Down-regulation of ID2 by all-trans retinoic acid in monocytic leukemia cells (THP-1).
Accumulated evidence supports that both Id helix-loop-helix proteins and derivatives of vitamin A, retinoids, play a pivotal role in the regulation of cell growth and differentiation. We analyzed the effects of all-trans retinoic acid (atRA) on the gene and protein expression of Id2 in THP-1 cells and found a suppression of the levels of Id2. The down-regulation was abolished towards a constitutively expressed level of Id2 mRNA. The decreased level of Id2 was associated with growth suppression and does support the prevalent conception of the action of Id2 as a stimulator of cell growth.
Division of Biomedicine, Department of Caring Sciences, University of Orebro, Orebro, Sweden. Dick.Wagsater@ivo.oru.se
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D002454:Cell Differentiation; D045744:Cell Line, Tumor; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism*; D015536:Down-Regulation / Q000187:drug effects*; D015973:Gene Expression Regulation, Leukemic / Q000187:drug effects*; D006801:Humans; D051797:Inhibitor of Differentiation Protein 2; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins; D013997:Time Factors; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism*; D014212:Tretinoin / Q000494:pharmacology*
D004268:DNA-Binding Proteins; C497450:ID2 protein, human; D051797:Inhibitor of Differentiation Protein 2; D012333:RNA, Messenger; D012097:Repressor Proteins; D014157:Transcription Factors; D014212:Tretinoin