Objective: GH secretagogues and GH-releasing hormone (GHRH) exert a complex cross-talk at the somatotrope cell, and undertake homologous and heterologous desensitization. On the other hand, the discovery of ghrelin as a new factor implicated in the regulation of GH secretion makes a thorough assessment of its properties and cell biology processes mandatory. In order to implement this, three different testing schedules were devised using the administration, on the same day, of two GH stimuli administered in sequential order 120 min apart.
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