Abstract:
:The specific sodium pump antagonist ouabain was used to study the effect of sodium pump inhibition on granulopoietic colony formation by normal human bone marrow cells cultured in soft agar for 7 d. Suppression of colony formation was dose-dependent and occurred at a low and reproducible concentration. The use of an extended range of concentrations (1 X 10(-19) M to 1 X 10(-4) M) revealed no additional effect. Inhibition occurred when colony formation was stimulated by either normal human white blood cells in a soft agar underlayer, or the inclusion of pre-formed colony-stimulating activity. Sensitivity to inhibition was similar under either set of conditions, the 50% inhibitory concentrations being 2.70 +/- 0.43 (SE) X 10(-8) M and 2.83 +/- 0.21 (SE) X 10(-8) M respectively. This is interpreted as showing an effect primarily on the colony-forming cells rather than on the cellular production of colony-stimulating activity. Inhibition of colony formation by ouabain was opposed by the addition of extra potassium to the culture medium, confirming that the inhibition was mediated via a perturbation of monovalent cation exchange. Inhibition by 2 X 10(-7) M ouabain appeared to be reversible by simple washing after exposure for up to 24 h, suggesting that the inhibitory effect of ouabain is not primarily cytotoxic.
journal_name
Br J Haematoljournal_title
British journal of haematologyauthors
Steed AJ,Boardman KM,Delamore IWdoi
10.1111/j.1365-2141.1982.tb02795.xsubject
Has Abstractpub_date
1982-07-01 00:00:00pages
395-403issue
3eissn
0007-1048issn
1365-2141journal_volume
51pub_type
杂志文章abstract::This trial explored the efficacy of re-induction chemotherapy including bortezomib in paediatric relapsed/refractory acute lymphoblastic leukaemia. Patients were randomized 1:1 to bortezomib (1.3 mg/m2 /dose) administered early or late to a dexamethasone and vincristine backbone. Both groups did not differ regarding p...
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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journal_title:British journal of haematology
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journal_title:British journal of haematology
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pub_type: 杂志文章,多中心研究
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