title: Silica nanowire conjugated with loop-shaped oligonucleotides: A new structure to silence cysteine proteinase gene in Leishmania tropica.
abstract: The main aim of this study was to evaluate the capability of silica nanowire conjugated with loop-shaped oligonucleotides (SNWCLSOs) to silence cysteine proteinase b (Cpb) gene in Leishmania (L) tropica. On the other hand, its toxicity on amastigotes and mouse peritoneal macrophages was evaluated by 5-diphenyl-tetrazolium bromide (MTT) assay. For control, two loop-shaped oligonucleotides (LSO) were considered. LSO1 and LSO2 were 5'-NH2-cccccaaaaaaaaaaaaaaaaaaaaaaaaaggggg-COOH-3' and LSO2: 5'-NH2-cccccttttttttttttttttttttttttttttttttttttttggggg-COOH-3', respectively. After 72 h incubation at 37 °C, AMSNW, LSO1, and LSO2 had no remarkable toxicity on L. tropica amastigote (2 × 10(5)/mL) and mouse peritoneal macrophages (2 × 10(5)/mL). In case of SNWCLSOs, they had high toxicity on L. tropica amastigote, but they had no effect on mouse peritoneal macrophages. At concentrations of 1, 10, and 25 μg/mL, AMSNW, LSO1 and LSO2 had no effect on the gene expression. But, at concentration of 50 and 100 μg/mL, decrease of gene expression was observed. In case of SNWCLSOs, they could dramatically decrease the gene expression. It could be concluded that since SNWCLSOs could silence Cpb gene with no remarkable toxicity, they are good choice for treat cutaneous leishmaniasis in future. As a new agent, it must be checked in vivo.
authors.affiliation: Department of Medical Parasitology & Mycology, The School of Medicine, Yazd Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
authors.forename: Ali Fatahi
authors.initials: AF
authors.lastname: Bafghi
authors.affiliation: Department of Laboratory Sciences, School of Paramedicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran; Reproductive Immunology Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. Electronic address: alijebal2011@gmail.com.
authors.forename: Ali
authors.initials: A
authors.lastname: Jebali
authors.affiliation: Department of Medical Nanotechnology, Pajoohesh Lab, Yazd, Iran.
authors.forename: Karim
authors.initials: K
authors.lastname: Daliri
mesh_terms: D001483:Base Sequence; D057056:Cysteine Proteases / Q000235:genetics*; D016054:DNA, Protozoan; D015870:Gene Expression; D017125:Genes, Protozoan; D007895:Leishmania tropica / Q000201:enzymology* / Q000235:genetics; D008855:Microscopy, Electron, Scanning; D008969:Molecular Sequence Data; D053770:Nanowires; D009841:Oligonucleotides / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*
chemical_list: D016054:DNA, Protozoan; D009841:Oligonucleotides; D012822:Silicon Dioxide; D057056:Cysteine Proteases
keywords: Cysteine proteinase; Leishmania tropica; Loop-shaped oligonucleotides; Silica nanowire