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. 1984 Jan;73(1):153–159. doi: 10.1172/JCI111186

Deficiency of a surface membrane glycoprotein (Mo1) in man.

N Dana, R F Todd 3rd, J Pitt, T A Springer, M A Arnaout
PMCID: PMC424986  PMID: 6361068

Abstract

Deficiency of a granulocyte surface glycoprotein of 150,000-D had been associated with defective C3- and IgG-dependent phagocytosis in a patient with recurrent bacterial infections. By using monoclonal antibodies, we found that this patient's granulocytes, monocytes, and null cells were deficient in Mo1 (equivalent to OKM1 and Mac-1), a cell surface molecule consisting of two noncovalently linked glycoproteins of 155,000 and 94,000 D. The 155,000-D subunit is closely associated with the human complement receptor that recognizes C3bi and/or a further degradation product termed C3dg (C3bi receptor); the 94,000-D subunit has been shown to be shared, on normal cells, by two other surface membrane glycoproteins: lymphocyte function-associated antigen-1 (LFA-1) and P-150, 95. Both subunits of Mo1 were deficient on the patient's granulocytes as determined by immunoprecipitation with subunit-specific monoclonal antibodies as well as fluorescence analysis. Mol-deficient monocytes, like granulocytes, had defective C3-and IgG-dependent phagocytosis. Natural killing activity by the patient's peripheral blood leukocytes was normal. Mo1-deficient granulocytes and monocytes rosetted normally with sheep erythrocytes coated with C3bi. This rosetting was totally inhibited by a mixture of anti-Mo1 and anti-C3b (the major fragment of C3) receptor antibodies but not by either antibody alone. Since monoclonal antibodies to the 155,000-D subunit of Mo1 can inhibit C3bi receptor binding, immune phagocytosis, opsonized zymosan-induced degranulation, and superoxide generation by normal phagocytes (functions which are defective in Mo1-deficient cells), it appears likely that Mo1 deficiency may in part underlie the functional aberrations leading to recurrent bacterial infections in man.

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Selected References

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