title: Immunoradiometric assays for the Ca(II)-dependent and Ca(II)-independent conformation of human protein C.
abstract: From a rabbit antiserum against human protein C, two subpopulations of antibodies recognizing Ca(II)-dependent and NonCa(II)-dependent epitopes of human protein C respectively were affinity purified for use in solid-phase immunoradiometric assays. The two assays were specific for PC:Ca(II)Ag and PC:NonCa(II)Ag and highly sensitive with a lower limit of detection of 2 ng/ml. The concentration of PC:Ca(II)Ag and PC:NonCa(II)Ag and their ratio in healthy volunteers was 0.91 +/- 0.16 U/ml, 0.95 +/- 0.14 U/ml and 0.97 +/- 0.18. In a group of patients treated with oral anticoagulants the ratio PC:Ca(II)Ag/PC:-NonCa(II)Ag was significantly decreased (to about 0.6) as compared with normal controls suggesting the presence of sub- and noncarboxylated protein C molecules (PIVKA-PC) in plasma of patients on oral anticoagulants. Analysis of plasmas of patients with a hereditary (n = 8) or isolated (n = 4) type II protein C deficiency and a history of thrombo-embolic disease did not reveal patients with a PC:Ca(II)Ag level and a PC:Ca(II)Ag/PC:NonCa(II)Ag ratio below the lower limit of the normal range suggesting that the frequency of genetic protein C variants with defects in the Ca(II)-dependent conformation is low.
authors.affiliation: Department of Hematology, Leiden University Hospital, The Netherlands.
authors.forename: S R
authors.initials: SR
authors.lastname: Poort
authors.forename: P P
authors.initials: PP
authors.lastname: Deutz-Terlouw
authors.forename: A
authors.initials: A
authors.lastname: van Wijngaarden
authors.forename: R M
authors.initials: RM
authors.lastname: Bertina
mesh_terms: D000818:Animals; D000925:Anticoagulants / Q000627:therapeutic use; D000941:Antigens / Q000032:analysis; D002118:Calcium / Q000502:physiology*; D002918:Chymotrypsin; D004591:Electrophoresis, Polyacrylamide Gel; D006801:Humans; D007118:Immunoassay / Q000379:methods; D011486:Protein C / Q000032:analysis* / Q000276:immunology; D020151:Protein C Deficiency; D011487:Protein Conformation; D011817:Rabbits
chemical_list: D000925:Anticoagulants; D000941:Antigens; D011486:Protein C; D002918:Chymotrypsin; D002118:Calcium