Neurons that regulate mouse torpor.

Nature
Sinisa HrvatinMichael E Greenberg

Abstract

The advent of endothermy, which is achieved through the continuous homeostatic regulation of body temperature and metabolism1,2, is a defining feature of mammalian and avian evolution. However, when challenged by food deprivation or harsh environmental conditions, many mammalian species initiate adaptive energy-conserving survival strategies-including torpor and hibernation-during which their body temperature decreases far below its homeostatic set-point3-5. How homeothermic mammals initiate and regulate these hypothermic states remains largely unknown. Here we show that entry into mouse torpor, a fasting-induced state with a greatly decreased metabolic rate and a body temperature as low as 20 °C6, is regulated by neurons in the medial and lateral preoptic area of the hypothalamus. We show that restimulation of neurons that were activated during a previous bout of torpor is sufficient to initiate the key features of torpor, even in mice that are not calorically restricted. Among these neurons we identify a population of glutamatergic Adcyap1-positive cells, the activity of which accurately determines when mice naturally initiate and exit torpor, and the inhibition of which disrupts the natural process of torpor entry, maintenan...Continue Reading

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Methods Mentioned

BETA
snRNA-seq
3 hybrid
dissection
PCR
Fluorescence
Assay

Software Mentioned

10X Genomics package cellranger
scrublet
Bonsai
TRAPed
R
Seurat
Allen Mouse Brain Atlas
FindClusters
MATLAB

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