Abstract
The major histocompatibility or H–2 complex of the mouse is divided into five regions (K, I, S, G and D)1. Genes in the I region regulate immune responses2. The I region has several subregions which are designated I–A, I–B, I–J, I–E and I–C. The I–A and I–E subregions also code for a set of serologically detected cell-surface alloantigens, designated Ia antigens3. The relationship between the genes regulating the immune response and those encoding the serologically detectable alloantigens is still unknown. A number of species including man, rats and guinea pigs contain genetic regions apparently equivalent to the murine I region. Ia molecules are integral cell-surface glycoproteins that consist of two subunits of approximate molecular weights 35,000 (α) and 28,000 (β). Unlike the classical transplantation antigens which are present on almost all cells, the Ia antigens are found primarily on cells of the immune system—lymphocytes and macrophages4–6. A notable exception has been the demonstration of Ia antigens in mice, or Ia-like antigens in other mammals, on epidermal cells6–13. There is controversy about the numbers of Ia-positive cells in the epidermis. Fluorescence studies in humans11,12, guinea pigs14 and mice15 indicate that only about 5% of epidermal cells are Ia positive. These cells were identified by morphological criteria as the macrophage-like Langerhans cells. However, cytotoxicity studies in mice using anti-Ia sera indicate that a majority of epidermal cells (up to 90%) are Ia positive6–8. The reason for this discrepancy is not known. Here we demonstrate that the epidermal Ia molecules are synthesised by bone marrow-derived cells, presumably Langerhans cells.
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Frelinger, J., Hood, L., Hill, S. et al. Mouse epidermal Ia molecules have a bone marrow origin. Nature 282, 321–323 (1979). https://doi.org/10.1038/282321a0
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DOI: https://doi.org/10.1038/282321a0
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