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  • 1
    ISSN: 1432-1076
    Schlagwort(e): C2 deficiency ; Alternative pathway of complement ; Bacterial infections
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Selective homozygous deficiency of the second component of complement, C2, with increased susceptibility to infection was detected in five children of two unrelated families. Because the haemolytic activity of the alternative complement pathway (AP) was in the low normal range, we evaluated the AP activation pattern. Serum levels of factor B measured immunochemically and the haemolytic function of factor B were low normal. Levels of C3d were not increased. Activation products of factor B were undetectable indicating the absence of in vivo activation of AP. Activation of C3 in vitro by activators of the AP (zymosan A and lipopolysaccaride) was profoundly deficient in homozygous C2 deficiency while heterozygous carriers exhibited intermediate values. There was no correlation between serum levels of factor B and in vitro C3 activation. We conclude that defective AP activation may contribute to increased susceptibility to bacterial infections in some patients with homozygous C2 deficiency.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1432-1076
    Schlagwort(e): Combined immunodeficiency ; T-cell defect B-cell defect ; Cerebellar hypoplasia Pancytopenia
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract A male infant with primary combined immunodeficiency, microcephaly with marked cerebellar hypoplasia, and growth failure of prenatal onset is presented. He developed progressive pancytopenia in the 3rd year of life and died at 42 months from disseminated aspergillosis. Laboratory studies and post mortem examination failed to reveal any known aetiology for his disorder. Hreidarsson et al. [3] previously described a syndrome of progressive pancytopenia with microcephaly, cerebellar hypoplasia and growth failure in three boys, with similar clinical and laboratory findings. Although extensive immunological investigations were not performed in those previous patients, recurrent infections in two of them are suggestive of immunodeficiency. In the light of the immunological findings in our patient, we propose that the condition of the four patients belongs to the same syndrome, which has to be considered as a primary combined immunodeficiency syndrome. This syndrome can be distinguished from the other known immunodeficiency syndromes by its associated characteristic features, namely microcephaly with cerebellar hypoplasia, growth failure of prenatal onset and progressive pancytopenia.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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