title: Characterization and cell material interactions of PEGylated PNIPAAM nanoparticles.
abstract: The aim of this study was to investigate the haemocompatibility of poly(N-isopropylacrylamide)-co-poly(ethylene glycol), PNIPAAM-PEG based nanoparticles and the influence of poly(ethylene glycol), PEG on the interactions of nanoparticles with cells. To achieve this purpose, thermosensitive PNIPAAM-PEG nanoparticles were synthesized by free radical dispersion polymerization method. Optimized nanosystems had particle sizes less than 200 nm, low polydispersity and LCST of 40-41 degrees C. The nanoparticles also showed nearly 83% encapsulation efficiency for doxorubicin HCl with temperature dependent release. Presence of PEG resulted in reduced protein adsorption by more than 50% in comparison to non-PEG containing nanoparticles. Protein adsorption was noted to be dependent on PEG chain length and was the least with M(n)=4000. The particles up to a concentration of 2mg/ml did not show any toxicity on J774 and L929 cell lines. No interactions were observed when NIPAAM-PEG nanoparticles were incubated with blood cells viz. RBCs, neutrophils, platelets and the coagulation system suggesting their haemocompatibility.
authors.affiliation: Centre for Biomedical Engineering, Indian Institute of Technology, Hauz Khas, New Delhi, India.
authors.forename: Nany
authors.initials: N
authors.lastname: Gulati
authors.forename: Rachna
authors.initials: R
authors.lastname: Rastogi
authors.forename: Amit K
authors.initials: AK
authors.lastname: Dinda
authors.forename: Renu
authors.initials: R
authors.lastname: Saxena
authors.forename: Veena
authors.initials: V
authors.lastname: Koul
mesh_terms: D000178:Acrylamides / Q000737:chemistry*; D000180:Acrylic Resins; D000818:Animals; D001777:Blood Coagulation / Q000187:drug effects; D001792:Blood Platelets / Q000166:cytology / Q000187:drug effects; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D004912:Erythrocytes / Q000187:drug effects; D006461:Hemolysis / Q000187:drug effects; D006801:Humans; D007739:L Cells; D051379:Mice; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000008:administration & dosage / Q000737:chemistry* / Q000648:ultrastructure; D009504:Neutrophils / Q000166:cytology / Q000187:drug effects; D010314:Partial Thromboplastin Time; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011517:Prothrombin Time; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature
chemical_list: D000178:Acrylamides; D000180:Acrylic Resins; D011108:Polymers; C052970:poly-N-isopropylacrylamide; D011092:Polyethylene Glycols