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Thromb Haemost 1988; 60(03): 442-446
DOI: 10.1055/s-0038-1646987
Original Article
Schattauer GmbH Stuttgart

Factor VIII Procoagulant Protein Interacts with Phospholipid Vesicles Via its 80 kDa Light Chain

G Kemball-Cook
The National Institute for Biological Standards and Control, Potters Bar, Herts., UK, Stockholm, Sweden
,
S J Edwards
The National Institute for Biological Standards and Control, Potters Bar, Herts., UK, Stockholm, Sweden
,
K Sewerin
*   KabiVitrum AG, Stockholm, Sweden
,
L O Anderson
*   KabiVitrum AG, Stockholm, Sweden
,
T W Barrowcliffe
The National Institute for Biological Standards and Control, Potters Bar, Herts., UK, Stockholm, Sweden
› Institutsangaben
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Publikationsverlauf

Received 30. Oktober 1987

Accepted after revision 26. Juli 1988

Publikationsdatum:
30. Juni 2018 (online)

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Summary

In a previous report, we detailed the fractionation of polyclonal human anti-Factor VIII :C into a component directed exclusively against the phospholipid-binding site on Factor VIII (PL-site antibody) and another directed at other sites (non-PL-site antibody). The location on the F.VIII molecule of its PL-binding site has now been studied by two different methods using this fractionated 125I-labelled anti-F.VIII: C Fab’.

The first method was modified from that of Weinstein et al. (Proc Natl Acad Sci USA 1981; 78: 5137-41), involving electrophoresis of F.VIII peptide-125I-Fab‘ A/F.VIII immunocomplexes in SDS-polyacrylamide gels. PL-site antibody reacted with F.VIII peptides of apparent Mr approximately 80 kDa and sometimes 160 kDa in plasma and concentrate, but not with larger peptides. Non-PL-site antibody, however, reacted with a range of peptides of apparent Mr 90 kDa to 280 kDa. In addition, when purified F.VIII containing heavy and light chains (HC + LC), and isolated LC peptides were analysed, PL-site antibody bound to LC peptides whereas non-PL-site antibody did not.

The second method used the antibody pools in immunoradiometric assays (IRMA’s) of purified F.VIII peptides. Both labels measured similar amounts of F.VIII: Ag in a sample of purified F.VIII containing both HC and LC; on assaying an HC preparation, however, PL-site label measured only 2% of F.VIII: Ag found by non-PL-site label, indicating that PL-binding sites are absent in HC preparations.

These results indicate that F.VIII binds to PL via its 80 kDa light chain.

Key words

Factor VIII - Phospholipid - Antibodies - Immunocomplexes
 

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