title: Enzymatic product-mediated stabilization of CdS quantum dots produced in situ: application for detection of reduced glutathione, NADPH, and glutathione reductase activity.
abstract: Glutathione is the most abundant nonprotein molecule in the cell and plays an important role in many biological processes, including the maintenance of intracellular redox states, detoxification, and metabolism. Furthermore, glutathione levels have been linked to several human diseases, such as AIDS, Alzheimer disease, alcoholic liver disease, cardiovascular disease, diabetes mellitus, and cancer. A novel concept in bioanalysis is introduced and applied to the highly sensitive and inexpensive detection of reduced glutathione (GSH), over its oxidized form (GSSG), and glutathione reductase (GR) in human serum. This new fluorogenic bioanalytical system is based on the GSH-mediated stabilization of growing CdS nanoparticles. The sensitivity of this new assay is 5 pM of GR, which is 3 orders of magnitude better than other fluorogenic methods previously reported.
authors: CICbiomaGUNE, Parque Tecnológico de San Sebastián, Paseo Miramón 182, 20009, Donostia-San Sebastián, Spain.
authors: Gaizka
authors: G
authors: Garai-Ibabe
authors: Laura
authors: L
authors: Saa
authors: Valeri
authors: V
authors: Pavlov
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry*; D005978:Glutathione / Q000032:analysis* / Q000378:metabolism; D019803:Glutathione Disulfide / Q000032:analysis* / Q000378:metabolism; D005980:Glutathione Reductase / Q000032:analysis* / Q000378:metabolism; D006801:Humans; D009249:NADP / Q000032:analysis* / Q000378:metabolism; D010084:Oxidation-Reduction; D045663:Quantum Dots; D013440:Sulfides / Q000737:chemistry*
chemical_list: D019187:Cadmium Compounds; D013440:Sulfides; C034939:cadmium sulfide; D009249:NADP; D005980:Glutathione Reductase; D005978:Glutathione; D019803:Glutathione Disulfide