[Effects of space-flight factors on cytochemical characteristics of the motor analyzer neurons].

The work was designed to study metabolism of motoneurons in anterior horns of the spinal cord and sensorimotor cortex of Wistar rats after flights on Earth's satellites for 22.5 days (Kosmos-605), 19.5 days (Kosmos-782), and 18.5 days (Kosmos-936). Control rats underwent simulated space-flight factors under laboratory conditions excepting weightlessness. Rats placed in Kosmos-936 were subjected to artificial gravity (AG). They showed complete recovery of motoneuronal metabolism 25 days after landing unlike animals that had experienced weightlessness in which enhanced functional activity of the genetic apparatus was manifest as increased RNA level, protein content, and nuclei size. These finding may reflect differences of neuronal metabolism in animals experiencing weightlessness and AG. We believe they may be due to reduced static load on the locomotor system during the space flight.