Atividade agonista do extrato de Tabebuia heptaphylla sobre os receptores proliferadores peroxissomais alfa (PPAR a), beta/delta (PPAR ß/d) e gama (PPAR y)

AUTOR(ES)

Viviane Cassia Pereira

DATA DE PUBLICAÇÃO

2008

RESUMO

Over recent decades, the prevalence of metabolism disorders such as metabolic syndrome, obesity and diabetes have, increased drastically, becoming a global epidemic. Therefore, new effective therapies to avoid the advance these diseases will have a great impact in the public health. Peroxisome proliferators-activated receptors (PPARs) have used as a pharmacological target for the treatment of above physiological changes. PPARs are members of the nuclear receptor superfamily of transcription factors that bind to DNA in the regulatory regions of target genes. The three isotypes, PPARα, PPAR β/δ and PPARγ act like metabolic sensors capable of adapting gene expression to integrate lipid signals with genes involved in regulation of lipid metabolism, adipogenesis, insulin sensitivity and immune response. Plants with anti-diabetic proprieties have been routinely used to screening of news modulators for PPARs activity. In Brazil, many plants have been used in folk medicine by diabetic patients to reduce the glucose levels such as Tabebuia heptaphylla (Vell) Toledo (popular known as ipê-roxo). In the current study, using reporter gene assay in U937 cells, we investigated whether extracts from the bark of Tabebuia heptaphylla are capable to activate the transcription mediated by PPAR receptor. Our results showed that the hexanic extract, but not aqueous and ethanolic extracts, significantly activated the transcription mediated by PPARα, PPAR β/δ and PPARγ. These findings suggest that Tabebuia heptaphylla may have some compounds with high agonistic activity on PPARα, PPAR β/δ and PPARγ, which may explain its use traditional as hypoglycemiant.

ASSUNTO(S)

receptores dos proliferadores peroxissomais pparα tabebuia heptaphylla dislipidemia peroxisome proliferators-activated receptors pparα , ppar β and pparγ ciencias da saude e pparγ /δ diabetes mellitus, dyslipidemia síndrome metabólica obesidade obesity metabolic syndrome /δ , ppar β diabete tabebuia heptaphylla

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