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001-es BibID:	BIBFORM107128
035-os BibID:	(cikkazonosító)102896 (WoS)001009016200001 (Scopus)85147540608
Első szerző:	Rehó Bálint
Cím:	Agonist-controlled competition of RAR and VDR nuclear receptors for heterodimerization with RXR is manifested in their DNA-binding / Rehó Bálint, Fadel Lina, Brazda Peter, Benziane Anass, Hegedüs Éva, Sen Pialy, Gadella Theodorus W. Jr., Tóth Katalin, Nagy László, Vámosi György
Dátum:	2023
ISSN:	0021-9258 1083-351X
Megjegyzések:	We found previously that nuclear receptors (NRs) compete for heterodimerization with their common partner, retinoid X receptor (RXR), in a ligand-dependent manner. To investigate potential competition in their DNA binding, we monitored the mobility of retinoic acid receptor (RAR) and vitamin D receptor (VDR) in live cells by fluorescence correlation spectroscopy. First, specific agonist treatment and RXR coexpression additively increased RAR DNA binding, while both agonist and RXR were required for increased VDR DNA binding, indicating weaker DNA binding of the VDR/RXR dimer. Second, coexpression of RAR, VDR, and RXR resulted in competition for DNA binding. Without ligand, VDR reduced the DNA-bound fraction of RAR and vice versa, i.e., a fraction of RXR molecules was occupied by the competing partner. The DNA-bound fraction of either RAR or VDR was enhanced by its own and diminished by the competing NR`s agonist. When treated with both ligands, the DNA-bound fraction of RAR increased as much as due to its own agonist, whereas that of VDR increased less. RXR agonist also increased DNA binding of RAR at the expense of VDR. In summary, competition between RAR and VDR for RXR is also manifested in their DNA binding in an agonist-dependent manner: RAR dominates over VDR in the absence of agonist or with both agonists present. Thus, side effects of NR-ligand-based (retinoids, thiazolidinediones) therapies may be ameliorated by other NR ligands and be at least partly explained by reduced DNA binding due to competition. Our results also complement the model of NR action by involving competition both for RXR and for DNA sites.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Journal Of Biological Chemistry. - 299 : 2 (2023), p. 1-16. -
További szerzők:	Fadel, Lina (1988-) (gyógyszerész) Brázda Péter (1980-) (biológus, angol-magyar szakfordító) Benziane, Anass (1990-) (molekuláris biológus) Hegedűs Éva (1978-) (biofizikus) Sen, Pialy Gadella, Theodorus W. Jr. Tóth Katalin (biofizikus) Nagy László (1966-) (molekuláris sejtbiológus, biokémikus) Vámosi György (1967-) (biofizikus)
Pályázati támogatás:	GINOP-2.3.2-15-2016-00026 GINOP NN129371 OTKA ANN135107 OTKA Tempus Public Foundation: Stipendium Hungaricum scholarship Egyéb German Academic Exchange Service and the Tempus Public Foundation #273478 Egyéb
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001-es BibID:	BIBFORM005097
Első szerző:	Szatmári István (biológus)
Cím:	Peroxisome proliferator-activated receptor gamma-regulated ABCG2 expression confers cytoprotection to human dendritic cells / Szatmari, I., Vamosi, G., Brazda, P., Balint, B. L., Benko, S., Szeles, L., Jeney, V., Ozvegy-Laczka, C., Szanto, A., Barta, E., Balla, J., Sarkadi, B., Nagy, L.
Dátum:	2006
ISSN:	021-9258 (Print)
Megjegyzések:	ABCG2, a member of the ATP-binding cassette transporters has been identified as a protective pump against endogenous and exogenous toxic agents. ABCG2 was shown to be expressed at high levels in stem cells and variably regulated during cell differentiation. Here we demonstrate that functional ABCG2 is expressed in human monocyte-derived dendritic cells by the activation of a nuclear hormone receptor, PPARgamma. We identified and characterized a 150-base pair long conserved enhancer region, containing three functional PPAR response elements (PPARE), upstream of the human ABCG2 gene. We confirmed the binding of the PPARgamma x RXR heterodimer to this enhancer region, suggesting that PPARgamma directly regulates the transcription of ABCG2. Consistent with these results, elevated expression of ABCG2 mRNA was coupled to enhanced protein production, resulting in increased xenobiotic extrusion capacity via ABCG2 in PPARgamma-activated cells. Furthermore PPARgamma instructed dendritic cells showed increased Hoechst dye extrusion and resistance to mitoxantrone. Collectively, these results uncovered a mechanism by which up-regulation of functional ABCG2 expression can be achieved via exogenous or endogenous activation of the lipid-activated transcription factor, PPARgamma. The increased expression of the promiscuous ABCG2 transporter can significantly modify the xenobiotic and drug resistance of human myeloid dendritic cells.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban agonists Animals antagonists & inhibitors ATP-Binding Cassette Transporters Base Sequence biosynthesis Cattle Cell Differentiation Cells cytology Cytoprotection Dendritic Cells Dogs Drug Resistance Drug Resistance,Neoplasm genetics Human Humans Hungary metabolism Mice Molecular Sequence Data Neoplasm Proteins Phenotype physiology PPAR gamma Proteins Research Support Up-Regulation Xenobiotics
Megjelenés:	The Journal of Biological Chemistry. - 281 : 33 (2006), p. 23812-23823. -
További szerzők:	Vámosi György (1967-) (biofizikus) Brázda Péter (1980-) (biológus, angol-magyar szakfordító) Bálint Bálint László (1971-) (kutató orvos) Benkő Szilvia (1973-) (molekuláris biológus) Széles Lajos (1971-) (molekuláris biológus) Jeney Viktória (1971-) (vegyész, kémia tanár) Özvegy-Laczka Csilla Szántó Attila (1976-) (orvos, biokémikus) Barta Endre (1963-) (molekuláris biológus) Balla József (1959-) (belgyógyász, nephrológus) Sarkadi Balázs Nagy László (1966-) (molekuláris sejtbiológus, biokémikus)
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