Abstract
The isolation and characterization of Ia antigens from both lymphoid and nonlymphoid cells was attempted by SDS-polyacrylamide gel electrophoresis of radiolabeled, NP-40 solubilized, and anti-Ia precipitated lysates. The profiles obtained indicate that membrane proteins with a molecular weight of approximately 30,000 can be isolated from peripheral B but not from peripheral T cells. Ia antigens cannot be immunoprecipitated from cortisone-resistant thymocytes, total thymocytes, allogeneically activated T cells, Con A stimulated T cells, and anti-Ig immunoadsorbent purified T cells. Ia antigens seem to comprise only 1%–2% of labeled splenic intracellular and membrane-associated proteins. They differ from H-2 antigens and immunoglobulin H and L chains with respect to size and serological reactivity. Ia antigens cannot be found to be secreted from lymph node cells or splenocytes into the extracellular incubation media. Tissue distribution studies indicate that Ia antigens are present on macrophages, fetal liver cells, epidermal cells, and bone marrow cells. They have not been found on such tumor cells as myelomas, teratomas, and lymphocytic leukemias.
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Abbreviations
- B cell:
-
Bone-marrow derived lymphocyte
- T cell:
-
Thymus-derived lymphocyte
- H-2 :
-
Histocompatibility-2
- Ir-genes:
-
Immune response genes
- I-region:
-
Immune response region
- Ia:
-
Immune response region associated antigen
- Thy-1.2:
-
Thymic antigen 1 (formerlyθ-C3H)
- C′:
-
Complement
- Ig:
-
Immunoglobulin
- K k :
-
K-region of theH-2 k haplotype
- D k :
-
D-region of theH-2 k haplotype
- PBS:
-
Phosphate buffered saline
- MEM:
-
Eagle's minimal essential medium
- H chain:
-
Immunoglobulin heavy chain
- L chain:
-
Immunoglobulin light chain
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Recipient of Senior Dernham Fellowship D-207 from the American Cancer Society, California Division.
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Delovitch, T.L., McDevitt, H.O. Isolation and characterization of murine Ia antigens. Immunogenetics 2, 39–52 (1975). https://doi.org/10.1007/BF01572273
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DOI: https://doi.org/10.1007/BF01572273