Linked Life Data

10752992

Source:http://linkedlifedata.com/resource/pubmed/id/10752992

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3-4
pubmed:dateCreated
2000-8-3
pubmed:abstractText
The mechanism that leads to hemopoietic failure in patients with myelodysplastic syndrome (MDS) is not well understood. There is evidence, however, that regulatory molecules such as tumor necrosis factor (TNF)-alpha, Fas (CD95), and Fas-ligand, which negatively affect hemopoiesis by way of apoptosis are upregulated. Here we analyzed marrow samples from 80 patients with MDS in regard to TNF-alpha and Fas-ligand levels and a possible correlation with various disease parameters and risk factors. TNF-alpha levels were elevated in comparison to samples from normal marrow donors, however, no significant correlation with FAB subtype, cytogenetic risk group or score by the International Prognostic Scoring System (IPSS) was observed. However, there was an inverse correlation between the cytogenetic risk category (low, intermediate, high) and levels of soluble Fas-ligand. The major source of TNF-alpha were mononuclear (non-stromal) cells which appeared to produce TNF-alpha at maximum levels. Limiting dilution analysis of CD34+ precursor cells showed that individually assayed cells, removed from companion cells that presumably provided negative signals such as TNF-alpha or Fas-ligand, were able to generate progressively increasing numbers of colonies. Stromal layers derived from MDS marrow did not have an inhibitory effect. In fact, higher colony numbers were obtained from both normal and MDS marrow derived hemopoietic precursors propagated on irradiated stromal layers from MDS marrow than on stromal layers from normal marrow. These results show that substantial numbers of normal hemopoietic precursors persist in MDS marrow. However, differentiation into mature cells is inhibited by negative signals originating from accessory or abnormal hemopoietic precursors in the non-adherent marrow fraction.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
1042-8194
pubmed:author
pubmed:issnType
Print
pubmed:volume
37
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
405-14
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
2000
pubmed:articleTitle
Negative regulators of hemopoiesis and stroma function in patients with myelodysplastic syndrome.
pubmed:affiliation
Clinical Research Division, Fred Hutchinson Cancer Research Center, University of Washington School of Medicine, and Hematologics, Seattle 98109-1024, USA. jdeeg@fhcrc.org
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't