Effects of metformin and oleic acid on adipocyte expression of resistin.
Diabetes Obes Metab
; 8(1): 105-9, 2006 Jan.
Article
em En
| MEDLINE
| ID: mdl-16367888
ABSTRACT
AIM:
The adipocyte-secreted hormone resistin has been implicated in obesity-induced insulin resistance and type 2 diabetes, but pharmacological and dietary factors that regulate resistin gene expression and the effects of resistin on cellular glucose uptake in muscle have not been clearly defined.METHODS:
Expression of resistin mRNA was studied in differentiated 3T3-L1 adipocytes by using real-time semiquantitative reverse transcription-polymerase chain reaction. The effects of resistin on insulin-stimulated and insulin-independent 2-deoxyglucose uptake were evaluated in L6 muscle cells.RESULTS:
Insulin 1 microm and rosiglitazone 10 microm markedly reduced resistin mRNA expression (relative to the control gene TF2D) by 4.7-fold (p < 0.05) and 5.3-fold (p < 0.02), respectively. Similar reductions in resistin mRNA were demonstrated with metformin 100 microm (6.2-fold reduction, p < 0.02) and oleic acid 100 microm (3.9-fold reduction, p < 0.03). Resistin 1 microm significantly reduced maximum insulin-stimulated 2-deoxyglucose uptake in L6 cells from 634 to 383% (relative to 100% for control, p < 0.001), and co-administration of rosiglitazone had no effect on resistin-induced insulin resistance. In the absence of insulin, however, resistin increased glucose uptake dose-dependently (e.g., 1.75-fold at 5 microm, p < 0.001) via a mitogen-activated protein kinase-dependent pathway.CONCLUSIONS:
These results demonstrate that various glucose-lowering therapies and oleic acid reduce resistin gene expression in isolated adipocytes, and that resistin impairs insulin-stimulated glucose uptake in skeletal muscle-derived cells.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Adipócitos
/
Ácido Oleico
/
Resistina
/
Hipoglicemiantes
/
Metformina
Limite:
Animals
Idioma:
En
Revista:
Diabetes Obes Metab
Ano de publicação:
2006
Tipo de documento:
Article