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[Mechanical stretching inhibits adipocyte differentiation of 3T3-L1 cells: the molecular mechanism and pharmacological regulation].
Nihon Yakurigaku Zasshi. Folia Pharmacologica Japonica 2004 November
Obesity frequently promotes a variety of cardiovascular diseases including atherosclerosis, hypertension, and type 2 diabetes. In a view of both the preventive and therapeutic aspects of the abovementioned diseases, most intensive clinical interventions have been primarily directed at decreasing excessive amounts of fat tissue by a change in the balance between intake and expenditure of energy; such changes are typically effected via daily exercise and diet control. Mechanical stimuli such as stretching and rubbing of fat tissues using gymnastic exercises or massage are believed to decrease obesity; however, there is no report concerning the direct effect of the mechanical stimulation on adipocytes. Here, we demonstrated that cyclic stretch inhibited adipocyte differentiation of mouse 3T3-L1 cells, which was attributable to a reduced expression of adipogenic transcription factor peroxisome proliferator-activated receptor (PPAR)gamma(2) via the activation of an extracellular signal-regulated protein kinase (ERK) pathway. The inhibitory effect of the cyclic stretching on the differentiation of 3T3-L1 cells could be restored by troglitazone, a synthetic ligand for PPARgamma. Our results provide a molecular basis for the physiological significance of the local application of mechanical stimuli to fat tissues, which is totally independent of a mechanism for systemic energy consumption.
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