Actions of NPY, and its Y1 and Y2 receptors on pulsatile growth hormone secretion during the fed and fasted state

Lili Huang, Hwee Y. Tan, Matthew J. Fogarty, Zane B. Andrews, Johannes D. Veldhuis, Herbert Herzog, Frederik J. Steyn, Chen Chen

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


The hypothalamic NPY system plays an important role in regulating food intake and energy expenditure. Different biological actions of NPY are assigned to NPY receptor subtypes. Recent studies demonstrated a close relationship between food intake and growth hormone (GH) secretion; however, the mechanism through which endogenous NPY modulates GH release remains unknown. Moreover, conclusive evidence demonstrating a role for NPY and Y-receptors in regulating the endogenous pulsatile release of GH does not exist. We used genetically modified mice (germline Npy, Y1, and Y2 receptor knock-out mice) to assess pulsatileGHsecretion under both fed and fasting conditions. Deletion ofNPYdid not impact fedGHrelease; however, it reversed the fasting-induced suppression of pulsatileGHsecretion. The recovery ofGHsecretion was associated with a reduction in hypothalamic somatotropin release inhibiting factor (Srif; somatostatin) mRNA expression. Moreover, observations revealed a differential role for Y1 and Y2 receptors, wherein the postsynaptic Y1 receptor suppressesGHsecretion in fasting. In contrast, the presynaptic Y2 receptor maintains normalGHoutput under long-term ad libitum-fed conditions. These data demonstrate an integrated neural circuit that modulates GH release relative to food intake, and provide essential information to address the differential roles of Y1 and Y2 receptors in regulating the release of GH under fed and fasting states.

Original languageEnglish (US)
Pages (from-to)16309-16319
Number of pages11
JournalJournal of Neuroscience
Issue number49
StatePublished - Dec 3 2014


  • Fasting
  • Feeding
  • Growth hormone
  • NPY
  • NPY-receptors
  • Somatostatin

ASJC Scopus subject areas

  • Neuroscience(all)


Dive into the research topics of 'Actions of NPY, and its Y1 and Y2 receptors on pulsatile growth hormone secretion during the fed and fasted state'. Together they form a unique fingerprint.

Cite this