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Modeling human gray hair by irradiation as a valuable tool to study aspects of tissue aging

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Abstract

As one of the earliest and most visible phenomenon of aging, gray hair makes it a unique model system for investigating the mechanism of aging. Ionizing radiation successfully induces gray hair in mice, and also provides a venue to establish an organ-cultured human gray hair model. To establish a suitable organ-cultured human gray HF model by IR, which imitates gray hair in the elderly, and to explore the mechanisms behind the model. By detecting growth parameters, melanotic and senescence markers of the model, we found that the model of 5 Gy accords best with features of elderly gray hair. Then, we investigated the formation mechanisms of the model by RNA-sequencing. We demonstrated that the model of organ-cultured gray HFs after 5 Gy irradiation is closest to the older gray HFs. Moreover, the 5 Gy inhibited the expression of TRP-1, Tyr, Pmel17, and MITF in hair bulbs/ORS of HFs. The 5 Gy also significantly induced ectopically pigmented melanocytes and increased the expression of DNA damage and senescence in HFs. Finally, RNA-seq analysis of the model suggested that IR resulted in cell DNA damage, and the accumulation of oxidative stress in the keratinocytes. Oxidative stress and DNA damage caused cell dysfunction and decreased melanin synthesis in the gray HFs. We found that HFs irradiated at 5 Gy successfully constructed an appropriate aging HF model. This may provide a useful model for cost-effective and predictable treatment strategies to human hair graying and the process of aging.

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Data availability

The data that support the findings of this study have been deposited in Gene Expression Omnibus with the accession code: https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi.acc=GSE193386.

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Acknowledgements

We greatly appreciate the valuable technical support from Yan-wei Xu PhD, Xiao-xiong Zhou PhD, Jia-rui Zhang PhD and Yu-yang Gan PhD. We also would like to thank Editage (www.editage.cn) for English language editing.

Funding

This study was supported by the National Natural Science Foundation of China (Grant 81701929, No.81971889, No.81902013, No.82103763), the Natural Science Foundation of Guangdong Province (Grant No.2019A1515012170, Grant No.2020A1515110700). We also like to acknowledge all the patients and volunteers who have kindly contributed samples.

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All the authors agree with the contents of the manuscript and to have it published. Da-mao Dai: conceptualization, methodology, writing—review and editing, resources, formal analysis, project administration, investigation. Ye He & Qing Guan: Conceptualization, methodology, formal analysis, data curation, writing–original draft, visualization, investigation. Zhe-xiang Fan & Yun-min Zhu: Data Curation, Formal analysis, Resources, Investigation, Writing—Original Draft. Jin Wang: Conceptualization, validation, and investigation. Shu-lian Wu & Jian Chen: Data curation and formal analysis. De-meng-jie Le: Methodology and visualization. Zhi-qi Hu: Funding acquisition, supervision, writing, review, and editing. Qian Qu & Yong Miao: Funding acquisition, supervision, project administration, writing, review, and editing.

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Correspondence to Zhi-qi Hu, Qian Qu or Yong Miao.

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Dai, Dm., He, Y., Guan, Q. et al. Modeling human gray hair by irradiation as a valuable tool to study aspects of tissue aging. GeroScience 45, 1215–1230 (2023). https://doi.org/10.1007/s11357-022-00592-6

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