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Loading of doxorubicin into liposomes by forming Mn2+ drug complexes Cheung, Chung-Ling
Abstract
Doxorubicin has been encapsulated into liposomes with a transmembrane pH gradient. In this thesis, a new procedure for loading doxorubicin into large unilamellar vesicles (LUVs) is characterized and compared to loading using the ionophore A23187 with MnSO₄ containing liposomes. It is shown that doxorubicin can be loaded into LUVs composed of sphingomyelin/cholesterol (55/45 mole/mole) in response to a transmembrane MnSO₄ gradient in the absence of a transmembrane pH gradient. Complex formation between doxorubicin and Mn²⁺ is found to be a driving force for doxorubicin uptake. Uptake levels approaching 100 % can be achieved up to a drug-tolipid molar ratio of 0.5 utilizing an encapsulated MnSO₄ concentration of 0.30 M. In vitro leakage assays show excellent retention properties over a 24 hour period. The possible advantages of a liposomal formulation of doxorubicin loaded in response to entrapped MnSO₄ are discussed.
Item Metadata
Title |
Loading of doxorubicin into liposomes by forming Mn2+ drug complexes
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1998
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Description |
Doxorubicin has been encapsulated into liposomes with a transmembrane pH
gradient. In this thesis, a new procedure for loading doxorubicin into large unilamellar
vesicles (LUVs) is characterized and compared to loading using the ionophore A23187
with MnSO₄ containing liposomes. It is shown that doxorubicin can be loaded into LUVs
composed of sphingomyelin/cholesterol (55/45 mole/mole) in response to a
transmembrane MnSO₄ gradient in the absence of a transmembrane pH gradient.
Complex formation between doxorubicin and Mn²⁺ is found to be a driving force for
doxorubicin uptake. Uptake levels approaching 100 % can be achieved up to a drug-tolipid
molar ratio of 0.5 utilizing an encapsulated MnSO₄ concentration of 0.30 M. In vitro
leakage assays show excellent retention properties over a 24 hour period. The possible
advantages of a liposomal formulation of doxorubicin loaded in response to entrapped
MnSO₄ are discussed.
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Extent |
3157550 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-05-21
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0099306
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1998-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.