Understanding biophysical behaviours of microfluidic-synthesized nanoparticles at nano-biointerface.
Encapsulating drugs in nanoparticles (NPs) provide some advantages over free drugs; for example the probability of distribution in off-target tissues decreases and drugs remain safe from environment degrading factors. Upon entering the bioenvironment, NPs establish a number of interactions with their surroundings based on their physicochemical properties. Here we demonstrate how the size-surface charge interplay of chitosan NPs affects the protein corona formation and endocytosis pathway in the HeLa cells at non-toxic concentrations. Generally, large NPs (102 and 161nm) with low surface charge (+6.7 and +3.6mV) exhibited weaker tendency for endocytosis compared with smaller ones (63 and 83nm with 10 and 9.3mV surface charge, respectively). This is mainly because the interactions of larger NPs with the plasma membrane were too weak to release enough free energy required for cellular internalization. Furthermore, we tested the upright and inverted cell culture configurations to better understand the impact of the sedimentation and diffusion velocities of NPs on the resulting cellular uptake pattern in both serum free and serum containing culture medias. Considering the different particokinetics, the amount of internalized NPs in upright and inverted positions differed in all cases by a factor of approximately three (for 161nm particles), or less for smaller ones. Ultimately, our results offer a paradigm for analyzing the biobehavior of NPs under the precise control of their physicochemical characteristics.
Department of Biomedical Engineering, University of Calgary, Calgary, Alberta, Canada.
Shirin
S
Soleimani
Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA, USA; G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, USA. Electronic address: mahdi.hasani@gatech.edu.
Mohammad Mahdi
MM
Hasani-Sadrabadi
Department of Bioengineering, University of California at Los Angeles, Los Angeles, CA, USA.
Fatemeh Sadat
FS
Majedi
Department of Developmental Sciences, Marquette University School of Dentistry, Milwaukee, WI, USA.
Erfan
E
Dashtimoghadam
Department of Biochemistry and Molecular & Cellular Biology, Georgetown University, Washington DC, USA.
Mahdi
M
Tondar
Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA, USA; G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, USA; School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, USA. Electronic address: karl.jacob@mse.gatech.edu.
Karl I
KI
Jacob
D001703:Biophysics; D048271:Chitosan / Q000737:chemistry; D004705:Endocytosis; D006367:HeLa Cells; D006801:Humans; D044085:Microfluidics / Q000379:methods*; D053758:Nanoparticles / Q000737:chemistry*; D013499:Surface Properties
D048271:Chitosan
Chitosan nanoparticles; Endocytosis; Nano-biointerface; Physicochemical properties; Protein Corona