Abstract
The production of xenogeneic anti-Ia serum against Ia antigens in serum has been previously described in the mouse and we now describe the production of xenogeneic anti-human Ia antisera using similar methods. With an indirect resetting technique, Ia-like antibodies were shown to react with the majority of B cells (95%), a subpopulation of T cells, with carbonyl iron adherent cells, and with some E−Ig− null cells, but there was no reaction with red cells and platelets. These reactions were the same as those obtained with DRW antisera using cytotoxicity testing. In addition, antigens detected with xenogeneic antisera were also found in serum, where they were found to exist in a low molecular weight, dialyzable form. By the selective removal of different cell surface markers by cocapping, no association could be found with the specifities detected with the xenogeneic anti-Ia antisera and with surface Ig,β 2-microglobulin, or HLA-A and B specificities. Alloantibodies to DRW specificities (but not HLA-A, B specificities) were able to specifically block the binding of the rabbit anti-Ia antibodies to B cells, and reciprocal blocking of rabbit antisera by DRW antibodies was also observed. Several xenogenic antisera were produced by immunizing rabbits with the serum of different individuals. Each antiserum was shown to contain a number of different specificities, as they gave different reaction patterns with different individuals when testing was done both directly and by absorption. These xenogeneic anti-la sera also segregated in a family with HLA-A and B specificities. The detection of a polymorphic antigenic system segregating with the HLA complex, distinct from HLA-A and B specificities, and whose antigens occur predominantly on B cells is therefore described. Because of the similarity of the reactions of the xenogeneic antisera in man to those found in the mouse, and because of the close relationship to the DRW specificities, the system has been provisionally called the ‘H.Ia’ system.
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Abbreviations
- AET:
-
2-aminoethyl isothiouronium bromide
- β 2-M:
-
β-2 microglobulin
- BSA:
-
Bovine serum albumin
- H.Ia:
-
Human Ia
- HuRBC:
-
Human red blood cells
- Ig:
-
Immunoglobulin
- Ir:
-
Immune response
- MHC:
-
Major histocompatibility complex
- MLR:
-
Mixed lymphocyte reaction
- NHS:
-
Normal human serum
- NMS:
-
Normal mouse serum
- PBL:
-
Peripheral blood lymphocytes
- PBS:
-
Phosphate-buffered saline
- RAHIg:
-
Rabbit anti-human immunoglobulin
- RASIg:
-
Rabbit anti-sheep immunoglobulin
- RFC:
-
Rosette-forming cells
- SAHIg:
-
Sheep anti-human immunoglobulin
- SARIy:
-
Sheep anti-rabbit immunoglobulin
- SRBC:
-
Sheep red blood cells
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Sandrin, M.S., Vaughan, H.A., McKenzie, I.F.C. et al. The human Ia system: Definition and characterization by xenogeneic antisera. Immunogenetics 8, 185–200 (1979). https://doi.org/10.1007/BF01561429
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DOI: https://doi.org/10.1007/BF01561429