TUNEL Assay

Format: Microscopy

Form: 50 Tests

Detection Method: Colorimetric

Species Reactivity: a broad range of species

Assay Time: 4 h

Sample Type: Frozen or paraffin sections or fixed-cell preparations

Kit Contents: Counterstain, Proteinase K, Equilibration and Labeling Buffers, TdT Enzyme (Cat. No. PF060), Stop Buffer, Blocking Buffer, 50X Conjugate, DAB, Positive and Negative Control Slides, H2O2/Urea Tablets, Methyl Green Counterstain, and a user protocol.

Comments: Non-isotopic kit for the detection of apoptosis at the individual cell level. Apoptotic morphology is easily detected. This kit allows the recognition of apoptotic nuclei in paraffin-embedded tissue sections, tissue cryosections, or in cell preparations fixed on slide by Fragment End Labeling (FragEL™) of DNA. Terminal deoxynucleotidyl transferase (TdT) binds to exposed ends of DNA fragments generated in response to apoptotic signals and catalyzes the template-dependent addition of biotin-labeled and unlabeled deoxynucleotides. Biotinylated nucleotides are detected using streptavidin-horseradish peroxidase (HRP) conjugate. Diaminobenzidine reacts with the labeled sample to generate an insoluble colored product at the site of DNA fragmentation. Counterstaining with methyl green aids in the morphological evaluation and characterization of normal and apoptotic cells.

Ref.: Xiao, D. and Bullock, R. 1996. J. Neurosurgery 85, 655. Gu, Y., et al. 1994. Endocrinology 135, 1272. Gavrieli, Y., et al. 1992. J. Cell Biol. 119, 493. Fawthrop, D. J., et al. 1991. Arch. Toxicol. 65, 437. Martin, S.J., et al. 1990. J. Immunology 145, 1859. Wyllie, A. H. 1980. Nature 284, 555. Kerr, J. F. R., et al. 1972. Br. J. Cancer 26, 239.

R: 23/25-36/37/38-42/43-45-61; S: 26-36/37/39-45-53