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Method for treatment of diarrhea disease and removing special bacterial population

A treatment method, disease technology, applied in the field of treatment of diarrheal diseases and removal of specific bacterial populations from the colon, which can solve problems such as untreatable, infection, etc.

Inactive Publication Date: 2000-08-23
AMBI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current use of vancomycin is seriously problematic because vancomycin (especially the oral form) has selected for a new class of highly resistant intestinal microorganisms (named vancomycin-resistant enterococci (VRE)). , and VRE can cause fatal untreatable infections elsewhere in the body

Method used

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  • Method for treatment of diarrhea disease and removing special bacterial population
  • Method for treatment of diarrhea disease and removing special bacterial population
  • Method for treatment of diarrhea disease and removing special bacterial population

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1a

[0028] Activity of nisin against Clostridium difficile

[0029] Twenty clindamycin-resistant clinical isolates from McGuire US Veterans Administration Hospital in Richmond, Virginia were tested anaerobically on Brucella agar containing goat blood. MIC (Minimum Inhibitory Concentration) is defined as the lowest concentration tested that completely inhibits the visible growth of bacteria.

[0030] As shown in Table 1, all strains were inhibited by nisin at a concentration of 0.25 μg / ml or less.

[0031]The susceptibility of 60 clinical isolates obtained from the Hospital of the University of Florence (Italy) to nisin and to antimicrobial agents currently used in the treatment of Clostridium difficile diarrhea and colitis was tested by the same method as previously described. As shown in Table 2, the median MIC of nisin to these strains is the MIC 50 (The concentration that inhibits the growth of 50% or more of the tested strains) was 0.05 μg / ml, significantl...

Embodiment 1b

[0034] Nisin lacks activity against Bacteroides fragilis

[0035] Nine isolates of B. fragilis from McGuire US Veterans Administration Hospital in Richmond, Virginia were tested in the same manner as previously described. Even at the highest nisin concentration used (32 μg / ml), none of the strains were inhibited. Therefore, the MIC of nisin against these strains was above 64 μg / ml. Likewise, as shown in Table 3, 23 isolates from the Hospital of the University of Florence (Italy) were also less sensitive to nisin; the median MIC value was greater than 128 μg / ml.

[0036] This example shows that nisin is unlikely to disrupt the normal flora of the human intestine. It also showed that the activity of nisin alone against complex nutrient-requiring Gram-negative bacteria was not predictable from existing data on other species.

[0037]

[0038] compound

[0039] compound

[0040] All MIC values ​​are expressed in μg / ml. Mic 50 a...

Embodiment 2

[0042] Tolerability of Nisin in Ligated Intestines of Rabbits

[0043] Five rabbits were anesthetized and kept asleep throughout the experiment. The laparotomy was performed, and a section of bowel including the ileo-cecum junction and proximal colon was ligated. Two rabbits were used as controls, and 20 mg of nisin (obtained from the manufacturer) was directly injected into the ligated intestines of the other three rabbits. Rabbits were kept for 6 hours and then slaughtered.

[0044] No signs of irritation or toxicity due to nisin treatment were found at autopsy and on histopathological examination of exposed areas of the intestine. This example shows that a single administration of nisin to the colon of rabbits at doses similar to those likely to be administered to humans does not cause any local toxicity, even when the colon is ligated to artificially maintain the dose in the colon for 6 hours.

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Abstract

The invention is directed to methods of treating diseases brought on by infection of the colon by C. difficile and also by colonization of vancomycin-resistant enterococci; the methods employ nisin and other lanthionine-containing bacteriocins (lanthocins) as active agents.

Description

[0001] References to related applications [0002] This application claims the benefit of US Provisional Patent Application No. 60 / 049,236, filed June 9, 1997, under 35 CFR § 119(e). Background of the invention [0003] Nisin (nisin) is a bacteriocin produced by food-grade microorganisms. It is an antimicrobial substance and belongs to a group of similar substances known as lantibiotics (lanthocin), which also includes subtilisins, epidermins, gallidermin, pep5. [0004] Nisin is produced by Lactococcus lactis subsp. lactis belonging to Lancefield serogroup N [A.T.R. Mattick and A. Hirsch, 1947 Lancet. 2, 5]. Nisin is a peptide consisting of 34 amino acid residues containing 5 ring structures cross-linked by thioether bridges forming lanthionine or β-methyllanthionine residues. These thioethers are formed by condensation of the sulfhydryl group of cysteine ​​with the dehydrogenated side chain formed by serine or threonine res...

Claims

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Application Information

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IPC IPC(8): A61K38/00A61K9/20A61K9/28A61K38/16A61P1/00A61P1/10A61P31/04
CPCA61K38/164A61K9/2077A61K9/2846A61K9/2009A61P1/00A61P1/10A61P1/12A61P31/04
Inventor B·P·戈登斯坦
Owner AMBI
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