A novel extracellular nucleotide receptor coupled to phosphoinositidase-C in pituitary cells.
In primary cultures of sheep pituitary cells extracellular nucleotides stimulated rapid increases in inositol tris- and bisphosphate, accompanied by intracellular Ca2+ mobilization. A similar stimulation of inositol phosphate production by extracellular nucleotides was observed in rat and baboon pituitary cells. The inositol phosphate response to nucleotides was greater than that elicited by any of the known hypothalamic releasing peptides. UTP, ATP, and ATP gamma S were the most potent agoni...Expand abstract
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