Abstract
Background
Epigenetic mechanisms may affect the ideal and non-ideal kidneys selected for transplantation and their inflammatory gene expression profile differently and may contribute to poor clinical outcomes.
Objective
Study the Global DNA methylation and the expression profiles of the DNA methyltransferases (DNMTs) and nuclear factor kappa B (NF-κB) in preimplantation kidney biopsies from ideal and non-ideal kidneys (expanded criteria donor (ECD) and with KDPI > 85%).
Methods
In a sample consisting of 45 consecutive pre-implantation biopsies, global DNA methylation levels were detected by LINE-1 repeated elements using bisulfite pyrosequencing. DNMT gene expression was assessed by real-time quantitative polymerase chain reaction, and NF-κB protein expression by immunofluorescence.
Results
ECD kidneys displayed increased methylation levels in LINE-1, and DNMT1 and DNMT3B expression was upregulated when comparing ECD to standard criteria donor kidneys. Similarly, kidneys with KDPI > 85% exhibited increased LINE-1 methylation and DNMT1 upregulation when compared to a KDPI ≤ 85%. NF-κB protein expression levels were greatly increased in both types of non-ideal kidneys compared to ideal kidneys. Moreover, hypermethylation of LINE-1 was associated with cold ischemia time > 20 h and ECD kidney classification.
Conclusions
This study shows that global DNA hypermethylation and high expression of NF-κB occurred in both types of non-ideal kidneys and were associated with prolonged cold ischemia time. Global DNA methylation can be a useful tool to assess non-ideal kidneys and hence, could be used to expand the pool of kidneys donors.
Graphical abstract
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Data availability statement
The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
This study was supported by São Paulo State Research Foundation (FAPESP–Fundação de Amparo à Pesquisa do Estado de São Paulo) Grant Number 2016/08301-8.
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This study was approved by the institution’s Medical School Research Ethics Committee (# 2.003.464), following current standards for research involving human beings.
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do Nascimento Gonçalves, N., Caldas, H.C., da Silva Florim, G.M. et al. Distinct global DNA methylation and NF-κB expression profile of preimplantation biopsies from ideal and non-ideal kidneys. J Nephrol 35, 1831–1840 (2022). https://doi.org/10.1007/s40620-022-01341-w
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DOI: https://doi.org/10.1007/s40620-022-01341-w