Lipid-Coated, pH-Sensitive Magnesium Phosphate Particles for Intracellular Protein Delivery. View Full Text


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Article Info

DATE

2019-06

AUTHORS

Yunzhou Fang, Mallika Vadlamudi, Yingbo Huang, Xin Guo

ABSTRACT

PURPOSE: To develop cationic lipid-coated magnesium phosphate nanoparticles (LPP) for intracellular catalase (CAT) delivery. METHODS: Magnesium phosphate nanoparticles (MgP NP) were prepared by micro-emulsion precipitation and mixed with catalase-loaded cationic liposomes (DOTAP/cholesterol) to yield LPP formulation of catalase (LPP-CAT). The size and ζ-potential of LPP-CAT were measured by dynamic light scattering. The pH-sensitivity of LPP-CAT was determined by monitoring their degradation of hydrogen peroxide (H2O2) and their morphologies under transmission electron microscopy (TEM) at pH 7.4 and 5.5. The ability of LPP-CAT to protect MCF-7 cells against hydrogen peroxide was measured by MTS assay. ROS levels in EA.hy926 cells were measured after treatment with LPP-CAT. RESULTS: LPP-CAT were successfully prepared and carried an average diameter of <300 nm and ζ -potential of about +40 mV. At pH 5.5, LPP-CAT degraded H2O2 almost 4-fold as fast as pH 7.4 and displayed drastic morphological changes of an osmotic explosion. LPP-CAT protected MCF-7 cells from lethal level of exogenous H2O2 and significantly lowered the ROS levels in EA.hy926 cells. A lipid with a pH-sensitive conformational switch (flipid) further enhanced the protein delivery of LPP-CAT. CONCLUSION: LPP represents a promising nano-system for intracellular protein delivery. More... »

PAGES

81

Journal

TITLE

Pharmaceutical Research

ISSUE

6

VOLUME

36

Author Affiliations

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    http://scigraph.springernature.com/pub.10.1007/s11095-019-2607-6

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    http://dx.doi.org/10.1007/s11095-019-2607-6

    DIMENSIONS

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    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/30976936


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    48 schema:description PURPOSE: To develop cationic lipid-coated magnesium phosphate nanoparticles (LPP) for intracellular catalase (CAT) delivery. METHODS: Magnesium phosphate nanoparticles (MgP NP) were prepared by micro-emulsion precipitation and mixed with catalase-loaded cationic liposomes (DOTAP/cholesterol) to yield LPP formulation of catalase (LPP-CAT). The size and ζ-potential of LPP-CAT were measured by dynamic light scattering. The pH-sensitivity of LPP-CAT was determined by monitoring their degradation of hydrogen peroxide (H2O2) and their morphologies under transmission electron microscopy (TEM) at pH 7.4 and 5.5. The ability of LPP-CAT to protect MCF-7 cells against hydrogen peroxide was measured by MTS assay. ROS levels in EA.hy926 cells were measured after treatment with LPP-CAT. RESULTS: LPP-CAT were successfully prepared and carried an average diameter of <300 nm and ζ -potential of about +40 mV. At pH 5.5, LPP-CAT degraded H2O2 almost 4-fold as fast as pH 7.4 and displayed drastic morphological changes of an osmotic explosion. LPP-CAT protected MCF-7 cells from lethal level of exogenous H2O2 and significantly lowered the ROS levels in EA.hy926 cells. A lipid with a pH-sensitive conformational switch (flipid) further enhanced the protein delivery of LPP-CAT. CONCLUSION: LPP represents a promising nano-system for intracellular protein delivery.
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