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Pyridine nucleotides. III. Response of dog thyroid pyridine nucleotides to hormonal control


Pyridine nucleotides. III. Response of dog thyroid pyridine nucleotides to hormonal control



Biochim Biophys Acta 141(1): 8-18



TPN+levels in dog thyroid slices appear to be elevated above control values when these tissues are exposed to thyroid-stimulating hormone (TSH) and cholinergic agents. It has been uncertain as to whether these hormone effects are due to an increased synthesis de novo of TPN+ or an inhibition of TPN+ degradation. This question has been evaluated through a study of the rate of incorporation of [32p] orthophosphate and [14C] nicotinic acid into DPN+ and TPN+ in the presence and absence of TSH and cholinergic agents. The specific activity data show an enhanced synthesis de novo of TPN+ with no apparent concomitant enhancement of DPN+ formation. Although these data suggest a specific stimulation of the DPN+ kinase step, the possibility of pool dilution effects does not permit such an absolute assignment.

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