Academic and Research Staff
نویسنده
چکیده
In an earlier study Gruberg and Solish showed that salamander somatosensory spino-tectal fibers took the same course and ended in the same layer of the intermediate tectal neuropil as 5-hydroxytryptamine (5-HT or serotonin) fibers as seen by Falck-Hillarp fluorescence. In order to determine whether the spino-tectal fibers are themselves serotonergic, we have carried out anatomical, biochemical, genetic and physiological tests. By using a specific 5-HT fiber poison, 5,7-dihydroxytryptamine (5,7-DHT), we have been able to abolish electrically recorded contralateral somatosensory units while the overlying visual units appear normal. 5,7-DHT poisoning also abolished 5-HT fluorescence in the intermediate tectal neuropil. Genetically eyeless salamanders, or normal salamanders bilaterally enucleated early in development, have a shift in their somatosensory input to the superficial tectum. There is the same shift in Falck-Hillarp serotonin fluorescence. This shift is not due to a sprouting of 5-HT fibers. With the use of high-performance liquid chromatography, we have found the same amount of tectal serotonin in normal and eyeless salamanders. We have traced the origins of the spino-tectal cells by using HRP tectal
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