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Quantifying the Average Number of Nucleic Acid Therapeutics per Nanocarrier by Single Particle Tracking Microscopy.

Abstract：

:Nucleic acid biopharmaceuticals are being investigated as potential therapeutics. They need to be incorporated into a biocompatible carrier so as to overcome several biological barriers. Rational development of suitable nanocarriers requires high-quality characterization techniques. While size, concentration, and stability can be very well measured these days, even in complex biological fluids, a method to accurately quantify the number of nucleic acid therapeutics encapsulated in nanocarriers is still missing. Here we present a method, based on concentration measurements with single particle tracking microscopy, with which it is possible to directly measure the number of plasmid DNA molecules per nanoparticle, referred to as the plasmid/NP ratio. Using DOTAP/DOPE liposomes as a model carrier, we demonstrate the usefulness of the method by investigating the influence of various experimental factors on the plasmid/NP ratio. We find that the plasmid/NP ratio is inversely proportional with the size of the pDNA and that the plasmid/NP decreases when lipoplexes are prepared at lower concentrations of pDNA and nanocarrier, with values ranging from 6.5 to 3 plasmid/NP. Furthermore, the effect of pre- and post-PEGylation of lipoplexes was examined, finding that pre-PEGylation results in a decreased plasmid/NP ratio, while post-PEGylation did not alter the plasmid/NP ratio. These proof-of-concept experiments show that single particle tracking offers an extension of the nanoparticle characterization toolbox and is expected to aid in the efficient development of nanoformulations for nucleic acid-based therapies.

journal_name

Mol Pharm

journal_title

Molecular pharmaceutics

authors

Zagato E,Vermeulen L,Dewitte H,Van Imschoot G,Vandenbroucke RE,Demeester J,De Smedt SC,Neyts K,Remaut K,Braeckmans K

doi

10.1021/acs.molpharmaceut.7b00999

subject

Has Abstract

pub_date

2018-03-05 00:00:00

pages

1142-1149

issue

3

eissn

1543-8384

issn

1543-8392

journal_volume

15

pub_type

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