Biomaterials, Biodegradables and Biomimetics Research Group

Papers in Scientific Journals

Liposomes embedded in layer by layer constructs as simplistic extracellular vesicles transfer model

Abstract

Extracellular vesicles (EVs) are particles originating from the exfoliation of the cellular membrane. They are involved in cell-to-cell and cell-to-matrix signaling, exchange of bioactive molecules, tumorigenesis and metastasis, among others. To mitigate the limited understanding of EVs transfer phenomena, we developed a simplistic model that mimics EVs and their interactions with cells and the extracellular matrix. The proposed model is a layer-by-layer (LbL) film built from the polycationic poly-L-lysine (PLL) and the glycosaminoglycan hyaluronic acid (HA) to provide ECM mimicry. Positively charged 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) and N1,N1,N14,N14-tetramethyl-N1,N14-ditetradecyltetradecane-1,14-diaminium dibromide (GS14) liposomes were embedded in this construct to act as EVs analogs. To simulate EVs carrying substances, Nile Red was loaded as a model of lipophilic cargo molecules. The integration of each component was followed by quartz-crystal microbalance measurements, which confirmed the immobilization of intact liposomes on the underlying (PLL/HA)3 soft film. The release of Nile Red from liposomes either embedded in the LbL construct or exposed at its surface revealed a fast first order release. This system was validated as a model for EV/cell interactions by incubation with breast cancer cells MDA-MB-231. We observed higher internalization for embedded liposomes when compared with surface-exposed ones, showcasing that the ECM mimic layers do not constitute a barrier to liposome/cell interactions but favor them.

Journal
Materials Science and Engineering C
Volume
121
Pagination
111813
Publisher
Elsevier
ISSN
0928-4931
URL
https://www.sciencedirect.com/science/article/pii/S0928493120337322
Keywords
cell communication, Extracellular matrix, Glycosaminoglycans, layer-by-layer, Liposomes, Supported vesicle layers
Rights
Restricted Access
Peer Reviewed
Yes
Status
published
Project
CardioHeal
Year of Publication
2021
DOI
10.1016/j.msec.2020.111813
Date Published
2021-01-13
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