[Trace changes in the quantity of RNA in neurons and neuroglia of the hypothalamic nuclei of the brain following short-term intermittent exposure to cold].
Adult albino rats were kept for 2 minutes at --20 degrees C, then for 5 minutes at 25 degrees C, this intermittent cooling being repeated 15 times. One hour after the end of the cooling, the RNA quantity per cell was determined by means of visible cytospectrophotometry to find the increase in the cytoplasm of medial preoptic area neurons and in the nuclei of their glial satellite cells as well as in the nuclei of the perineuronal glial cells of mammillary bodies. Two days after the rats had stayed at the room temperature, these RNA changey bodies the RNA content decreased. 3 days later, the RNA content in the whole neuron--neuroglia unit of the preoptic area returned to normal, while in the neurons and neuroglia of mammillary bodies augmented markedly: this augmentation was found as late as 15 days after the cessation of the cooling. 30 days after the end of the cooling, the RNA quantity in the mammillary body neurons returned to normal, whiel in the neuroglia of this hypothalamic nucleus decreased even lower than the normal level. The authors discuss the problem of a so-called "vegetative memory" and of the involvement of hypothalamic neuron--neuroglia units in the metabolism tranformation dealing with a consolidation of this memory.
D000222:Adaptation, Physiological; D000818:Animals; D003080:Cold Temperature; D006651:Histocytochemistry; D007031:Hypothalamus / Q000378:metabolism*; D008297:Male; D008326:Mammillary Bodies / Q000378:metabolism*; D009457:Neuroglia / Q000378:metabolism; D009474:Neurons / Q000378:metabolism; D011301:Preoptic Area / Q000378:metabolism*; D012313:RNA / Q000378:metabolism*; D051381:Rats; D013053:Spectrophotometry
D012313:RNA
Sledoye izmeneniia kolichestva RNK v neĭronakh i neĭroglii gipotalamicheskikh iader golovnogo mozga posle kratkovremennogo preryvistogo vozdeĭstviia kholoda.