title: Herceptin conjugated PLGA-PHis-PEG pH sensitive nanoparticles for targeted and controlled drug delivery.
abstract: A dual functional nano-scaled drug carrier, comprising of a targeting ligand and pH sensitivity, has been made in order to increase the specificity and efficacy of the drug delivery system. The nanoparticles are made of a tri-block copolymer, poly(d,l lactide-co-glycolide) (PLGA)-b-poly(l-histidine) (PHis)-b-polyethylene glycol (PEG), via nano-precipitation. To provide the nanoparticle feature of endolysosomal escape and pH sensitivity, poly(l-histidine) was chosen as a proton sponge polymer. Herceptin, which specifically binds to HER2 antigen, was conjugated to the nanoparticles through click chemistry. The nanoparticles were characterized via dynamic light scattering (DLS) and transmission electron microscopy (TEM). Both methods showed the sizes of about 100nm with a uniform size distribution. The pH sensitivity was assessed by drug releases and size changes at different pH conditions. As pH decreased from 7.4 to 5.2, the drug release rate accelerated and the size significantly increased. During in vitro tests against human breast cancer cell lines, MCF-7 and SK-BR-3 showed significantly increased uptake for Herceptin-conjugated nanoparticles, as compared to non-targeted nanoparticles. Herceptin-conjugated pH-sensitive nanoparticles showed the highest therapeutic effect, and thus validated the efficacy of a combined approach of pH sensitivity and active targeting.
authors: Chemical Engineering Program, Department of Biomedical, Environmental, and Chemical Engineering, University of Cincinnati, Cincinnati, OH 45221-0012, USA.
authors: Zilan
authors: Z
authors: Zhou
authors: Chemical Engineering Program, Department of Biomedical, Environmental, and Chemical Engineering, University of Cincinnati, Cincinnati, OH 45221-0012, USA.
authors: Apurva
authors: A
authors: Badkas
authors: Department of Environmental Health, College of Medicine, University of Cincinnati, Cincinnati, OH 45221-0012, USA.
authors: Max
authors: M
authors: Stevenson
authors: Chemical Engineering Program, Department of Biomedical, Environmental, and Chemical Engineering, University of Cincinnati, Cincinnati, OH 45221-0012, USA. Electronic address: joo.lee@uc.edu.
authors: Joo-Youp
authors: JY
authors: Lee
authors: Department of Environmental Health, College of Medicine, University of Cincinnati, Cincinnati, OH 45221-0012, USA.
authors: Yuet-Kin
authors: YK
authors: Leung
mesh_terms: D000970:Antineoplastic Agents / Q000008:administration & dosage* / Q000737:chemistry*; D045744:Cell Line, Tumor; D002626:Chemistry, Pharmaceutical; D004337:Drug Carriers; D016503:Drug Delivery Systems; D005260:Female; D006639:Histidine; D006801:Humans; D019344:Lactic Acid; D008247:Lysosomes / Q000378:metabolism; D053758:Nanoparticles; D010316:Particle Size; D011092:Polyethylene Glycols; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000378:metabolism; D000068878:Trastuzumab / Q000008:administration & dosage* / Q000737:chemistry*
chemical_list: D000970:Antineoplastic Agents; D004337:Drug Carriers; D006639:Histidine; D019344:Lactic Acid; D011092:Polyethylene Glycols; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D018719:Erb-b2 Receptor Tyrosine Kinases; D000068878:Trastuzumab; C033223:polyhistidine; C508053:ERBB2 protein, human
keywords: Active targeting; Breast cancer; Herceptin(®); Polymeric nanoparticles; pH sensitivity