Pancreatic polypeptide controls energy homeostasis via Npy6r signaling in the suprachiasmatic nucleus in mice

Cell Metab. 2014 Jan 7;19(1):58-72. doi: 10.1016/j.cmet.2013.11.019.


Y-receptors control energy homeostasis, but the role of Npy6 receptors (Npy6r) is largely unknown. Young Npy6r-deficient (Npy6r(-/-)) mice have reduced body weight, lean mass, and adiposity, while older and high-fat-fed Npy6r(-/-) mice have low lean mass with increased adiposity. Npy6r(-/-) mice showed reduced hypothalamic growth hormone releasing hormone (Ghrh) expression and serum insulin-like growth factor-1 (IGF-1) levels relative to WT. This is likely due to impaired vasoactive intestinal peptide (VIP) signaling in the suprachiasmatic nucleus (SCN), where we found Npy6r coexpressed in VIP neurons. Peripheral administration of pancreatic polypeptide (PP) increased Fos expression in the SCN, increased energy expenditure, and reduced food intake in WT, but not Npy6r(-/-), mice. Moreover, intraperitoneal (i.p.) PP injection increased hypothalamic Ghrh mRNA expression and serum IGF-1 levels in WT, but not Npy6r(-/-), mice, an effect blocked by intracerebroventricular (i.c.v.) Vasoactive Intestinal Peptide (VPAC) receptors antagonism. Thus, PP-initiated signaling through Npy6r in VIP neurons regulates the growth hormone axis and body composition.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adiposity
  • Animals
  • Body Weight
  • Corticosterone / metabolism
  • Diet
  • Energy Metabolism*
  • Feeding Behavior
  • Fertility
  • Homeostasis*
  • Insulin-Like Growth Factor I / metabolism
  • Ligands
  • Mice
  • Mice, Inbred C57BL
  • Obesity / blood
  • Obesity / pathology
  • Pancreatic Polypeptide / metabolism*
  • Receptors, Gastrointestinal Hormone / deficiency
  • Receptors, Gastrointestinal Hormone / metabolism*
  • Receptors, Neuropeptide Y / deficiency
  • Receptors, Neuropeptide Y / metabolism*
  • Signal Transduction*
  • Suprachiasmatic Nucleus / metabolism*
  • Suprachiasmatic Nucleus / pathology
  • Thinness / blood
  • Thinness / pathology
  • Vasoactive Intestinal Peptide / metabolism


  • Ligands
  • Npy6r protein, mouse
  • Receptors, Gastrointestinal Hormone
  • Receptors, Neuropeptide Y
  • Vasoactive Intestinal Peptide
  • Pancreatic Polypeptide
  • Insulin-Like Growth Factor I
  • Corticosterone