The effects of dibutyryl cyclic 3′,5′-adenosine monophosphate (DBc-AMP) on the mouse thyroid gland have been investigated in the in-vitro assay of Brown & Munro (1967). The distribution of 131I-labelled compounds in the glands and the supporting medium have been analysed by thin-layer chromatography and the changes induced by cyclic 3′,5′-adenosine monophosphate (c-AMP), DBc-AMP or thyroid-stimulating hormone (TSH) compared.
The release of 131I was increased when the glands were incubated with DBc-AMP, c-AMP or TSH. The potency of DBc-AMP was approximately 50 times that of c-AMP on a basis of molarity. Like TSH, DBc-AMP increased the proportion of iodothyronines in the system as a whole, whereas c-AMP had little effect. The possible explanations for this are discussed.
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