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Article: Roscovitine Enhances All-trans Retinoic Acid (atra)-induced Nuclear Enrichment Of An Ensemble Of Activated Signaling Molecules And Augments Atra-induced Myeloid Cell Differentiation

TitleRoscovitine Enhances All-trans Retinoic Acid (atra)-induced Nuclear Enrichment Of An Ensemble Of Activated Signaling Molecules And Augments Atra-induced Myeloid Cell Differentiation
Authors
KeywordsATRA
roscovitine
APL
HL-60
Lyn
Issue Date2020
PublisherImpact Journals LLC. The Journal's web site is located at http://www.impactjournals.com/oncotarget/index.html
Citation
Oncotarget, 2020, v. 11 n. 12, p. 1017-1036 How to Cite?
AbstractAlthough ATRA represents a successful differentiation therapy for APL, it is largely ineffective for non-APL AMLs. Hence combination therapies using an agent targeting ATRA-regulated molecules that drive cell differentiation/arrest are of interest. Using the HL-60 human non-APL AML model where ATRA causes nuclear enrichment of c-Raf that drives differentiation/G0-arrest, we now observe that roscovitine enhanced nuclear enrichment of certain traditionally cytoplasmic signaling molecules and enhanced differentiation and cell cycle arrest. Roscovitine upregulated ATRA-induced nuclear c-Raf phosphorylation at S259 and S289/296/301. Nuclear c-Raf interacted with RB protein and specifically with pS608RB, the hinge region phosphorylation controlling E2F binding and cell cycle progression. ATRA-induced loss of pS608RB with cell cycle arrest was associated with loss of RB-sequestered c-Raf, thereby coupling cell cycle arrest and increased availability of c-Raf to promote differentiation. Part of this mechanism reflects promoting cell cycle arrest via ATRA-induced upregulation of the p27 Kip1 CDKI. Roscovitine also enhanced the ATRA-induced nuclear enrichment of other signaling molecules traditionally perceived as cytoplasmic promoters of proliferation, but now known to promote differentiation; in particular: SFKs, Lyn, Fgr; adaptor proteins, c-Cbl, SLP-76; a guanine exchange factor, Vav1; and a transcription factor, IRF-1. Akin to c-Raf, Lyn bound to RB, specifically to pS608RB. Lyn-pS608RB association was greatly diminished by ATRA and essentially lost in ATRA plus roscovitine treated cells. Interestingly Lyn-KD enhanced such ATRA-induced nuclear signaling and differentiation and made roscovitine more effective. ATRA thus mobilized traditionally cytoplasmic signaling molecules to the nucleus where they drove differentiation which were further enhanced by roscovitine.
Persistent Identifierhttp://hdl.handle.net/10722/283756
ISSN
2016 Impact Factor: 5.168
2023 SCImago Journal Rankings: 0.789
PubMed Central ID

 

DC FieldValueLanguage
dc.contributor.authorRashid, A-
dc.contributor.authorDuan, X-
dc.contributor.authorGao, F-
dc.contributor.authorYang, M-
dc.contributor.authorYen, A-
dc.date.accessioned2020-07-03T08:23:37Z-
dc.date.available2020-07-03T08:23:37Z-
dc.date.issued2020-
dc.identifier.citationOncotarget, 2020, v. 11 n. 12, p. 1017-1036-
dc.identifier.issn1949-2553-
dc.identifier.urihttp://hdl.handle.net/10722/283756-
dc.description.abstractAlthough ATRA represents a successful differentiation therapy for APL, it is largely ineffective for non-APL AMLs. Hence combination therapies using an agent targeting ATRA-regulated molecules that drive cell differentiation/arrest are of interest. Using the HL-60 human non-APL AML model where ATRA causes nuclear enrichment of c-Raf that drives differentiation/G0-arrest, we now observe that roscovitine enhanced nuclear enrichment of certain traditionally cytoplasmic signaling molecules and enhanced differentiation and cell cycle arrest. Roscovitine upregulated ATRA-induced nuclear c-Raf phosphorylation at S259 and S289/296/301. Nuclear c-Raf interacted with RB protein and specifically with pS608RB, the hinge region phosphorylation controlling E2F binding and cell cycle progression. ATRA-induced loss of pS608RB with cell cycle arrest was associated with loss of RB-sequestered c-Raf, thereby coupling cell cycle arrest and increased availability of c-Raf to promote differentiation. Part of this mechanism reflects promoting cell cycle arrest via ATRA-induced upregulation of the p27 Kip1 CDKI. Roscovitine also enhanced the ATRA-induced nuclear enrichment of other signaling molecules traditionally perceived as cytoplasmic promoters of proliferation, but now known to promote differentiation; in particular: SFKs, Lyn, Fgr; adaptor proteins, c-Cbl, SLP-76; a guanine exchange factor, Vav1; and a transcription factor, IRF-1. Akin to c-Raf, Lyn bound to RB, specifically to pS608RB. Lyn-pS608RB association was greatly diminished by ATRA and essentially lost in ATRA plus roscovitine treated cells. Interestingly Lyn-KD enhanced such ATRA-induced nuclear signaling and differentiation and made roscovitine more effective. ATRA thus mobilized traditionally cytoplasmic signaling molecules to the nucleus where they drove differentiation which were further enhanced by roscovitine.-
dc.languageeng-
dc.publisherImpact Journals LLC. The Journal's web site is located at http://www.impactjournals.com/oncotarget/index.html-
dc.relation.ispartofOncotarget-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectATRA-
dc.subjectroscovitine-
dc.subjectAPL-
dc.subjectHL-60-
dc.subjectLyn-
dc.titleRoscovitine Enhances All-trans Retinoic Acid (atra)-induced Nuclear Enrichment Of An Ensemble Of Activated Signaling Molecules And Augments Atra-induced Myeloid Cell Differentiation-
dc.typeArticle-
dc.identifier.emailRashid, A: arashid2@hku.hk-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.18632/oncotarget.27508-
dc.identifier.pmid32256976-
dc.identifier.pmcidPMC7105165-
dc.identifier.scopuseid_2-s2.0-85090881513-
dc.identifier.hkuros310705-
dc.identifier.volume11-
dc.identifier.issue12-
dc.identifier.spage1017-
dc.identifier.epage1036-
dc.publisher.placeUnited States-
dc.identifier.issnl1949-2553-

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