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Hypothalamic PKA regulates leptin sensitivity and adiposity

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  • Linghai Yang

    (University of Washington School of Medicine, 1959 North East Pacific Street, Box 357280, Seattle, Washington 98195, USA)

  • G. Stanley McKnight

    (University of Washington School of Medicine, 1959 North East Pacific Street, Box 357280, Seattle, Washington 98195, USA)

Abstract

Mice lacking the RIIβ regulatory subunit of cyclic AMP-dependent protein kinase A (PKA) display reduced adiposity and resistance to diet-induced obesity. Here we show that RIIβ knockout (KO) mice have enhanced sensitivity to leptin’s effects on both feeding and energy metabolism. After administration of a low dose of leptin, the duration of hypothalamic JAK/STAT3 signalling is increased, resulting in enhanced POMC mRNA induction. Consistent with the extended JAK/STAT3 activation, we find that the negative feedback regulator of leptin receptor signalling, Socs3, is inhibited in the hypothalamus of RIIβ KO mice. During fasting, RIIβ–PKA is activated and this correlates with an increase in CREB phosphorylation. The increase in CREB phosphorylation is absent in the fasted RIIβ KO hypothalamus. Selective inhibition of PKA activity in AgRP neurons partially recapitulates the leanness and resistance to diet-induced obesity of RIIβ KO mice. Our findings suggest that RIIβ–PKA modulates the duration of leptin receptor signalling and therefore the magnitude of the catabolic response to leptin.

Suggested Citation

  • Linghai Yang & G. Stanley McKnight, 2015. "Hypothalamic PKA regulates leptin sensitivity and adiposity," Nature Communications, Nature, vol. 6(1), pages 1-11, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9237
    DOI: 10.1038/ncomms9237
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    Cited by:

    1. Sheng Qiu & Qinan Wu & Hao Wang & Dongfang Liu & Chen Chen & Zhiming Zhu & Hongting Zheng & Gangyi Yang & Ling Li & Mengliu Yang, 2024. "AZGP1 in POMC neurons modulates energy homeostasis and metabolism through leptin-mediated STAT3 phosphorylation," Nature Communications, Nature, vol. 15(1), pages 1-18, December.

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