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Controlled release and targeting of polypeptide-deposited liposomes by enzymatic degradation

Polymer Journal volume 51, pages 1223–1230 (2019)Cite this article

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Abstract

We prepared biobased nanocapsules with enzymatic degradability, which were generated by the layer-by-layer deposition of enzymes and polypeptide over the liposomal surface. Here, we demonstrate two different systems based on the enzymatic degradation of polymer layers. First, the deposition of trypsin and polyarginine (PArg), which is cleavable by trypsin, was carried out over a negatively charged liposome. The enzymatic cleavage of PArg resulted in exposure of the lipid membrane, which facilitated release of the cargo. Next, we attempted to degrade the outer polymer layer of the multilayered capsule wall to display the inner polymer layer by enzymatic degradation. This approach enabled the accumulation and targeting of the nanocapsules through the affinity between the displayed polymer layer and the target hydroxyapatite (HAp). The polymer wall was constructed with an inner layer consisting of poly-L-glutamic acid (PGlu) and an outer layer consisting of trypsin and PArg onto the liposome. The degradation of the outer PArg by trypsin allowed the surface to display the inner PGlu, which has bone-targeting ability. In addition, the polymer wall was constructed from an inner layer of PArg and an outer layer of pepsin and PGlu. The degradation of the outer PGlu by pepsin led to inner PArg on the surface to achieve cell-penetrating activity.

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Authors and Affiliations

  1. The Center for Chemical Biology, School of Fundamental Science and Technology, Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan

    Yuuka Fukui, Hikari Otsuka & Keiji Fujimoto

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  1. Yuuka Fukui
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  2. Hikari Otsuka
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  3. Keiji Fujimoto
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Correspondence to Keiji Fujimoto.

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Fukui, Y., Otsuka, H. & Fujimoto, K. Controlled release and targeting of polypeptide-deposited liposomes by enzymatic degradation. Polym J 51, 1223–1230 (2019). https://doi.org/10.1038/s41428-019-0232-1

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