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001-es BibID:BIBFORM019815
Első szerző:Eckhardt, Erik R. M.
Cím:High density lipoprotein endocytosis by scavenger receptor SR-BII is clathrin-dependent and requires a carboxyl-terminal dileucine motif / Erik R. M. Eckhardt, Lei Cai, Shoba Shetty, Zhenze Zhao, Attila Szanto, Nancy R. Webb, Deneys R. Van der Westhuyzen
Dátum:2006
ISSN:0021-9258
Megjegyzések:The high density lipoprotein (HDL) receptor Scavenger Receptor BII (SR-BII) is encoded by an alternatively spliced mRNA from the SR-BI gene and is expressed in various tissues. SR-BII protein differs from SR-BI only in the carboxyl-terminal cytoplasmic tail, which, as we showed previously, must contain a signal that confers predominant intracellular expression and rapid endocytosis of HDL. We have shown that SR-BII mediates HDL endocytosis through aclathrin-dependent, caveolae-independent pathway. Two candidate amino acid motifs were identified in the tail that could mediate association with clathrin-containing endocytic vesicles: a putative dileucine motif at position 492-493 and an overlapping tyrosine-based YXXZ motif starting at position 489. Although substitution of tyrosine at position 489 with alanine or histidine did not affect endocytosis, substitution L492A resulted in increased surface binding of HDL and reduced HDL particle endocytosis. Substitution L493A had a less dramatic effect. No other regions in the carboxyl-terminal tail appeared to contain motifs required for HDL endocytosis. Substitutions of leucine at position 492 with the hydrophobic amino acids valine or phenylalanine also reduced HDL endocytosis, stressing the importance of leucine at this position. Introducing the SR-BII YTPLL motif into the carboxyl-terminal cytoplasmic tail of SR-BI converted SR-BI into an endocytic receptor resembling SR-BII. These results demonstrated that SR-BII differs from SR-BI in subcellular localization and trafficking and suggest that the two isoforms differ in the manner in which they target ligands intracellularly.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Journal Of Biological Chemistry. - 281 : 7 (2006), p. 4348-4353. -
További szerzők:Szántó Attila (1976-) (orvos, biokémikus) Cai, Lei Shetty, Shoba Zhao, Zhenze Webb, Nancy R. Westhuyzen, Deneys R. van der
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DOI
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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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