692, 611 (2010). Med. A similar decrease in the percentage CpG methylation following 5-Aza-dcR treatment for the CEA and the medium-throughput methylation sensitive comet assay (26.2 and 24 %) and comparatively lower decrease in percentage CpG methylation for the low-throughput methylation sensitive comet assay following 5-Aza-dcR treatment was seen (Figure 2). 52, 118125 (2012). Merck. Modulation of nucleotide excision repair in human lymphocytes by genetic and dietary factors. Cell isolation, stimulation and irradiation. Res. doi: 10.1016/j.bbrc.2010.09.002, Walsh, C. P., and Xu, G. L. (2006). It is also observed that among the colorectal cancer cell lines, cisplatin affects HCT-15 more than the others. 51, 39653971 (1991). Leitner-Dagan, Y. et al. In the MCF-7 and MDA-MB 231 cell lines, we clearly observed functional activity for all drugs. Then 50 l of this enzyme mixture was applied to each well and sealed with the silicone cap. 10.1093/annonc/mds339, Kim MM, Allen P, Gonzalez-Angulo AM, Woodward WA, Meric-Bernstam F, Buzdar AU, Hunt KK, Kuerer HM, Litton JK, Hortobagyi GN, Buchholz TA, Mittendorf EA: Pathologic complete response to neoadjuvant chemotherapy with trastuzumab predicts for improved survival in women with HER2-overexpressing breast cancer. Dusinska, M. et al. 45, 7380 (2009). Res. Use of the comet assay technique for quick and reliable prediction of https://doi.org/10.1038/s41596-020-0401-x, DOI: https://doi.org/10.1038/s41596-020-0401-x. Nat Protoc 2006, 1: 2329. Forchhammer, L. et al. 10.1055/s-0029-1242458, Article (2010). Electrophoresis took place at 30 V and 300 mA (between 0.8 and 0.9 V/cm) for 45 min at 4C, after which a pH neutralization step was performed by soaking the slides in 0.4 M TrisHCl buffer (pH 7.5) for 15 min. Mutat. PDF Automated Comet Assay Imaging and Dual-Mask Analysis to - Agilent Chatterjee K, Zhang J, Honbo N, Karliner JS: Doxorubicin cardiomyopathy. The authors thank the two anonymous referees whose valuable commentary allowed us to improve the manuscript. Each enzyme mixture was composed of 1.5 unit of MspI or HpaII, 10 l of Tango buffer (Fermentas) and filled to 100 l with molecular grade H2O. Res. Excluding side effects can greatly improve healing of carcinomas. 254, 23642369 (1979). doi: 10.1016/j.tiv.2005.04.011, Pubmed Abstract | Pubmed Full Text | CrossRef Full Text, Azqueta, A., Gutzkow, K. B., Brunborg, G., and Collins, A. R. (2011). Internet Explorer). Nutr. Proc. With p set to be 0.05, we estimated the ranges of DNA percentage in untreated and treated cells; where these ranges overlapped, the cells were rejected. After 24hrs of incubation, cells were detached by trypsinization (Trypsin-0.25% EDTA, 25200-072; Invitrogen) and 20000 cells were used for single cell gel electrophoresis with IKZUS comet assay kit (0905-050-K, IKZUS). . 18, 58785887 (2012): https://doi.org/10.1158/1078-0432.CCR-12-1380, Vodenkova, S., Azqueta, A., Collins, A. et al. DNA methylation: an introduction to the biology and the disease-associated changes of a promising biomarker. Bleomycin sulfate (Cat. J Natl Cancer Inst 2003, 95: 540547. Slyskova, J. et al. 117, 703708 (2009). Open Access articles citing this article. Res. Karnofsky DA: Nitrogen mustards in the treatment of neoplastic disease. PubMed Central Funct. A defined amount of rabbit muscle LDH (Sigma-Aldrich), equal to the amount released by 2.5 10 5 A549 cells (i.e., 707 mU/mL), was added to 1 mL of serum- and antibiotic free GTSF-2 medium at a pH range of 5.6-7.0. Searching for assay controls for the Fpg- and hOGG1-modified comet assay. doi: 10.1371/journal.pone.0079044, Nag, R., and Smerdon, M. J. doi: 10.4161/epi.1.1.2587, Li, Y. Q., Zhou, P. Z., Zheng, X. D., Walsh, C. P., and Xu, G. L. (2007). This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). (Lond.) PDF Glucose (GO) Assay Kit (GAGO20) - Technical Bulletin - MilliporeSigma 553, 103110 (2004). Mutagenesis 25, 113123 (2010). Microbiol. This study describes an approach to running slides in representative variants of the comet assay. Cite this article. The images or other third party material in this article are included in the articles Creative Commons licence, unless indicated otherwise in a credit line to the material. Cytogenetic markers, DNA single-strand breaks, urinary metabolites, and DNA repair rates in styrene-exposed lamination workers. designed figures; S.A.S.L. Influence of the OGG1 Ser326Cys polymorphism on oxidatively damaged DNA and repair activity. The samples were transferred to Whatman DE-81 ion exchange filters (Whatman) and washed three times with 1 phosphate-buffered saline (PBS). Br. Adv Intern Med 1950, 4: 175. Collins, A. R. et al. The isolated DNA was subsequently separately digested with the endonucleases MspI and HpaII (Fermentas). By analyzing the above data from many cells, the effect of a drug can be determined. o-Vanillin 99 148-53-8 - MilliporeSigma Base excision repair capacity in chronic renal failure patients undergoing hemodialysis treatment. Stoyanova, E. et al. PubMed drafted the paper; and A.C., M.D., P.M. In some cases, Comet assay was performed on cells pulse-labelled with 50 IdU 30 min before treatment to analyse DSBs in S . 10.1016/0014-4827(88)90265-0, DeSantis C, Ma J, Bryan L, Jemal A: Breast cancer statistics, 2013. 112, 867871 (2004). Lohr, M. et al. The CEA reaction mixture consisted of 5 Taq buffer, 25 mM MgCl2, 5 U of GoTaq enzyme (Promega), and 0.1 l of [3H] deoxycytidine triphosphate (dCTP; GE Healthcare) in a final volume of 15 l. A high score means that the cells have been damaged, and the most DNA is in tail. Applied Filters: Keyword:'comet assay' Showing 1-1 of 1 result for "comet assay" within Products. These authors contributed equally: Sona Vodenkova, Amaya Azqueta. To improve the low-throughput methylation sensitive comet assay, a 12-well gasket was used for the preparation of the comet slides and enzyme digestion. Res. Langie, S. A. et al. DNA methylation of HepG2 cells treated with 5-Aza-dcR. Comet assay require only a few of a patients cells, which can be easily isolated from whole blood. 58, 74657471 (2010). The comet assay is a cost-effective, sensitive, and simple technique, which is traditionally used for analyzing and quantifying DNA damage in individual cells (Fairbairn et al., 1995; Azqueta et al., 2011). Res. M0880-1g) were obtained from Sigma-Aldrich Corp. Calf thymus DNA-sodium salt (ct-DNA), sodium phosphate monobasic, . Here we now describe combining a medium-throughput comet assay and a low-throughput methylation sensitive comet assay, to produce a methylation sensitive medium-throughput comet assay. According to literature data, the optimal concentration of each drug varies by cell type and cancer type. Mutat. All authors read and approved the final manuscript. & Sierra, L. M. Drosophila comet assay: insights, uses, and future perspectives. 66, 1168311689 (2006). This modified method also overcomes edge-effects as observed when the traditional frosted glass slides are used. CAS Available at: https://www.mne.psu.edu/me345/Lectures/outliers.pdf [accessed April 8, 2014]. Cell survival after DNA damage in the comet assay, https://academic.oup.com/mutage/article/32/6/e1/4844756#121612377, https://doi.org/10.1007/s10565-007-9047-5, https://doi.org/10.1158/1078-0432.CCR-12-1380, Measuring DNA modifications with the comet assay: a compendium of protocols, Hedyotis diffusae Herba-Andrographis Herba inhibits the cellular proliferation of nasopharyngeal carcinoma and triggers DNA damage through activation of p53 and p21, The comet assay: a method to measure DNA damage in individual cells, Sign up for Nature Briefing: Translational Research. (2013). J. Neurol. 95, 13121319 (2003). 682, 1320. Res. Modifications were made to the alkaline comet assay to detect changes in the levels of DNA methylation in single cells (Wentzel et al., 2010), using the 1 gel/slide format. The adaption of the comet assay to measure global methylation relies on the isoschizomeric properties of the two restriction enzymes: MspI and HpaII. Comet assay data for cancer cell lines representing colorectal cancer. (2010). Hasplova, K. et al. Cancer 1975, 36: 881892. Environ. Oral exposure is one of the potential routes of exposure in humans. Doxorubicin (trade name Adriamycin) is often used in chemotherapy combinations such as AC (doxorubicin-cytoxan), ATC (doxorubicin-cyclophosphamide-Taxol), AT (doxorubicin-taxotere), and FAC (fluorouracil-doxorubicin-cytoxan) [16, 17]. Toxicol. DNA methylation is not only important for maintaining genome stability but also plays an important role in gene regulation (Bird, 2002; Nag and Smerdon, 2009). Google Scholar. A., Pereira-Wilson, C. & Collins, A. R. Protective effects of ursolic acid and luteolin against oxidative DNA damage include enhancement of DNA repair in Caco-2 cells. As previously mentioned, these enzymes recognize the same tetranucleotide sequence (5-CCGG 3) but display differential sensitivity to DNA methylation (Figure 1). Opin. Cancer Res. The slides were subsequently submerged in lysing solution (consisting of 5M sodium chloride (NaCl; SigmaAldrich), ethylenediaminetetraacetic acid (EDTA; SigmaAldrich), 10% dimethyl sulfoxide [DMSO; Merck) and 1% Triton X-100 (Merck)] at 4C for 16 h to prepare nucleoids. Cancer Res. Health Perspect. Measurement of oxidative damage to DNA in nanomaterial exposed cells and animals. The results are expressed as percentage CpG methylation and are calculated using the ratio between the average percentage tail DNA of HpaII- and MspI-digested DNA. 10.3322/caac.21203, Haggar FA, Boushey RP: Colorectal cancer epidemiology: incidence, mortality, survival, and risk factors. F: The percentage of DNA in tail is reduced after cisplatin incubation; however the data are not significant. Cancer Res. All samples were counted twice, and the average was calculated with sigma = 2%. Health Perspect. 601, 5060 (2008). A.O., I.G. 44, 7181. J. Agric. By submitting a comment you agree to abide by our Terms and Community Guidelines. Resistance to chemotherapy agents may exist before, or develop during, therapy [3]. Toxicol. However, identifying optimal treatment for an individual patient can be difficult, time-consuming and expensive. A bootstrap replication number of 10,000 were employed with a 95% confidence interval. 5, 217 (2014). Setayesh, T. et al. Borghini, A., Roursgaard, M., Andreassi, M. G., Kermanizadeh, A. Oxidatively damaged DNA in rats exposed by oral gavage to C60 fullerenes and single-walled carbon nanotubes. doi: 10.1016/j.mam.2007.05.005, Dusinska, M., and Collins, A. R. (2008). The calculated percentage CpG methylation is 62.2 and 58.6% for untreated cells and 44.0 and 34.6% for 5-Aza-dcR-treated cells detected by the low-throughput and medium-throughput methylation sensitive comet assays, respectively. The comet assay is an affordable and flexible method which can be easily adapted for the measurement of global DNA methylation. comet assay. Anglique Lewies, Etresia Van Dyk, Johannes F. Wentzel, and Pieter J. Pretorius (principal investigator) designed the study. A comparison of the distribution of the percentage CpG methylation of the low-throughput methylation sensitive comet assay in comparison to the medium-througput methylation sensitive comet assay is depicted in Figure 3. Biochem. The versatility of the comet assay is further expanded through the modifications made in this study, increasing the number of observations that can be made with a single experiment and reducing the amount of labor and inter-experimental variability. The comet images were captured with an Olympus IX70 fluorescence microscope (200 magnification) and scored using Comet IV computer software version 4.3.1 (Perceptive Instruments Ltd). The Comet assay (or Single Cell Gel Electrophoresis assay) is a sensitive technique to detect DNA damage at the level of an individual cell. In the current study the previously modified method (Wentzel et al., 2010) was further adapted by using Fast Digest versions of the HpaII and MspI restriction endonucleases and the 12 gels/slide format of the comet assay (Shaposhnikov et al., 2010). Telomere length and genotoxicity in the lung of rats following intragastric exposure to food-grade titanium dioxide and vegetable carbon particles. Mol. Keywords: medium-throughput comet assay, global DNA methylation, 5-Aza-dcR, single cells, cytosine extension assay (CEA), isoschizomeric restriction endonuclease, Citation: Lewies A, Van Dyk E, Wentzel JF and Pretorius PJ (2014) Using a medium-throughput comet assay to evaluate the global DNA methylation status of single cells. Cancer Res. Genes Dev. Al-Serori, H. et al. A volume of 20 l (1520 cells/l) of this mixture was cautiously applied to each well and the aluminium gasket was placed on ice for 5 min for the LMPA to set. (2010). Neutral Comet Assay - Life Science Network Springer Nature. PubMed & Skoog, L. Age-related decrease of ultraviolet light-induced DNA repair synthesis in human peripheral leukocytes. 34, 717723. Mutagenesis 26, 461471 (2011). Comets created by the treating nucleoids with the isoschizomeric enzymes MspI and HpaII. Radiology 2012, 263: 5363. J. Wildl. Abstracts of the 12th International Comet Assay Workshop held at the University of Navarra, Pamplona, Spain, 2931 August 2017. We determined the levels of two main pathways of DNA DSBsnonhomologous end joining (NHEJ) and homologous recombination repair (HRR). Cimbala, J. M. (2011). J. Pharmacol. Clin. Variation in assessment of oxidatively damaged DNA in mononuclear blood cells by the comet assay with visual scoring. 10.1016/S1028-4559(09)60296-5, Article & Moller, P. Repair activity of oxidatively damaged DNA and telomere length in human lung epithelial cells after exposure to multi-walled carbon nanotubes. Results from the conventional 1 gel/slide format (low-throughput comet assay) was compared to the use of 12 gels/slide format (medium-throughput comet assay) using the Fast Digest versions of HpaII and MspI and validated with the established CEA (Pogribny et al., 1999). PubMed Biophys. These challenges and limitations are; however, not unique to the methylation sensitive comet assay but are encountered in other adaptions of the comet assay as well. 10.1159/000265166, Haagenson KK, Wu GS: The role of MAP kinases and MAP kinase phosphatase-1 in resistance to breast cancer treatment. PubMed 736, 122129 (2012). The global 5-CCGG-3 methylation can be calculated by the HpaII/MspI ratio. No. Association of Dnmt3a and thymine DNA glycosylase links DNA methylation with base-excision repair. 5:215. doi: 10.3389/fgene.2014.00215. Collins, A. R., Ord, M. J. J. Nutr. Paz-Elizur, T. et al. Alkaline lysis of the cells was performed according to manufacturers instructions. However, fast, reliable results are urgently needed; moreover, a drugs effect cannot always be predicted by measuring gene expression [5]. Cancer Res. Hydroquinone: Assessment of genotoxic potential in the 12, 10071010 (2013). (2000). In the later method the enzyme/buffer mixture tends to evaporate, which changes the enzymatic reaction conditions. Natl Acad. C: The same cell line post-incubation with melphalan. Hereditary tyrosinemia type 1 metabolites impair DNA excision repair pathways. Acta 1219, 724727 (1994). Some of the challenges and limitations of the methylation sensitive comet assay as previously reported (Wentzel and Pretorius, 2012) include, limited sample throughput, insufficient enzyme digestion of nucleoids and drying of agarose before enzyme digestion is complete. The authors declare that the majority of the data shown here as examples or anticipated results are available in the original papers. Shaposhnikov, S. et al. 5, 288 (2014). The slides are then placed in a damp plastic container lined with towel paper that was preheated to 37C. DNA methylation and the functional organization of the nuclear compartment. The head is composed of intact DNA, while the tail consists of damaged (single-strand or double-strand breaks) or broken pieces of DNA. Toxicol. Single Cell Gel Electrophoresis (SCGE), also known as comet assay can measure DNA damage in individual eukaryotic cells. 10.1002/1097-0142(197509)36:3<881::AID-CNCR2820360309>3.0.CO;2-B, Rosenberg B, VanCamp L, Trosko JE, Mansour VH: Platinum compounds: a new class of potent antitumour agents. Modulation of DNA repair capacity and mRNA expression levels of XRCC1, hOGG1 and XPC genes in styrene-exposed workers. High-throughput comet assay using 96 minigels. Caple, F. et al. Res. doi: 10.1016/j.mrrev.2008.11.001, van Dyk, E., Steenkamp, A., Koekemoer, G., and Pretorius, P. J. STI571 reduces NER activity in BCR/ABL-expressing cells. Presentation of comet assay data by using a five-grade scale. Single cell gel electrophoresis combined with lesion-specific enzymes to measure oxidative damage to DNA. GERSTEL Twisters were . In the experiments described here, a medium-throughput comet assay and methylation sensitive comet assay are combined to produce a methylation sensitive medium-throughput comet assay to measure changes in the global DNA methylation pattern in individual cells under various growth conditions. Turker, M. S., and Bestor, T. H. (1997). Quality Level. Lett. In theory, when these restriction enzymes are used in the comet assay, a higher level of methylation of the CpG dinucleotides should result in a larger difference in the amount of DNA in the comet tails of HpaII-digested nucleoids versus MspI-digested nucleoids. Redox and epigenetic regulation of the APE1 gene in the hippocampus of piglets: the effect of early life exposures. the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Carcinogenesis 30, 308314 (2009). In the present study we showed that the comet assay can be modified to measure global DNA methylation in single cells in a medium-throughput manner. 45, 112113 (2007). We offer one of the broadest portfolios in the industry for scientists, best-in-class products for pharmaceutical development and manufacturing, and a fully integrated service organization to support CDMO and contract testing across traditional and novel modalities. Exposure to ultrafine particles from ambient air and oxidative stress-induced DNA damage. Borst P, Wessels L: Do predictive signatures really predict response to cancer chemotherapy? Google Scholar, Yauk, C., Lambert, I., Marchetti, F. & Douglas, G. AOP 15. (1984). 175, 184191. in Laboratory Methods in Cell Biology, Vol. Assay Reagent to the first tube and mixing. Mutagenesis 33, 919 (2018). Comet Assay - wwwqws.sigmaaldrich.com 103, 490501 (2010). Nanomed. The experimental data demonstrated that personalized treatment is essential in cancer treatment. CAS Are glutathione S transferases involved in DNA damage signalling? & Melvin, R. Nutritional modulation of DNA repair in a human intervention study. Mutagenesis 23, 143151 (2008). Visual comet scoring revisited: a guide to scoring comet assay slides . Free Radic. Nutr. DNA damage and repair activity after broccoli intake in young healthy smokers. Comet assays are a sensitive means of detecting both single strand and double strand DNA damage, using only a few cells. Clin. Also, in some cases, like LoVo, the cisplatin is probably ineffective. Even though theoretically the percentage tail DNA following MspI treatment represents all of the 5-CCGG-3 sites in the DNA, it is important to note that when using MspI and HpaII only the methylated cytosines outside of CpG islands are quantified as these enzymes tend to mainly recognize sequences outside of CpG islands. 56, 97110 (2015). PubMed Health Perspect. doi: 10.1016/0014-4827(88)90265-0, Speit, G., Vasquez, M., and Hartmann, A. Statistical analysis was done with Prism 5 (GraphPad). Roman, Y., Bomsel-Demontoy, M. C., Levrier, J., Chaste-Duvernoy, D. & Jalme, M. S. Effect of hemolysis on plasma protein levels and plasma electrophoresis in birds. 695, 7580 (2010). 10.1148/radiol.12111177, Olive PL, Banth JP: The comet assay: a method to measure DNA damage in individual cells. Cisplatin binds to DNA to cause cross linking, which leads to apoptosis; it is often combined with other chemotherapy drugs in cancer treatment [15]. J. If material is not included in the articles Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. Sci. The use of the comet assay over other methods such as CEA for the measurement of global DNA methylation offers the advantage that it is less expensive.
Maxi-cosi Pria Max 3-in-1 Convertible Car Seat Manual, Kind Led Xl1000 Grow Light, Small Business Bloomberg, Best German Face Creams, Volleyball Match 2022, Featherlite Opus Hb Chair, Ibm Project Management Apprenticeship,
