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- W4238587888 abstract "The lizard tail regenerates after autotomy or amputation. After horseradish peroxidase injections in the regenerate, motoneurons were retrogradely labeled only in the three spinal segments rostral to the amputation, whose spinal nerves are severed by tail loss. The changes in these motoneurons, compared to those of lizards with original intact tails, were investigated 5, 15, and 30 days after caudotomy and at 8 months in lizards with mature regenerates. Morphometric analysis of Nissl-stained motoneurons rostral to the amputation revealed marked hypertrophy, peaking at 15 days, when chromatolysis and nuclear eccentricity were also evident; motoneuron perikarya remained significantly larger than in controls after tail regeneration. The dUTP nick-end labeling (TUNEL) stain for apoptotic neurons did not reveal labeled cells in the spinal cord 5 and 15 days after caudotomy. Nitric oxide synthase (NOS) expression was studied with nicotinamide adenine-dinucleotide phosphate (NADPH)-diaphorase histochemistry and evaluated quantitatively with densitometry. A few caudal spinal motoneurons were lightly stained in lizards with intact tails. Induction of NADPH-diaphorase positivity was evident in the vast majority of these cells 5 days after caudotomy and was very marked at 15 and 30 days, during tail regrowth. These data were confirmed by neuronal NOS immunohistochemistry. After tail regeneration, histochemical positivity was markedly down-regulated in the tail spinal motoneurons but persisted in the majority of these cells. The findings show that in the lizard caudotomy elicits in axotomized caudal spinal motoneurons NOS induction associated with plasticity phenomena and in particular with vigorous regeneration of axons that innervate the regrowing tail. J. Comp. Neurol. 417:60–72, 2000. ©2000 Wiley-Liss, Inc." @default.
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- W4238587888 date "2000-01-31" @default.
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- W4238587888 title "Plastic changes and nitric oxide synthase induction in neurons that innervate the regenerated tail of the lizard Gekko gecko: I. Response of spinal motoneurons to tail amputation and regeneration" @default.
- W4238587888 doi "https://doi.org/10.1002/(sici)1096-9861(20000131)417:1<60::aid-cne5>3.3.co;2-g" @default.
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