Abstract:
:In studies on human platelets, nitroprusside (NP) alone at 1-10 micromol/l increased platelet cyclic AMP (cAMP) by 40-70%, whereas increases in cyclic GMP (cGMP) were much larger in percentage though not in concentration terms. Collagen enhanced these increases in cAMP up to fourfold, without affecting cGMP. This effect was partly prevented by indomethacin or aspirin, indicating that platelet cyclo-oxygenase products acted synergistically with NP to increase cAMP. ADP released from the platelets by collagen tended to restrict this cAMP accumulation. Addition of 2',5'-dideoxyadenosine (DDA), an inhibitor of adenylyl cyclase, decreased both the inhibition of collagen-induced platelet aggregation by NP and the associated accumulation of cAMP without affecting cGMP, indicating that cAMP mediates part of the inhibitory effect of NP. Unlike DDA, 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ), an inhibitor of guanylyl cyclase, blocked all increases in both cGMP and cAMP caused by NP, as well as the inhibition of platelet aggregation, suggesting that cAMP accumulation was secondary to that of cGMP. Human platelet cGMP-dependent protein kinase (PKG) coelectrophoresed with the purified bovine type Ibeta isoenzyme. An inhibitor of this enzyme (Rp)-beta-phenyl-1,N2-etheno-8-bromoguanosine 3',5'-cyclic-monophosphorothioate, diminished the inhibition of collagen-induced platelet aggregation by NP, but had little additional effect when DDA was present. This showed that both PKG and cAMP participate in the inhibition of collagen-induced platelet aggregation by NP. Moreover, selective activators of PKG and cAMP-dependent protein kinases had supra-additive inhibitory effects, suggesting that an optimal inhibitory effect of NP requires simultaneous activation of both enzymes.
journal_name
Br J Haematoljournal_title
British journal of haematologyauthors
Jang EK,Azzam JE,Dickinson NT,Davidson MM,Haslam RJdoi
10.1046/j.1365-2141.2002.03479.xsubject
Has Abstractpub_date
2002-06-01 00:00:00pages
664-75issue
3eissn
0007-1048issn
1365-2141pii
3479journal_volume
117pub_type
杂志文章abstract::We have assessed the effects of the diphosphonate, dichloromethylene diphosphonate (Cl2MDP), in 19 patients with hypercalcaemia and increased bone resorption due to myeloma. Cl2MDP (800-3200 mg daily by mouth or 300 mg daily by intravenous infusion) decreased plasma calcium and biochemical indices of increased bone re...
journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1111/j.1365-2141.1983.tb02074.x
更新日期:1983-05-01 00:00:00
abstract::Anaplastic large cell lymphomas (ALCLs) are rare CD30+ peripheral T-cell lymphomas (PTCLs) classified according to the expression of the anaplastic lymphoma kinase (ALK+) protein or not (ALK-). We have analysed the outcome and risk factors for survival in a population-based bi-national cohort of patients with systemic...
journal_title:British journal of haematology
pub_type: 杂志文章,多中心研究
doi:10.1111/bjh.14740
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abstract::Erythroid regeneration is an important and separate element in the engraftment process in allogeneic and autologous bone marrow transplantation (alloBMT, autoBMT). Qualitative visual reticulocyte counting has proved inadequate in the evaluation of erythropoiesis after BMT but automated flow cytometry now allows the re...
journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1111/j.1365-2141.1992.tb08163.x
更新日期:1992-05-01 00:00:00
abstract::Myelodysplastic syndrome (MDS) is a common neoplasm of haematopoietic pluripotent stem cells. Although one third of MDS patients evolve to acute myeloid leukaemia (AML), little is understood about the mechanisms responsible for this progression. We have previously detected the frequent loss of heterozygosity (LOH) on ...
journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1046/j.1365-2141.2003.04434.x
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abstract::The aim of this study was to evaluate the role of markers of bone remodelling, and osteoclast activation/function in patients with monoclonal gammopathy of undetermined significance (MGUS). We have measured serum levels of soluble RANKL (sRANKL), osteoprotegerin (OPG), macrophage inflammatory protein-1alpha (MIP-1alph...
journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1111/j.1365-2141.2004.05092.x
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abstract::Acute Human Parvovirus B19 (HPV B19) infection is the major cause of transient red cell aplasia (TRCA) and acute anaemia in patients with sickle cell disease (SCD). We report three cases of patients who developed nephrotic syndrome (NS) with chronic sequelae after initially presenting with HPV B19-associated TRCA. The...
journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1111/j.1365-2141.2009.08062.x
更新日期:2010-04-01 00:00:00
abstract::Sickle cell anaemia is a severe inherited blood disorder for which there is presently no curative therapy other than allogeneic haematopoietic stem cell (HSC) transplantation. This therapeutic option, however, is not available to most patients because of the lack of a matched related donor. Different genetic strategie...
journal_title:British journal of haematology
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更新日期:2011-09-01 00:00:00
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journal_title:British journal of haematology
pub_type: 杂志文章,多中心研究
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更新日期:2011-09-01 00:00:00
abstract::An unusual variant of congenital dyserythropoietic anaemia is described presenting as mild haemolytic anaemia with multinucleated erythroblasts in the marrow of the proband. The outcome of her non-consanguineous pregnancy was a third trimester, in utero, fetal demise. The hydropic fetus had dyserythropoiesis with circ...
journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1111/j.1365-2141.1993.tb03119.x
更新日期:1993-07-01 00:00:00
abstract::A double-blind, crossover, placebo-controlled study of the effect of vitamin E on platelet functions was performed on nine splenectomized and 16 non-splenectomized beta-thalassaemia/haemoglobin E (beta-thalassaemia/HbE) patients. The patients were supplemented with a daily dose of vitamin E (525 IU) for 3 months. The ...
journal_title:British journal of haematology
pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:2003-11-01 00:00:00
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journal_title:British journal of haematology
pub_type: 杂志文章,多中心研究,随机对照试验
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更新日期:2018-05-01 00:00:00
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journal_title:British journal of haematology
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doi:10.1111/j.1365-2141.2010.08492.x
更新日期:2011-02-01 00:00:00
abstract::Among 80 hereditary spherocytosis (HS) kindreds studied using denaturing electrophoretic separation of solubilized eythrocyte membrane proteins, we recognized three prominent subsets: HS with isolated spectrin deficiency, HS with combined spectrin and ankyrin deficiency, and HS with band 3 deficiency These three subse...
journal_title:British journal of haematology
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doi:10.1046/j.1365-2141.1997.1893005.x
更新日期:1997-07-01 00:00:00
abstract::The prevalence of obesity has increased substantially over recent years. Clinicians are increasingly being challenged with making uncertain anticoagulant dosing decisions, as the optimal dosing strategy for most anticoagulants in the obese patient population remains unknown. Research published to date suggests that th...
journal_title:British journal of haematology
pub_type: 杂志文章,评审
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更新日期:2011-10-01 00:00:00
abstract::We have investigated the control of lysozyme gene expression in HL-60 cells induced to differentiate into macrophage-like cells with phorbol myristate acetate (PMA). Differentiation, as evidenced by cellular adherence, and morphological changes corresponded temporally to an increase in nonspecific esterase activity. T...
journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1111/j.1365-2141.1985.tb07380.x
更新日期:1985-05-01 00:00:00
abstract::We describe and compare five assay systems for Protein C (PC) in human plasma; a functional assay for PC activity, Laurell electroimmunoassay with EDTA or calcium (EDTA-Laurell or Ca-Laurell), radioimmunoassay (RIA) and immunoradiometric assay (IRMA). The lower limit of sensitivity of PC in normal reference plasma was...
journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1111/j.1365-2141.1986.tb02915.x
更新日期:1986-01-01 00:00:00
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journal_title:British journal of haematology
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journal_title:British journal of haematology
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journal_title:British journal of haematology
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abstract::In order to clarify the indications for splenectomy in patients with homozygous beta thalassaemia we studied, retrospectively, the basal pre-transfusion haemoglobin levels and blood transfusion requirements before and after splenectomy, in a series of patients with this disorder. Thirty-six patients, of whom 20 underw...
journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1111/j.1365-2141.1975.tb00870.x
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journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1046/j.1365-2141.2001.03044.x
更新日期:2001-09-01 00:00:00
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journal_title:British journal of haematology
pub_type: 杂志文章
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pub_type: 杂志文章,多中心研究
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journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1111/j.1365-2141.1981.00039.x
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journal_title:British journal of haematology
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abstract::Dendritic cell (DC) differentiation was investigated in samples from two acute promyelocytic leukaemia (APL) patients with classic translocation t(15;17)(q22;q21). After 18 d of culture in the presence of granulocyte-macrophage colony-stimulating factor, interleukin 4 and tumour necrosis factor alpha, 10-15% of pathol...
journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1046/j.1365-2141.2001.03023.x
更新日期:2001-09-01 00:00:00
abstract::Cord blood (CB) has successfully been used as a stem cell source for haemopoietic reconstitution. However, a significant delay in platelet engraftment is consistently found in CB versus adult peripheral blood (PB) or bone marrow transplants. We sought to determine whether or not CB megakaryocytes have reached terminal...
journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1046/j.1365-2141.2001.02954.x
更新日期:2001-08-01 00:00:00
abstract::A simple technique to separate erythrocytes from bone marrow by sedimentation under gravity after addition of hydroxyethyl starch is described. This method of removing red blood cells from the donor marrow was evaluated in 23 consecutive allogeneic bone marrow transplants between ABH-incompatible individuals. Infusion...
journal_title:British journal of haematology
pub_type: 杂志文章
doi:
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