title: Megakaryocytopoiesis in different forms of thrombocytosis and thrombocytopenia: identification of megakaryocyte precursors by immunostaining of intracytoplasmic factor-VIII-related antigen.
abstract: Megakaryocytopoiesis was investigated with a polyclonal (26 cases) and a monoclonal (20 cases) antibody to factor-VIII-related antigen (factor VIII RAg) with the indirect peroxidase-antiperoxidase (PAP) method on air-dried bone marrow aspirates (BM). Numerous megakaryocyte precursors were identified in 5 patients with essential thrombocythemia (ET) and the 2 patients with acute myelogeneous leukaemia (AML) after recovery from therapeutic aplasia. Small megakaryocyte precursors were rare in controls (C), patients with reactive thrombocytosis (RT) and immune thrombocytopenia (IT). In 2 patients with severe alcoholism the number of mature megakaryocytes increased after 5 and 7 days of abstinence, respectively.
mesh_terms: D000911:Antibodies, Monoclonal; D000936:Antigen-Antibody Complex; D000941:Antigens / Q000032:analysis*; D001853:Bone Marrow / Q000473:pathology*; D003593:Cytoplasm / Q000032:analysis; D005169:Factor VIII / Q000032:analysis / Q000276:immunology*; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D006801:Humans; D008533:Megakaryocytes / Q000166:cytology*; D013921:Thrombocytopenia / Q000473:pathology*; D013922:Thrombocytosis / Q000473:pathology*; D014841:von Willebrand Factor / Q000032:analysis*
chemical_list: D000911:Antibodies, Monoclonal; D000936:Antigen-Antibody Complex; D000941:Antigens; D014841:von Willebrand Factor; D005169:Factor VIII