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The human Ia system: Definition and characterization by xenogeneic antisera

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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 EIg 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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