title: Targeted Treatment of Metastatic Breast Cancer by PLK1 siRNA Delivered by an Antioxidant Nanoparticle Platform.
abstract: Metastatic breast cancer is developed in about 20% to 30% of newly diagnosed patients with early-stage breast cancer despite treatments. Herein, we report a novel nanoparticle platform with intrinsic antimetastatic properties for the targeted delivery of Polo-like kinase 1 siRNA (siPLK1). We first evaluated it in a triple-negative breast cancer (TNBC) model, which shows high metastatic potential. PLK1 was identified as the top therapeutic target for TNBC cells and tumor-initiating cells in a kinome-wide screen. The platform consists of a 50-nm mesoporous silica nanoparticle (MSNP) core coated layer-by-layer with bioreducible cross-linked PEI and PEG polymers, conjugated with an antibody for selective uptake into cancer cells. siRNA is loaded last and fully protected under the PEG layer from blood enzymatic degradation. The material has net neutral charge and low nonspecific cytotoxicity. We have also shown for the first time that the MSNP itself inhibited cancer migration and invasion in TNBC cells owing to its ROS- and NOX4-modulating properties.In vivo, siPLK1 nanoconstructs (six doses of 0.5 mg/kg) knocked down about 80% of humanPLK1mRNA expression in metastatic breast cancer cells residing in mouse lungs and reduced tumor incidence and burden in lungs and other organs of an experimental metastasis mouse model. Long-term treatment significantly delayed the onset of death in mice and improved the overall survival. The platform capable of simultaneously inhibiting the proliferative and metastatic hallmarks of cancer progression is unique and has great therapeutic potential to also target other metastatic cancers beyond TNBC.Mol Cancer Ther; 16(4); 763-72. ©2017 AACR.
authors.affiliation: Department of Biomedical Engineering, Oregon Health and Science University, Portland, Oregon.
authors.forename: Jingga
authors.initials: J
authors.lastname: Morry
authors.affiliation: Department of Biomedical Engineering, Oregon Health and Science University, Portland, Oregon.|PDX Pharmaceuticals, LLC, Portland, Oregon.
authors.forename: Worapol
authors.initials: W
authors.lastname: Ngamcherdtrakul
authors.affiliation: Department of Biomedical Engineering, Oregon Health and Science University, Portland, Oregon.
authors.forename: Shenda
authors.initials: S
authors.lastname: Gu
authors.affiliation: Department of Biomedical Engineering, Oregon Health and Science University, Portland, Oregon.
authors.forename: Moataz
authors.initials: M
authors.lastname: Reda
authors.affiliation: Department of Biomedical Engineering, Oregon Health and Science University, Portland, Oregon.|PDX Pharmaceuticals, LLC, Portland, Oregon.
authors.forename: David J
authors.initials: DJ
authors.lastname: Castro
authors.affiliation: Department of Biomedical Engineering, Oregon Health and Science University, Portland, Oregon.
authors.forename: Thanapon
authors.initials: T
authors.lastname: Sangvanich
authors.affiliation: Department of Biomedical Engineering, Oregon Health and Science University, Portland, Oregon. grayjo@ohsu.edu yantasee@ohsu.edu.
authors.forename: Joe W
authors.initials: JW
authors.lastname: Gray
authors.affiliation: Department of Biomedical Engineering, Oregon Health and Science University, Portland, Oregon. grayjo@ohsu.edu yantasee@ohsu.edu.|PDX Pharmaceuticals, LLC, Portland, Oregon.
authors.forename: Wassana
authors.initials: W
authors.lastname: Yantasee
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000008:administration & dosage* / Q000494:pharmacology; D018797:Cell Cycle Proteins / Q000037:antagonists & inhibitors / Q000235:genetics*; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000187:drug effects; D049109:Cell Proliferation; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D051379:Mice; D053758:Nanoparticles / Q000008:administration & dosage*; D009362:Neoplasm Metastasis; D014411:Neoplastic Stem Cells / Q000187:drug effects* / Q000378:metabolism; D017346:Protein Serine-Threonine Kinases / Q000037:antagonists & inhibitors / Q000235:genetics*; D011518:Proto-Oncogene Proteins / Q000037:antagonists & inhibitors / Q000235:genetics*; D034741:RNA, Small Interfering / Q000008:administration & dosage*; D064726:Triple Negative Breast Neoplasms / Q000235:genetics / Q000628:therapy*; D023041:Xenograft Model Antitumor Assays; D000097869:Polo-Like Kinase 1
chemical_list: D000975:Antioxidants; D018797:Cell Cycle Proteins; D017346:Protein Serine-Threonine Kinases; D011518:Proto-Oncogene Proteins; D034741:RNA, Small Interfering; D000097869:Polo-Like Kinase 1