Cutting edge: activation of the p38 mitogen-activated protein kinase signaling pathway mediates cytokine-induced hemopoietic suppression in aplastic anemia |
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Authors: | Verma Amit Deb Dilip K Sassano Antonella Kambhampati Suman Wickrema Amittha Uddin Shahab Mohindru Mani Van Besien Koen Platanias Leonidas C |
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Institution: | Section of Hematology-Oncology, Department of Medicine, University of Illinois and West Side Veterans Administration Medical Center, Chicago, IL 60607, USA. |
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Abstract: | Myelosuppressive cytokines, in particular IFN-gamma and TNF-alpha, play an important role in the pathogenesis of idiopathic aplastic anemia in humans. It is unknown whether these negative regulators of hemopoiesis suppress stem cells by activating a common signaling cascade or via distinct nonoverlapping pathways. In this study, we provide evidence that a common element in signaling for IFN-gamma and TNF-alpha in human hemopoietic progenitors is the p38/MapKapK-2 signaling cascade. Our studies indicate that pharmacological inhibition of p38 reverses the suppressive effects of IFN-gamma and TNF-alpha on normal human bone marrow-derived erythroid and myeloid progenitors. Most importantly, inhibition of p38 strongly enhances hemopoietic progenitor colony formation from aplastic anemia bone marrows in vitro. Thus, p38 appears to play a critical role in the pathogenesis of aplastic anemia, suggesting that selective pharmacological inhibitors of this kinase may prove useful in the treatment of aplastic anemia and other cytokine-mediated bone marrow failure syndromes. |
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