LOCALIZATION OF NICOTINAMIDE ADENINE-DINUCLEOTIDE PHOSPHATE-DIAPHORASE ACTIVITY IN ELECTROSENSORY AND ELECTROMOTOR SYSTEMS OF A GYMNOTIFORM TELEOST, APTERONOTUS-LEPTORHYNCHUS

被引:44
|
作者
TURNER, RW
MOROZ, LL
机构
[1] UNIV CALGARY, DEPT ANAT, CALGARY, AB T2N 4N1, CANADA
[2] BYELORUSSIAN STATE UNIV, DEPT PHYSIOL, MINSK 220080, BELARUS
关键词
NITRIC OXIDE; GYMNOTID; ELECTRIC FISH;
D O I
10.1002/cne.903560209
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
The distribution of nicotinamide adenine dinucleotide phosphate-diaphorase (NADPH-d) activity was determined in electrosensory and electromotor systems of the weakly electric gymnotiform teleost Apteronotus leptorhynchus as an indicator of putative nitric oxide synthase-containing cells. NADPH-d activity was detected in electroreceptors and in afferent nerves of both ampullary and type I and type II tuberous organs. All cell bodies within the anterior lateral line nerve ganglion were positive for NADPH-d activity, as were the primary afferent axons and termination fields in the medullary electrosensory lateral line lobe. In the corpus cerebelli and valvula cerebelli, NADPH-d label was present in Purkinje cell somata, messy fiber synaptic glomeruli, granule cells, and parallel fibers. In the midbrain, NADPH-d activity was apparent in layer VIIIB of the torus semicircularis dorsalis and in electrosensory laminae of the optic tectum. NADPH-d was particularly associated with diencephalic electrosensory and electromotor nuclei, including the prepacemaker nucleus, the nucleus subelectrosensorius, and the central posterior nucleus of the thalamus. Intense NADPH-d activity was present in pacemaker and relay cells of the medullary pacemaker nucleus but was absent from a novel class of smaller cells in this structure. Relay cell axons and spinal electromotor neurons and their axons within the electric organ were positive for NADPH-d activity. These results indicate that putative nitric oxide synthase-containing neurons in Apteronotus are localized preferentially to electrose!nsory and electromotor structures, suggesting a role for nitric oxide in determining the activity of cells involved in detecting or generating weakly electric fields. (C) 1995 Wiley-Liss, Inc.
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收藏
页码:261 / 274
页数:14
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