Fifteen nasal biopsy specimens from adult patients with selective IgA deficiency were examined in a ‘blind’ immunohistochemical study for the presence of immunocytes producing various immunoglobulin (Ig) classes. Three groups of patients could be identified. One group had a predominance of IgG- and IgM-producing cells in their nasal mucosa, a second group revealed mainly IgG- and IgD-producing cells, and a third group had very few mucosal immunocytes. The clinical examinations showed that upper respiratory tract infections were most common in patients with few immunocytes while such infections were least common in patients with predominance of IgG and IgM immunocytes. Our results indicated that IgM, in contrast to IgD, acts as a compensatory secretory Ig in some patients with selective IgA deficiency.

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© 1987 S. Karger AG, Basel
1987
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