Growth-related changes in cell body size and succinate dehydrogenase activity of spinal motoneurons innervating the rat soleus muscle.
Cell body sizes and oxidative enzyme (succinate dehydrogenase) activities of spinal motoneurons innervating the soleus muscle were determined in rats ranging in postnatal age from 3 to 13 weeks. The soleus motoneurons were labeled by a retrograde neuronal tracer, nuclear yellow. The mean cell body sizes of motoneurons increased from 3 to 7 weeks of age, while the mean succinate dehydrogenase activities of motoneurons decreased from 3 to 7 weeks of age. There were no changes in mean cell body size or mean succinate dehydrogenase activity of motoneurons from 7 to 13 weeks of age. An inverse relationship between cell body size and succinate dehydrogenase activity of motoneurons was observed, irrespective of age. These results indicate that motoneurons innervating the rat soleus muscle show the adult pattern of cell body size and succinate dehydrogenase activity at an earlier stage of postnatal growth, 7 weeks of age.
Ishihara
Akihiko
A
Laboratory of Neurochemistry, Graduate School of Human and Environmental Studies, Kyoto University, 606-8501, Japan. ishihara@life.h.kyoto-u.ac.jp
Kawano
Fuminori
F
Ishioka
Noriaki
N
Oishi
Hirotaka
H
Higashibata
Akira
A
Shimazu
Toru
T
Ohira
Yoshinobu
Y
D000375:Aging; D000704:Analysis of Variance; D000818:Animals; D000831:Animals, Newborn; D001562:Benzimidazoles / Q000378:metabolism; D001835:Body Weight / Q000502:physiology; D002452:Cell Count; D002455:Cell Division / Q000502:physiology; D048429:Cell Size / Q000502:physiology*; D007091:Image Processing, Computer-Assisted; D008297:Male; D009046:Motor Neurons / Q000145:classification / Q000201:enzymology* / Q000502:physiology; D018482:Muscle, Skeletal / Q000294:innervation*; D009929:Organ Size / Q000502:physiology; D051381:Rats; D017208:Rats, Wistar; D013116:Spinal Cord / Q000166:cytology / Q000502:physiology; D013385:Succinate Dehydrogenase / Q000378:metabolism*; D000096926:Benzenesulfonamides
D001562:Benzimidazoles; D013385:Succinate Dehydrogenase; C036574:nuclear yellow; D000096926:Benzenesulfonamides