Engineering of Recombinant Spider Silk Proteins Allows Defined Uptake and Release of Substances

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Doblhofer, Elena ; Scheibel, Thomas:
Engineering of Recombinant Spider Silk Proteins Allows Defined Uptake and Release of Substances.
In: Journal of Pharmaceutical Sciences. Bd. 104 (2015) Heft 3 . - S. 988-994.
ISSN 0022-3549
DOI: https://doi.org/10.1002/jps.24300

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Abstract

Drug delivery carriers stabilize drugs and control their release, expanding the therapeutic window, and avoiding side effects of otherwise freely diffusing drugs in the human body. Materials used as carrier vehicles have to be biocompatible, biodegradable, nontoxic, and nonimmunogenic. Previously, particles made of the recombinant spider silk protein eADF4(C16) could be effectively loaded
with positively and neutrally charged model substances. Here, a new positively charged variant thereof, named eADF4(κ16), has been engineered. Its particle formation is indistinguishable to that of polyanionic eADF4(C16), but in contrast polycationic eADF4(κ16) allows incorporation of negatively charged substances. Both high-molecular-weight substances, such as nucleic acids, and low-molecular-weight
substances could be efficiently loaded onto eADF4(κ16) particles, and release of nucleic acids was shown to be well controlled. © 2014
Wiley Periodicals, Inc. and the American Pharmacists Association J Pharm Sci 104:988–994, 2015