polycythemia vera/phosphatase

Using the cytochemical method after Barka and Anderson, activity and localization of lysosomal acid phosphatase (AP) was determined in peripheral-blood lymphocytes from 20 healthy subjects, 10 patients with Hodgkin's disease (HD), 10 patients with plasma cell myeloma (PCM), and 10 patients with

The SHP-1 phosphatase associates with the receptors for erythropoietin, stem cell factor, and interleukin-3, and negatively regulates the mitogenic signals generated during engagement by their respective ligands. The erythroid progenitors of patients with polycythemia vera are hypersensitive to the

To determine whether decreased alkaline phosphatase activity in the granules from neutrophils of patients with chronic myelogenous leukemia (CML) was due to an absence of enzyme or the production of defective enzyme, we compared the immunologic properties of granule alkaline phosphatase derived from

To characterize the biological changes which result in increased granulocyte alkaline p-nitrophenyl phosphatase activity in patients with polycythemia vera, the enzyme was purified from granule fractions of sucrose homogenates made from dextran-sedimented leukocytes of normal subjects and patients

Erythropoietin (EP) and stem cell factor (SCF) are essential growth factors for erythroid progenitor cell proliferation and differentiation in serum-free culture. It has been previously shown that burst-forming units-erythroid and colony-forming units-erythroid from patients with polycythemia vera

Polycythemia vera (PV) is a clonal hematologic disease characterized by hyperplasia of the three major bone marrow lineages. PV erythroid progenitor cells display hypersensitivity to several growth factors, which might be caused by an abnormality of tyrosine phosphorylation. In the present study, we

Protein tyrosine kinases (PTKs) and phosphatases (PTPs) play a crucial role in normal cell development, and dysfunction of these enzymes has been implicated in human cancers. Polycythemia vera (PV) is a clonal hematologic disease characterized by hypersensitivity of hematopoietic progenitor cells to

Polycythemia vera (PV) is an acquired clonal disorder characterized by increased production of mature red cells and growth of erythroid colonies in the absence of erythropoietin. Mutation of the erythropoietin receptor has been demonstrated to cause familial polycythemia, but no mutations have been