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001-es BibID:	BIBFORM049492
Első szerző:	Hegyi Bence (élettanász)
Cím:	Selectivity problems with drugs acting on cardiac Na+ and Ca2+ channels / Bence Hegyi, István Komáromi, Péter P. Nánási, Norbert Szentandrássy
Dátum:	2013
ISSN:	0929-8673
Megjegyzések:	With the increase of our knowledge on cardioactive agents it comes more and more clear that practically none of the currently used compounds shows absolute selectivity to one or another ion channel type. This is particularly true for Na(+) and Ca(2+) channel modulators, which are widely applied in the clinical practice and biomedical research. The best example might be probably the marine guanidine poison tetrodotoxin, which has long been considered as a selective Na(+) channel blocker, while recently it turned out to effectively inhibit cardiac Ca(2+) currents as well. In the present study the cross actions observed between the effects of various blockers of Na(+) channels (such as toxin inhibitors, class I antiarrhythmics and local anesthetics) and Ca(2+) channels (like phenylalkylamines, dihydropyridine compounds, diltiazem and mibefradil) are overviewed in light of the known details of the respective channel structures. Similarly, activators of Na(+) channels, including veratridine and batrachotoxin, are also compared. The binding of tetrodotoxin and saxitoxin to Cav1.2 and Nav1.5 channel proteins is presented by construction of theoretical models to reveal common structures in their pore forming regions to explain cross reactions. Since these four domain channels can be traced back to a common ancestor, a close similarity in their structure can well be demonstrated. Thus, the poor selectivity of agents acting on cardiac Na(+) and Ca(2+) channels is a consequence of evolution. As a conclusion, since the limited selectivity is an intrinsic property of drug receptors, it has to be taken into account when designing new cardioactive compounds for either medical therapy or experimental research in the future.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban Na+ channels Ca2+ channels ion selectivity cardioactive drugs channel structures tetrodotoxin Doktori iskola
Megjelenés:	Current Medicinal Chemistry. - 20 : 20 (2013), p. 2552-2571. -
További szerzők:	Komáromi István (1957-) (vegyész, molekuláris biológus, biokémikus) Nánási Péter Pál (1956-) (élettanász) Szentandrássy Norbert (1976-) (élettanász)
Pályázati támogatás:	TÁMOP-4.2.2.A-11/1/KONV-2012-0045 TÁMOP Élettan Kutatócsoport K100151 OTKA PD101171 OTKA K101196 OTKA CNK-77855 OTKA TÁMOP-4.2.2/B-10/1-2010-0024 TÁMOP Molekuláris Orvostudomány Doktori Iskola
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001-es BibID:	BIBFORM034919
035-os BibID:	PMID:21774755 WOS:000294414700012
Első szerző:	Szentandrássy Norbert (élettanász)
Cím:	Modified cAMP derivatives : powerful tools in heart research / N. Szentandrássy, G. Harmati, V. Farkas, B. Horváth, B. Hegyi, J. Magyar, G. Szénási, I. Márton, P. P. Nánási
Dátum:	2011
ISSN:	0929-8673
Megjegyzések:	Receptor-mediated changes in intracellular cyclic AMP concentration play critical role in the autonomic control of the heart, including regulation of a variety of ion channels via mechanisms involving protein kinase A, EPAC, or direct actions on cyclic nucleotide gated ion channels. In case of any ion channel, the actual signal transduction cascade can be identified by using properly modified cAMP derivatives with altered binding and activating properties. In this study we focus to structural modifications of cAMP resulting in specific activator and blocking effects on PKA or EPAC. Involvement of the cAMP-dependent signal transduction pathway in controlling rapid delayed rectifier K(+ ) current was studied in canine ventricular myocytes using these specific cAMP analogues. Adrenergic stimulation increased the density of I(Kr) in canine ventricular cells, which effect was mediated by a PKA-dependent but EPAC-independent pathway. It was also shown that intracellular application of large concentrations of cAMP failed to fully activate PKA comparing to the effect of isoproterenol, forskolin, or PDE-resistant cAMP derivatives. This difference was fully abolished following inhibition of phosphodiesterase by IBMX. These results are in line with the concept of compartmentalized release, action, and degradation of cAMP within signalosomes.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban Adrenergic stimulation cAMP analogues dog myocytes EPAC Molekuláris Medicina intracellular compartmentalization phosphodiesterase protein kinase A rapid delayed rectifier K+ current cyclic nucleotide modified cAMP derivatives egyetemen (Magyarországon) készült közlemény
Megjelenés:	Current Medicinal Chemistry. - 18 : 24 (2011), p. 3729-3736. -
További szerzők:	Harmati Gábor (1983-) (élettanász) Farkas Viktória Horváth Balázs (1981-) (élettanász) Hegyi Bence (1987-) (élettanász) Magyar János (1961-) (élettanász) Szénási Gábor Márton Ildikó (1954-) (fogszakorvos) Nánási Péter Pál (1956-) (élettanász)
Pályázati támogatás:	TÁMOP-4.2.1/B-09/1/KONV-2010-0007 TÁMOP A feszültségfüggő K-csatornák szerepe excitábilis sejtekben
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