Analyte detection

Patent metadata

Field	Value
Publication number	US-10274498-B1
Application number	US-201815946434-A
Country	US
Kind code	B1
Filing date	Apr 5, 2018
Priority date	Apr 5, 2018
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

This disclosure relates generally to detection and, in particular, to detecting objects within a sample or fraction thereof.

First claim

What is claimed is:

1. A method of detecting a plurality of biomarkers in a sample or fraction thereof, comprising:
providing said sample or fraction thereof;
performing a first antigen retrieval on the sample or fraction thereof at 50-90° C. to unmask a desired epitope or biomarker;
labeling at least one first biomarker of the sample or fraction thereof;
performing a second antigen retrieval on the sample or fraction thereof at a temperature greater than the temperature at which the first antigen retrieval is performed, wherein the second antigen retrieval is between 50-110° C.;
labeling at least one second biomarker of the sample or fraction thereof; and
detecting an object expressing the at least one first biomarker.

2. The method of claim 1 , wherein the first antigen retrieval is performed at 50-85° C.

3. The method of claim 1 , wherein the at least one first biomarker is CD11b, CD15, CD45, CD66b, CD105, or CD144.

4. The method of claim 1 , wherein the first labeling step is performed on a plurality of biomarkers of the sample or fraction thereof.

5. The method of claim 4 , wherein the plurality of biomarkers comprises a white blood cell marker, a granulocyte marker, and an endothelial cell marker.

6. The method of claim 5 , wherein the granulocyte marker is CD11b, CD66b, or CD15.

7. The method of claim 6 , wherein the endothelial cell marker is CD105 or CD144.

8. The method of claim 6 , wherein the endothelial cell marker is CD31.

9. The method of claim 4 , wherein the detection moieties of the first plurality of stains are in the same channel or have the same emission wavelength.

10. The method of claim 1 , wherein the first antigen retrieval is performed at 50-80° C.

11. The method of claim 10 , wherein the second antigen retrieval is performed at 80-110° C.

12. The method of claim 10 , wherein the second antigen retrieval is performed at 90-100° C.

13. The method of claim 1 , wherein the first labeling step further comprises an amplifying step.

14. The method of claim 1 , wherein the first labeling step causes a covalent bond to be formed between the sample or fraction thereof and a detection moiety.

15. The method of claim 1 ,
wherein the labeling of the at least one second biomarker is performed after the second antigen retrieval.

16. The method of claim 15 , the detecting step further comprising detecting the at least one second biomarker.

17. The method of claim 1 , further comprising:
labeling a second plurality of biomarkers of the sample or fraction thereof,
wherein labeling the second plurality is performed after the second antigen retrieval.

18. The method of claim 17 , wherein labeling the second plurality of biomarkers comprises adding, to the sample or fraction thereof:
at least one first affinity molecule-first hapten conjugate; and
at least one second affinity molecule-second hapten conjugate.

19. The method of claim 18 , wherein the first and second haptens are different.

20. The method of claim 18 , wherein the first and second haptens are the same.

21. The method of claim 20 , further comprising adding at least one anti-hapten-detection moiety conjugate, wherein the anti-hapten of the at least one anti-hapten-detection moiety conjugate binds to or interacts with the first or second hapten of the respective conjugates.

22. The method of claim 18 , further comprising at least one third affinity molecule-third hapten conjugate.

23. The method of claim 22 , further comprising:
at least one first anti-hapten-first detection moiety conjugate; and
at least one first complementary molecule-second detection moiety conjugate or second anti-hapten-second detection moiety conjugate;
wherein the at least one first anti-hapten of the at least one first anti-hapten-first detection moiety conjugate binds to or interacts with the first or second hapten or the respective conjugates, and
wherein the at least one first complementary molecule or the at least one second anti-hapten of the respective conjugates binds to or interacts with the third hapten.

24. The method of claim 23 , further comprising labeling the sample or fraction thereof with a nuclear stain.

25. The method of claim 24 , wherein the first detection moiety is a fluorophore or quantum dot, and wherein the second detection moiety is a fluorophore or quantum dot.

26. The method of claim 23 , wherein the third hapten is biotin and the first complementary molecule is an avidin.

27. The method of claim 1 , wherein the at least one second biomarker is labeled with a stain having a binding pair comprising first and second oligonucleotides which are complementary and which hybridize with each other.

28. The method of claim 27 , further comprising:
labeling at least a third biomarker with a stain having a binding pair comprising a hapten and anti-hapten which are complementary and which bind to or interact with each other.

29. The method of claim 1 , further comprising performing peroxidase denaturing before or after the second antigen retrieval.

30. The method of claim 1 , wherein the first labeling step is performed after the first antigen retrieval and before the second antigen retrieval.

Assignees

• Rarecyte Inc

Inventors

• Campton Daniel E
• Ramirez Arturo B
• Duplessis Melinda R

Classifications

• G01N33/5759 Primary

  involving compounds localised on the membrane of tumour or cancer cells · CPC title

• G01N33/57492 Primary

  Physics · mapped topic

• G01N2333/70503

  Immunoglobulin superfamily, e.g. VCAMs, PECAM, LFA-3 · CPC title

• G01N33/5064 Primary

  Endothelial cells · CPC title

• G01N33/80

  involving blood groups or blood types {or red blood cells (white blood cells G01N33/56972)} · CPC title