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Diabetes induces early transient changes in the content of vesicular transporte...
Baptista, Filipa I.; Gaspar, Joana M.; Cristóvão, Armando; Santos, Paulo F.; Köfalvi, Attila; Ambrósio, António F.Diabetes induces changes in neurotransmitter release in central nervous system, which depend on the type of neurotransmitter and region studied. In this study, we evaluated the effect of diabetes (two and eight weeks duration) on basal and evoked release of [14C]glutamate and [3H]GABA in hippocampal and retinal synaptosomes. We also analyzed the effect of diabetes on the protein content of vesicular glutamate a...
Diabetes changes the levels of ionotropic glutamate receptors in the rat retina
Santiago, Ana R.; Gaspar, Joana M.; Baptista, Filipa I.; Cristóvão, Armando J.; Santos, Paulo F.; Kamphuis, Willem; Ambrósio, António F.Purpose: Diabetic retinopathy (DR) is a leading cause of vision loss and blindness among adults between the age 20 to 74. Changes in ionotropic glutamate receptor subunit composition can affect retinal glutamatergic neurotransmission and, therefore, contribute to visual impairment. The purpose of this study was to investigate whether diabetes leads to changes in ionotropic glutamate receptor subunit expression ...
Up-regulation of neuropeptide Y levels and modulation of glutamate release thro...
Silva, Ana P.; Xapelli, Sara; Pinheiro, Paulo S.; Ferreira, Raquel; Lourenço, Joana; Cristóvão, Armando; Grouzmann, Eric; Cavadas, CláudiaKainate-induced epilepsy has been shown to be associated with increased levels of neuropeptide Y (NPY) in the rat hippocampus. However, there is no information on how increased levels of this peptide might modulate excitation in kainate-induced epilepsy. In this work, we investigated the modulation of glutamate release by NPY receptors in hippocampal synaptosomes isolated from epileptic rats. In the acute phase...
Development of chick retina cells in culture: cobalt entry through AMPA recepto...
Cristóvão, Armando J.; Carvalho, Caetana M.The functionality of [alpha]-amino-3-hydroxy-5-methylisoxazole-4-propionate (AMPA) receptors in chick embryo retina cells during development in vitro was studied by using Co2+ uptake, and these data were correlated with the expression of the AMPA receptor subunit GluR4. We found that at 5 h in vitro only a small number of cells took up Co2+ upon stimulation with 100 [mu]M kainate or other AMPA receptor agonists...
Expression of AMPA/kainate receptors during development of chick embryo retina ...
Cristóvão, Armando J.; Oliveira, Catarina R.; Carvalho, Caetana M.The activity and the subunit expression of [alpha]-amino-3-hydroxy-5-methylisoxazole-4-propionate (AMPA)/kainate ionotropic glutamate receptors were studied in retina cells developing in chick embryos and in retina cells cultured as retinospheroids, at the same stages of development. In the retinospheroids, the activity of the AMPA/kainate receptors was monitored by following the changes in the intracellular fr...
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