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The Journal of Immunology, Vol 137, Issue 10 3259-3263, Copyright © 1986 by American Association of Immunologists
ARTICLES |
N Dana, B Styrt, JD Griffin, RF Todd 3d, MS Klempner and MA Arnaout
Granulocytes from patients genetically deficient in the leukocyte glycoprotein family, Mo1, LFA-1, and Leu-M5 (P150,94), have defective complement receptor type III (CR3) activity as well as abnormal adhesion-dependent functions such as spreading, chemotaxis, and phagocytosis. To determine the contribution of the Mo1 heterodimer deficiency to the various functional aberrations observed in deficient granulocytes, we mapped the functional domains of Mo1 using several monoclonal antibodies to this molecule. In addition to iC3b binding, two granulocyte adhesion functions were examined: Cell spreading on plastic coverslips and chemotaxis. One monoclonal antibody to Mo1, 44, inhibits all three functions. Other monoclonal antibodies (903, Leu-15, and OKM10) inhibit iC3b binding to granulocytes but have no effect on cell spreading and/or chemotaxis. Another antibody, 904, has no significant inhibition of iC3b binding but inhibits spreading on plastic and chemotaxis. These studies suggest the presence of two functional domains in Mo1: one involved in iC3b binding and the other in enhancing certain granulocyte adhesion-dependent functions.
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