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Method and reagent for detecting cell death

a cell death and reagent technology, applied in the field of methods and reagents for detecting cell death, can solve the problems of complicated procedures, drawbacks in diagnosis in view of patient pain, and problems in and achieve the effect of superior sensitivity and quantitation performan

Inactive Publication Date: 2006-08-17
EISIA R&D MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach allows for accurate and early detection of cell death, particularly in GVHD, HPS, acute lymphatic leukemia, and influenzal encephalopathy, providing a diagnostic indicator for apoptosis-related diseases.

Problems solved by technology

However, such diagnosis suffers from drawbacks in view of patient's pain during the test, time required for diagnosis and operation procedures.
However, since DNA is extracted from a tissue or a cell population as a whole, it is said that this method has a problem in sensitivity and quantitation performance when the proportion of apoptotic cells is not high.
However, these methods have problems such as complicated procedures and poor sensitivity and quantification performance, and have not been currently used in practice as methods for diagnosing GVHD and HPS.

Method used

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  • Method and reagent for detecting cell death
  • Method and reagent for detecting cell death
  • Method and reagent for detecting cell death

Examples

Experimental program
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Effect test

example 1

Measurement of Cytochrome C by ELISA

[0043] Cytochrome C is measured by the following procedure.

1) Purification of anti-cytochrome C antibody

[0044] A rabbit is immunized with rat cytochrome C (Sigma) to obtain antiserum directed to cytochrome C. To the antiserum, ammonium sulfate is added at a final concentration of 2 M, and it is stirred at room temperature (20-30° C.) for 5 hours. The stirred solution is centrifuged at 10000 rpm for 30 minutes and the supernatant is discarded. The precipitation is dissolved in 0.1 M phosphate buffer (pH 7.2) and dialyzed against the same buffer. The dialyzed solution is applied to a column of a carrier obtained by binding bovine cytochrome C to CNBr-Sepharose 4B (Pharmacia). The column is washed with 0.01 M Tris-HCl buffer (pH 7.5) containing 0.15 M NaCl, and then anti-cytochrome C antibodies are eluted with 0.1 M guanidine hydrochloride. The eluted solution is dialyzed against 0.01 M Tris-HCl buffer (pH 7.5) containing 0.15 M NaCl to obtain p...

example 2

Quantitation of Cytochrome C in Sera of GVHD, HPS and Acute Lymphatic Leukemia Patients

[0051] Cytochrome C levels in sera of GVHD, HPS and acute lymphatic leukemia patients and normal subjects were measured by using the ELISA system for measuring cytochrome C described in Example 1.

[0052] As a result, as shown in Table 1, 15 normal subjects were all negative (<0.05 ng / ml), whereas 4 out of 6 GVHD patients were positive (67%), 4 out of 4 HPS patients were positive (100%) and 2 out of 2 acute lymphatic leukemia patients were positive (100%). Further, HPS patients having a high blood cytochrome C concentration tended to show poor course of the disease.

[0053] Clearly high determined values of cytochrome C were observed in sera of patients where apoptosis was considered to occur.

TABLE 1Determined values of cytochrome C in sera of GVHD,HPS and acute lymphatic leukemia patientsDetermined value of cytochrome CDiseasein serum (ng / ml)GVHD1.10.40.30.3HPS (including VAHS)3.122.038.02.9Acu...

example 3

Determination of Cytochrome C in Sera of Influenzal Encephalitis or Encephalopathy Patients

[0055] The amounts of cytochrome C in sera of influenza patients accompanied with high fever, heat cramp or encephalitis or encephalopathy were measured by using the ELISA system described in Example 1.

[0056] The results including those of multiple measurements for one patient are shown in FIG. 2. Among the cases accompanied with encephalitis or encephalopathy, all 27 specimens (8 cases) showed high values not lower than 5 ng / ml, and among these, 17 specimens showed high values not lower than 30 ng / ml. Further, patients having a high blood cytochrome C concentration tended to show poor course of the disease.

[0057] Some patients having repeated heat cramps showed slightly high values, and it was considered that a sufficient care was necessary for these patients. Among patients accompanied with high fever, no patient showed a high determined value of cytochrome C.

[0058] Further, changes in ...

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Abstract

A method for detecting cell death, which comprises determining cytochrome C in body fluid and detecting cell death based on a quantified value, as well as a method for determining cytochrome C in body fluid by a sandwich method and a reagent for measuring cytochrome C for determination cytochrome C in body fluid by a sandwich method, which comprises an antibody directed to cytochrome C as an ingredient.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and a reagent for detecting cell death. BACKGROUND ART [0002] Graft versus host disease (GVHD), which is a disease that is caused after bone marrow transplantation and damages many organs; hemophagocytic syndrome (HPS), which is a disease where blood cells are phagocytized by phagocytes, especially virus associated hemophagocytic syndrome (VAHS) occurring after viral infection; and so forth are severe diseases that cause organ failures and eventually lead to death. Currently, cytologic diagnosis such as biopsy is generally used for diagnosing these diseases. However, such diagnosis suffers from drawbacks in view of patient's pain during the test, time required for diagnosis and operation procedures. [0003] Since it has been found in recent years that a major cause of GVHD and HPS is cell apoptosis in living bodies, it is considered that GVHD and HPS may be diagnosed by detecting apoptosis. [0004] As methods for detecti...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01N33/53G01N33/537G01N33/543C07K16/40C12Q1/26G01N33/68
CPCC12Q1/26G01N33/50G01N33/68G01N2333/795G01N2510/00
Inventor ENDO, FUMIOADACHI, NAOTONUNOI, HIROYUKIWATANABE, KEISUKE
Owner EISIA R&D MANAGEMENT CO LTD