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Flow Cytometry01:23

Flow Cytometry

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The development of flow cytometry techniques began in 1934 with initial attempts by Andrew Moldavan, a bacteriologist who counted the cells in a flowing capillary system. Moldavan pumped cells through a capillary tube focused under a microscope for visualization. The invention of photometry allowed the measurement of differentially-stained cells, and Louis Kamentsky developed the first multiparameter flow cytometer in 1965 to identify and count the cancer cells in cervical tissue specimens.
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Cell-based Flow Cytometry Assay to Measure Cytotoxic Activity
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Flow cytometry-based cytotoxicity and antibody binding assay.

Mats Alheim1

  • 1Department of Laboratory Medicine, Division of Clinical Immunology and Transfusion Medicine, Karolinska University Hospital, Stockholm, Sweden.

Current Protocols in Cytometry
|February 11, 2014
PubMed
Summary

This study introduces a novel flow cytometry method to detect harmful complement-fixing human leukocyte antigen (HLA) antibodies, improving early detection of kidney transplant rejection. The new assay simultaneously measures antibody binding and cell damage, offering a more efficient alternative to traditional methods.

Keywords:
HLA antibodiescomplement dependent cytotoxicitycrossmatchingflow cytometrykidney transplantation

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Area of Science:

  • Immunology
  • Transplantation immunology
  • Clinical chemistry

Background:

  • Complement-fixing human leukocyte antigen (HLA) antibodies increase early antibody-mediated rejection risk in kidney transplantation (KTx).
  • Current detection relies on the outdated, manually scored complement-dependent cytotoxicity (CDC) assay.
  • CDC is often combined with flow cytometry-based lymphocyte crossmatch assay (FCXM) for antibody binding detection.

Purpose of the Study:

  • To develop and describe a novel flow cytometry-based approach for simultaneously assessing HLA antibody-mediated cytotoxicity and binding.
  • To provide a more efficient and objective method for detecting potentially harmful complement-fixing HLA antibodies in kidney transplant recipients.

Main Methods:

  • Development of a new flow cytometry assay to simultaneously detect cytotoxicity and HLA antibody binding.
  • Utilized two strategies: magnetic bead-enriched T and B lymphocytes or bulk peripheral blood mononuclear cells (PBMC) as donor target cells.

Main Results:

  • The new flow cytometry approach enables simultaneous assessment of both cytotoxicity and antibody binding.
  • This method offers a potential improvement over traditional, manually intensive assays like CDC.

Conclusions:

  • A novel flow cytometry method for detecting complement-fixing HLA antibodies has been developed.
  • This approach allows for simultaneous assessment of cytotoxicity and antibody binding, offering a more efficient diagnostic tool for kidney transplantation.
  • This advancement may lead to improved early detection of antibody-mediated rejection.