Novel electrospun chitosan/PEO membranes for more predictive nanoparticle transport studies at biological barriers

The design of safe and effective nanoparticles (NPs) for commercial and medical applications requires a profound understanding of NP translocation and effects at biological barriers. To gain mechanistic insights, physiologically relevant and accurate human in vitro biobarrier models are indispensable. However, current transfer models largely rely on artificial porous polymer membranes for the cultivation of cells, which do not provide a close mimic of the natural basal membrane and intrinsically provide limited permeability for NPs. In this study, electrospinning is exploited to develop thin chitosan/polyethylene oxide (PEO) membranes with a high porosity and nanofibrous morphology for more predictive NP transfer studies. The nanofiber membranes allow the cultivation of a tight and functional placental monolayer (BeWo trophoblasts). Translocation studies with differently sized molecules and NPs (Na-fluorescein; 40 kDa FITC-Dextran; 25 nm PMMA; 70, 180 and 520 nm polystyrene NPs) across empty and cell containing membranes reveal a considerably enhanced permeability compared to commercial microporous membranes. Importantly, the transfer data of NPs is highly similar to data from ex vivo perfusion studies of intact human placental tissue. Therefore, the newly developed membranes may decisively contribute to establish physiologically relevant in vitro biobarrier transfer models with superior permeability for a wide range of molecules and particles.

Automated summary

The design of safe and effective nanoparticles for commercial and medical applications requires a thorough understanding of their translocation and effects in biological barriers. In this study, thin chitosan/polyethylene oxide membranes with a high porosity and nanofibrous morphology were developed using electrospinning, allowing for the cultivation of a functional placental monolayer. The transfer studies using these membranes showed significantly enhanced permeability compared to commercial microporous membranes, and the transfer data of nanoparticles was highly similar to ex vivo perfusion studies of intact human placental tissue. These newly developed membranes could contribute to establishing physiologically relevant in vitro biobarrier transfer models with superior permeability for a wide range of molecules and particles.