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Université de Fribourg

Cellular shuttles: monocytes/macrophages exhibit transendothelial transport of nanoparticles under physiological flow

Moore, Thomas L. ; Hauser, Daniel ; Gruber, Thomas ; Rothen-Rutishauser, Barbara ; Lattuada, Marco ; Petri-Fink, Alke ; Lyck, Ruth

In: ACS Applied Materials & Interfaces, 2017, vol. 9, no. 22, p. 18501–18511

A major hurdle in the development of biomedical nanoparticles (NP) is understanding how they interact with complex biological systems and navigate biological barriers to arrive at pathological targets. It is becoming increasingly evident that merely controlling particle physicochemical properties may not be sufficient to mediate particle biodistribution in dynamic environments. Thus,...

Université de Fribourg

Quantifying nanoparticle cellular uptake: which method is best?

Drasler, Barbara ; Vanhecke, Dimitri ; Rodriguez-Lorenzo, Laura ; Petri-Fink, Alke ; Rothen-Rutishauser, Barbara

In: Nanomedicine, 2017, vol. 12, no. 10, p. 1095–1099

As the range of engineered nanoparticles (NPs) designed as specific carriers increases, for example for cell targeting and drug delivery, the question on how many NPs are interacting or are taken up by cells is becoming increasingly important for any potential biomedical application. On one hand, the delivered dose of such NPs to the targeted cells is a key parameter in the assessment of...

Université de Fribourg

Human asthmatic bronchial cells are more susceptible to subchronic repeated exposures of aerosolized carbon nanotubes at occupationally relevant doses than healthy cells

Chortarea, Savvina ; Barosova, Hana ; Clift, Martin James David ; Wick, Peter ; Petri-Fink, Alke ; Rothen-Rutishauser, Barbara

In: ACS Nano, 2017, p. -

Although acute pulmonary toxicity of carbon nanotubes (CNTs) has been extensively investigated, the knowledge of potential health effects following chronic occupational exposure is currently limited and based only upon in vivo approaches. Our aim was to realistically mimic subchronic inhalation of multiwalled CNTs (MWCNTs) in vitro, using the air–liquid interface cell exposure (ALICE)...

Université de Fribourg

Dynamic and biocompatible thermo-responsive magnetic hydrogels that respond to an alternating magnetic field

Crippa, Federica ; Moore, Thomas L. ; Mortato, Mariangela ; Geers, Christoph ; Haeni, Laetitia ; Hirt, Ann M. ; Rothen-Rutishauser, Barbara ; Petri-Fink, Alke

In: Journal of Magnetism and Magnetic Materials, 2017, vol. 427, p. 212–219

Magnetic thermo-responsive hydrogels are a new class of materials that have recently attracted interest in biomedicine due to their ability to change phase upon magnetic stimulation. They have been used for drug release, magnetic hyperthermia treatment, and can potentially be engineered as stimuli-responsive substrates for cell mechanobiology. In this regard, we propose a series of magnetic...

Université de Fribourg

A novel technique to determine the cell type specific response within an in vitro co-culture model via multi-colour flow cytometry

Clift, Martin J. D. ; Fytianos, Kleanthis ; Vanhecke, Dimitri ; Hočevar, Sandra ; Petri-Fink, Alke ; Rothen-Rutishauser, Barbara

In: Scientific Reports, 2017, vol. 7, no. 1, p. 434

Determination of the cell type specific response is essential towards understanding the cellular mechanisms associated with disease states as well as assessing cell-based targeting of effective therapeutic agents. Recently, there have been increased calls for advanced in vitro multi-cellular models that provide reliable and valuable tools correlative to in vivo. In this pursuit the ability to...

Université de Fribourg

Lock-in thermography as a rapid and reproducible thermal characterization method for magnetic nanoparticles

Lemal, Philipp ; Geers, Christoph ; Monnier, Christophe A. ; Crippa, Federica ; Daum, Leopold ; Urban, Dominic A. ; Rothen-Rutishauser, Barbara ; Bonmarin, Mathias ; Petri-Fink, Alke

In: Journal of Magnetism and Magnetic Materials, 2017, vol. 427, p. 206–211

Lock-in thermography (LIT) is a sensitive imaging technique generally used in engineering and materials science (e.g. detecting defects in composite materials). However, it has recently been expanded for investigating the heating power of nanomaterials, such as superparamagnetic iron oxide nanoparticles (SPIONs). Here we implement LIT as a rapid and reproducible method that can evaluate the...

Université de Fribourg

Interaction of biomedical nanoparticles with the pulmonary immune system

Blank, Fabian ; Fytianos, Kleanthis ; Seydoux, Emilie ; Rodriguez-Lorenzo, Laura ; Petri-Fink, Alke ; Garnier, Christophe von ; Rothen-Rutishauser, Barbara

In: Journal of Nanobiotechnology, 2017, vol. 15, p. 6

Engineered nanoparticles (NPs) offer site-specific delivery, deposition and cellular uptake due to their unique physicochemical properties and were shown to modulate immune responses. The respiratory tract with its vast surface area is an attractive target organ for innovative immunomodulatory therapeutic applications by pulmonary administration of such NPs, enabling interactions with...

Université de Fribourg

Assumption-free morphological quantification of single anisotropic nanoparticles and aggregates

Vanhecke, Dimitri ; Rodríguez-Lorenzo, Laura ; Kinnear, Calum ; Durantie, Estelle ; Rothen-Rutishauser, Barbara ; Petri-Finka, Alke

In: Nanoscale, 2017, vol. 9, no. 15, p. 4918–4927

Characterizing the morphometric parameters of noble metal nanoparticles for sensing and catalysis is a persistent challenge due to their small size and complex shape. Herein, we present an approach to determine the volume, surface area, and curvature of non-symmetric anisotropic nanoparticles using electron tomography and design- based stereology without the use of segmentation tools or...