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Methods of treating lupus based on antibody affinity and screening methods and compositions for use thereof

a technology of antibody affinity and lupus, applied in the field of antibody-mediated pathologies, can solve the problems of relatively poor overall survival and treatment regimens

Inactive Publication Date: 2006-06-29
LA JOLLA PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0023] In another aspect, the invention provides kits comprising (1) a conjugate comprising (a) a non-immunogenic valency platform molecule and (b) two or more polynucleotides which specifically bind to an antibody from an individual which specifically binds to double stranded DNA; and (2) instructions for using the conjugate to detect affinity of the conjugate for anti-ds DNA antibodies from an individual.

Problems solved by technology

Although overall patient prognosis in SLE has improved, treatment regimens are not ideal and lupus nephritis continues to be associated with relatively poor overall survival (Seleznick et al.

Method used

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  • Methods of treating lupus based on antibody affinity and screening methods and compositions for use thereof
  • Methods of treating lupus based on antibody affinity and screening methods and compositions for use thereof
  • Methods of treating lupus based on antibody affinity and screening methods and compositions for use thereof

Examples

Experimental program
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Effect test

example 1

Inhibition of Binding of Anti-dsDNA Antibodies to DNA by LJP 394

[0172] After determining the presence of anti-ds DNA antibodies in patients using a Farr assay, a competitive Farr assay was used to measure the affinity of anti-dsDNA antibodies found in sera from patients with SLE to LJP 394. In addition, the assay was used to measure the affinity of anti-dsDNA antibodies found in sera from three animals models of SLE (BXSB mice, NZB×NZW F1 mice, and MRL / lpr mice).

[0173] The Farr assay used 125I-labeled recombinant dsDNA (Diagnostic Products Corporation, Los Angeles, Calif.) that was combined with the anti-dsDNA antibodies found in sera from patients with SLE or from the mouse models of SLE. Anti-dsDNA antibodies were obtained from serum samples of donors with SLE collected through a volunteer donor program. Blood samples were drawn, serum harvested, aliquots made, labeled, and stored frozen at −70° C. until used. In this assay, 25 μl of patient's serum was added to 75 μl of Tris bu...

example 2

Identifying SLE Patients by Affinity Assay

[0179] SLE patients were readily identified by measuring the binding affinity of sera from SLE patients to LJP 394 dsDNA epitope using the surface plasmon resonance assay described below. IgG fractions from 10 SLE patients serum samples and 10 normal patient serum samples were evaluated for binding to LJP 394 ds DNA epitope with a non-competitive direct affinity assay (BIACORE™; Piscataway, N.J.), as disclosed herein. FIG. 2 illustrates that the SLE samples all showed saturable binding to the epitope while normal samples showed low binding to the LJP 394 epitope and low specific binding.

example 3

Determination of Titer-Weighted Average Affinity of Antibodies for Conjugate and Response to Treatment with Conjugate

[0180] An assay using surface plasmon resonance was developed to directly measure a titer-weighted average affinity of antibodies from SLE patients for the conjugate LJP 394. Surface plasmon resonance is used to quantify the fractional saturation of antigen with antibody. This assay was adapted so that it measured the average affinity of the IgG population of LJP 394.

[0181] Materials and Methods

[0182] Reagents. Streptavidin CM5 chips, HBS buffer (0.01 M HEPES pH 7.4, 0.15 M NaCl, 3 mM EDTA and 0.005% (v / v) surfactant P20) were obtained from BIACORE AB (Piscataway, N.J.).

[0183] LJP 394 is composed of four 20-mer dsDNA epitopes that are covalently attached to a triethyleneglycol-based platform by a thiol linkage. The DNA epitope was composed of 5′-(CA)10-3′ strands annealed to complementary GT strands, with biotin attached at the free 5′ ends of the GT strand. Bioti...

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Abstract

The invention provides methods identifying individuals suitable for treatment for lupus and methods of monitoring treatment, based on measuring antibody affinities, as well as of treating lupus based on measuring antibody affinities. The treatment entails administration of a conjugate comprising a non-immunogenic valency platform molecule and at least two double stranded DNA epitopes, such as DNA molecules, which bind to anti-DNA antibodies from the patient.

Description

RELATED APPLICATIONS [0001] This application claims the priority benefit of U.S. provisional application Ser. No. 60 / 167,716, filed Nov. 28, 1999, which is incorporated by reference in its entirety.TECHNICAL FIELD [0002] This invention relates to the field of antibody-mediated pathologies such as lupus. More particularly, the invention relates to methods of treating individuals (and selecting individuals for treatment) for lupus based on antibody affinity. BACKGROUND ART [0003] Systemic lupus erythematosus (SLE) is an autoimmune disease characterized by the production of antibodies to a number of nuclear antigens, including double-stranded DNA (dsDNA). Autoantibodies that react with DNA are believed to play a role in the pathology of SLE and are closely associated with lupus nephritis. See, for example, Morimoto et al. (1982) J. Immunol. 139:1960-1965; Foster et al. (1993) Lab. Invest. 69:494-507; ter Borg et al. (1990) Arthritis Rheum. 33:634-643; Bootsma et al. (1995) Lancet 345:1...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K48/00G01N33/564A61K38/095A61K47/48A61P13/12A61P37/02C12N15/00G01N33/15G01N33/50
CPCA61K47/48092A61K38/00A61K47/549A61P13/12A61P37/02A61K47/50
Inventor LINNIK, MATTHEWMCNEELEY, PATRICIA
Owner LA JOLLA PHARMA
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