title: The effect of thyroid hormones on the white adipose tissue gene expression of PAI-1 and its serum concentration.
abstract: Metabolic syndrome is associated with an increased risk of developing cardiovascular diseases and Plasminogen activator inhibitor 1 (PAI-1) overexpression may play a significant role in this process. A positive correlation between adipose tissue gene expression of PAI-1 and its serum concentration has been reported. Furthermore, high serum levels of thyroid hormones (T3 and T4) and PAI-1 have been observed in obese children. The present study evaluates the impact of thyroid hormone treatment on white adipose tissue PAI-1 gene expression and its serum concentration. Male Wistar rats (60 days old) were treated for three weeks with T4 (50 microg/day, Hyper) or with saline (control). Additionally, 3T3-L1 adipocytes were treated for 24 h with T4 (100 nM) or T3 (100 nM). PAI-1 gene expression was determined by real-time PCR, while the serum concentration of PAI-1 was measured by ELISA using a commercial kit (Innovative Research, USA). Both the serum concentration of PAI-1 and mRNA levels were similar between groups in retroperitoneal and epididymal white adipose tissue. Using 3T3-L1 adipocytes, in vitro treatment with T4 and T3 increased the gene expression of PAI-1, suggesting non-genomic and genomic effects, respectively. These results demonstrate that thyroid hormones have different effects in vitro and in vivo on PAI-1 gene expression in adipocytes.
authors.affiliation: Disciplina de Fisiologia da Nutrição, Departamento de Fisiologia, Universidade Federal de São Paulo, São Paulo, SP, Brasil.
authors.forename: C
authors.initials: C
authors.lastname: Biz
authors.forename: C
authors.initials: C
authors.lastname: Oliveira
authors.forename: A B M
authors.initials: AB
authors.lastname: Mattos
authors.forename: J
authors.initials: J
authors.lastname: Oliveira
authors.forename: E B
authors.initials: EB
authors.lastname: Ribeiro
authors.forename: C M
authors.initials: CM
authors.lastname: Oller do Nascimento
authors.forename: L M
authors.initials: LM
authors.lastname: Oyama
mesh_terms: D041721:3T3-L1 Cells; D017667:Adipocytes / Q000187:drug effects / Q000378:metabolism; D052436:Adipose Tissue, White / Q000187:drug effects* / Q000378:metabolism; D000818:Animals; D004797:Enzyme-Linked Immunosorbent Assay; D015870:Gene Expression / Q000187:drug effects* / Q000235:genetics; D008297:Male; D051379:Mice; D017395:Plasminogen Activator Inhibitor 1 / Q000097:blood / Q000235:genetics / Q000378:metabolism*; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D013974:Thyroxine / Q000494:pharmacology*; D014284:Triiodothyronine / Q000494:pharmacology*
chemical_list: D017395:Plasminogen Activator Inhibitor 1; D012333:RNA, Messenger; D014284:Triiodothyronine; D013974:Thyroxine