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Immunomodulating polymers

a polymer and immunomodulator technology, applied in the field of immunomodulators and methods, can solve the problems of recurring sepsis in patients, time-consuming and costly procedures, and prolonged hospitalization, and achieve the effects of reducing postoperative surgical adhesion formation, promoting allograft survival, and suppressing the igg antibody respons

Inactive Publication Date: 2006-07-13
THE BRIGHAM & WOMEN S HOSPITAL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to methods and products for inducing IL-2 secretion, activating T cells, promoting allograft survival, preventing abscess formation, and reducing postoperative surgical adhesion formation. The invention involves the use of an immunomodulator that is a polymer with at least two repeating charge motifs. The polymer has a repeating charge motif composed of a positively charged free amino moiety and a negative charge, which are separated by at least a minimum distance of at least 10 amino acid residues. The polymer can be a natural or synthetic polymer, and it can have modified amino acids. The invention also includes pharmaceutical compositions containing the polymer. The technical effects of the invention include inducing immune-specific responses, promoting allograft survival, preventing abscess formation, and reducing postoperative surgical adhesion formation.

Problems solved by technology

If the abscess is left untreated, it may cause fever, prolonged hospitalization, and in some cases mortality.
If the abscess ruptures, it will release its bacterial contents into the peritoneal cavity, which can in turn lead to recurring sepsis in these patients.
However, once an abscess has formed, the major course of action is further surgical intervention to drain the offending abscess, a time-consuming and costly procedure.
It has been impractical to immunize patients against abscess formation such as in the case of intraabdominal surgery because there simply are too many strains of bacteria capable of causing abscess formation, and protection against one would not confer protection against another.
It furthermore is unsettled whether vaccination and consequent induction of an immune response would confer adequate protection against abscess formation by any particular bacterium.
There also exist problems and dangers associated with administering live or attenuated strains of bacteria to humans, further discouraging efforts to produce vaccines containing a large number of different bacteria.
Although many polysaccharides have been shown to be immunogenic, some are only weakly immunogenic at best.
Surgical adhesions within the abdomen are associated with a high morbidity rate and can be fatal.
They can result in bowel obstruction and organ failure.
These methods remain cumbersome for the surgeon.

Method used

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Examples

Experimental program
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Effect test

example 1

Sources of Bacteria Isolation and Modification of Polysaccharides and Animal Model for Intraabdominal Sepsis

[0155]B. fragilis NCTC 9343 and ATCC 23745 were originally obtained from the National Collection of Type Cultures (London, England) or the American Type Culture Collection (Bethesda, Md.). Microorganisms were stored at −80° C. in peptone-yeast or brain heart infusion broth until used, and grown anaerobically as previously described. Pantosti et al. Infect Immun 59:2075 (1991). The CPC from B. fragilis NCTC 9343 or ATCC 23745 was isolated by hot phenol / water extraction and subsequent purification of PS A performed as previously described. Tzianabos, A et al. J Biol Chem 267:18230 (1992).

[0156] The S. pneumoniae type 1 capsular polysaccharide (CP) and other pneumococcal polysaccharides were obtained from the ATCC (MD).

[0157] Chemical modifications of polysaccharides to produce molecules with altered charges have been described previously. Taylor, R et al. Biochemistry 11:1383...

example 2

T Cell Activation by PS A Depends on Charge Motif

[0160] The ability of B. fragilis PS A to elicit a protective host response that is dependent on T cells suggested an interaction between PS A and this cell type. Thus experiments were performed to determine whether PS A activates T cells in vitro.

[0161] T cell proliferation assays were performed on cells obtained from human leukopacs (discarded white cells from anonymous platelet donors). Mononuclear cells were separated by ficoll-hypaque sedimentation to eliminate red cells and polymorphonuclear leukocytes. The mononuclear layer, which consisted of T cells, B cells, and mononuclear cells, was depleted of B cells and monocytes by passage over nylon wool column. A portion of these cells was saved prior to placement on nylon wool and were used as autologous feeder cells following irradiation with 6.4 krads with a cesium source for 4.8 min. Nylon passed cells, which were greater than 98% CD3 positive (as determined by FACS analysis) w...

example 3

Characterization of Zwitterionic Polymer Charge Motif Responsible for T Cell Activation

[0167] This example examines whether another bacterial polysaccharide with a charge motif similar to PS A could activate T cells in vitro. Streptococcus pneumoniae type 1 capsular polysaccharide (CP) is among the few naturally occurring polysaccharides that have oppositely charged groups. Lindberg, B et al. Carbohydr Res 78:111 (1980). The type 1 CP is a trisaccharide repeating unit that has the same sugar residue with a positively charged free amino group (2-acetamido-4-amino-2,4,6-trideoxygalactose residue) that occurs in PS A. In addition, the type 1 CP has two galacturonic acid residues containing negatively charged carboxyl groups per repeating unit. In previous studies, we have demonstrated that like PS A, the type 1 CP also protects animals against abscess formation. Tzianabos, A O et al. Infect Immun 62:4881 (1994). In addition, this protective activity is also dependent on the presence o...

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Abstract

Methods and products for inducing IL-2 secretion, inducing IL-10 secretion, activating T cells, suppressing IgG antibody response to specific antigen, promoting allograft survival, reducing postoperative surgical adhesion formation, and protecting against abscess formation associated with surgery, trauma or diseases that predispose the host to abscess formation are provided. The methods of the invention are accomplished using an immunomodulator which is a polymer having at least two repeating charge motifs separated by at least a certain minimum distance.

Description

RELATED APPLICATIONS [0001] This application is a divisional of, and claims priority under 35 U.S.C. § 120 to, currently pending U.S. patent application Ser. No. 09 / 540,024, filed on Mar. 31, 2000, the entire contents of which are incorporated herein by reference, and which claims benefit under 35 U.S.C. § 119(e) of U.S. Provisional Patent Application No. 60 / 127,584, filed Apr. 2, 1999, and to U.S. Provisional Patent Application No. 60 / 162,457, filed Oct. 29, 1999, the entire contents of which provisional applications are hereby incorporated by reference.GOVERNMENT SUPPORT [0002] The present invention was supported in part by a grant from the United States National Institutes of Health AI 34073 and AI 39576. The U.S. Government may retain certain rights in the invention.FIELD OF THE INVENTION [0003] The present invention relates to immunomodulators and methods for modulating an immune response. The invention also relates to methods for activating T cells, inducing IL-2, protecting a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K39/395A61K31/715A61K31/785A61K35/74A61K35/742A61K38/00A61K38/20A61K45/06
CPCA61K31/715A61K31/785A61K38/00A61K45/06A61K35/742
Inventor TZIANABOS, ARTHURKASPER, DENNISONDERDONK, ANDREWWANG, YING
Owner THE BRIGHAM & WOMEN S HOSPITAL INC
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