Key features and details
- Assay type: Cell-based (qualitative)
- Detection method: Colorimetric
- Assay time: 5 hr
- Sample type: Adherent cells, Tissue
Product nameTUNEL Assay Kit - HRP-DAB
See all DNA fragmentation kits
Sample typeTissue, Adherent cells
Assay typeCell-based (qualitative)
Assay time5h 0m
TUNEL Assay Kit - HRP-DAB ab206386 allows the recognition of apoptotic nuclei in paraffin-embedded tissue sections, frozen tissue sections, or in preparations of single cell suspensions fixed on slides.
The TUNEL assay is used to detect DNA fragmentation, such as in apoptosis. It uses terminal deoxynucleotidyl transferase (TdT) to catalyze the incorporation of deoxynucleotides at the free 3'-hydroxyl ends of fragmented DNA. The deoxynucleotides are then labeled in a variety of ways for detection of the degree of DNA fragmentation.
In this TUNEL assay protocol:
- terminal deoxynucleotidyl Transferase (TdT) binds to exposed 3’-OH ends of DNA fragments generated in response to apoptotic signals and catalyzes the addition of biotin-labeled deoxynucleotides
- biotinylated nucleotides are bound with a streptavidin-horseradish peroxidase (HRP) conjugate
- diaminobenzidine (DAB) reacts with the HRP labeled sample to generate an insoluble colored (brown) substrate at the site of DNA fragmentation
- counterstaining with methyl green aids in the evaluation of normal and apoptotic cells
This kit is designed for chromogenic TUNEL staining with HRP and DAB. It was previously called In situ Apoptosis Detection Kit (DAB).
To use FITC (Ex/Em = 495/519 nm) as a label, we recommend TUNEL Assay Kit - FITC (ab66108).
To use BrdU-Red (Ex/Em = 488/576nm) as a label, we recommend TUNEL Assay Kit - BrdU-Red (ab66110).
Find out more about the TUNEL method in the TUNEL staining / TUNEL assay guide.
The methyl green counterstain is water soluble and so a non-aqueous/organic mounting media needs to be used.
How other researchers have used HRP-DAB TUNEL Assay Kit ab206386
This TUNEL assay kit has been used in publications in a variety of sample types, including:
- Human: LX-2 cell cultures1
- Mouse (paraffin-embedded sections): abdominal aortic aneurysm lesion2, thyroid gland3, lung tissue4, heart5, liver6, ovary tissue7, skin8, liver9
- Rat: paraffin embedded heart10, brain tissue11
- Other: paraffin embedded human xenograft tumors in mice12, paraffin-embedded tissue from nude mice injected with human pancreatic cancer cell line13
References: 1-Park SM et al 2017, 2-Li et al 2019, 3-Iglesias-Osma MC et al 2019, 4-Yuan X et al 2018, 5-Ravi V et al 2018, 6-Jadhav K et al 2018, 7-Gao Y et al 2017, 8-Shin JM et al 2017, 9-Kim MH et al 2017 and 2016, 10-Zhang J et al 2018, 11-Xiao B et al 2017, 12-Nielsen CF et al 2017, 13-Dauer et al 2019
Storage instructionsStore at -20°C. Please refer to protocols.
Components 30 slides 60 slides 25X Conjugate 1 x 150µl 1 x 300µl Blocking Buffer 1 x 12ml 1 x 24ml DAB Solution 1 (DAB Concentrate) 1 x 150µl 1 x 300µl DAB Solution 2 (Substrate Reaction Buffer) 1 x 4ml 1 x 8ml Methyl Green Counterstain 1 x 3.5ml 2 x 3.5ml Proteinase K 1 x 50µl 1 x 100µl Stop Buffer 1 x 4ml 1 x 8ml TdT Enzyme 1 x 40µl 1 x 70µl TdT Equilibration Buffer 1 x 4ml 1 x 8ml TdT Labeling Reaction Mix 1 x 1.3ml 2 x 1.3ml
RelevanceInternucleosomal DNA fragmentation is a hallmark of apoptosis in mammalian cells.
Gao Y et al used In situ Apoptosis Detection Kit / TUNEL assay ab206386 to analyze tissue sections from mouse ovaries.
a. Section treated with DNase I as positive control
b. Negative control without TdT enzyme
c and f. representative experimental images.
Nuclei stained with the TUNEL assay are brown. Sections were counter-stained with Methyl Green.
Using paraffin fixed human tonsil tissue,10 μm sections (1000X). A] Section processed and counter-stained with methyl green according to the manual. B] Counter-stain step was eliminated to more clearly illustrate the level of positive staining in the germinal centres of tonsil tissue. C] Section treated with DNase I in order to generate a positive control slide. Note all nuclei stain positive. The use of DNase I generates free 3’-OH groups on cellular DNA, these free 3’-OH groups are then labelled with biotin-nucleotide by the TdT in the kit. D] Negative control, the TdT enzyme step was eliminated thereby generating a negative slide.
Using paraffin fixed human tonsil tissue, 10 μm sections (1000X)
ab206386 has been referenced in 83 publications.
- Li Z et al. Vaccine delivery alerts innate immune systems for more immunogenic vaccination. JCI Insight 6:N/A (2021). PubMed: 33690222
- Wang SH et al. Insulin-like growth factor binding protein 3 promotes radiosensitivity of oral squamous cell carcinoma cells via positive feedback on NF-?B/IL-6/ROS signaling. J Exp Clin Cancer Res 40:95 (2021). PubMed: 33712045
- Lin L et al. A circular RNA derived from PLXNB2 as a valuable predictor of the prognosis of patients with acute myeloid leukaemia. J Transl Med 19:123 (2021). PubMed: 33757550
- Lagnado A et al. Neutrophils induce paracrine telomere dysfunction and senescence in ROS-dependent manner. EMBO J 40:e106048 (2021). PubMed: 33764576
- McKelvey KJ et al. Glycolysis and Fatty Acid Oxidation Inhibition Improves Survival in Glioblastoma. Front Oncol 11:633210 (2021). PubMed: 33854970