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Salivary leucocytes as suitable biomatrix for the comet assay in human biomonitoring studies. Arch Toxicol 2021; 95:2179-2187. [PMID: 33787950 PMCID: PMC8009925 DOI: 10.1007/s00204-021-03038-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 03/25/2021] [Indexed: 10/29/2022]
Abstract
Peripheral blood leucocytes (PBL) have been traditionally used to investigate DNA damage by the comet assay in population studies, but validating alternative non-invasive samples would expand the application of this assay in human biomonitoring. The objectives of this study were (i) to test the validity of salivary leucocytes as a proper biomatrix for the comet assay, (ii) to evaluate the ability of this approach to detect different types of primary and oxidative DNA damage, and (iii) to determine whether frozen salivary leucocytes are still suitable for displaying those types of DNA damage. Fresh and frozen leucocytes isolated from saliva samples (six healthy non-smoking volunteers), were exposed to four genotoxic agents inducing different types of DNA damage, both primary (methyl methanesulfonate, actinomycin-D, ultraviolet radiation) and oxidative (potassium bromate), and standard or enzyme-modified comet assay was conducted. Results were compared with those obtained from PBL. Cells exposed to the four genotoxic agents showed dose-dependent increases of primary and oxidative DNA damage, demonstrating the suitability of all these samples to detect genetic damage from different origin. When comparing baseline levels of DNA damage, just a slight significant increase in primary DNA damage was observed in frozen salivary leucocytes regarding the other biomatrices, but similar results were obtained regarding sensitivity to DNA damage induction by all agents tested. This study demonstrates that salivary leucocytes can be employed in comet assay as an alternative or complement to blood samples. Frozen salivary leucocytes were proved to be a very convenient sample in large biomonitoring studies.
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B-Comet Assay (Comet Assay on Buccal Cells) for the Evaluation of Primary DNA Damage in Human Biomonitoring Studies. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17249234. [PMID: 33321868 PMCID: PMC7763633 DOI: 10.3390/ijerph17249234] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 11/29/2020] [Accepted: 12/07/2020] [Indexed: 12/16/2022]
Abstract
Many subjects perceive venous blood collection as too invasive, and thus moving to better-accepted procedures for leukocytes collection might be crucial in human biomonitoring studies (e.g., biomonitoring of occupational or residential exposure to genotoxins) management. In this context, primary DNA damage was assessed in buccal lymphocytes (BLs), fresh whole venous, and capillary blood leukocytes, and compared with that in peripheral blood lymphocytes (PBLs)—the most frequently used cells—in 15 young subjects. Mouthwashes were collected after the volunteers rinsed their mouths with normal saline, and BLs were isolated by density gradient centrifugation. Blood samples were collected by venipuncture or by lancet. Anthropometric and lifestyle information was obtained by the administration of a structured questionnaire. As shown in the Bland-Altman plots, the level of agreement between BLs and PBLs lied within the accepted range, we thus enrolled a wider population (n = 54) to assess baseline DNA damage in BLs. In these cells, mean values of tail length (µm), tail intensity (%), and tail moment were 25.7 ± 0.9, 6.7 ± 0.4 and 1.0 ± 0.1, respectively. No significant association was observed between sex and smoking habit with any of the DNA damage parameters. Conversely, underweight subjects displayed significantly higher genomic instability compared with normal weight group (p < 0.05). In conclusion, we successfully managed to set up and update a non-invasive and well-accepted procedure for the isolation of BLs from saliva that could be useful in upcoming biomonitoring studies.
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Paz MFCJ, Sobral ALP, Picada JN, Grivicich I, Júnior ALG, da Mata AMOF, de Alencar MVOB, de Carvalho RM, da Conceição Machado K, Islam MT, de Carvalho Melo Cavalcante AA, da Silva J. Persistent Increased Frequency of Genomic Instability in Women Diagnosed with Breast Cancer: Before, during, and after Treatments. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2018; 2018:2846819. [PMID: 30013718 PMCID: PMC6022262 DOI: 10.1155/2018/2846819] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 02/13/2018] [Indexed: 12/12/2022]
Abstract
This study aimed to evaluate DNA damage in patients with breast cancer before treatment (background) and after chemotherapy (QT) and radiotherapy (RT) treatment using the Comet assay in peripheral blood and the micronucleus test in buccal cells. We also evaluated repair of DNA damage after the end of RT, as well as the response of patient's cells before treatment with an oxidizing agent (H2O2; challenge assay). Fifty women with a mammographic diagnosis negative for cancer (control group) and 100 women with a diagnosis of breast cancer (followed up during the treatment) were involved in this study. The significant DNA damage was observed by increasing in the index and frequency of damage along with the increasing of the frequency of micronuclei in peripheral blood and cells of the buccal mucosa, respectively. Despite the variability of the responses of breast cancer patients, the individuals presented lesions on the DNA, detected by the Comet assay and micronucleus Test, from the diagnosis until the end of the oncological treatment and were more susceptible to oxidative stress. We can conclude that the damages were due to clastogenic and/or aneugenic effects related to the neoplasia itself and that they increased, especially after RT.
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Affiliation(s)
- Márcia Fernanda Correia Jardim Paz
- Laboratory of Genetic Toxicology, PPGBioSaúde and PPGGTA, Lutheran University of Brazil (ULBRA), Av. Farroupilha 8001, Prédio 22, Sala 22 (4° Andar), 92425-900 Canoas, RS, Brazil
- Laboratory of Genetic Toxicology, PPGCF, Federal University of Piauí, Av. Universitária S/N, Ininga, 64049-550 Teresina, PI, Brazil
- Post-Graduation Program in Biotechnology, RENORBIO, Federal University of Piauí, Av. Universitária, S/N, Ininga, 64049-550 Teresina, PI, Brazil
| | - André Luiz Pinho Sobral
- University Hospital of Piauí, Av. Universitária, S/N, Ininga, 64049-550 Teresina, PI, Brazil
| | - Jaqueline Nascimento Picada
- Laboratory of Genetic Toxicology, PPGBioSaúde and PPGGTA, Lutheran University of Brazil (ULBRA), Av. Farroupilha 8001, Prédio 22, Sala 22 (4° Andar), 92425-900 Canoas, RS, Brazil
| | - Ivana Grivicich
- Laboratory of Cancer Biology, PPGBioSaúde and PPGGTA, Lutheran University of Brazil (ULBRA), Av. Farroupilha 8001, Prédio 22, Sala 22 (4° Andar), 92425-900 Canoas, RS, Brazil
| | - Antonio Luiz Gomes Júnior
- Laboratory of Genetic Toxicology, PPGCF, Federal University of Piauí, Av. Universitária S/N, Ininga, 64049-550 Teresina, PI, Brazil
- Post-Graduation Program in Biotechnology, RENORBIO, Federal University of Piauí, Av. Universitária, S/N, Ininga, 64049-550 Teresina, PI, Brazil
- Biomedicine Department, UNINOVAFAPI University, Teresina, Brazil
| | - Ana Maria Oliveira Ferreira da Mata
- Laboratory of Genetic Toxicology, PPGCF, Federal University of Piauí, Av. Universitária S/N, Ininga, 64049-550 Teresina, PI, Brazil
- Post-Graduation Program in Biotechnology, RENORBIO, Federal University of Piauí, Av. Universitária, S/N, Ininga, 64049-550 Teresina, PI, Brazil
| | - Marcus Vinícius Oliveira Barros de Alencar
- Laboratory of Genetic Toxicology, PPGCF, Federal University of Piauí, Av. Universitária S/N, Ininga, 64049-550 Teresina, PI, Brazil
- Department of Biochemistry and Pharmacology, Federal University of Piauí, Av. Universitária, S/N, Ininga, 64049-550 Teresina, PI, Brazil
| | - Rodrigo Mendes de Carvalho
- Central Laboratory of Public Health of Piauí, Rua Dezenove de Novembro 1945, Bairro Primavera, 64002-570 Teresina, PI, Brazil
| | - Kátia da Conceição Machado
- Laboratory of Genetic Toxicology, PPGCF, Federal University of Piauí, Av. Universitária S/N, Ininga, 64049-550 Teresina, PI, Brazil
- Post-Graduation Program in Biotechnology, RENORBIO, Federal University of Piauí, Av. Universitária, S/N, Ininga, 64049-550 Teresina, PI, Brazil
| | - Muhammad Torequl Islam
- Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
- Faculty of Pharmacy, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
| | - Ana Amélia de Carvalho Melo Cavalcante
- Laboratory of Genetic Toxicology, PPGCF, Federal University of Piauí, Av. Universitária S/N, Ininga, 64049-550 Teresina, PI, Brazil
- Post-Graduation Program in Biotechnology, RENORBIO, Federal University of Piauí, Av. Universitária, S/N, Ininga, 64049-550 Teresina, PI, Brazil
| | - Juliana da Silva
- Laboratory of Genetic Toxicology, PPGBioSaúde and PPGGTA, Lutheran University of Brazil (ULBRA), Av. Farroupilha 8001, Prédio 22, Sala 22 (4° Andar), 92425-900 Canoas, RS, Brazil
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DNA damage and oxidative status in newly diagnosed, untreated, dipper and non-dipper hypertensive patients. Hypertens Res 2012; 36:166-71. [PMID: 23096232 DOI: 10.1038/hr.2012.156] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
DNA damage occurs more often in hypertensive patients than in non-hypertensive individuals. We sought to investigate lymphocyte DNA damage and total antioxidant status (TAS) levels in patients with dipper hypertension (DH) and non-dipper hypertension (NDH). Thirty-three patients with NDH (NDH group), 31 patients with DH (DH group) and 20 healthy volunteers (control group) were included in the study. Measurements from ambulatory blood pressure monitoring were obtained for all subjects. DNA damage was assessed in peripheral lymphocytes by comet assay, and plasma TAS levels were determined using an automated measurement method. The mean DNA damage value of the NDH group was higher than that of both the DH and control groups (P=0.002 and P<0.001, respectively). The mean DNA damage value of the DH group was higher than that of the control group (P<0.001). The mean TAS level of the NDH group was lower than that of both the DH and control groups (P=0.001 and P<0.001, respectively), and the mean TAS level of the DH group was lower than that of the control group (P<0.001). DNA damage was negatively associated with TAS level (r=-0.692, P<0.001) and positively associated with high sensitive c-reactive protein level (r=0.315, P=0.012). DNA damage increased in the NDH group compared with both the DH group and control group. This condition may be related to increased oxidative stress in the NDH group compared with the DH and control groups.
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