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A direct method for the calculation of alloreactive CD4+ T cell precursor frequency.
H Noorchashm1, Y K Lieu, S Y Rostami
1Department of Surgery, University of Pennsylvania Medical Center, Philadelphia 19104, USA.
Transplantation
|May 26, 1999
Summary
Researchers developed a new method to directly measure alloreactive CD4+ T cells. This breakthrough allows for precise calculation of T cell frequency, crucial for understanding immune responses to foreign tissues.
Area of Science:
- Immunology
- Cell Biology
- Transplantation Science
Background:
- Determining the precursor frequency of alloreactive CD4+ T cells was previously limited.
- A specific method to count daughter cells per division in stimulated T cells was lacking.
Purpose of the Study:
- To develop a novel method for direct calculation of alloreactive CD4+ T cell frequency.
- To enable the study of changes in alloreactive T cell frequency related to alloantigen tolerance.
Main Methods:
- Fluorescently labeled responder lymphocytes were used.
- Adoptive transfer into allogeneic mice or in vitro incubation with splenocytes.
- Flow cytometry analysis after 65-70 hours of stimulation.
Main Results:
- Direct measurement of dividing CD4+ T cell precursor frequency was achieved in vivo and in vitro.
- Calculated the frequency of alloantigen-specific CD4+ T cells using daughter cell counts per division.
Conclusions:
- A novel method for direct calculation of alloreactive CD4+ T cell frequency is presented.
- This technique facilitates the determination of frequency changes underlying alloantigen tolerance.