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Authors = Katalin Réti-Nagy

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15 pages, 2616 KiB  
Article
Effects of Hydroxypropyl-Beta-Cyclodextrin on Cultured Brain Endothelial Cells
by Szilvia Veszelka, Mária Mészáros, Gergő Porkoláb, Ágnes Rusznyák, Katalin Szászné Réti-Nagy, Mária A. Deli, Miklós Vecsernyés, Ildikó Bácskay, Judit Váradi and Ferenc Fenyvesi
Molecules 2022, 27(22), 7738; https://doi.org/10.3390/molecules27227738 - 10 Nov 2022
Cited by 2 | Viewed by 3052
Abstract
The application of 2-hydroxypropyl-beta-cyclodextrin (HPBCD) in the treatment of the rare cholesterol and lipid storage disorder Niemann–Pick disease type C opened new perspectives in the development of an efficient therapy. Even if the systemic administration of HPBCD was found to be effective, its [...] Read more.
The application of 2-hydroxypropyl-beta-cyclodextrin (HPBCD) in the treatment of the rare cholesterol and lipid storage disorder Niemann–Pick disease type C opened new perspectives in the development of an efficient therapy. Even if the systemic administration of HPBCD was found to be effective, its low permeability across the blood–brain barrier (BBB) limited the positive neurological effects. Nevertheless, the cellular interactions of HPBCD with brain capillary endothelial cells have not been investigated in detail. In this study, the cytotoxicity, permeability, and cellular internalization of HPBCD on primary rat and immortalized human (hCMEC/D3) brain capillary endothelial cells were investigated. HPBCD shows no cytotoxicity on endothelial cells up to 100 µM, measured by impedance kinetics. Using a fluorescent derivative of HPBCD (FITC-HPBCD) the permeability measurements reveal that on an in vitro triple co-culture BBB model, FITC-HPBCD has low permeability, 0.50 × 10−6 cm/s, while on hCMEC/D3 cell layers, the permeability is higher, 1.86 × 10−5 cm/s. FITC-HPBCD enters brain capillary endothelial cells, is detected in cytoplasmic vesicles and rarely localized in lysosomes. The cellular internalization of HPBCD at the BBB can help to develop new strategies for improved HPBCD effects after systemic administration. Full article
(This article belongs to the Special Issue Molecular Encapsulation)
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12 pages, 2085 KiB  
Article
Cellular Effects of Cyclodextrins: Studies on HeLa Cells
by Ágnes Rusznyák, Mercédesz Palicskó, Milo Malanga, Éva Fenyvesi, Lajos Szente, Judit Váradi, Ildikó Bácskay, Miklós Vecsernyés, Katalin Szászné Réti-Nagy, Gábor Vasvári, Ádám Haimhoffer and Ferenc Fenyvesi
Molecules 2022, 27(5), 1589; https://doi.org/10.3390/molecules27051589 - 28 Feb 2022
Cited by 8 | Viewed by 3959
Abstract
Cyclodextrins are high molecular weight, hydrophilic, cyclic, non-reducing oligosaccharides, applied as excipients for the improvement of the solubility and permeability of insoluble active pharmaceutical ingredients. On the other hand, beta-cyclodextrins are used as cholesterol sequestering agents in life sciences. Recently, we demonstrated the [...] Read more.
Cyclodextrins are high molecular weight, hydrophilic, cyclic, non-reducing oligosaccharides, applied as excipients for the improvement of the solubility and permeability of insoluble active pharmaceutical ingredients. On the other hand, beta-cyclodextrins are used as cholesterol sequestering agents in life sciences. Recently, we demonstrated the cellular internalization and intracellular effects of cyclodextrins on Caco-2 cells. In this study, we aimed to further investigate the endocytosis of (2-hydroxylpropyl)-beta-(HPBCD) and random methylated-beta-cyclodextrin (RAMEB) to test their cytotoxicity, NF-kappa B pathway induction, autophagy, and lysosome formation on HeLa cells. These derivatives were able to enter the cells; however, major differences were revealed in the inhibition of their endocytosis compared to Caco-2 cells. NF-kappa B p65 translocation was not detected in the cell nuclei after HPBCD or RAMEB pre-treatment and cyclodextrin treatment did not enhance the formation of autophagosomes. These cyclodextrin derivates were partially localized in lysosomes after internalization. Full article
(This article belongs to the Special Issue Cyclodextrin Chemistry and Toxicology II)
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21 pages, 3146 KiB  
Review
Cyclodextrins in Drug Delivery Systems and Their Effects on Biological Barriers
by Ádám Haimhoffer, Ágnes Rusznyák, Katalin Réti-Nagy, Gábor Vasvári, Judit Váradi, Miklós Vecsernyés, Ildikó Bácskay, Pálma Fehér, Zoltán Ujhelyi and Ferenc Fenyvesi
Sci. Pharm. 2019, 87(4), 33; https://doi.org/10.3390/scipharm87040033 - 20 Nov 2019
Cited by 137 | Viewed by 16033
Abstract
Cyclodextrins are widely used excipients, composed of glucopyranose units with a cyclic structure. One of their most important properties, is that their inner cavity is hydrophobic, while their surface is hydrophilic. This enables them for the complex formation with lipophilic molecules. They have [...] Read more.
Cyclodextrins are widely used excipients, composed of glucopyranose units with a cyclic structure. One of their most important properties, is that their inner cavity is hydrophobic, while their surface is hydrophilic. This enables them for the complex formation with lipophilic molecules. They have several applications in the pharmaceutical field like solubility enhancers or the building blocks of larger drug delivery systems. On the other hand, they have numerous effects on cells or biological barriers. In this review the most important properties of cyclodextrins and cyclodextrin-based drug delivery systems are summarized with special focus on their biological activity. Full article
(This article belongs to the Special Issue New Insights into Drug Delivery and Absorption)
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