title: Aptamer-conjugated nanoparticles for the collection and detection of multiple cancer cells.
abstract: We have extended the use the aptamer-conjugated nanoparticles for the collection and detection of multiple cancer cells. The aptamers were selected using a cell-based SELEX strategy in our laboratory for cancer cells that, when utilized in this method, allow for the selective recognition of the cells from complex mixtures including fetal bovine serum samples. Aptamer-conjugated magnetic nanoparticles were used for the selective targeting cell extraction, and aptamer-conjugated fluorescent nanoparticles were employed for sensitive cellular detection. Employing both types of nanoparticles allows for selective and sensitive detection not possible by using the particles separately. Fluorescent nanoparticles amplify the signal intensity versus a single fluorophore label resulting in improved sensitivity. In addition, aptamer-conjugated magnetic nanoparticles allow for extraction and enrichment of target cells not possible with other separation methods. Fluorescent imaging and a microplate reader were used for cellular detection to demonstrate the wide applicability of this methodology for medical diagnostics and cell enrichment and separation.
authors.affiliation: Center for Research at the Bio/Nano Interface, Department of Chemistry, University of Florida, Gainesville, Florida 32611, USA.
authors.forename: Joshua E
authors.initials: JE
authors.lastname: Smith
authors.forename: Colin D
authors.initials: CD
authors.lastname: Medley
authors.forename: Zhiwen
authors.initials: Z
authors.lastname: Tang
authors.forename: Dihua
authors.initials: D
authors.lastname: Shangguan
authors.forename: Charles
authors.initials: C
authors.lastname: Lofton
authors.forename: Weihong
authors.initials: W
authors.lastname: Tan
mesh_terms: D052157:Aptamers, Nucleotide / Q000737:chemistry*; D002051:Burkitt Lymphoma / Q000235:genetics / Q000473:pathology*; D045744:Cell Line, Tumor; D005456:Fluorescent Dyes / Q000737:chemistry; D006801:Humans; D015459:Leukemia-Lymphoma, Adult T-Cell / Q000235:genetics / Q000473:pathology*; D016393:Lymphoma, B-Cell / Q000235:genetics / Q000473:pathology*; D008280:Magnetics; D053758:Nanoparticles / Q000737:chemistry*; D052156:SELEX Aptamer Technique / Q000379:methods*
chemical_list: D052157:Aptamers, Nucleotide; D005456:Fluorescent Dyes