Peptide YY regulates bone turnover in rodents

Katherine E Wortley, Karen Garcia, Haruka Okamoto, Karen Thabet, Keith D Anderson, Victor Shen, Jim P Herman, David M Valenzuela, George D Yancopoulos, Matthias H Tschop, Andrew J Murphy, Mark W Sleeman

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64 Citations (Scopus)

Abstract

BACKGROUND AIMS: Peptide YY (PYY) and pancreatic polypeptide (PPY) are members of the neuropeptide Y peptide family. The neuropeptide Y receptor signaling pathway has been implicated in a number of physiologic processes, including the regulation of energy balance and bone mass. To investigate the contribution of endogenous PYY and PPY to these processes, we generated both Pyy- and Ppy-deficient mice. METHODS: Pyy(-/-) and Ppy(-/-) mice and their respective wild-type littermates were studied from 8 weeks to 9 months of age. Food intake, metabolic parameters, and locomotor activity were monitored using indirect calorimetry. Body composition and bone parameters were analyzed using dual energy x-ray absorptiometry, histomorphometry, and vertebral compression testing. RESULTS: Studies in these mice showed an osteopenic phenotype specific to the Pyy-deficient line, which included a reduction in trabecular bone mass and a functional deficit in bone strength. Furthermore, female Pyy(-/-) mice showed a greater sensitivity to ovariectomy-induced bone loss compared with wild-type littermates. No food intake or metabolic phenotype was apparent in male or female Pyy(-/-) mice on standard chow. However, female Pyy(-/-) mice on a high-fat diet showed a greater propensity to gain body weight and adiposity. No metabolic or osteopenic phenotype was observed in Ppy-deficient mice. CONCLUSIONS: These results indicate that endogenous PYY plays a critical role in regulating bone mass. In comparison, its role in regulating body weight is minor and is confined to situations of high-fat feeding.
Original languageEnglish
Pages (from-to)1534 - 1543
Number of pages10
JournalGastroenterology
Volume133
Issue number5
DOIs
Publication statusPublished - 2007

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