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001-es BibID:	BIBFORM029088
Első szerző:	Birinyi András (anatómus, neurobiológus)
Cím:	Zinc co-localizes with GABA and glycine in synapses in the lamprey spinal cord / Birinyi A., Parker D., Antal M., Shupliakov O.
Dátum:	2001
ISSN:	0021-9967
Megjegyzések:	The presence of zinc in synaptic terminals in the lamprey spinal cord was examined utilizing a modification of the Timm's sulfide silver method and with the fluorescent marker 6-methoxy-8-quinolyl-p-toluenesulfonamide (TSQ). Axons labeled with a Timm's staining method were predominantly located in the lateral region of the dorsal column. This correlated with a maximum of TSQ fluorescence in this region of the spinal cord. Single labeled terminals accumulating Timm reaction product were also found throughout the gray matter and fiber tracts. At the ultrastructural level, zinc was located in a population of synaptic terminals that co-localized gamma-aminobutyric acid (GABA) and glycine. Possible effects of Zn2+ on neuronal activity were examined. In spinobulbar interneurons, which receive GABAergic input in the dorsal column, zinc potentiated responses to GABA application, but it did not affect responses to GABA in motoneurons. Responses in motoneurons to pressure application of glycine were also not affected by Zn2+. Zinc, however, potentiated monosynaptic glycinergic inhibitory postsynaptic potentials (IPSPs) evoked in motoneurons by inhibitory locomotor network interneurons and increased frequency, but not amplitude of spontaneous miniature IPSPs recorded in the presence of tetrodotoxin (TTX), suggesting presynaptic effects. Glutamate responses and the amplitude of monosynaptic excitatory postsynaptic potentials (EPSPs) in motoneurons were reduced by zinc. These effects appeared to be mediated largely postsynaptically through an effect on the N-methyl-D-aspartate (NMDA) component of the glutamatergic input. Our results thus show that free zinc is present in inhibitory synaptic terminals in the lamprey spinal cord, and that it may function as a modulator of inhibitory synaptic transmission.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok magyar nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Journal Of Comparative Neurology. - 433 : 2 (2001), p. 208-221. -
További szerzők:	Parker, David (1960-) (vegyész) Antal Miklós (1951-) (orvos, anatómus) Shupliakov, Oleg
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001-es BibID:	BIBFORM029062
Első szerző:	Shupliakov, Oleg
Cím:	Recurrent dorsal root potentials and motoneuron morphology in the frog spinal cord / O. V. Shupliakov, M. Antal, G. Székely
Dátum:	1990
ISSN:	0304-3940
Megjegyzések:	About one third of motoneurons stimulated intracellularly evoked dorsal root potentials (DRP) in the lumbar segments of the isolated and perfused frog spinal cord. Axon collaterals were found in one of the 22 motoneurons filled with HRP (horseradish peroxidase) through the stimulating electrode. In further experiments injecting individual motoneurons with cobalt, and filling the ventral roots with HRP or cobalt, the frequency of occurrence of axon collaterals was about 2% of the number of labelled motor cells. It is suggested that the presence of motor axon collaterals is not indispensable in the generation of the DRP evoked by ventral root or motor cell stimulation.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban egyetemen (Magyarországon) készült közlemény
Megjelenés:	Neuroscience Letters. - 117 : 3 (1990), p. 289-294. -
További szerzők:	Székely György (1926-2017) (neurobiológus) Antal Miklós (1951-) (orvos, anatómus)
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat DOI
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