Spatial and temporal activation of brain regions in hibernation:: c-fos expression during the hibernation bout in thirteen-lined ground squirrel

被引:52
作者
Bratincsak, Andras
McMullen, David
Miyake, Shinichi
Toth, Zsuzsanna E.
Hallenbeck, John M.
Palkovits, Miklos
机构
[1] NIMH, LOG, NIH, Washington, DC 20009 USA
[2] Semmelweis Univ, Neuromorphol Lab, H-1094 Budapest, Hungary
[3] Natl Inst Neurol Disorders & Stroke, Stroke Branch, NIH, Bethesda, MD 20892 USA
关键词
hibernation bout; thermoregulation; c-fos; choroid plexus; ependyma; tanycytes; preoptic nucleus;
D O I
10.1002/cne.21507
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Hibernation results in dramatic changes in body temperature and metabolism; however, the central nervous system remains active during deep torpor. By cloning c-fos cDNA from the 13-lined ground squirrel (Spermophilus tridecemlineatus) and using squirrel c-fos mRNA probe for in situ hybridization histochemistry, we systematically analyzed and identified specific brain regions that were activated during six different phases of the hibernation bout. During entrance into torpor, we detected activation of the ventrolateral subdivision of the medial preoptic area ('thermoregulatory center'), and the reticular thalamic nucleus, which is known to inhibit the somatomotor cortex. During torpor, c-fos expression in the cortex was suppressed while the reticular thalamic nucleus remained uniformly active. Throughout torpor the suprachiasmatic nucleus ('biological clock') showed increasing activity, likely participating in phase-change regulation of the hibernation bout. Interestingly, during torpor very strong c-fos activation was seen in the epithelial cells of the choroid plexus and in tanycytes at the third ventricle, both peaking near the beginning of arousal. In arousal, activity of the suprachiasmatic and reticular thalamic nuclei and choroid epithelial cells diminished, while ependymal cells in the lateral and fourth ventricles showed stronger activity. Increasing body temperature during arousal was driven by the activation of neurons in the medial part of the preoptic area. In interbout awake animals, we demonstrated the activation of hypothalamic neurons located in the arcuate nucleus and the dorsolateral hypothalamus, areas involved in food intake. Our observations indicate that the hibernation bout is closely regulated and orchestrated by specific regions of the central nervous system.
引用
收藏
页码:443 / 458
页数:16
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