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Absence of significant association of trace elements in nails with urinary KIM-1 biomarker among residents of Addis Ababa in Upper Awash Basin, Ethiopia: a cross-sectional study

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Abstract

The Akaki River in the Upper Awash Basin, which flows through Addis Ababa, the capital city of Ethiopia, has been highly polluted by sewage from factories and residential areas. A population-based cross-sectional study was used to assess the association between trace elements and kidney injury from residents living in polluted areas downstream (Akaki-Kality) versus upstream (Gullele) in Sub-Cities of Addis Ababa. A total of 95 individuals (53 from Akaki-Kality and 42 from Gullele) were included in the study. Kidney injury molecule 1 (KIM-1), lead, arsenic, cadmium, cobalt, lead, manganese, zinc, iron, copper, chromium and nickel were evaluated in residents’ urine and nail samples. A large proportion (74%) of the sample population contained KIM-1, including 81% residents in Akaki-Kality and 64% residents in Gullele. KIM-1 was, however, not significantly different (p = 0.05) between the two Sub-Cities, with median of 0.224 ng/mL in Akaki-Kality and 0.152 ng/mL in Gullele. Most of the analyzed elements, except Pb, As, Cd and Co, were found in all of the nail samples, with median (µg/g) in the range of 442‒714 Fe, 97.0‒246 Zn, 11.6‒24.1 Mn, 4.49‒5.85 Cu, 1.46‒1.66 Cr and 1.22‒1.41 Ni. The high incidence of KIM-1 indicates a potential for long term renal tubular damage among residents of the Sub-Cities. The concentrations of the elements in nails were, however, not significantly associated (p = 0.05) with the corresponding levels of KIM-1 in urine. Hence, the observed KIM-1 might be related to exposure to toxic substances or factors other than those included in this study.

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Acknowledgements

The authors thank the UK Research and Innovation’s Global Challenges Research Fund (GCRF) for supporting this research. The authors also thank Armauer Hansen Research Institute (AHRI) for covering the cost of biomarkers.

Funding

This work was supported by the Water Security and Sustainable Development Hub which is funded by the UK Research and Innovation’s Global Challenges Research Fund (GCRF), grant number: ES/S008179/1. The authors also thank Armauer Hansen Research Institute (AHRI) for covering the cost of biomarkers.

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Contributions

BKD: Methodology, Formal analysis, Investigation, Writing–original draft, Visualization, Writing–review & editing. BM, SRG, AFD, SM, and MLG: Conceptualization, Writing–review & editing. MO and YT: Software & Data curation. CLW, TA, AM and GZ: Conceptualization, Writing–review & editing, Supervision, Project administration, Resources, Supervision & Funding acquisition. All authors have read and agreed to the published version of the manuscript.

Corresponding author

Correspondence to Bitew K. Dessie.

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The authors declare no competing interests.

Ethical approval

The study obtained ethical clearance from the Ethical Review Board of Addis Ababa University, Ethiopia (CNSDO/496/10/2018).

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Written consent was obtained from all individual participants included in the study.

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Dessie, B.K., Mehari, B., Osman, M. et al. Absence of significant association of trace elements in nails with urinary KIM-1 biomarker among residents of Addis Ababa in Upper Awash Basin, Ethiopia: a cross-sectional study. Biometals 35, 1341–1358 (2022). https://doi.org/10.1007/s10534-022-00448-8

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  • DOI: https://doi.org/10.1007/s10534-022-00448-8

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