Selected nucleosides for measurement of cancer marker and detection of newly synthesized DNA and RNA.
Marker nucleosides such as 1-Methyl-adenosine, 5-Methyl-uridine, N3-Methyl-uridine and Pseudouridine are found to be
elevated in assocation with cancer[1-3]. Jena Bioscience offers proper nucleoside standards for their measurement.
Detection of de novo DNA synthesis or S-Phase synthesis is perfomed with modified nucleosides which are efficiently incorporated into proliferating cells and labeled subsequently. Br-dU can be tagged with the corresponding antibody [4-6]. 5-EdU will make the newly synthesized DNA visible when cells are incubated subsequently with a fluorescent azide, which is rapidly "click"-coupled to the alkyne group of 5-EdU. In contrast to Br-dU, the method does not require sample fixation or DNA denaturation and permits good structural preservation [7,8]. Analog 5-Ethynyl-2'-deoxy-cytidine can be used to detect DNA synthesis with similar sensitivity as EdU .
Based on the same principle, 5-EU can be used for detection of RNA transcription and turnover in vivo. As it is incorporated into RNA transcripts, 5-EU-labeled cellular RNA can be detected quickly and with high sensitivity with fluorescent azides .
 Seidel et al. (2006) Modified nucleosides: an accurate tumour marker for clinical diagnosis of cancer, early detection and therapy control. Br J Cancer 94:1726.
 Bullinger et al. (2007) Metabolic signature of breast cancer cell line MCF-7: profiling of modified nucleosides via LC-IT MS coupling. BMC Biochem 29:25.
 Kim et al. (2001) Capillary electrophoretic profiling and pattern recognition analysis of urinary nucleosides from uterine myoma and cervical cancer patients. Journal of Chromatography B: Biomedical Sciences and Applications 754:97.
 Gratzner et al. (1992) Monoclonal antibody to 5-bromo and 5-iododeoxyuridine: a new reagent for detection of DNA replication. Science 218:474.
 Qin et al. (1993) Comparison of the classical autoradiographic and the immunohistochemical methods with BrdU for measuring proliferation parameters in colon cancer. Anticancer Res 13:731.
 Morstyn et al. (1986) Immunohistochemical identification of proliferating cells in organ culture using bromodeoxyuridine and a monoclonal antibody. J Histochem Cytochem 34(6):697.
 Salic et al. (2008) A chemical method for fast and sensitive detection of DNA synthesis in vivo. Proc. Natl. Acad. Sci. USA 105 (7):2415.
 Buck et al. (2008) Detection of S-phase cell cycle progression using 5-ethynyl-2'-deoxyuridine incorporation with click chemistry, an alternative to using 5-bromo-2'-deoxyuridine antibodies. Biotechniques 44 (7 :927.
 Jao et al. (2009) Exploring RNA transcription and turnover in vivo by using click chemistry. Proc. Nat. Acad. Sci. USA 105 (41):15779.
 Qu et al. (2011) 5-Ethynyl-2'-deoxycytidine as a new agent for DNA labeling: detection of proliferating cells. Anal Biochem 417(1 :112.