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- Dybedal, Ingunn (författare)
Tumor necrosis factor (TNF)-mediated activation of the p55 TNF receptor negatively regulates maintenance of cycling reconstituting human hematopoietic stem cells
- Artikel/kapitelEngelska2001
Förlag, utgivningsår, omfång ...
- 2001
Nummerbeteckningar
- LIBRIS-ID:oai:lup.lub.lu.se:c3e8947b-bac6-4f28-ba35-913d11ddf620
- https://lup.lub.lu.se/record/1121574URI
- https://doi.org/10.1182/blood.V98.6.1782DOI
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- Språk:engelska
- Sammanfattning på:engelska
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- Hematopoietic stem cell (HSC) fate decisions between self-renewal and commitment toward differentiation are tightly regulated in vivo. Recent developments in HSC culture and improvements of human HSC assays have facilitated studies of these processes in vitro. Through such studies stimulatory cytokines critically involved in HSC maintenance in vivo have been demonstrated to also promote HSC self-renewing divisions in vitro. Evidence for negative regulators of HSC self-renewal is, however, lacking. Tumor necrosis factor (TNF), if overexpressed, has been implicated to mediate bone marrow suppression. However, whether and how TNF might affect the function of HSC with a combined myeloid and lymphoid reconstitution potential has not been investigated. In the present studies in vitro conditions recently demonstrated to promote HSC self-renewing divisions in vitro were used to study the effect of TNF on human HSCs capable of reconstituting myelopoiesis and lymphopoiesis in nonobese diabetic-severe combined immunodeficient (NOD-SCID) mice. Although all cord blood and adult bone marrow CD34(+)CD38(-) cells were capable of undergoing cell divisions in the presence of TNF, cycling HSCs exposed to TNF in vitro and in vivo were severely compromised in their ability to reconstitute NOD-SCID mice and long-term cultures. The negative effect of TNF was not dependent on the Fas pathway, and a similar effect could be observed using a mutant TNF exclusively targeting the p55 TNF receptor. TNF did not appear to enhance apoptosis or affect cell-cycle distribution of cultured progenitors, but rather promoted myeloid differentiation. Thus, TNF might regulate HSC fate by promoting their differentiation rather than self-renewal.
Ämnesord och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
- Bryder, DavidLund University,Lunds universitet,Immunologi,Forskargrupper vid Lunds universitet,Immunology,Lund University Research Groups(Swepub:lu)med-dbr (författare)
- Fossum, AnnaLund University,Lunds universitet,Stamcellscentrum (SCC),Avdelningen för stamcellsforskning,Institutionen för laboratoriemedicin,Medicinska fakulteten,Stem Cell Center,Division of stem cell research,Department of Laboratory Medicine,Faculty of Medicine(Swepub:lu)an4328fo (författare)
- Rusten, Leiv S. (författare)
- Jacobsen, Sten Eirik WLund University,Lunds universitet,Stamcellscentrum (SCC),Avdelningen för stamcellsforskning,Institutionen för laboratoriemedicin,Medicinska fakulteten,Stem Cell Center,Division of stem cell research,Department of Laboratory Medicine,Faculty of Medicine(Swepub:lu)stem-sja (författare)
- ImmunologiForskargrupper vid Lunds universitet (creator_code:org_t)
Sammanhörande titlar
- Ingår i:Blood98:6, s. 1782-17911528-0020
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- Dybedal, Ingunn
- Bryder, David
- Fossum, Anna
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