation, pneumonia etc.
  • WO 94/06454 describes a method for inhibiting retrovirus infections, in particular infections with HIV, SLPI proteins or analogs or derivatives thereof being administered.
  • the document also discloses specific SLPI coding nucleotide sequences as well as the proteins encoded by these sequences.
  • WO 99/17800 discloses a pharmaceutical composition comprising the SLPI protein.
  • This medicinal product is particularly suitable for the treatment of respiratory diseases, for example lung diseases, for the treatment of diseases caused by increased Amounts of proteases are characterized and designed for the treatment of leukocyte- or mast cell-mediated diseases.
  • US 6,132,990 discloses methods for the production of recombinant serine protease inhibitors and DNA sequences which can be used for this.
  • the protein disclosed can inhibit chymotrypsin and elastase, but not trypsin.
  • JP 07103977 A describes a method for the detection of SLPI and SLPI-elastase complexes using antibodies directed against SLPI.
  • the system is used in particular for the detection of respiratory diseases.
  • the present invention is therefore based on the technical problem of providing agents which can be used for the treatment of inflammatory bowel diseases and methods for producing and using such agents, the agents being used to treat the causes of IBD to a greater extent than the agents previously used enable and, in contrast to the previously used agents, enable topical therapy without the systemic side effects described in the prior art occurring.
  • SLPI fragment thereof, a complex thereof, a derivative thereof, an analog thereof, one of the .
  • IBD chronic inflammatory bowel diseases
  • the ulcers with deep fissures suggest that proteolytic degradation of the intestinal tissue takes place in chronic inflammatory bowel diseases.
  • the intestine is generally characterized by the fact that a rapid tissue turnover takes place on the surfaces. The breakdown and restoration of the extracellular matrix must therefore be closely monitored in healthy tissue to prevent erosion and ulceration and thus impairment of the intestinal function.
  • the amount of secretory leukocyte protease inhibitor in the intestinal mucosa of Crohn's disease patients is considerably decimated compared to the intestinal mucosa of healthy patients.
  • Such inflammatory proteases can act, for example, neutrophil elastase, cathepsin G and chymases, which originate in particular from the neutrophils and eosinophils and macrophages which occur increasingly in the intestinal mucosa of IBD patients.
  • the active substance ie SLPI, a fragment thereof, a complex thereof, a derivative thereof or an analogue thereof
  • the active substance itself preferably in isolated and purified form
  • the targeted delivery of the active ingredient, for example SLPI itself, into the affected anatomical areas in IBD patients protects the intestinal surface from degradation by the proteolytic activity of proteases. Since SLPI has also been shown to have antiretroviral, antimycotic and antibacterial effects, the targeted delivery of SLPI into the intestine also leads to a fight against secondary infections, which often accompany IBD diseases. These include, for example, infections caused by salmonella and enterotoxigenic coli bacteria.
  • not the isolated and purified active ingredient itself but one. expressable nucleic acid encoding the active substance SLPI or a fragment or derivative thereof, which is found in a living,. non-pathogenic microorganism capable of SLPI formation is contained, for the treatment of diseases of the IBD Shape circle is used.
  • the non-pathogenic microorganism which contains the nucleic acid encoding the active ingredient, for example SLPI, and expresses the active ingredient, is introduced into the intestine, where it preferably colonizes the intestine and then within the intestinal lumen over a certain, preferably longer, Period of time expressed the active ingredient SLPI and delivers it directly to the cells of the diseased intestinal epithelia.
  • the non-pathogenic microorganism used is an Escherichia coli strain, for example the E. coli strain (Nissle 1917), the beneficial effect of SLPI can be combined with the beneficial effect of E. coli (described in the prior art). Nissle 1917) on the remission of IBD diseases. Since the microorganisms, such as bacteria, continuously and over a longer period of time, a certain amount of the active ingredient SLPI directly to the affected tissues be dispensed, the bioavailability - of the active ingredient SLPI is extraordinarily high, since pharmaceutical factors, such as manufacturing processes, solubility, etc., which influence the bioavailability of an active ingredient in conventional medicinal products, play no role.
  • Presystemic elimination that is, the metabolism of the active ingredient SLPI, which otherwise significantly limits the bioavailability of active ingredients, only plays a minor role.
  • Another advantage that should not be underestimated is that the cost-intensive isolation and purification of the active ingredient SLPI from bacteria or animal or human tissues is eliminated.
  • chronic inflammatory bowel diseases means chronic recurrent, specific inflammations of the intestine, in particular ulcerative colitis and Crohn's disease.
  • IBD indeterminate colitis
  • the term also encompasses all diseases which are known under the term “indeterminate colitis” and for which no clear association with a specific clinical picture is possible.
  • the term also includes all extraintestinal IBD concomitant diseases, for example chronic hepatitis, cirrhosis, granulomatous, urolithiasis, amyloidosis, erythema nodosum, pyoderma gangrenosum, stomatitis aphthosa, arthritis, drumstick fingers, uveitis / ulceris ,.
  • an “active substance” is understood to mean SLPI itself, fragments thereof, complexes thereof, derivatives thereof or analogues thereof, as long as they have the biological activity necessary for the use according to the invention.
  • the term SLPI is generally used with the same meaning as the aforementioned active ingredient.
  • the term “active substance” is understood to mean therapeutic agents which can be used either prophylactically or accompanying the disease in order to avoid, alleviate or eliminate disease states.
  • secretory leukocyte protease inhibitor is understood to mean a eukaryotic protein which has an inhibitory effect on serine proteases, in particular leukocyte elastase, trypsin and cathepsin G, and also has antiretroviral, antifungal and antibacterial activity.
  • the active ingredient SLPI used according to the invention can be of natural origin, for example a protein isolated from a eukaryotic tissue, preferably from a mammalian tissue, more preferably from a human tissue.
  • the active ingredient SLPI can also be a protein or synthetic that is produced with the aid of recombinant DNA techniques Of origin, for example a protein produced using the solid phase synthesis method of Merrifield (Angew. Chem., 97 (1985), 801).
  • fragments are parts of the SLPI protein. were of sufficient length to carry out the activities described above.
  • a fragment of SLPI is thus understood to mean a protein part which has fewer amino acids than native SLPI, that is to say less than 132 amino acids, but in which the two main domains, namely the carboxy-terminal region, which has the antiproteinase activity, and the amino-terminal region which exerts the antimicrobial activity against, for example, Staphylococcus aureus.
  • Such a fragment is preferably characterized by the presence of four disulfide bridges, so that the tertiary structure of the protein is essentially preserved.
  • a “complex” is understood to mean a compound which, in addition to SLPI, comprises several other constituents, for example a multi-enzyme complex or a heteromeric protein which consists of an ordered association of functionally and structurally different enzymes, including SLPI, for example an SLPI elastase 1 complex.
  • an SLPI complex can be a natural SLPI complex.
  • SLPI complex produced in vitro which contains other protease inhibitors, for example ⁇ 2 - macroglobulin, ⁇ , protease inhibitor (oci-PI), ⁇ ⁇ antichymotrypsin, ⁇ i anti-collagenase and ⁇ i-trypsin Inhibitor includes.
  • protease inhibitors for example ⁇ 2 - macroglobulin, ⁇ , protease inhibitor (oci-PI), ⁇ ⁇ antichymotrypsin, ⁇ i anti-collagenase and ⁇ i-trypsin Inhibitor includes.
  • “derivatives” are understood to mean functional equivalents or descendants of SLPI which are included maintenance of the basic SLPI structure by substitution of atoms or molecular groups or residues and / or whose amino acid sequences differ from that of the naturally occurring human or animal SLPI protein in at least one position, which, however, is essentially a high degree have homology at the amino acid level and comparable biological activity.
  • the term “derivative” also includes fusion proteins in which functional domains of another protein, for example another protease inhibitor, are present on the N-terminal part or on the C-terminal part.
  • “Homology” means in particular a sequence identity of at least 80%, preferably at least 85% and particularly preferably at least more than 90%, 95%, 97% and 99%.
  • the term "homology” known to the person skilled in the art thus denotes the degree of relationship between two or more polypeptide molecules, which is determined by the agreement between the sequences. A match can mean both an identical match and a conservative amino acid exchange.
  • a derivative and native SLPI for example, by mutations, such as deletions, substitutions, insertion reactions, additions, base exchanges and / or recombinations have originated the 'amino acid sequences encoding nucleotide sequences.
  • mutations such as deletions, substitutions, insertion reactions, additions, base exchanges and / or recombinations
  • these can also be naturally occurring sequence variations, for example such as sequences from another organism or sequences which have been mutated in a natural way, or mutations which have been introduced into the corresponding sequences with the aid of conventional means known in the art, for example chemical agents and / or physical agents ,
  • an "expressible nucleic acid encoding SLPI or a fragment or derivative thereof” is understood to mean a nucleic acid which encodes an SLPI protein, fragment or derivative thereof which comprises the functional domains, in particular the antiprotease activity, which antiretroviral activity, which has antimicrobial activity and antifungal activity of native SLPI.
  • the nucleic acid sequence used according to the invention can be a DNA or RNA sequence in linear or circular form.
  • the nucleic acid may be a nucleic acid isolated from natural sources, for example from eukaryotic tissues, preferably from mammalian tissues, more preferably from human tissues, or may have been produced synthetically.
  • SLPI sequences from a eukaryotic organism preferably from a mammal, preferably from human
  • SLPI coding sequence in the case of having used in this invention they are used in a non-pathogenic bactericidal to a form that 'their expression in the bacterium, i.e. a prokaryotic microorganism.
  • a nucleic acid isolated from natural sources is preferably changed such that, for example, its intron sequences are removed, since most bacteria do not have any suitable cellular mechanisms for the correct removal of the intron sequences.
  • the native sequences of the nucleic acid encoding a signal peptide are preferably also removed, since the proteins of bacteria, if any, have different signal sequences than the proteins of eukaryotes.
  • the codon composition of the nucleic acid originating from a eukaryotic tissue is also changed depending on the host organism in order to achieve a more efficient expression of the eukaryotic gene in the prokaryotic host organism. It is known that prokaryotes have a different tRNA population than eukaryotes and therefore often use different codons. This different "codon usage" can limit an efficient expression of eukaryotic genes in bacteria.
  • sequence used according to the invention and coding for SLPI is to be used in non-pathogenic fungal microorganisms, for example ascospore-forming yeasts such as Saccharomyces boulardii, their naturally existing intron sequences may have to be removed.
  • yeast cells have cellular mechanisms for removing intron sequences, but there are differences to higher eukaryotes.
  • the native signal peptide encoding must Sequences of the sequence used according to the invention are removed, since it has been shown that some, but not all, signal sequences of mammalian proteins are recognized by the yeast cell and processed correctly. However, it is not necessary to change the codon composition in the sequence used according to the invention, since high expression rates of foreign genes, in particular eukaryotic genes, have been observed in yeast cells.
  • a non-pathogenic microorganism capable of SLPI formation means that a microorganism used according to the invention is not pathogenic to the macroorganisms, that is to say people or animals into which it is to be introduced, and that it has the can correctly transcribe and translate nucleic acid from a eukaryotic organism, possibly brought into an expressible form, a protein with the activity of SLPI being produced in the cytoplasm of the microorganism and transported from the cytoplasm through the outer membranes at least into the periplasmic space and preferably to the Environment of the microorganism is released.
  • a microorganism introduced into affected intestinal sections of IBD patients is able to express a protein with SLPI activity over a certain period of time and to deliver it directly to the intestinal epithelial tissue.
  • the non-pathogenic microorganism is therefore preferably able to live in the intestine of a human or an animal for a certain period of time and colonize it if necessary. In this way, the observed SLPI deficiency in the intestinal mucosa of IBD patients can be compensated and the associated clinical manifestations can be eliminated.
  • the active ingredient SLPI is used for the treatment of IBD diseases by administering the, preferably isolated and purified, active ingredient in a pharmaceutical composition.
  • a pharmaceutical composition is understood to mean a mixture comprising active or natural or synthetically produced active substances used for diagnostic, therapeutic and / or prophylactic purposes, the active substances being contained in a form which can be administered well to the patient ,
  • the pharmaceutical composition can be a solid or liquid mixture.
  • a pharmaceutical composition comprising SLPI may contain one or more pharmaceutically acceptable exipients.
  • the pharmaceutical composition can comprise further additives, such as stabilizers, thickeners, release agents, lubricants, colorants, odorants, flavors, emulsifiers or similar substances used in the field.
  • the pharmaceutical composition in a con- tained, isolated and purified active ingredient to a IBD patients is administered in a dose sufficient, 'corresponds to the state of the chronic cure or prevent inflammatory bowel disease, stop the progression of inflammatory bowel disease and / or relieve the symptoms of inflammatory bowel disease.
  • the active ingredient is therefore dosed in such a way that an optimal therapeutic effect is achieved without significant toxic side effects, the success of the treatment lasting in the long term.
  • the isolated and purified active ingredient contained in the pharmaceutical composition is administered one to three times a day in a dose of 1 to 5000 mg of active ingredient.
  • the amount of the active ingredient to be administered to a patient depends, among other things, on the dosage form, the age, gender and body weight of the patient to be treated and the severity of the disease. The exact dose with which a patient is to be treated must therefore be determined individually by the treating doctor.
  • the . isolated and purified active ingredient contained in the pharmaceutical composition is administered orally.
  • Oral administration of the active ingredient is particularly preferred in those IBD diseases that affect the upper intestinal tract, such as the duodenum or small intestine.
  • the active ingredient is preferably administered in the form of a suspension, tablet, pill, capsule, a lozenge, granules, powder or a similar suitable dosage form.
  • enteric coatings are known in the art.
  • Oral drug forms are particularly preferred which have a delayed active substance release mechanism in order to topically treat the intestinal mucosa of IBD patients from the lumen in the long term.
  • the structure and composition of such drug forms with delayed drug release are also known in the art.
  • a pharmaceutical composition containing the isolated and purified active ingredient is administered rectally. Rectal administration of the active ingredient is preferred in the treatment of IBD diseases which affect in particular the lower intestinal area, for example in ulcerative colitis, which always begins in the rectum and spreads in the proximal direction in many affected persons.
  • the active ingredient is preferably administered in the form of a suppository, clysmas, foam or a similarly suitable dosage form.
  • the, preferably isolated and purified, active ingredient is administered parenterally, that is, bypassing the gastrointestinal tract. Parenteral administration of the active ingredient can be indicated in particular if the therapy of inflammatory bowel diseases is accompanied by parenteral nutrition. This form of therapy can also be beneficial for children with growth disorders.
  • the active substance is administered parenterally, in particular by means of injections or infusions.
  • the treatment of a IBD patient is not carried out with the isolated and purified active substance SLPI itself, but with a non-pathogenic microorganism capable of SLPI formation, which is the active substance SLPI or a fragment or derivative thereof contains encoding, expressible nucleic acid.
  • a non-pathogenic microorganism capable of SLPI formation which is the active substance SLPI or a fragment or derivative thereof contains encoding, expressible nucleic acid.
  • the non-pathogenic microorganism is able to produce the active ingredient before, during or after administration to a human or an animal and to deliver the active ingredient produced to the diseased organs of the digestive tract after administration.
  • the non-pathogenic microorganisms used are bacterial or fungal microorganisms which belong to the commensals of humans or animals.
  • “commensals” are understood to mean non-pathogenic microorganisms which live from the food of their host, for example a human or animal, or their secretions, for example saliva or mucus.
  • Such commensals live, among other things, on the mucous membranes of the mouth, respiratory, urinary and genital organs or in the intestine.
  • the commensals used according to the invention are preferably saprophytic microorganisms, but not parasitic common microorganisms which are frequently pathogenic.
  • a fungal non-pathogenic commensal microorganism is used as the host cell for the nucleic acid coding for the active ingredient SLPI or a fragment or derivative thereof.
  • the fungal microorganisms belonging to the eukaryytes for example yeasts
  • yeast cells can secrete the gene products of eukaryotic genes, that is, transport the gene products out of the cell and release them to the environment.
  • the proteins can be glycosylated during secretion.
  • Very large DNA fragments can also be cloned in yeast cells.
  • Yeast cells are therefore particularly suitable for cloning and expression of SLPI and its delivery to the intestinal epithelia.
  • the fungal microorganism preferably belongs to the genus Saccharomyces, that is to say to yeasts which form ascospores.
  • the fungal non-pathogenic common microorganism used according to the invention is Saccharomyces boulardii.
  • the non-pathogenic microorganisms belong to the natural intestinal flora of humans or animals.
  • This is particularly advantageous insofar as the intestinal flora of the patient is not infiltrated with germs whose influence on the composition of the natural intestinal flora or the pathological occurrence associated with IBD diseases is unknown or difficult to assess.
  • the microorganisms used according to the invention are physiologically very well adapted to the special conditions within the mammalian intestine, so that the microorganisms used according to the invention can successfully compete for nutrients with the germs naturally occurring in the patient's intestine.
  • microorganisms of the normal intestinal flora mediate a protective infection against pathogenic or opportunistic microorganisms.
  • both are used non-pathogenic microorganism is an aerobic or anaerobic gram-negative bacterium of the natural intestinal flora of humans or animals.
  • the Gram-negative host bacterium used according to the invention preferably belongs to the genus Escherichia, Pseudonomas, Bacterioides or Proteus.
  • the gram-negative host bacteria used are the strain Escherichia coli (Nissle, 1917), which corresponds to Escherichia coli DSM 6601. This strain is not pathogenic to humans.
  • Escherichia coli (Nissle, 1917) is known to show antagonistic activities against various pathogenic and non-pathogenic enterobacteria. The antagonistic activity of E.
  • coli (Nissle 1917) is probably due to the production of bacteriocins or microzines (Blum, Marre and Ralpher, Infection, 23 (1995), 234-236), but can also be blocked by receptors of the intestinal mucosa in connection (Rembacken et al., The Lancet, 354 (1999), 635-639). It is also known from E. coli (Nissle 1917) that ulcerative colitis patients treated with this strain showed remissions that were comparable to those of the drug mesalazine, but without the side effects known from mesalazine (Rembacken et al., . The Lancet, 354 (1999), 635-639). The strain E.
  • E. coli (Nissle 1917) thus offers the particular advantage that the beneficial effect of the wild-type strain on the course of the disease of IBD diseases with the advantageous effect according to the invention.
  • an SLPI feeder on the heating Development process of IBD disease course can be combined.
  • E. coli (Nissle 1917) is commercially available under the name "Mutaflor” from Ardeypharm GmbH, Herdecke, Germany.
  • Escherichia coli also has the great advantage that it is the most researched microorganism that is most often used for genetic engineering experiments. Many genetic engineering methods and cloning vectors have been developed for this bacterium.
  • the non-pathogenic microorganism used is an aerobic or anaerobic gram-positive bacterium of the natural intestinal flora.
  • the normal intestinal flora is colonized by many gram-positive bacteria, which include, for example, Bifidobacterium, Streptococcus, Staphylococcus and Corynebacterium species.
  • Bifidobacterium bifidum is the most common intestinal inhabitant of breast children, but also represents a substantial part of the normal intestinal flora of bottle children and adults as well as possibly all warm-blooded animals To be able to secrete genes, that is, to transport the gene products out of the cell and release them to the environment.
  • Gram-positive host bacteria are therefore special. Dimensions also suitable for the expression of SLPI and delivery to the intestinal epithelia.
  • a preferred embodiment of the present invention therefore comprises the use of gram-positive bacteria of the genera Bifidobacterium, Streptococcus, Staphylococcus and Corynebacterium as host bacteria for the nucleic acid encoding the active ingredient SLPI or a fragment or derivative thereof.
  • the gram-positive host bacterium used is Streptococcus gordonii, which is a non-pathogenic and naturally transformable commensal bacterium (see Beninati et al., Nature Biotechnology, 18 (2000), 1060-1064).
  • non-pathogenic microorganisms which do not belong to the natural intestinal flora or are not commensals of humans or animals are used for the expression of the nucleic acid encoding the active ingredient SLPI, provided that they are capable of forming SLPI and are non-pathogenic to the host in which they are to be introduced.
  • Such microorganisms are preferably bacteria which can live in the intestine of humans or animals at least over a certain period of time. In addition, such bacteria must not have an adverse effect on the course of an inflammatory bowel disease or on the therapeutic effect of SLPI.
  • Nucleic acid that can be used include bacteria that are used for the fermentative production of foods.
  • Particularly preferred examples are lactic acid bacteria, such as Lactococcus lactis, Lactobacillus delbrueckii subspec. bulgaricus, Lactobacillus caucasicus, Lactobacillus casei, Lactobacillus kefir, Streptococcus therm ⁇ philus, some Leuconostoc species and the like.
  • mutants of the non-pathogenic microorganisms used according to the invention are used to express the nucleic acid encoding the active substance SLPI, in which the outer cell envelope is changed, so that certain expressed proteins can leave the cell and reach the surroundings of the cell , Such mutants are also referred to as "leaky mutants".
  • Leaky mutants with an altered cell envelope can be obtained using known methods, such as, for example, mutagenesis methods using nitrosoguanidine. Examples of different types of leaky mutants are from Anderson, Wilson and Oxender in J. Bacteriol., 140 (1979), 351-358, and Fung, MacAlister and Rothfield in J. Bacteriol., 133 (1978), 1467-1471 described.
  • leaky mutants as host cells for the nucleic acid encoding the active substance SLPI therefore offers the particular advantage that the expressed SLPI protein is released into the environment, that is to say the intestinal epithelium of the IBD patient.
  • spheroblasts, L-forms or protoblasts of gram-negative or gram-positive host bacteria or of fungal host cells can be used.
  • Bacterial spheroblasts are cells obtained by treating gram-negative bacteria with lysozyme.
  • Bacterial protoblasts are cells that are obtained by treating gram-positive bacteria with lysozyme.
  • Spheroblasts can also be obtained with treatment with penicillin or lysozyme-EDTA.
  • L-forms of gram-negative or gram-positive bacteria are characterized by the fact that they have lost the ability to form a functional cell wall.
  • Methods for obtaining bacterial L-forms are, for example, from Makemson and Darwish, Infect. Immun., 6 (1972), 880.
  • Spheroblasts can also be obtained from yeast cells using well-known methods.
  • the nucleic acid encoding SLPI or a fragment or derivative thereof contained in the non-pathogenic microorganism is inserted in a vector.
  • the term “vector” means an extrachromosomal DNA, which is preferably a plasmid, a cosmid, a bacteriophage, a virus, a shuttle vector and another commonly used in genetic engineering Vector acts.
  • the vectors according to the invention can have further functional units which stabilize, select and / or replicate the vector in one Effect or at least contribute to the host organism.
  • the vector used according to the invention for inserting SLPI sequences does not contain a selection marker which is based on antibiotic resistance. Otherwise, since the host cell into which the vector for the expression of the active ingredient is introduced should colonize the bowel of a IBD patient in a stable manner, there would otherwise be a risk that antibiotic resistance contained on the vector would be passed on to the other germs of the intestinal flora and can thus spread within the intestinal flora.
  • the selection marker contained on the vector in a preferred embodiment is a gene whose gene product is not harmful to the human or animal organism and which can be easily detected.
  • the selection marker contained on the vector is a sequence coding for the "green fluorescent protein” (GFP), the GFP product being detected, for example, by means of FACS or flow cytometry.
  • GFP green fluorescent protein
  • Invention is the nucleic acid encoding the active substance SLPI or a fragment or derivative thereof inserted into a vector so that it is under the is functional control of at least one regulatory element that ensures the transcription of the nucleic acid into a translatable RNA and / or the translation of the RNA into a protein before, during or after the administration.
  • Regulatory elements can be, for example, promoters, ribosome binding sites, signal sequences and / or transcription termination signals.
  • Regulatory elements that are operably linked to a nucleic acid encoding SLPI or a fragment or derivative thereof can be nucleotide sequences derived from organisms or genes other than the nucleotide sequence encoding SLPI itself.
  • the promoter used can be a constitutive or inducible promoter.
  • a promoter is the area of DNA to which the enzyme RNA polymerase binds and initiates the process of gene transcription.
  • a "constitutive promoter” is a non-regulable promoter which continuously causes the transcription of a coding DNA sequence without external stimulus.
  • An “inducible promoter” is a controllable promoter that is activated directly by the presence or absence of a chemical agent or indirectly by a stimulus from the environment such as a change in temperature.
  • a constitutive promoter has a disadvantage compared to an inducible promoter in that an uncontrolled expression of a foreign protein, for example in a bacterial rial host cell, can lead to the death of these host cells.
  • an inducible promoter for expressing the SLPI-encoding nucleic acid is therefore provided in particular.
  • an inducible promoter is used which is inducible due to a lack of nutrients.
  • a nutrient-deficient promoter is activated when the concentration of a chemical agent that is necessary for maintaining cell functions is greatly reduced or completely absent.
  • Such a promoter is particularly suitable for the specific growth conditions with which germs are confronted in the intestine. In the intestine, the nutrient supply to the germs is subject to extremely strong fluctuations. The growth conditions in the intestine are therefore often described as "feast or family".
  • the transcription of the SLPI-encoding nucleic acid is induced by the inducible promoter used according to the invention.
  • the SLPI protein subsequently formed can diffuse relatively freely to the intestinal epithelium after being expelled from the host cell used according to the invention, since the intestine contains little or no chyme.
  • E. coli. (Nissle 1917), an inducible promoter is used, which is induced by a lack of phosphate.
  • the promoter used is the phoA promoter from Escherichia coli. If the vector contains the phoA promoter, it preferably also includes the regulatory genes phoB and phoR in order to be able to switch the promoter on and off efficiently.
  • the promoters used for active ingredient expression in a Gram-negative host bacterium are the trp, lac or tac promoters of Escherichia coli. In principle, the E. coli promoters can also be used in gram-positive bacteria.
  • an inducible promoter is used to express the SLPI-encoding nucleic acid in a yeast cell, for example Saccharomyces bulardii, which is induced by a phosphate deficiency.
  • the promoter used is the promoter of the yeast gene PHO 5.
  • the promoter of the ADH 1 gene of the yeast is used to express the SLPI-encoding nucleic acid in a yeast cell that is induced by glucose deficiency.
  • the nucleic acid coding for SLPI ' for expression is placed under the functional control of a ribosome binding site in a bacterial host cell.
  • ribosome binding site understood a sequence that is complementary to the 3 'end of the bacterial 16S rRNA and is used for binding ribosomes.
  • Ribosome binding sites are usually located 3 to 12 bases in front of an initiation codon, usually comprising 3 to 9 bases.
  • the ribosome binding site used is a Shine-Dalgarno sequence with the consensus sequence 5 '-AAGGAGGU-3'.
  • the nucleic acid coding for SLPI is connected for expression in a host cell according to the invention with a signal sequence suitable for the respective host, that is to say with a bacterial or fungal signal sequence.
  • a "signal sequence” is a sequence that encodes a signal peptide that causes secretion of a protein from the cytoplasm of a microorganism into the periplasmic space or into the environment of the microorganism.
  • the signal peptide is a short segment of about 15 to 30 amino acids that is located at the N-terminus of secreted and exported proteins.
  • the cellular machinery of the host cell for processing proteins recognizes this signal sequence, so that the expressed protein is secreted through the cell membrane or through the membrane of an organelle, the signal peptide being removed during the secretion process by a specific protease.
  • SLPI is a protein normally secreted by a eukaryotic organism
  • the natural signal peptide of the native SLPI protein is invented. in accordance with the invention is replaced by a signal peptide suitable for the respective host cell, so that the transport out of the host cell into the periplasmic space or the environment of the host cell is ensured.
  • the signal sequence of the ⁇ -lactamase gene from E. coli or the signal sequence of the ompA gene of E. coli is used to achieve secretion of the expressed ' n SLPI protein into the periplasmic space and / or the surroundings.
  • hybrid signal sequences for example the sequence described by Konrad, Annuals New York Academy of Sciences, 413 (1983), 12-22), which results from a fusion of the first twelve amino acids of ⁇ -lactamase Signal sequence with the last 13 amino acids of the human insulin signal sequence.
  • nucleic acid encoding SLPI ⁇ in a gram-positive host bacterium such as Streptococcus gordonii
  • the signal sequence of ⁇ -amylase gene of Bacillus amyloliquefaciens or the - signal sequence of the Streptococcus gene M6 is used to a.
  • the signal sequence of ⁇ -amylase gene of Bacillus amyloliquefaciens or the - signal sequence of the Streptococcus gene M6 is used to a.
  • the signal sequence of the ⁇ -factor of yeast or the signal sequence of the killer toxin of yeast are used in order to secrete the expressed SLPI - To reach protein through the cell envelope into the environment.
  • the living microbial host cell capable of SLPI expression which contains the nucleic acid coding for SLPI inserted into a vector, is administered in a pharmaceutical composition to a CED patient.
  • the pharmaceutical composition contains sufficient colony-forming units (CFU) of the host cells capable of SLPI formation, so that the state of the chronic inflammatory bowel disease, the progression, is cured when the pharmaceutical composition according to the invention is administered to a CED patient several times the inflammatory bowel disease can be stopped and / or the symptoms of the inflammatory bowel disease can be alleviated.
  • a pharmaceutical composition contains 1 x 10 8 - 1 x 10 11 , preferably 1 x 10 9 - 1 x 10 10 CFU of the host cells according to the invention.
  • the pharmaceutical composition which is used for Microorganism capable of SLPI formation is administered one to three times a day over a period of two to four weeks.
  • the exact dosage depends, among other things, on the dosage form, the age, gender and body weight of the patient to be treated and the severity of the disease and must be determined individually by the treating doctor.
  • the pharmaceutical composition which contains the living microbial host cell according to the invention is preferably an oral dosage form.
  • the pharmaceutical composition to be administered orally can have a liquid or solid form.
  • the pharmaceutical composition can, for example, be administered orally in the form of a suspension, tablet, pill, capsule, granulate or powder.
  • the live product according to the invention lies in a liquid pharmaceutical composition.
  • Microorganism preferably free and not immobilized in suspension before.
  • the suspension has a composition which ensures physiological conditions for the microorganism, so that in particular the osmotic pressure inside the cell does not lead to lysis of the cell.
  • a liquid pharmaceutical composition is particularly suitable for microorganisms, in particular bacteria, with an intact cell envelope.
  • the microorganisms used according to the invention can be composed in free, preferably lyophilized, Form or in immobilized form.
  • the microorganisms according to the invention can be enclosed in a gel matrix which gives the cells physical protection.
  • Inclusion in a gel matrix is particularly suitable for microorganisms in which the outer membrane has been completely or partially removed, that is to say for leaky mutants, spheroblasts, protoblasts or L-forms.
  • Such microbial forms are very fragile and the inclusion in the gel matrix ensures that the cells are protected against mechanical shear forces.
  • microorganisms according to the invention for example bacteria
  • a gel matrix by mixing a concentrated cell solution with a dissolved gelling agent and then passing the mixture through needles with a small diameter. Drops are formed which then fall into a solution which causes the gelling agent to gel and thus the formation of polymerized particles. Examples and modifications of this method are in Brodelius and Mosbach, Adv. Appl. Microbiol., 28 (1982), 1-25, and Klein, Stock and Vorlop, Eur. J. Appl. Microbiol. Biotechnol., 18 (1983) 86-91.
  • Substances which can be used as a matrix for the inclusion of microorganisms include agar, alginates, carrageenan, agarose or other polymers which are physiologically suitable for humans or animals and which can gel under physiological conditions.
  • Other forms of cell immobilization include the adsorption of the microbial host cells according to the invention on solid supports or the immobilization of the host cells according to the invention via covalent bonds. These methods are described in Navarro and Durand, Eur. J. Appl. Microbiol. Biotechnol., 4 (1977), 243.
  • Immobilization of bacteria according to the invention can also be achieved by enclosing the cells between membranes whose pores are smaller than the bacteria themselves, but large enough to allow the expressed SLPI proteins to be transported through the membrane.
  • Such devices are well known and commercially available (e.g. Amicon, Millipore and Dorr-Olivier).
  • a solid pharmaceutical composition intended for oral administration which contains the host cells according to the invention in immobilized or non-immobilized form, is preferably provided with an enteric coating. This ensures that the living microorganisms contained in the pharmaceutical composition can pass through the stomach unhindered and undamaged and that the microorganisms are only released in the upper intestinal areas.
  • the pharmaceutical composition containing the living host cells of the invention is administered rectally.
  • Rectal administration is preferably in the form of suppository, klysmas or foam. Rectal administration is particularly suitable for IBD diseases that affect the lower sections of the intestine, for example the large intestine.
  • the present invention therefore also relates to a pharmaceutical composition
  • a pharmaceutical composition comprising at least one living cell of a non-pathogenic microorganism capable of SLPI formation, which contains an expressible nucleic acid encoding the active ingredient SLPI or a fragment or derivative thereof, the non-pathogenic microorganism preferably is a commensal or a component of the natural human or animal intestinal flora and / or can be used for the fermentative production of food.
  • the pharmaceutical composition contains an anaerobic or aerobic, gram-negative or gram-positive bacterium of the natural human or animal intestinal flora.
  • the microorganism contained in the pharmaceutical composition is a commensal yeast from humans or animals.
  • the microorganism contained in the pharmaceutical composition is a bacterium that can be used for the fermentative production of foods.
  • the pharmaceutical composition contains a "leaky" mutant of a non-pathogenic microorganism.
  • the pharmaceutical composition contains cells of the non-pathogenic Escherichia coli strain Nissle 1917.
  • the pharmaceutical composition contains cells of the commensary bacterium Streptococcus gordonii.
  • the pharmaceutical composition contains cells of the communal yeast Saccharomyces boulardii.
  • a particularly advantageous embodiment relates to a pharmaceutical composition in which the microorganism contains a nucleic acid encoding the active ingredient SLPI or a fragment or a derivative thereof, the nucleic acid being inserted in an expression vector and the expression of the nucleic acid being under the control of at least one
  • the regulatory element is such that the active ingredient is expressed before, during or after the administration of the pharmaceutical composition to a human or an animal and is released to the organs of the digestive tract after the administration of the pharmaceutical composition.
  • the present invention therefore also relates to methods for manufacturing a pharmaceutical 'composition comprising:
  • Host cell the host cell being a commensal of humans or animals or a natural component of the human or animal intestinal flora and / or can be used for the fermentative production of foods;
  • a nucleic acid encoding the active substance SLPI can be isolated with the aid of methods usually used in genetic engineering (cf. Sambrook et al., Molecular Cloning: A Laboratory Manual, 2nd edition (1989), Cold . Spring Harbor Laboratory Press, NY, USA ). There . the DNA sequence of the human SLPI gene is known. (see US Pat. No. 5,851,983 and US Pat. No. 6,132,990) / can SLPI coding sequences, for example from a eukaryotic Tissues, preferably a mammalian tissue, more preferably a human tissue, can be amplified and isolated with suitable primers using the method of polymerase chain reaction (PCR). Amplification using a cDNA library of human tissue is particularly preferred.
  • PCR polymerase chain reaction
  • the primers are preferably designed in such a way that the coding SLPI sequence is provided with suitable restriction cleavage sites at the 5 'and 3' ends.
  • the amplification product is cleaved with suitable restriction enzymes and, after purification, for example using gel electrophoresis, is cloned into a suitable vector.
  • the SLPI coding sequence can be produced synthetically.
  • the chemical synthesis of the nucleic acid offers the advantage that the nucleic acid sequence can be modified, for example with regard to the codon use, without changing the amino acid sequence of the encoded protein.
  • DNA sequences can be synthesized, for example, using the phosphotriester method or the phosphite method, for example on solid phase systems. The synthesis is preferably carried out using DNA synthesis devices, for example DNA synthesizers from Applied Biosystems. After the synthesized sequence has been purified, it is inserted into a vector using suitable methods.
  • Nucleic acid sequence in a suitable vector is done using methods commonly used in the art, for example restriction cleavage and ligation.
  • a suitable vector must generally have the following properties:
  • the vector must be able to double during cell division so that all offspring receive at least one copy of the vector.
  • Suitable vectors for gram negative or gram positive host cells or yeast host cells are known in the art.
  • the vector which is used according to the invention for cloning the SLPI-encoding nucleic acid does not contain a selection marker based on antibiotic resistance, but preferably a marker such as a gene sequence encoding the GFP protein, the gene product of which by means of FACS or Flow cytometry is easily detectable.
  • the vector preferably also already contains an ex- compression cassette with a suitable promoter, a suitable ribosome binding site, a suitable signal sequence and suitable transcription termination sequences.
  • the construct After insertion of the SLPI-encoding nucleic acid into a suitable vector, the construct is introduced into a bacterial host or a yeast host. If the vector is a bacteriophage, it can be introduced into the host by transduction (see Sambrook et al., 1989). If the vector used is a plasmid, this can be introduced into the host, for example by means of a transformation process. The usual calcium transformation process is preferably used for Escherichia coli strains (cf. Sambrook et al., 1989). Transformation methods for Streptococcus cells are described, for example, in Clewell, Microbiol. Rev., 45 81984), 409. Transformation methods for fungal host cells, such as yeast host cells, are also well known in the art.
  • transformed host cells are grown in a suitable medium under suitable conditions and expanded until a suitable cell density is reached.
  • the host cells are then suspended in a-sterile physiological solution in an appropriate cell density.
  • the cultivated host cells can also be ⁇ known Process lyophilized or immobilized. After lyophilization or immobilization, the cells are mixed in a suitable CFU (colony-forming unit) with substances such as pharmaceutically questionable exipients, stabilizers, thickeners, release agents, lubricants, dyes, odorants, flavorings, emulsifiers or similar pharmaceutically used substances, to produce a desired pharmaceutical composition.
  • CFU colony-forming unit
  • the present invention relates not only to the aforementioned uses of the active ingredient or a microorganism capable of forming an active ingredient for the treatment of a disease defined above, but also to the use of an active ingredient defined above or a microorganism capable of forming this active ingredient for the manufacture of a pharmaceutical preparation for the treatment of a disease Disease of a human or animal body selected from the group of inflammatory bowel diseases which have been defined in more detail above.
  • FIG. 1 shows the immunostaining of a histological intestinal section of a healthy patient using a rabbit antibody specifically directed against human SLPI.
  • Figure 2 shows the immunostaining of a histological intestinal section of a IBD patient using of a rabbit antibody specifically directed against human SLPI.
  • Intestinal tissue samples from healthy and diseased patients were obtained endoscopically and immediately transferred to embedding medium for frozen sections (OCT, Miles Scientific) and then frozen in liquid nitrogen. Frozen sections were made from the samples embedded in this way and stained immunohistologically.
  • the frozen sections produced in this way were air-dried overnight and then fixed for 10 min with acetone-methanol-formaldehyde (AMF) at room temperature.
  • the frozen sections were then washed three times with Tris-HCl buffer, pH 7.4-7.6, each for 5 minutes.
  • the sections were then blocked with serum for 30 minutes.
  • the sections were then incubated with a first antibody (polyclonal rabbit antibody which was directed against human SLPI) at a dilution of 1: 1000 to 1: 2000 at 37 ° C. for 1 hour.
  • the cells of the intestinal mucosa of healthy test subjects are colored intensely (in the original photo: red).
  • This intense red color shows that SLPI is present in very large quantities in the intestinal mucosa of healthy subjects.
  • the cells of the intestinal mucosa of IBD patients are hardly stained (see FIG. 2).
  • This slight staining shows that the amount of SLPI in the intestinal mucosa of IBD patients is greatly reduced compared to the intestinal mucosa of healthy volunteers.
  • This observed sharp decrease in the amount of SLPI in the intestinal mucosa of IBD patients is an indication of the suitability of SLPI for the treatment of inflammatory bowel diseases.

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