title: Thiazolidinediones down-regulate plasminogen activator inhibitor type 1 expression in human vascular endothelial cells: A possible role for PPARgamma in endothelial function.
abstract: The effect of peroxisome proliferator-activated receptor (PPAR) gamma activators, thiazolidinediones, on plasminogen activator type 1 (PAI-1) was examined in cultured human umbilical vein endothelial cells (HUVEC). Tumor necrosis factor alpha (TNF-alpha) enhanced PAI-1 secretion and mRNA expression by approximately 2-fold. The thiazolidinediones, troglitazone and pioglitazone, decreased basal and TNF-alpha-stimulated PAI-1 secretion and mRNA expression in HUVEC in a dose-dependent fashion. PPARgamma mRNA in HUVEC could be detected by reverse transcriptase-polymerase chain reaction using specific primers. These results suggest that PPARgamma may regulate PAI-1 expression in HUVEC and that thiazolidinediones have a therapeutic potential for improving endothelial dysfunction observed in insulin resistance.
mesh_terms: D001483:Base Sequence; D002478:Cells, Cultured; D002839:Chromans / Q000494:pharmacology*; D017931:DNA Primers; D015536:Down-Regulation / Q000187:drug effects*; D004730:Endothelium, Vascular / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D006801:Humans; D000077205:Pioglitazone; D017395:Plasminogen Activator Inhibitor 1 / Q000235:genetics*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D018160:Receptors, Cytoplasmic and Nuclear / Q000502:physiology*; D013844:Thiazoles / Q000494:pharmacology*; D045162:Thiazolidinediones; D014157:Transcription Factors / Q000502:physiology*; D000077288:Troglitazone; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology