Feedback signals in myelodysplastic syndromes

• Verfasst von: Walenda, Thomas [VerfasserIn]
• Verfasst von: Stiehl, Thomas [VerfasserIn]
• Verfasst von: Ho, Anthony Dick [VerfasserIn]
• Verfasst von: Marciniak-Czochra, Anna [VerfasserIn]
• Titel: Feedback signals in myelodysplastic syndromes
• Titelzusatz: increased self-renewal of the malignant clone suppresses normal hematopoiesis
• Verf.angabe: Thomas Walenda, Thomas Stiehl, Hanna Braun, Julia Fröbel, Anthony D. Ho, Thomas Schroeder, Tamme W. Goecke, Björn Rath, Ulrich Germing, Anna Marciniak-Czochra, Wolfgang Wagner
• Fussnoten: Gesehen am 08.08.2017
• Titel Quelle: Enthalten in: Public Library of Science: PLoS Computational Biology
• Jahr Quelle: 2014
• Band/Heft Quelle: 10(2014,4) Artikel-Nummer e1003599, 9 Seiten
• ISSN Quelle: 1553-7358
• DOI: doi:10.1371/journal.pcbi.1003599
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1561840017

Abstract

Myelodysplastic syndromes are diseases which are characterized by ineffective blood formation. There is accumulating evidence that they are caused by an aberrant hematopoietic stem cell. However, it is yet unclear how this malignant clone suppresses normal hematopoiesis. To this end, we generated mathematical models under the assumption that feedback signals regulate self-renewal and proliferation of normal and diseased stem cells. The simulations demonstrate that the malignant cells must have particularly higher self-renewal rates than normal stem cells - rather than higher proliferation rates. On the other hand, down-regulation of self-renewal by the increasing number of malignant cells in the bone marrow niche can explain impairment of normal blood formation. In fact, we show that serum of patients with myelodysplastic syndrome, as compared to serum of healthy donors, stimulates proliferation and moderately impacts on maintenance of hematopoietic stem and progenitor cells in vitro. Thus, aberrant high self-renewal rates of the malignant clone seem to initiate disease development; suppression of normal blood formation is then caused by a rebound effect of feedback signals which down-regulate self-renewal of normal stem and progenitor cells as well.