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Stress- and diet-induced fat gain is controlled by NPY in catecholaminergic neurons

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2014

Molecular Metabolism 16 May 2014 (10.1016/j.molmet.2014.05.001)

Stress- and diet-induced fat gain is controlled by NPY in catecholaminergic neurons

L Zhang;ICJ Lee;RF Enriquez;J Lau;LH Vähätalo;PA Baldock;E Savontaus;H Herzog

Neuroscience Division, Garvan Institute of Medical Research, St Vincent's Hospital, Sydney 2010, Australia Faculty of Medicine, UNSW Australia, Sydney 2052, Australia

Service type: Knock-in mice

Abstract

Neuropeptide Y (NPY) and noradrenaline are commonly co-expressed in sympathetic neurons. Both are key regulators of energy homeostasis and critical for stress-coping. However, little is known about the specific function of NPY in the catecholaminergic system in these regulations. Here we show that mice with NPY expression only in the noradrenergic and adrenergic cells of the catecholaminergic system (catNPY) exhibited exacerbated diet-induced obesity, lower body and brown adipose tissue temperatures compared to WT and NPY−/− mice under a HFD. Furthermore, chronic stress increased adiposity and serum corticosterone level in WT but not NPY−/− mice. Re-introducing NPY specifically to the catecholaminergic system in catNPY mice restored stress responsiveness associated with increased respiratory exchange ratio and decreased liver pACC to tACC ratio. These results demonstrate catecholaminergic NPY signalling is critical in mediating diet- and chronic stress-induced fat gain via effects on diet-induced thermogenesis and stress-induced increases in corticosterone levels and lipogenic capacity.

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