Cell Meter™ Fixed Cell and Tissue TUNEL Apoptosis Assay Kit Green Fluorescence

HeLa cells were fixed and treated with or without DNAse for 60 mins at 37 °C. The cells were then stained with Cell Meter™ TUNEL apoptosis assay kit. DNA strand breaks showed intense fluorescent staining in DNAse treated cells. The signal was acquired with fluorescence microscope using a FITC filter set.

TUNEL assay of formalin-fixed paraffin-embedded (FFPE) human lung adenocarcinoma sections with Cell Meter™ Fixed Cell and Tissue TUNEL Apoptosis Assay Kit *Green Fluorescence* (Cat#22851). DNA strand breaks showed intense fluorescent staining in DNAse treated tissue section.  Cell nucleus was stained with Nuclear Blue™ DCS1 (Cat#17548).

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Telephone	1-800-990-8053
Fax	1-800-609-2943
Email	sales@aatbio.com
Quotation	Request
International	See distributors
Shipping	Standard overnight for United States, inquire for international

Spectral properties

Absorbance (nm)	487
Correction Factor (260 nm)	0.32
Correction Factor (280 nm)	0.35
Extinction coefficient (cm ^-1 M ^-1)	80000¹
Excitation (nm)	498
Emission (nm)	517
Quantum yield	0.7900¹, 0.95²

Storage, safety and handling

H-phrase	H303, H313, H333
Hazard symbol	XN
Intended use	Research Use Only (RUO)
R-phrase	R20, R21, R22
UNSPSC	12171501

Alternative formats

Cell Meter™ Fixed Cell and Tissue TUNEL Apoptosis Assay Kit *Blue Fluorescence*

Cell Meter™ Fixed Cell and Tissue TUNEL Apoptosis Assay Kit *Red Fluorescence*

Cell Meter™ Fixed Cell and Tissue TUNEL Apoptosis Assay Kit *Deep Red Fluorescence*

Overview SDS Protocol

Absorbance (nm)

487

Correction Factor (260 nm)

0.32

Correction Factor (280 nm)

0.35

Extinction coefficient (cm ^-1 M ^-1)

80000¹

Excitation (nm)

498

Emission (nm)

517

Quantum yield

0.7900¹, 0.95²

Cell Meter™ Fixed Cell and Tissue TUNEL Apoptosis Assay Kit provides a robust tool for conveniently detecting DNA fragmentation caused by apoptosis. The assay is a non-radioactive, simple, accurate and rapid method for monitoring apoptosis in. fixed cells and tissues via imaging DNA fragmentation. The TUNEL assay uses terminal deoxynucleotidyl transferase (TdT) to catalyze the incorporation of fluorescein-12-dUTP at the 3’-hydroxyl ends of the fragmented DNA. The fluorescein-labeled DNA is analyzed by fluorescence microscopy or flow cytometry (excitation at 488 nm with 530/30 nm emission filter). The kit can be used to detect apoptosis in fixed cells and formalin-fixed, paraffin-embedded tissue sections.

Platform

Flow cytometer

Excitation	488 nm laser
Emission	530/30 nm filter
Instrument specification(s)	FITC channel

Fluorescence microscope

Excitation	FITC filter set
Emission	FITC filter set
Recommended plate	Black wall/clear bottom

Components

Example protocol

AT A GLANCE

Protocol summary

Treat samples as desired
Fix cells with 4% formaldehyde solution for 30 minutes on ice
Permeabilize cells with 70% ice-cold ethanol for 60 minutes on ice
Add TdT staining solution to samples and incubate for 60 minutes at 37 °C
Monitor the fluorescence intensity using fluorescence microscopy with FITC filter set

Important

Bring all the kit components at room temperature before starting the experiment.

PREPARATION OF WORKING SOLUTION

TdT staining solution

For one test, Mix the following to make a total volume of 51 µL;
45 µL TdT Reaction Buffer (Component D)
5 µL CoCl2 (Component C)
0.5 µL Fluorescein 12-dUTP (Component B)
0.5 µL TdT enzyme (Component A).
Note TdT staining solution should be used promptly.

SAMPLE EXPERIMENTAL PROTOCOL

Protocol for cells staining

The following protocol can be used as a guideline and should be optimized according to the needs.

Treat your samples as desired.
Wash the samples with buffer of your choice such as PBS containing Ca⁺² and Mg⁺².
Fix the samples by adding 100 µL of 4% paraformaldehyde in PBS and incubate the samples for 30 minutes on ice.
Remove fixation solution and wash samples with PBS.
Add 100 µL of 70% of ice cold ethanol to samples and incubate the samples for 60 minutes on ice.
Note Samples can be stored at -20 °C at this step for several days before use.
Remove alcohol and wash cells with PBS.
Note For a positive control, incubate fixed samples with 2-5 µg/mL of DNAse in PBS containing Ca⁺² and Mg⁺² for 60 minutes at 37 °C. Remove the DNAse and wash cells thoroughly and continue with the rest of the protocol
Add 50 µL of TdT staining solution to the samples and incubate for 60 to 120 minutes at 37 °C.
Remove TdT working solution and wash samples with PBS.
Resuspend the samples in PBS and monitor the fluorescence intensity with flow cytometer using 530 /30 nm filter (FITC channel) or fluorescence microscope with FITC filter set.

Protocol for tissue staining

The following protocol can be used as a guideline and should be optimized according to the needs.
Deparaffinization and rehydration protocol

Deparaffinize tissue sections (attached to the microscopic slides) by immersing slides in fresh xylene in a Coplin jar for 5 minutes at room temperature. Repeat one more time. (Total 2 washes)
Wash the samples by immersing the slides in 100% ethanol for 5 minutes at room temperature in a Coplin jar.
Rehydrate the samples by immersing the slides through various concentrations of alcohol subsequently (100, 95, 85, 70, 50%) for 5 minutes each at room temperature
Wash the samples by immersing the slides in 0.85% NaCl for 5 minutes at room temperature.
Wash the samples by immersing the slides in PBS for 5 minutes at room temperature. Repeat one more wash. (Total 2 washes)

Fixation protocol

Fix the tissue sections by immersing slides in 4% paraformaldehyde solution in PBS for 15-20 minutes at room temperature.
Wash the samples by immersing the slides in PBS for 5 minutes at room temperature. Repeat one more wash. (Total 2 washes)
Remove the liquid and place the slides on a flat surface. Treat tissue sections with 100 µL of 20 µg/mL Proteinase K solution. Add enough to cover the entire tissue surface. Incubate slides for 10 minutes at room temperature.
Wash the samples by immersing the slides in PBS for 5 minutes at room temperature.
Fix the tissue sections by immersing slides in 4% paraformaldehyde solution in PBS for 15-20 minutes at room temperature.
Wash the samples by immersing the slides in PBS for 5 minutes at room temperature. Repeat one more wash. (Total 2 washes)

Staining protocol

Optional: For a positive control, incubate fixed samples with 2-5 µg/mL of DNAse in PBS containing Ca⁺² and Mg⁺² for 60 minutes at 37 °C. Remove the DNAse and wash cells thoroughly with PBS and continue with the rest of the protocol.
Add 50 µL of TdT staining solution to the samples and incubate for 60 to 120 minutes at 37 °C.
Remove TdT working solution and wash samples with PBS.
Add mounting medium with DAPI (AAT Bioquest Cat# 20005) and monitor the fluorescence intensity fluorescence microscope with FITC filter set.

Spectrum

Open in Advanced Spectrum Viewer

Spectral properties

Absorbance (nm)	487
Correction Factor (260 nm)	0.32
Correction Factor (280 nm)	0.35
Extinction coefficient (cm ^-1 M ^-1)	80000¹
Excitation (nm)	498
Emission (nm)	517
Quantum yield	0.7900¹, 0.95²

Product Family

Name	Excitation (nm)	Emission (nm)	Extinction coefficient (cm ^-1 M ^-1)	Correction Factor (260 nm)	Correction Factor (280 nm)
Cell Meter™ Fixed Cell and Tissue TUNEL Apoptosis Assay Kit Blue Fluorescence	411	472	-	0.14	0.12
Cell Meter™ Fixed Cell and Tissue TUNEL Apoptosis Assay Kit Red Fluorescence	544	570	100000	0.27	0.34
Cell Meter™ Fixed Cell and Tissue TUNEL Apoptosis Assay Kit Deep Red Fluorescence	649	664	250000	-	0.027

Images

Figure 1. HeLa cells were fixed and treated with or without DNAse for 60 mins at 37 °C. The cells were then stained with Cell Meter™ TUNEL apoptosis assay kit. DNA strand breaks showed intense fluorescent staining in DNAse treated cells. The signal was acquired with fluorescence microscope using a FITC filter set.

Figure 2. TUNEL assay of formalin-fixed paraffin-embedded (FFPE) human lung adenocarcinoma sections with Cell Meter™ Fixed Cell and Tissue TUNEL Apoptosis Assay Kit *Green Fluorescence* (Cat#22851). DNA strand breaks showed intense fluorescent staining in DNAse treated tissue section. Cell nucleus was stained with Nuclear Blue™ DCS1 (Cat#17548).

Citations

View all 4 citations: Citation Explorer

Inhibition of lung microbiota-derived proapoptotic peptides ameliorates acute exacerbation of pulmonary fibrosis
Authors: D’Alessandro-Gabazza, Corina N and Yasuma, Taro and Kobayashi, Tetsu and Toda, Masaaki and Abdel-Hamid, Ahmed M and Fujimoto, Hajime and Hataji, Osamu and Nakahara, Hiroki and Takeshita, Atsuro and Nishihama, Kota and others,
Journal: Nature communications (2022): 1--23

Protection of propofol on liver ischemia reperfusion injury by regulating Cyp2b10/Cyp3a25 pathway
Authors: Wu, Jinli and Yu, Chao and Zeng, Xianggang and Xu, Yini and Sun, Chengyi
Journal: Tissue and Cell (2022): 101891

Effects of Boric Acid on Invasion, Migration, Proliferation, Apoptosis, Cell Cycle and miRNAs in Medullary Thyroid Cancer Cells
Authors: Y{\i}ld{\i}r{\i}m, Onurcan and Se{\c{c}}me, M{\"u}cahit and Dodurga, Yavuz and Mete, G{\"u}l{\c{c}}in Abban and Fenkci, Semin Melahat
Journal: (2021)

Exosomes Derived from M2 Macrophages Exert a Therapeutic Effect via Inhibition of the PI3K/AKT/mTOR Pathway in Rats with Knee Osteoarthritic
Authors: Da-Wa, Zha Xi and Jun, Ma and Chao-Zheng, Liu and Sen-Lin, Yang and Chuan, Lu and De-Chun, Li and Zu-Nan, Dong and Hong-Tao, Zhao and Shu-Qing, Wei and Xian-Wei, Pei and others,
Journal: BioMed Research International (2021)

References

View all 50 references: Citation Explorer

Improvement of in situ Follicular Activation and Early Development in Cryopreserved Human Ovarian Cortical Tissue by Co-Culturing with Mesenchymal Stem Cells.
Authors: Hosseini, Marzieh and Salehpour, Saghar and Ghaffari Novin, Marefat and Shams Mofarahe, Zahra and Abdollahifar, Mohammad-Amin and Piryaei, Abbas
Journal: Cells, tissues, organs (2020): 1-11

Exosomes derived from adipose tissue, bone marrow, and umbilical cord blood for cardioprotection after myocardial infarction.
Authors: Xu, Huiyu and Wang, Zhongchao and Liu, Longmei and Zhang, Baoxia and Li, Bao
Journal: Journal of cellular biochemistry (2020): 2089-2102

RHEB gene therapy maintains the chondrogenic characteristics and protects cartilage tissue from degenerative damage during experimental murine osteoarthritis.
Authors: Ashraf, S and Kim, B J and Park, S and Park, H and Lee, S-H
Journal: Osteoarthritis and cartilage (2019): 1508-1517

Tissue kallikrein-related peptidase8 protects rat heart against acute ischemia reperfusion injury.
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The role of Toll-like receptor 4 in apoptosis of brain tissue after induction of intracerebral hemorrhage.
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Journal: Journal of neuroinflammation (2019): 234

Vitrification freezing of large ovarian tissue in the human body.
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Journal: Journal of ovarian research (2019): 77

Correlation of MiR-152 expression with VEGF expression in placental tissue of preeclampsia rat and its influence on apoptosis of trophoblast cells.
Authors: Zhang, L and Yuan, J-M and Zhao, R-H and Wang, L-M and Tu, Z-B
Journal: European review for medical and pharmacological sciences (2019): 3553-3560

IL-10 inhibits apoptosis in brain tissue around the hematoma after ICH by inhibiting proNGF.
Authors: Song, L and Xu, L-F and Pu, Z-X and Wang, H-H
Journal: European review for medical and pharmacological sciences (2019): 3005-3011

Comparison between Slow Freezing and Vitrification for Human Ovarian Tissue Cryopreservation and Xenotransplantation.
Authors: Lee, Sanghoon and Ryu, Ki-Jin and Kim, Boram and Kang, Dahyeon and Kim, Yoon Young and Kim, Tak
Journal: International journal of molecular sciences (2019)

Exosomal miR-320d derived from adipose tissue-derived MSCs inhibits apoptosis in cardiomyocytes with atrial fibrillation (AF).
Authors: Liu, Lina and Zhang, Haoran and Mao, Hongyu and Li, Xiaohong and Hu, Yamin
Journal: Artificial cells, nanomedicine, and biotechnology (2019): 3976-3984