Abstract
Microbubbles (MBs) have specific acoustic properties that make them useful as contrast agents in ultrasound imaging. The use of the MBs in clinical practice led to the development of more sensitive imaging techniques both in cardiology and radiology. Protein-MBs are typically obtained by dispersing a gas phase in the protein solution and the protein deposited/cross-linked on the gas–liquid interface stabilizes the gas core. Innovative applications of protein-MBs prompt the investigation on the properties of MBs obtained using different proteins that are able to confer them specific properties and functionality. Recently, we have synthesized stable air-filled lysozyme-MBs (LysMBs) using high-intensity ultrasound-induced emulsification of a partly reduced lysozyme in aqueous solutions. The stability of LysMBs suspension allows for post-synthetic modification of MBs surface. In the present work, the protein folded state and the biodegradability property of LysMBs were investigated by limited proteolysis. Moreover, LysMBs were coated and functionalized with a number of biomacromolecules (proteins, polysaccharides, nucleic acids). Remarkably, LysMBs show a high DNA-binding ability and protective effects of the nucleic acids from nucleases and, further, the ability to transform the bacteria cells. These results highlight on the possibility of using LysMBs for delivery of proteins and nucleic acids in prophylactic and therapeutic applications.
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Abbreviations
- BSA:
-
Bovine serum albumin
- DNase I:
-
Deoxyribonuclease I
- DTT:
-
Dithiothreitol
- EtBr:
-
Ethidium bromide
- FITC:
-
Fluorescein isothiocyanate
- IPTG:
-
Isopropyl-β-d-thiogalactoside
- Lf:
-
Lactoferrin
- MBs:
-
Microbubbles
- OD:
-
Oxidation degree
- pWWf :
-
pQE30-wwf
- RP-HPLC:
-
Reversed-phase chromatography
- SDS-PAGE:
-
Sodium dodecyl sulphate-polyacrylamide gel electrophoresis
- SEM:
-
Scanning electron microscopy
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This work has been supported by FP7-PEOPLE-IRSES-2008 grant.
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Melino, S., Zhou, M., Tortora, M. et al. Molecular properties of lysozyme-microbubbles: towards the protein and nucleic acid delivery. Amino Acids 43, 885–896 (2012). https://doi.org/10.1007/s00726-011-1148-z
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DOI: https://doi.org/10.1007/s00726-011-1148-z