Nanogel scavengers for drugs: local anesthetic uptake by thermoresponsive nanogels. Acta Biomater 2012 Apr;8(4):1450-8
Date
01/17/2012Pubmed ID
22244983Pubmed Central ID
PMC3289739DOI
10.1016/j.actbio.2011.12.028Scopus ID
2-s2.0-84857781615 (requires institutional sign-in at Scopus site) 31 CitationsAbstract
The use of functional nanogels based on poly(N-isopropylacrylamide) for effectively scavenging compounds (here, the model drug bupivacaine) is demonstrated using an in vitro cell-based assay. Nanogels containing higher loadings of acidic functional groups or more core-localized functional group distributions bound more bupivacaine, while nanogel size had no significant effect on drug binding. Increasing the dose of nanogel applied also facilitated more bupivacaine binding for all nanogel compositions tested. Binding was driven predominantly by acid-base interactions between the nanogels (anionic) and bupivacaine (cationic) at physiological pH, although both non-specific absorption and hydrophobic partitioning also contributed to drug scavenging. Nanogels exhibited minimal cytotoxicity to multiple cell types and were well tolerated in vivo via peritoneal injections, although larger nanogels caused limited splenic toxicity at higher concentrations. The cell-based assay described herein is found to facilitate more robust drug uptake measurements for nanogels than conventional centrifugation-based assays, in which nanogels can be compressed (and thus drug released) during the measurement.
Author List
Hoare T, Sivakumaran D, Stefanescu CF, Lawlor MW, Kohane DSAuthor
Michael W. Lawlor MD, PhD Adjunct Professor in the Pathology department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
Anesthetics, LocalAnimals
Biocompatible Materials
Bupivacaine
Cell Death
Cell Line
Cell Survival
Electrophoresis
Humans
Materials Testing
Mice
Muscle Fibers, Skeletal
Particle Size
Polyethylene Glycols
Polyethyleneimine
Temperature
