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- W1997111946 abstract "Experiments in vascular smooth muscle cells (SMCs) indicate that the transcription factor cAMP response element-binding protein (CREB), the cyclic nucleotide response element-binding protein, suppresses expression of the platelet-derived growth factor-alpha receptor gene (PDGFRalpha). Adenovirus-mediated expression of constitutively active CREB mutants decreases PDGFRalpha mRNA, PDGFRalpha protein, and PDGFRalpha promoter-luciferase reporter activity in cultured SMCs. Expression of dominant negative CREB protein, A-CREB, increases PDGFRalpha protein content and the PDGFRalpha-promoter activity in SMCs. Active CREB prevents activation of PDGFRalpha promoter-luciferase reporter activity by CCAAT/enhancer-binding protein-delta (C/EBPdelta), shown to mediate IL-1beta stimulation of PDGFRalpha expression. Exposure of cultured SMCs to high glucose or reactive oxidant stress, which decrease CREB protein content and activity, increases PDGFRalpha protein content and promoter activity. Expression of active CREB blunts reactive oxidant stress-induced PDGFRalpha accumulation in SMCs. Loss of CREB protein in aortic walls of rats with streptozotocin-induced diabetes is accompanied by an increase in PDGFRalpha content. In Ob/Ob mice (which demonstrate reduced aortic wall CREB content vs. Ob/- controls), treatment with the peroxisomal proliferator-activated receptor gamma rosiglitazone increases CREB content and decreases PDGFRalpha content in the aortic wall. Thus, both in vitro and in vivo loss of CREB content and activity and subsequent accumulation of PDGFRalpha may contribute to SMC activation during diabetes." @default.
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- W1997111946 date "2002-08-01" @default.
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- W1997111946 title "Content and Activity of cAMP Response Element-Binding Protein Regulate Platelet-Derived Growth Factor Receptor-α Content in Vascular Smooth Muscles" @default.
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