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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

The subcommissural organ of the frog Rana perezi is innervated by nerve fibres containing GABA.

The innervation of the frog subcommissural organ was studied by light-microscopic and ultrastructural immunocytochemistry using antisera against serotonin, noradrenaline, dopamine, gamma-aminobutyric acid (GABA), glutamic acid decarboxylase, different GABA receptor subunits and bovine Reissner's fibre material (AFRU). In the proximity of the organ, serotonin- and noradrenaline-containing fibres were rare whereas dopamine-immunoreactive fibres were more numerous. Many GABA- and glutamic acid decarboxylase-containing nerve fibres were found at the basal portion of the ependymal cells of the subcommissural organ. Under the electron microscope, these GABA-immunolabelled nerve endings appeared to establish axoglandular synapses with secretory ependymal cells of the subcommissural organ. In addition, the secretory ependymal cells expressed high amounts of the beta2-subunit of the GABA(A) receptor. Since GABA-immunoreactive neurons were present in the frog pineal organ proper and apparently contributed axons to the pineal tract, we suggest that at least part of the GABAergic fibres innervating the frog subcommissural organ could originate from the pineal organ.[1]

References

  1. The subcommissural organ of the frog Rana perezi is innervated by nerve fibres containing GABA. Jiménez, A.J., Aller, M.I., Martín, R., Pérez-Martín, M., Pérez-Fígares, J.M., Fernández-López, A., Fernández-Llebrez, P. Cell Tissue Res. (2000) [Pubmed]
 
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