title: Combination of an aptamer probe to CD4 and antibodies for multicolored cell phenotyping.
abstract: Aptamers have emerged as a new class of small molecule ligands. These short, single-stranded oligonucleotides can be produced through simple chemical synthesis, making them easier and less costly to produce than antibodies. We synthesized an RNA aptamer probe specific for human CD4 using a reported sequence and investigated the potential use of this probe in cell phenotyping. Studies in cultured cells demonstrated that the synthetic CD4 aptamer had a nearly identical cell-binding specificity as the standard CD4 antibody. Fluorescent microscopy confirmed that the aptamer and antibody generated the same CD4 staining pattern in cells without competing with one another. Multicolored flow cytometry analysis revealed that the CD4 aptamer could be combined with antibodies to phenotype cells from bone marrow, lymph nodes, and pleural fluid, suggesting that the aptamer probe has value for clinical use.
authors.affiliation: Department of Pathology, The Methodist Hospital, Houston, TX 77030, USA.
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
authors.forename: Nianxi
authors.initials: N
authors.lastname: Zhao
authors.forename: Zihua
authors.initials: Z
authors.lastname: Zeng
authors.forename: Chung-Che
authors.initials: CC
authors.lastname: Chang
authors.forename: Youli
authors.initials: Y
authors.lastname: Zu
mesh_terms: D000906:Antibodies; D052157:Aptamers, Nucleotide / Q000737:chemistry; D001201:Ascites / Q000473:pathology; D001854:Bone Marrow Cells / Q000737:chemistry; D015704:CD4 Antigens / Q000032:analysis / Q000276:immunology*; D045744:Cell Line, Tumor; D003116:Color; D005434:Flow Cytometry / Q000379:methods; D006801:Humans; D016130:Immunophenotyping / Q000379:methods*; D019169:Jurkat Cells; D010996:Pleural Effusion / Q000473:pathology
chemical_list: D000906:Antibodies; D052157:Aptamers, Nucleotide; D015704:CD4 Antigens