[Concentration of acid proteins in the nuclei of rat hypothalamic neuron and glial cell nuclei during cold adaptation].

By means of two-wave length cytospectrophotometry the acid protein content per cell was determined in the nuclei of the neurons and their glial satellite cells of the medial peroptic area and the supraoptic nucleus of the hypothalamus of rats kept at 2--4 degrees C for 1, 3, 7, or 15 days (adaptation to cold). This colling resulted in an initial decrease in the nuclear acid protein content in the whole neuron-neuroglia system of the medail preoptic area with a gradual restoration to the normal by the 15th day of constant cooling. In the glial cells of this area the acid protein content increased temporarily above the control level before the restoration to the normal. A gradual accumulation of acid proteins and its following restoration to the control level was revealed in the neuron-neuroglia system of the supraoptic nucleus. By the 15th day of the adaptation to cold the content of neuronal and glial acid proteins of this nucleus became somewhat lower than in the control.