title: Hereditary protein S deficiency.
abstract: Protein S is a vitamin K-dependent plasma protein that serves as a cofactor of activated protein C(APC) in its inhibitory action on activated factor V and factor VIII and in its stimulation of fibrinolytic activity. In plasma, part of the protein S is complexed with the C4b-binding protein. Only the free protein S has APC cofactor activity. In our laboratory, 30 patients from 8 nonrelated families were detected that fulfilled the criteria of an isolated protein S deficiency. All patients were heterozygotes for the defect that is inherited as an autosomal-dominant disorder. Patients with a protein S deficiency were found to be at risk for the development of venous thrombotic disease at a relatively young age.
authors.forename: R M
authors.initials: RM
authors.lastname: Bertina
mesh_terms: D000925:Anticoagulants / Q000627:therapeutic use; D001778:Blood Coagulation Disorders / Q000150:complications / Q000175:diagnosis / Q000188:drug therapy / Q000235:genetics*; D006023:Glycoproteins / Q000032:analysis* / Q000235:genetics; D006801:Humans; D017293:Protein S
chemical_list: D000925:Anticoagulants; D006023:Glycoproteins; D017293:Protein S