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Method for improving the half-life of soluble viral receptors on mucosal membranes

a technology of soluble viral receptors and mucosal membranes, which is applied in the direction of immunoglobulins against bacteria, pill delivery, antibody ingredients, etc., can solve the problem of geometric distortion of some viral particles and disrupt the growth of some viral particles

Inactive Publication Date: 2002-07-04
OSEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After binding to soluble viral-specific ligands immobilized onto a rigid bacterial cell wall, disruption of some viral particles will occur due to geometric distortion to the viral particle.

Method used

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  • Method for improving the half-life of soluble viral receptors on mucosal membranes
  • Method for improving the half-life of soluble viral receptors on mucosal membranes

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0140] ICAM-SPA.sub.CWT (genetic fusion)

[0141] The polypeptide comprising ICAM-1 domains 1 and 2 (the minimal receptor for human rhinovirus, HRV, major group (see, e.g., Casasnovas, J. M. and Springer, T. A., Journal of Virology 68, 5882-5889 (1994); Casasnovas, J. M., et al., Journal of Virology 72, 6244-6246 (1998)) is expressed as a fusion protein with the C-terminal domain of lysostaphin, SPA.sub.CWT (see, e.g., Baba, T. and Schneewind, O., EMBO J. 15, 4789-4797 (1996) and Baba, T. and Schneewind, O., EMBO J. 17, 4639-4646 (1998)), to target this chimeric molecule to the surface of Staphlyococcus aureus. The DNA fragments coding for domains 1 and 2 of ICAM-1 and SPA.sub.CWT are amplified using polymerase chain reaction (PCR) with primers designed to introduce in-frame EcoRI restriction sites flanking residues 1-168 of ICAM-1 and residues 389-480 of lysostaphin (SPA.sub.CWT). These fragments are ligated together and placed into a mammalian expression cassette for expression in ma...

example 2

[0144] Sialic acid-scFv specific for peptidoglycan (chemical linkage)

[0145] Sialic acids (Fluka Chemicals LTD, Switzerland) are chemically linked to single-chain variable antibody fragments (scFv) specific for peptidoglycan (the major constituent of the cell wall of all gram-positive bacteria). This conjugation is carried out using one of several hetero-bifunctional crosslinkers, such as ABH or MPBH (Pierce Inc. USA).

[0146] ABH consists of a hydrazide group that reacts with the cis-diol moiety in sialic acid, and a photoazide end that reacts non-specifically with scFv upon UV photolysis. Like ABH, MBPH contains a hydrazide group that reacts with the cis-diol moiety in sialic acid. However, instead of a non-specific photoazide group, MBPH contains a maleimide group that reacts specifically with the --SH group in scFv, forming a thioether linkage upon coupling.

[0147] After conjugation, sialic acid-linked scFv products are extensively purified away from unconjugated material using affi...

example 3

[0149] CD4-scFv specific for S-proteins (biotin-avidin linkage)

[0150] A number of gram-positive and gram-negative bacteria synthesize S-layer proteins, which autoaggregate into an S-layer surrounding the bacterial surface. A number of lactobacillus strains on the vaginal flora produce S-layer proteins. ScFv specific for S-layer proteins are linked to CD4, the receptor for HIV, using biotin-avidin crosslinking. A 15-amino acid peptide (BSP for biotin substrate peptide), the substrate for the enzyme BirA, is genetically fused to the COOH-terminus of the scFv and domains 1 and 2 of CD4 using the method described by Altman et al. (Science 274, 94-96 (1996)). Briefly, DNA coding for a GlySer linker and BSP are fused to the 3' end of the DNA fragments coding for the scFv and domains 1 and 2 of CD4. BSP-containing proteins are expressed in CHO cells as in example 1 and then biotinylated specifically on the lysine residue of BSP using the enzyme BirA. Alternatively, unmodified CD4 (domains ...

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Abstract

This invention relates to methods of increasing the half-life of a viral-specific ligand on a mucosal membrane by modifying the viral-specific ligand to bind the bacteria colonized on the mucosal membrane. The invention also provides a chimeric molecule comprising a viral-specific ligand and a bacterial-specific ligand.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS[0001] This application claims the priority of U.S. Provisional Application No. 60 / 129,722, filed on Apr. 16, 1999, the disclosure of which is hereby incorporated by reference.STATEMENT AS TO RIGHTS TO INVENTIONS MADE UNDER FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT[0002] Not applicable.[0003] The use of soluble viral receptors to prevent viral infection is being actively pursued. Amongst these efforts, intranasal administration of soluble ICAM-1 is being tested to prevent rhinovirus (cold) infection (Boehringer Ingelheim and Bayer). Soluble viral receptors are designed to work by engaging all host binding sites of a virus, thereby leaving none for the virus to attach to its target cell. However, a single viral particle has numerous binding sites for the host cell on its surface, e.g. rhinovirus has 60. Soluble viral receptors must simultaneously coat all binding sites on the virus to render it non-infectious. This requires an extremely high...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K9/00A61K9/06A61K9/08A61K9/10A61K9/12A61K9/14A61K9/02A61K9/20A61K9/48A61K31/727A61K38/00A61K38/17A61K39/395A61K45/00A61P31/12C07K16/12C07K16/14C07K17/10C07K19/00
CPCA61K9/0043A61K38/177A61K2039/505C07K16/12C07K16/1267C07K2317/622A61K38/164A61K38/1774A61K38/4886A61K2300/00A61P31/12Y02A50/30
Inventor LEE, PETER P.
Owner OSEL
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