Assays for TIMP2 having improved performance in biological samples

• US 10,457,744 B2
• Filed: 01/29/2018
• Issued: 10/29/2019
• Est. Priority Date: 08/07/2013
• Status: Active Grant

• Current Assignee: Astute Medical, Inc. (Compagnie Merieux Alliance SAS)
• Original Assignee: Astute Medical, Inc. (Compagnie Merieux Alliance SAS)
• Inventors: Vijayendran, Ravi A., Venkatasubbarao, Srivatsa
• Primary Examiner(s): Cheu, Changhwa J
• Application Number:
  US15/882,936
• Publication Number:
  US 20180162953A1
• Time in Patent Office: 638 Days
• Field of Search: None
• CPC Class Codes: C07K 16/38 against protease inhibitors of peptide structure
• CPC Class Codes: C07K 2317/34 Identification of a linear epitope shorter than 20 amino acid residues or of a conformational epitope defined by amino acid residues
• CPC Class Codes: G01N 2333/8146 Metalloprotease (E.C. 3.4.24) inhibitors, e.g. tissue inhibitor of metallo proteinase, TIMP
• CPC Class Codes: G01N 33/577 involving monoclonal antibodies binding reaction mechanisms characterised by the use of monoclonal antibodies; monoclonal antibodies per se are classified with their corresponding antigens; G01N33/53 - G01N33/576 take precedence

Abstract

The invention provides TIMP2 immunoassays with improved clinical performance, particularly when used in the evaluation of renal injuries. The immunoassays rely on the selection and use of antibodies and antibody pairs that exhibit improved assay performance when used in complex clinical specimens such as biological fluids, and particularly when used in rapid assay formats such as lateral flow test devices.

Claims

1. An isolated rabbit monoclonal antibody which specifically binds human TIMP-2 protein, wherein the monoclonal antibody binds with an affinity of at least 10⁸ M⁻

1 to human TIMP-2 protein, and wherein the monoclonal antibody binds to residues within a sequence selected from the group consisting of;

2. An isolated rabbit monoclonal antibody according to claim 1, wherein the antibody is conjugated to a signal development element.

3. An isolated rabbit monoclonal antibody according to claim 1, wherein the antibody is immobilized on a solid support.

4. An isolated rabbit monoclonal antibody according to claim 1, wherein the antibody is provided as a reagent in a kit further comprising a disposable test device configured to generate a detectable signal related to the presence or amount of human TIMP-2 protein in a biological sample.

5. An isolated rabbit monoclonal antibody according to claim 4, wherein the disposable test device is a lateral flow test device.

6. An isolated rabbit monoclonal antibody according to claim 4, wherein the antibody is immobilized to a surface within the disposable test device.

7. An isolated rabbit monoclonal antibody according to claim 4, wherein the antibody is provided in a separate container from the disposable test device.

8. An isolated rabbit monoclonal antibody according to claim 4, wherein the kit further comprises a second antibody which specifically binds human TIMP-2 protein, and wherein the isolated rabbit monoclonal antibody and the second antibody form a sandwich complex with human TIMP-2 protein.

9. An isolated rabbit monoclonal antibody according to claim 4, wherein the kit further comprises a calibration to relate the detectable signal to a concentration of TIMP-2 protein.

10. An isolated rabbit monoclonal antibody according to claim 9, wherein the calibration is a calibration curve provided on an electronic memory device.

11. An isolated rabbit monoclonal antibody according to claim 1, wherein the isolated rabbit monoclonal antibody is provided as a reagent in an in vitro diagnostic.

12. An isolated rabbit monoclonal antibody according to claim 4, wherein the kit is configured to perform an assay method which provides a signal related to the presence or amount of human TIMP-2 protein in a biological sample, and wherein the minimum detectable concentration of TIMP-2 protein in the assay method is 10 ng/mL or less.