Abstract
We studied the regulation of the expression of vascular endothelial growth factor (VEGF) by TSH in monolayer cultures of rat thyroid FRTL-5 cell lines. The VEGF mRNA synthesis was significantly inhibited by TSH as well as dibutyryl cyclic adenosine monophosphate (cAMP) in a dose-dependent manner in FRTL-5 cells. This observation is contrary to previously published results using the thyroid follicular culture system. Our results suggest that the direct effect of TSH/cAMP is to inhibit the VEGF synthesis in monolayer cells.
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