title: PAI-1 produced ex vivo by human adipose tissue is relevant to PAI-1 blood level.
abstract: Human adipose tissue has been shown to produce plasminogen activator inhibitor type 1 (PAI-1). However, the importance of adipose tissue in the regulation of the PAI-1 plasma level is not known. The aim of this study was to investigate the relation between the production of PAI-1 by adipose tissue, plasma PAI-1 level, and variables related to the insulin resistance state. The link between the production of PAI-1 inducers such as tumor necrosis factor-alpha and transforming growth factor-beta and the production of PAI-1 by adipose tissue was also evaluated. Blood samples were obtained as soon as possible to the induction of anesthesia from 30 patients undergoing elective abdominoplasty. PAI-1 antigen levels measured in conditioned media after a 19-hour incubation period of adipose tissue explants were significantly correlated with plasma PAI-1 antigen levels (r=0.54, P=0.004) and with systemic lipid parameters such as triglycerides and high density lipoprotein cholesterol (r=0. 46, P=0.014; r=-0.50, P=0.01, respectively) but not with insulinemia and body mass index. PAI-1 production by adipose tissue was correlated with those of TNF-alpha (r=0.5, P=0.01) and TGF-beta (r=0. 53, P=0.007). These results emphasize the role of adipose tissue in determining plasma levels of PAI-1, with a local contribution of TNF-alpha and TGF-beta in PAI-1 production by adipose tissue.
mesh_terms: D000273:Adipose Tissue / Q000378:metabolism*; D000293:Adolescent; D000328:Adult; D000368:Aged; D015992:Body Mass Index; D008076:Cholesterol, HDL / Q000097:blood; D017077:Culture Media, Conditioned / Q000737:chemistry; D005260:Female; D005786:Gene Expression Regulation; D006801:Humans; D007328:Insulin / Q000097:blood; D007333:Insulin Resistance; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000378:metabolism* / Q000473:pathology; D009852:Omentum / Q000473:pathology; D009924:Organ Culture Techniques; D009928:Organ Specificity; D017395:Plasminogen Activator Inhibitor 1 / Q000096:biosynthesis* / Q000097:blood; D012867:Skin / Q000473:pathology; D016212:Transforming Growth Factor beta / Q000096:biosynthesis; D014280:Triglycerides / Q000097:blood; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis / Q000235:genetics