Related Experiment Videos
Mixed lymphocyte response-generated suppressor cell specificity in humans is major histocompatibility
M H Sayegh1, L A Turka, E L Milford
1Department of Medicine, Harvard Center for the Study of Kidney Diseases, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
Human Immunology
|December 1, 1989
Summary
Human suppressor cells generated in vitro show major histocompatibility complex restriction. This study confirms that suppressor cell function is primarily dictated by shared HLA haplotypes within families.
Area of Science:
- Immunology
- Genetics
Background:
- The human mixed lymphocyte response (MLR) is a key model for studying T-cell allorecognition.
- Suppressor cells generated during MLR play a crucial role in regulating immune responses, but their specificity remains debated.
Purpose of the Study:
- To investigate whether the allospecificity of MLR-generated suppressor cells is exclusively restricted to the major histocompatibility complex (MHC).
- To determine the role of human leukocyte antigen (HLA) sharing in mediating suppression by effector cells.
Main Methods:
- Generated suppressor effector cells from 18 primary MLRs using peripheral blood lymphocytes from 10 HLA-typed families.
- Tested effector cell suppression of 55 test MLRs involving naive autologous lymphocytes and irradiated stimulator cells from family members.
- Assessed suppression based on shared HLA haplotypes between priming stimulator cells and test culture stimulators.
Main Results:
- A statistically significant correlation was observed between suppression and shared HLA haplotype (p = 0.0143).
- However, unexpected suppression occurred in 6 of 13 assays, linked to shared HLA-A2 antigen, not full haplotype sharing.
- No HLA antigen sharing was observed in the remaining non-suppressed cultures.
Conclusions:
- In vitro generated suppressor cells within families exhibit effector function restricted by the MHC.
- While HLA haplotype sharing is a primary driver, specific HLA antigens like HLA-A2 may also influence suppressor cell activity.