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The effect of tri-iodothyronine (T₃) on the binding of ¹²⁵I-labelled insulin-like growth factors (IGF) to cultured arterial smooth muscle cells was investigated. When cells which were grown to confluency were incubated with ¹²⁵I-labelled IGF and different concentrations of T₃, low concentrations of T₃ (0·1–10 nmol/l) increased the binding of ¹²⁵I-labelled IGF. High concentrations of T₃ (1 µmol/l) could not induce this effect. Scatchard analysis of the binding of ¹²⁵I-labelled IGF in the presence of different concentrations of unlabelled IGF showed a high-affinity, low-capacity binding system and a second lower affinity, high-capacity binding system. In the presence of T₃ (1 nmol/l) Scatchard analysis indicated that the affinity of ¹²⁵I-labelled IGF to its binding sites was altered. After a 2-h preincubation of the cell layers with Dulbecco's Modified Eagle's Medium containing T₃ (1–100 nmol/l), the ¹²⁵I-labelled IGF binding was enhanced in a dose-dependent manner by T₃. Scatchard analysis showed a significant increase in the number of IGF binding sites.

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