Abstract
Arsenic contamination is a global health concern, primarily through contaminated groundwater and its entry into the food chain. The association between arsenic exposure and cardiovascular diseases (CVDs) is particularly alarming due to CVDs being the leading cause of death worldwide. Arsenic exposure has also been linked to changes in telomere length, mitochondrial DNA copy number (mtDNAcn), and deletion, further increasing the risk of CVDs. We aimed to determine whether arsenic exposure alters telomere length and mtDNAcn and deletion in a total of 50 CVD patients who underwent open heart surgery hailed from known arsenic-affected and unaffected areas in Bangladesh. Amount of arsenic was determined from the collected nails and cardiac tissues. Relative telomere length and mtDNAcn and deletion were quantified by qRT-PCR. The patients from arsenic-contaminated areas had higher average arsenic deposits in their fingers and toenails (P < 0.05) and higher cardiac tissue injury scores (P < 0.05). Moreover, approximately 1.5-fold shorter telomere length (P < 0.05, r = − 0.775), 1.2-fold decreased mtDNAcn (P < 0.05, r = − 0.797), and an 81-fold higher amount of mitochondrial DNA deletion (P < 0.05, r = 0.784) were observed in the patients who had higher arsenic deposition in their nails. Higher levels of arsenic exposure were found to be linked to shorter telomere length, decreased mtDNAcn, and increased mitochondrial DNA deletion in the patients from As-affected areas. It can also be anticipated that the correlation of arsenic exposure with telomere length, mtDNAcn, and deletion can be used as biomarkers for early diagnosis of arsenic-induced cardiovascular diseases.
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Acknowledgements
The authors acknowledge the Cardiac Surgery Department and the Pathology Department of Chittagong Medical College and Hospital and the patients who enthusiastically participated in the research.
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LK: Conceptualization, Methodology, Supervision, Review & Editing; SKB: Investigation, data analysis, Visualization & Data curation, Writing manuscript,; MARA: Formal analysis, Visualization, Data curation & manuscript preparation; RHC: Review & Editing manuscript, MJ: Methodology, Writing & Editing; AD:Writing Visualization & Data Curation, ZR: Methodology, Investigation & Review, NH: Sample Collection, Methodology & Review; MAF: Conceptualization, Methodology, Review & Editing.
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Khaleda, L., Begum, S.K., Apu, M.A.R. et al. Arsenic-Induced Cardiovascular Diseases and their Correlation with Mitochondrial DNA Copy Number, Deletion, and Telomere Length in Bangladeshi Population. Cardiovasc Toxicol 24, 27–40 (2024). https://doi.org/10.1007/s12012-023-09812-7
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DOI: https://doi.org/10.1007/s12012-023-09812-7