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001-es BibID:	BIBFORM018459
Első szerző:	Pál Balázs (élettanász)
Cím:	Voltage-gated and background K+ channel subunits expressed by the bushy cells of the rat cochlear nucleus / Pál B., Pór A., Pocsai K., Szücs G., Rusznák Z.
Dátum:	2005
ISSN:	0378-5955
Megjegyzések:	Bushy cells of the ventral cochlear nucleus produce a single, short latency action potential at the beginning of long depolarisations. In the present work an immunochemical survey was performed to detect the presence of K+ channel subunits which may contribute to the specific membrane properties of the bushy cells. The immunocytochemical experiments conducted on enzymatically isolated bushy cells indicated positive immunolabelling for several subunits known to be responsible for the genesis of rapidly inactivating K+ currents. Bushy cells showed strong expression of Kv3.4, 4.2 and 4.3 subunits, with the lack of Kv1.4 specific immunoreaction. The Kv3.4-specific immunoreaction had a specific, patchy appearance. Bushy cells also expressed various members of the Kv1 subunit family, most notably Kv1.1, 1.2, 1.3 and 1.6. Weak positivity could be observed for Kv3.2 subunits. The positive immunolabelling for Kv3.4, Kv4.2 and Kv4.3 was confirmed in free-floating tissue slices. Voltage-clamp experiments performed on positively identified bushy cells in brain slices corroborated the presence and activity of Kv3.4 and Kv4.2/4.3 containing K+ channels. Bushy cell showed strong immunopositivity for TASK-1 channels too. The results presented in this work indicate that bushy cells possess several types of voltage-gated K+ channel subunits whose activity may contribute to the membrane properties and firing characteristics of these neurones.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Hearing Research. - 199 : 1-2 (2005), p. 57-70. -
További szerzők:	Pór Ágnes Pocsai Krisztina (1978-) (élettanász) Szűcs Géza (1948-) (élettanász) Rusznák Zoltán (1965-) (élettanász)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM009113
Első szerző:	Pap Pál (élettanász)
Cím:	Cytoplasmic Ca2+ concentration changes evoked by cholinergic stimulation in primary astrocyte cultures prepared from the rat cochlear nucleus / Pap, P., Kőszeghy, Á., Szücs, G., Rusznák, Z.
Dátum:	2009
ISSN:	0378-5955
Megjegyzések:	The involvement of astrocytes in the cholinergic modulation of the cochlear nucleus has been studied using primary astrocyte cultures prepared from this nucleus. The cells were loaded with the membrane permeable form of the fluorescent Ca2+ indicator Fluo-4, and carbachol-induced Ca2+ concentration increases were monitored using an imaging system. In the presence of cholinergic stimulation 36.3% of the cells produced Ca2+ transients. The time course of the transients was variable; 45.0% of the responding cells showed only a rapid Ca2+ concentration increase, while in 50.5% of the astrocytes the fast component was followed by a slow plateau phase. Using muscarine as well as general and more specific cholinergic antagonists (atropine, pirenzepine, 4-DAMP and hexamethonium), the role of the M3 and (to a smaller extent) M1 muscarinic acetylcholine receptors could be demonstrated in the genesis of the carbachol-induced Ca2+ transients. The presence of these two subtypes of muscarinic receptors has been confirmed at both mRNA (Q-PCR) and protein (immunocytochemistry) levels. Our data demonstrate the responsiveness of the cochlear astrocytes towards cholinergic stimulation, suggesting that they may have roles in mediating the effects of cholinergic modulation in the rat cochlear nucleus.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban Acetylcholine antagonist Astrocyte Astrocytes Atropine Cholinergic Antagonists Cochlear Nucleus Fluo-4 glia Hexamethonium imaging immunochemistry Muscarine Muscarinic receptors Pirenzepine Q-PCR rat receptor Time
Megjelenés:	Hearing Research. - 255 : 1-2 (2009), p. 73-83. -
További szerzők:	Kőszeghy Áron (1983-) (Ph.D hallgató, élettanász) Szűcs Géza (1948-) (élettanász) Rusznák Zoltán (1965-) (élettanász)
Internet cím:	elektronikus változat elektronikus változat DOI
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