METHOD FOR MEASURING BIOLOGICAL SAMPLE AND MEASURING APPARATUS THEREFOR

• US 20080131898A1
• Filed: 11/27/2007
• Published: 06/05/2008
• Est. Priority Date: 11/27/2006
• Status: Active Application

• Current Assignee: Sysmex Corporation
• Original Assignee: Sysmex Corporation
• Inventors: Oguni, Shinichiro, Yoshida, Ayumu, Tsuji, Tomohiro
• Application Number:
  US11/945,835
• Publication Number:
  US 20080131898A1
• Time in Patent Office: Days
• US Class Current: 435/6
• CPC Class Codes: G01N 15/147 the analysis being performed on a sample stream
• CPC Class Codes: G01N 2015/008 White cells
• CPC Class Codes: G01N 2015/016 White blood cells
• CPC Class Codes: G01N 2015/1486 Counting the particles
• CPC Class Codes: G01N 33/5094 for blood cell populations red blood cells G01N33/80

Abstract

The present invention relates to a method for measuring a biological sample and a measuring apparatus therefor and in particular to a method for measuring a biological sample in which hematopoietic progenitor cells can be counted highly accurately by distinguishing them from other hemocytes and a measuring apparatus therefor.

Claims

1. A method for measuring a biological sample, comprising steps of:

preparing a measurement sample by damaging cell membranes of erythrocytes and mature leukocytes in a biological sample, substantially not damaging cell membranes of hematopoietic progenitor cells in the biological sample, shrinking the damaged erythrocytes, and staining nucleic acid in the damaged mature leukocytes with a fluorescent dye;

irradiating cells in the measurement sample with light;

obtaining first scattered light information, second scattered light information and fluorescence information from the irradiated cells, the first scattered light information being different from the second scattered light information;

specifying hematopoietic progenitor cells based on the obtained first and second scattered light information and the obtained fluorescence information; and

counting the specified hematopoietic progenitor cells.

2. A method according to claim 1, wherein the specifying step is performed by:

determining a first cell group containing hematopoietic progenitor cells based on the first and the second scattered light information;

determining a second cell group containing hematopoietic progenitor cells based on the first scattered light information and the fluorescence information; and

specifying, as hematopoietic progenitor cells, cells which belong to both of the first and second cell groups.

3. A method according to claim 1, which further comprises steps of:

preparing a scattergram displaying the specified hematopoietic progenitor cells on the basis of the fluorescence information and the second scattered light information; and

displaying the scattergram.

4. A method according to claim 1, wherein the specifying step is performed by:

determining a first cell group containing hematopoietic progenitor cells based on the first and second scattered light information; and

specifying hematopoietic progenitor cells from among the first cell group, on the basis of the first scattered light information and fluorescence information of the first cell group.

5. A method according to claim 1, wherein the specifying step is performed by:

determining a first cell group containing hematopoietic progenitor cells based on the first scattered light information and fluorescence information;

specifying hematopoietic progenitor cells from among the first cell group, on the basis of the first and second scattered light information of the first cell group.

6. A method according to claim 2, which further comprises steps of:

preparing a first scattergram including a first cell group appearing region on the basis of the first and second scattered light information;

preparing a second scattergram including a second cell group appearing region on the basis of the first scattered light information and the florescence information; and

displaying the first and second scattergrams.

7. A method according to claim 1, wherein the specifying step is performed by

determining a first cell group containing hematopoietic progenitor cells, based on the first and second scattered light information;

determining, as a second cell group, a cell group other than a ghost group based on the first scattered light information and the fluorescence information;

determining a third cell group substantially free of at least mature leukocytes, from among the second cell group, based on the second scattered light information and the fluorescence information; and

specifying, as hematopoietic progenitor cells, cells which belong to both of the first and third cell groups.

8. A method of according to claim 1, wherein the specifying step is performed by:

determining a cell group other than a ghost group in the measurement sample, based on the fluorescence information and the first scattered light information; and

specifying hematopoietic progenitor cells from among the cell group other than a ghost group, based on the second scattered light information and the fluorescence information.

9. The method according to claim 8, which further comprises steps of:

preparing a scattergram displaying the specified hematopoietic progenitor cells on the basis of the fluorescence information and the first scattered light; and

displaying the scattergram.

10. A method according to claim 1, wherein the first scattered light information is forward scattered light intensity, the second scattered light information is side scattered light intensity, and the fluorescence information is fluorescence intensity.

11. A method according to claim 1, wherein the sample preparing step is performed by mixing a surfactant for damaging cell membranes of erythrocytes and mature leukocytes, a solubilizing agent for shrinking the damaged erythrocytes, a fluorescent dye for staining a nucleic acid, and a biological sample.

12. A method according to claim 1, wherein the sample preparing step is performed by mixing the biological sample and a reagent containing a surfactant for damaging cell membranes of the erythrocytes and mature leukocytes, and a solubilizing agent for shrinking the damaged erythrocytes thereby damaging cell membranes of the erythrocytes and mature leukocytes contained in the biological sample and shrinking the damaged erythrocytes.

13. A method according to claim 1, wherein the sample preparing step is performed by mixing the biological sample and a reagent containing a surfactant for damaging cell membranes of the erythrocytes and mature leukocytes, a solubilizing agent for shrinking the damaged erythrocytes, and a sugar thereby damaging cell membranes of the erythrocytes and mature leukocytes contained in the biological sample and shrinking the damaged erythrocytes.

14. A method according to claim 13, wherein the sugar is at least one member selected from the group consisting of xylitol, arabinose, glucose, mannitol, sorbitol and ribitol.

15. An apparatus for measuring a biological sample, comprising:

a means for preparing a measurement sample by damaging cell membranes of erythrocytes and mature leukocytes in a biological sample, substantially not damaging cell membranes of hematopoietic progenitor cells in the biological sample, shrinking the damaged erythrocytes, and staining nucleic acid in the damaged mature leukocytes with a fluorescent dye;

a means for irradiating cells in the measurement sample with light;

a means for obtaining first scattered light information, second scattered light information and fluorescence information from the irradiated cells, the first scattered light information being different from the second scattered light information;

a means for specifying hematopoietic progenitor cells based on the obtained first and second scattered light information and the obtained fluorescence information; and

a means for counting the specified hematopoietic progenitor cells.

16. An apparatus according to claim 15, which further comprising:

a means for preparing a scattergram displaying the specified hematopoietic progenitor cells on the basis of the fluorescence information and the second scattered light information; and

a means for displaying the scattergram.

17. An apparatus according to claim 15, which further comprises a means for displaying counting results of the hematopoietic progenitor cells.