Detection of factor IX antibodies by radioimmunoassay: effect of calcium on antibody-factor IX interaction
نویسندگان
چکیده
منابع مشابه
Detection of factor IX antibodies by radioimmunoassay: effect of calcium on antibody-factor IX interaction.
A radioimmunoassay for alloantibodies (inhibitors) and heteroantibodies to human factor IX has been developed using radioiodinated human factor IX and formalin-fixed, heat-killed Staphylococcus aureus cells (Staph A). Staph A was used as a solid-phase adsorbent for immune complexes. The assay is specific, shows excellent correlation with factor IX coagulant neutralization assays in detecting al...
متن کاملFactor IX antigen by radioimmunoassay. Abnormal factor IX protein in patients on warfarin therapy and with hemophilia B.
Factor IX, isolated from normal human plasma, was homogenous by polyacrylamide gel electrophoresis in urea and sodium dodecyl sulfate. On the latter, it migrated as a single polypeptide chain with or without reducing agents and had an apparent mol wt of 62,000. After iodination by chloramine-T, a single peak of 125I was found on gels. Immunoelectrophoresis in agarose with rabbit antifactor IX s...
متن کاملCrystal structure of the calcium-stabilized human factor IX Gla domain bound to a conformation-specific anti-factor IX antibody.
The binding of Factor IX to membranes during blood coagulation is mediated by the N-terminal gamma-carboxyglutamic acid-rich (Gla) domain, a membrane-anchoring domain found on vitamin K-dependent blood coagulation and regulatory proteins. Conformation-specific anti-Factor IX antibodies are directed at the calcium-stabilized Gla domain and interfere with Factor IX-membrane interaction. One such ...
متن کاملThe factor IX phospholipid-binding site is required for calcium-dependent activation of factor IX by factor XIa.
To determine the functional role of the metal-dependent conformational changes in Factor IX, two populations of conformation-specific anti-Factor IX antibodies were prepared. Anti-Factor IX X Mg(II) antibodies bind to Factor IX in the presence of Mg(II) and other metal ions, but not in the absence of metal ions. Anti-Factor IX X Ca(II)-specific antibodies bind to Factor IX in the presence of Ca...
متن کاملImmunoaffinity purification of factor IX (Christmas factor) by using conformation-specific antibodies directed against the factor IX-metal complex.
Factor IX is a vitamin K-dependent blood clotting zymogen that is functionally defective or absent in patients with hemophilia B. A method of immunoaffinity chromatography has been developed for a one-step high yield purification of factor IX directly from plasma. The technique utilizes conformation-specific antibodies that bind solely to the metal-stabilized factor IX conformer, but not to the...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Blood
سال: 1980
ISSN: 0006-4971,1528-0020
DOI: 10.1182/blood.v56.4.608.608