Abstract:
:The effect of urea on the oxygen affinity of sickle cells and normal cells was studied up to a concentration of about 1.0 M. Besides the increase in oxygen affinity found in both normal and sickle cells there was a further increase found only in the sickle cells. This specific increase was caused by the direct inhibition of the polymerization of deoxygenated Hb-S by the urea and was used to measure the extent of this inhibition. Even at concentrations of 1.0 M the urea did not fully inhibit the polymerization. At the urea concentrations recommended for treatment of sickle cell crises and for the oral treatment of the disease there was only a very slight inhibition of polymerization. The small increase in oxygen affinity brought about by these concentrations of urea (equivalent to a log P50 change of 0.016) will cause some additional minimal inhibition of sickling at physiological partial pressures of oxygen. Oxygen dissociation measurements of Hb-A in dilute solution showed that 0.95 M urea had no effect on the interaction of 2,3-DPG and chloride with haemoglobin nor on the haem-haem interactions. This implies that the quaternary 'deoxy' form of the haemoglobin may still form and that the action of urea in inhibiting the polymerization is through interference with the intermolecular bonds rather than by inducing a conformational change which disrupts the bonding. Unless urea at the concentrations recommended for treatment inhibits the sickling of the cells by some mechanism other than its effect on the haemoglobin (such as by an effect on the membrane), these results suggest that it is of little use for the treatment of sickle cell disease.
journal_name
Br J Haematoljournal_title
British journal of haematologyauthors
May A,Huehns ERdoi
10.1111/j.1365-2141.1975.tb00513.xsubject
Has Abstractpub_date
1975-05-01 00:00:00pages
21-9issue
1eissn
0007-1048issn
1365-2141journal_volume
30pub_type
杂志文章abstract::A simplified method of International Normalized Ratio (INR) derivation using linear regression of certified INR plotted against local prothrombin time (PT) results has been compared with INR from conventional orthogonal regression. Linear regression assumes error only with the local PT results whereas orthogonal regre...
journal_title:British journal of haematology
pub_type: 杂志文章,多中心研究
doi:10.1046/j.1365-2141.1997.d01-3498.x
更新日期:1997-09-01 00:00:00
abstract::The haematological and immunological characteristics of 34 healthy anti-HTLV-I antibody-positive individuals (HTLV-I carriers) in southwestern Japan were examined. No significant difference was noted between carriers and the controls in counts of RBC, WBC and the absolute number of lymphocytes. The serum IgG in the ca...
journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1111/j.1365-2141.1986.tb07587.x
更新日期:1986-09-01 00:00:00
abstract::This phase 2 study (N = 116) evaluated single-agent vosaroxin, a first-in-class anticancer quinolone derivative, in patients ≥60 years of age with previously untreated unfavourable prognosis acute myeloid leukaemia. Dose regimen optimization was explored in sequential cohorts (A: 72 mg/m(2) d 1, 8, 15; B: 72 mg/m(2) ...
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更新日期:2015-03-01 00:00:00
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journal_title:British journal of haematology
pub_type: 杂志文章
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更新日期:1997-11-01 00:00:00
abstract::Overexpression of manganese superoxide dismutase (MnSOD) has been postulated as one possible mechanism of protection from oxidative damage and free radicals. Doxorubicin treatment induces oxygen free radicals, leading to cytotoxicity and myelosuppression. The present study was performed to determine whether over-expre...
journal_title:British journal of haematology
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更新日期:2003-02-01 00:00:00
abstract::Thrombocytopenia and neutropenia are common among neonates in intensive care units. Bone marrow aspirations are sometimes performed as part of their evaluation. However, marrow biopsies have not been reported from living neonates. Since architecture and cellularity cannot generally be accurately assessed from marrow a...
journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1046/j.1365-2141.1999.01712.x
更新日期:1999-11-01 00:00:00
abstract::Bone marrow (BM) from patients affected by multiple myeloma (MM), exhibiting monoclonal gammopathy of undetermined significance (MGUS) or with non-Hodgkin lymphoma (NHL) as well as from healthy donors were investigated for the presence of human herpesvirus-8 (HHV-8) DNA sequences. ORF 26 sequences were detected in 36-...
journal_title:British journal of haematology
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doi:10.1046/j.1365-2141.2001.02702.x
更新日期:2001-04-01 00:00:00
abstract::MonoMAC is a complex primary immunodeficiency caused by mutations in the myeloid transcription factor GATA2, characterized by multilineage cytopenia with malignant complications and severe infections, including mycobacteria and herpesviruses. We describe the clinical presentation, genetics and antiviral inflammatory r...
journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1111/bjh.15947
更新日期:2019-08-01 00:00:00
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journal_title:British journal of haematology
pub_type: 杂志文章
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更新日期:1985-08-01 00:00:00
abstract::To identify a commonly deleted region of 13q14 in idiopathic myelofibrosis (IMF), we used fluorescence in situ hybridization analysis to test for deletion of the RB1 and BRCA2 genes, and the microsatellite loci D13S319 and D13S25, in a series of 25 patients. A further two patients with myelofibrosis secondary to polyc...
journal_title:British journal of haematology
pub_type: 杂志文章
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更新日期:2001-05-01 00:00:00
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journal_title:British journal of haematology
pub_type: 杂志文章
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更新日期:2012-09-01 00:00:00
abstract::Human monocytes contain a series of alpha-naphthyl acetate (alpha NA) esterases which are not present in other blood cells and which can be specifically inhibited by bis(4-nitrophenyl)-phosphate (BNPP). This inhibitor is non-toxic at the concentration used and thus enabled studies on the possible significance of this ...
journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1111/j.1365-2141.1985.tb02886.x
更新日期:1985-12-01 00:00:00
abstract::Mantle cell lymphoma (MCL) is a heterogenic non-Hodgkin lymphoma entity, with a median survival of about 5 years. In 2008 we reported the early - based on the median observation time of 4 years - results of the Nordic Lymphoma Group MCL2 study of frontline intensive induction immunochemotherapy and autologous stem cel...
journal_title:British journal of haematology
pub_type: 临床试验,杂志文章
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更新日期:2012-08-01 00:00:00
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更新日期:2020-06-01 00:00:00
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journal_title:British journal of haematology
pub_type: 杂志文章,评审
doi:10.1111/bjh.13247
更新日期:2015-04-01 00:00:00
abstract:SUMMARY:We report two patients with chronic myeloid leukaemia (CML) developing hypoplasia and karyotype conversion after conventional busulphan therapy. Initially, the percentage of Ph-positive metaphases in marrow for both patients was 100%, which steadily diminished up to a complete disappearance in case 1 and decrea...
journal_title:British journal of haematology
pub_type: 杂志文章
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更新日期:1996-03-01 00:00:00
abstract::β- thalassaemia is a disorder of globin gene synthesis resulting in reduced or absent production of the β-globin chain in red blood cells. In this study, haematopoietic stem cells were isolated from the peripheral blood of six transfusion dependent β-thalassaemia patients and six healthy controls. Following 7 and 14 d...
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journal_title:British journal of haematology
pub_type: 杂志文章
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更新日期:1976-07-01 00:00:00
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pub_type: 杂志文章,多中心研究
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更新日期:2008-10-01 00:00:00
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journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1111/j.1365-2141.1988.tb04226.x
更新日期:1988-04-01 00:00:00
abstract::Pentose phosphate shunt activity was studied by the release of 14CO2 from 14C-1-glucose and 14C-2-glucose in the red cells of five patients with pyruvate kinase deficiency and found to be significantly decreased after new methylene blue stimulation when compared to high reticulocyte controls. Incubated Heinz body form...
journal_title:British journal of haematology
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doi:10.1111/j.1365-2141.1983.tb02122.x
更新日期:1983-07-01 00:00:00
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journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1046/j.1365-2141.1996.d01-1814.x
更新日期:1996-08-01 00:00:00
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journal_title:British journal of haematology
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更新日期:1991-02-01 00:00:00
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journal_title:British journal of haematology
pub_type: 杂志文章
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更新日期:2013-02-01 00:00:00
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journal_title:British journal of haematology
pub_type: 杂志文章
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更新日期:2009-08-01 00:00:00
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journal_title:British journal of haematology
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doi:10.1046/j.1365-2141.2001.03099.x
更新日期:2001-10-01 00:00:00
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journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1111/j.1365-2141.1992.tb06951.x
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