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AMP-activated kinase links serotonergic signaling to glutamate release for regulation of feeding behavior in C. elegans.


ABSTRACT: Serotonergic regulation of feeding behavior has been studied intensively, both for an understanding of the basic neurocircuitry of energy balance in various organisms and as a therapeutic target for human obesity. However, its underlying molecular mechanisms remain poorly understood. Here, we show that neural serotonin signaling in C. elegans modulates feeding behavior through inhibition of AMP-activated kinase (AMPK) in interneurons expressing the C. elegans counterpart of human SIM1, a transcription factor associated with obesity. In turn, glutamatergic signaling links these interneurons to pharyngeal neurons implicated in feeding behavior. We show that AMPK-mediated regulation of glutamatergic release is conserved in rat hippocampal neurons. These findings reveal cellular and molecular mediators of serotonergic signaling.

SUBMITTER: Cunningham KA 

PROVIDER: S-EPMC3413480 | biostudies-literature | 2012 Jul

REPOSITORIES: biostudies-literature

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AMP-activated kinase links serotonergic signaling to glutamate release for regulation of feeding behavior in C. elegans.

Cunningham Katherine A KA   Hua Zhaolin Z   Srinivasan Supriya S   Liu Jason J   Lee Brian H BH   Edwards Robert H RH   Ashrafi Kaveh K  

Cell metabolism 20120701 1


Serotonergic regulation of feeding behavior has been studied intensively, both for an understanding of the basic neurocircuitry of energy balance in various organisms and as a therapeutic target for human obesity. However, its underlying molecular mechanisms remain poorly understood. Here, we show that neural serotonin signaling in C. elegans modulates feeding behavior through inhibition of AMP-activated kinase (AMPK) in interneurons expressing the C. elegans counterpart of human SIM1, a transcr  ...[more]

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