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COMBINED IgG2, IgG4 AND IgA DEFICIENCY: LOW C1Q CONCENTRATIONS AND THE PRESENCE OF EXCESS C1R AND C1S IN AN ADULT PATIENT WITH RECURRENT PNEUMOCOCCAL INFECTIONS
K. PRELLNER,
J.H. BRACONIER,
A.G. SJøHOLM,
Corresponding Author
K. PRELLNER
Departments of Oto-Rhino-Laryngology, Infectious Diseases and Medical Microbiology, University Hospital of Lund, Sweden.
Department of Oto-Rhino-Laryngology, University Hospital, S-221 85 Lund, SwedenSearch for more papers by this authorJ.H. BRACONIER
Departments of Oto-Rhino-Laryngology, Infectious Diseases and Medical Microbiology, University Hospital of Lund, Sweden.
Search for more papers by this authorA.G. SJøHOLM
Departments of Oto-Rhino-Laryngology, Infectious Diseases and Medical Microbiology, University Hospital of Lund, Sweden.
Search for more papers by this authorK. PRELLNER,
J.H. BRACONIER,
A.G. SJøHOLM,
Corresponding Author
K. PRELLNER
Departments of Oto-Rhino-Laryngology, Infectious Diseases and Medical Microbiology, University Hospital of Lund, Sweden.
Department of Oto-Rhino-Laryngology, University Hospital, S-221 85 Lund, SwedenSearch for more papers by this authorJ.H. BRACONIER
Departments of Oto-Rhino-Laryngology, Infectious Diseases and Medical Microbiology, University Hospital of Lund, Sweden.
Search for more papers by this authorA.G. SJøHOLM
Departments of Oto-Rhino-Laryngology, Infectious Diseases and Medical Microbiology, University Hospital of Lund, Sweden.
Search for more papers by this authorFirst published: November 1985
Abstract
The complement (C) profile was investigated in an adult patient with combined IgG2, IgG4 and IgA deficiency and recurrent pneumococcal infections. The analysis revealed no gross impairment of the classic and alternative pathways of C activiation. However, the concentrations of circulating C1q were persistently decreased, and the sera contained an excess of C1r-C1s complexes, resembling the C1 aberrations previously found in children with recurrent acute otitis media. The concentrations of C4 in the patient were persistently low. This could be ascribed to partial C4 deficiency with lack of C4A variants. The patient's IgG and IgM antibody responses to pneumococcal capsular polysaccharides and to other bacterial carbohydrate antigens were very poor. Interestingly, pneumococcal C-polysaccharide (CPS) could be detected in serum obtained during infection-free periods. Since CPS has been shown to bind C1q without causing C1 activation, the possibility was considered that the C1 aberrations in serum were due to circulating CPS. After administration of intramuscular gammaglobulin to the patient, the serum C1q levels were observed to return to normal.
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