Bace1-dependent amyloid processing regulates hypothalamic leptin sensitivity in obese mice

Paul J. Meakin, Susan M. Jalicy, Gemma Montagut , David J. P. Allsop, Daniella L. Cavellini, Stuart W. Irvine, Christopher McGinley, Mary K. Liddell, Alison D. McNeilly, Karolina Parmionova, Yu-Ru Liu, Charlotte S. L. Bailey, J. Kim Dale, Lora K. Heisler, Rory J. McCrimmon, Michael L. J. Ashford

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)
191 Downloads (Pure)

Abstract

Obesity places an enormous medical and economic burden on society. The principal driver appears to be central leptin resistance with hyperleptinemia. Accordingly, a compound that reverses or prevents leptin resistance should promote weight normalisation and improve glucose homeostasis. The protease Bace1 drives beta amyloid (Aβ) production with obesity elevating hypothalamic Bace1 activity and Aβ 1-42 production. Pharmacological inhibition of Bace1 reduces body weight, improves glucose homeostasis and lowers plasma leptin in diet-induced obese (DIO) mice. These actions are not apparent in ob/ob or db/db mice, indicating the requirement for functional leptin signalling. Decreasing Bace1 activity normalises hypothalamic inflammation, lowers PTP1B and SOCS3 and restores hypothalamic leptin sensitivity and pSTAT3 response in obese mice, but does not affect leptin sensitivity in lean mice. Raising central Aβ 1-42 levels in the early stage of DIO increases hypothalamic basal pSTAT3 and reduces the amplitude of the leptin pSTAT3 signal without increased inflammation. Thus, elevated Aβ 1-42 promotes hypothalamic leptin resistance, which is associated with diminished whole-body sensitivity to exogenous leptin and exacerbated body weight gain in high fat fed mice. These results indicate that Bace1 inhibitors, currently in clinical trials for Alzheimer's disease, may be useful agents for the treatment of obesity and associated diabetes.

Original languageEnglish
Article number55
Pages (from-to)55
Number of pages16
JournalScientific Reports
Volume8
Issue number1
DOIs
Publication statusPublished - 8 Jan 2018

Keywords

  • Hypothalamus
  • Obesity

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