2010
DOI: 10.1016/j.exphem.2009.11.006
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Loss of SIMPL compromises TNF-α-dependent survival of hematopoietic progenitors

Abstract: Objective-Emerging work has revealed an integral role of the TNFα-NF-κB pathway in the regulation of hematopoiesis. TNFα inhibition of hematopoietic stem/progenitor cell growth involves the type I TNFα receptor (TNF RI) and the type II TNFα receptor (TNF RII). However the role of TNF RI versus TNF RII in mediating this response is less clear. Full induction of NF-κB dependent gene expression through TNF RI requires the transcriptional co-activator SIMPL. To address the role of SIMPL in TNFα dependent signaling… Show more

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Cited by 4 publications
(4 citation statements)
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“…This difference may result from the difference of cells to be used in the experiment. The loss of substrate that interacts with interleukin-1 receptor-associated kinase binding protein 1 (IRAKIBPI, also known as mouse pelle-like kinase (SIMPL) specifically inhibits the TNF-a-dependentTNFRl-dependent response in mouse embryo fibroblasts [31,36] and in mouse hematopoietic progenitors [37]. In this study, we showed thatthe downregulation of IRAKIBPI by siRNA transfection blocked NF-KB activation, proliferation and ERKl g/ activation which were induced by the addition of TNF-a in hBMSCs.…”
Section: Discussionmentioning
confidence: 99%
“…This difference may result from the difference of cells to be used in the experiment. The loss of substrate that interacts with interleukin-1 receptor-associated kinase binding protein 1 (IRAKIBPI, also known as mouse pelle-like kinase (SIMPL) specifically inhibits the TNF-a-dependentTNFRl-dependent response in mouse embryo fibroblasts [31,36] and in mouse hematopoietic progenitors [37]. In this study, we showed thatthe downregulation of IRAKIBPI by siRNA transfection blocked NF-KB activation, proliferation and ERKl g/ activation which were induced by the addition of TNF-a in hBMSCs.…”
Section: Discussionmentioning
confidence: 99%
“…Refer to Benson et al (2010) report and our previous report (Zou, Chan, Shelley, & Yoder, 2006;Zou, Hu, & Wu, 2007). In summary, for primitive erythroid progenitor (BFU-E and CFU-E) assays, mouse BMMNCs were cultured in 0.9% methylcellulose, 15% FCS with SCF (100 ng/ml), IL-3 (1 ng/ml), and Epo (5 U/ml).…”
Section: Assays For Hematopoietic Progenitorsmentioning
confidence: 99%
“…In the serum of mice with hematopoietic dysfunction, PH ameliorated increases in the levels of TNF-α and MIP-1α. TNF-α is a negative regulator of hematopoiesis and can inhibit the proliferation of HPCs [46] and reduce the proliferation and differentiation of HSCs [47]. MIP-1α, derived from monocytes, neutrophils, and lymphocytes, can inhibit HSPCs proliferation [48].…”
Section: Discussionmentioning
confidence: 99%