Abstract
The brain environment exerts a powerful influence on macrophage phenotype, as exemplified by microglia, but the mechanisms mediating this control are nuclear. Since adhesion molecules are known to transmit signals across cell membranes, we investigated adhesion receptors involved in macrophage interaction with brain tissue. We have demonstrated previously that macrophages adhere specifically to CNS neurones in an in vitro assay. Here we show that this adhesion is inhibited by lectins, including Griffonia simplicofolia isolectin B4 (GSI), which has been used as a microglial marker for many years. Adhesion is unaffected by antibodies to several known adhesion molecules but is markedly inhibited by a new monoclonal antibody: HB1. HB1 recognizes microglia in the normal brain and activated microglia and recruited monocytes during CNS pathology. It labels a subset of resident macrophages and recruited monocytes in other tissues. Using this antibody, we isolated a protein of about 110 kDa from macrophage cell lysates. This protein is recognized by GSI, providing the first evidence of a functional role for the antigen labelled by this lectin. Further study of the HB1 antigen may provide important information about the influence of the brain environment on the phenotype of monocytic cells.
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Brown, H., Townsend, M., Fearn, S. et al. The monoclonal antibody HB1 recognizes an adhesion molecule for macrophages in the brain. J Neurocytol 27, 867–876 (1998). https://doi.org/10.1023/A:1006932505819
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DOI: https://doi.org/10.1023/A:1006932505819