Familial incidence of precipitating antibodies in von Willebrand's disease: A study of four cases

Z. M. Ruggeri, N. Ciavarella, P. M. Mannucci, A. Molinari, F. Dammacco, J. M. Lavergne, D. Meyer

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Precipitating antibodies directed toward human F.VIII/WF were found in the plasma of four out of 17 multitransfused patients with severe, homozygous-like VWD. The familial incidence was illustrated by the development of these antibodies in three patients from the same kindred. Such antibodies, titrated with newly developed quantitative assays of anti-VIIIR:Ag and anti-VIIIR:RCo, were directed toward only these components of F.VIII/WF. VIII:C was neutralized in a time-independent manner in plasma and was not inactivated when separated from F.VIII/WF by solid-phase PE absorption. Plasma, serum, or immunoglobulin reacted in the precipitation systems (immunodiffusion, EID, CIE) with human VIIIR:Ag, with some degree of cross-reactivity toward VIIIR:Ag from other mammalian plasmas. When used in IRMA, these antibodies demonstrated the same abnormalities as heterologous antiseria in variant VWD: decreased binding affinity or nonparallelism of the dose-response curves. They are polyclonal IgG with both kappa and lambda light chains. It is suggested that in some patients with severe homozygous-like VWD, the synthesis of the component of F.VIII/WF carrying VIIIR:Ag and VIIIR:RCo is suppressed whereas VIII:C production is not completely abolished.

Original languageEnglish
Pages (from-to)60-75
Number of pages16
JournalThe Journal of Laboratory and Clinical Medicine
Issue number1
Publication statusPublished - 1979

ASJC Scopus subject areas

  • Medicine(all)
  • Pathology and Forensic Medicine


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