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Folic acid alleviated oxidative stress-induced telomere attrition and inhibited apoptosis of neurocytes in old rats

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Abstract

Purpose

Oxidative stress has been reported to cause telomere attrition, which triggers cell apoptosis. Apoptosis of neurocytes may play an essential role in the pathogenesis of neurodegenerative diseases. This study hypothesized that folic acid (FA) supplementation decreased neurocyte apoptosis by alleviating oxidative stress-induced telomere attrition in 25-month-old Sprague Dawley (SD) rats.

Methods

Three-month-old male SD rats were randomly divided into four diet groups by different concentrations of folic acid in equal numbers, with intervention for 22 months. Folate, homocysteine (Hcy), reactive oxygen species (ROS) levels, antioxidant activities, and telomere length in the brain tissues were tested at 11, 18, and 22 months of intervention, and 8-hydroxy-deoxyguanosine (8-OHdG) levels, neurocyte apoptosis and telomere length in the cerebral cortex and hippocampal regions were tested during the 22-month intervention. An automated chemiluminescence system, auto-chemistry analyzer, Q-FISH, qPCR, and TUNEL assay were used in this study.

Results

The rats had lower folate concentrations and higher Hcy, ROS, and 8-OHdG concentrations in brain tissue with aging. However, FA supplementation increased folate concentrations and antioxidant activities while decreasing Hcy, ROS, and 8-OHdG levels in rat brain tissue after 11, 18, and 22 months of intervention. Furthermore, FA supplementation alleviated telomere length shortening and inhibited neurocyte apoptosis during the 22-month intervention.

Conclusion

FA supplementation alleviated oxidative stress-induced telomere attrition and inhibited apoptosis of neurocytes in 25-month-old rats.

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Data availability

The data supporting this study's findings are available on request from the corresponding author upon reasonable request.

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Funding

This research was supported by a grant from the National Natural Science Foundation of China (No. 81730091), Tianjin Research Innovation Project for Postgraduate Students (No. 2021YJSB280).

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Contributions

Wen Li designed the research, revised the manuscript, and proofread the article as the corresponding author. Dezheng Zhou and Yue Sun completed the experiment, analysis of the data, and drafted the manuscript as the first authors. Cuixia Dong, Zehao Wang, Jing Zhao, and Zhenshu Li completed the rats intervention work together. Guowei Huang designed the research. All authors have read and agreed to the published version of the manuscript. The authors declare no potential conflict of interest.

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Correspondence to Wen Li.

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The authors declare that they have no conflicts of interest.

Compliance with ethical standards

The Tianjin Medical University Animal Ethics Committee approved the experimental protocols of this study (TMUaMEC2019003).

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Zhou, D., Sun, Y., Dong, C. et al. Folic acid alleviated oxidative stress-induced telomere attrition and inhibited apoptosis of neurocytes in old rats. Eur J Nutr 63, 291–302 (2024). https://doi.org/10.1007/s00394-023-03266-x

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