Abstract
Background:
We previously showed that aging accelerates after 3 months of exposure to hypoxia and environmental change but not genetic modifications. Here, we aimed to simply induce early-onset age-related hearing loss within a short period based on our previous method.
Methods:
We randomly divided 16 C57BL/6 mice into four groups that were maintained under conditions of normoxia and hypoxia with or without injected d-galactose for 2 months. Deteriorated hearing, the expression of age-related factors, and oxidative stress responses were detected using the click and tone burst auditory brainstem response test, reverse transcription-polymerase chain reaction, and by measuring superoxide dismutase (SOD).
Results:
The group maintained under hypoxia combined with d-galactose lost hearing particularly at 24 Hz and 32 Hz at 6 weeks compared with the other groups. Aging-related factors were also significantly decreased in the hypoxia and d-galactose groups. However, SOD levels did not significantly differ among the groups.
Conclusion:
Age-related hearing loss is an environmental disorder induced by chronic oxidative stress associated with genetic backgrounds. Our findings suggested that d-galactose and hypoxia can induce the phenotypes of age-related hearing loss and aging-associated molecules in a murine model within a short time with environmental stimulation alone.
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Acknowledgements
This research was supported by the Korean Fund for Regenerative Medicine(KFRM) grant funded by the Korea government(the Ministry of Science and ICT, the Ministry of Health & Welfare, 21A0101L0) and supported by "Regional Innovation Strategy (RIS)" through the National Research Foundation of Korea(NRF) funded by the Ministry of Education(MOE)(2022RIS-005).
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Batsaikhan, T., Choi, J.S., Ha, S.M. et al. d-Galactose and Hypoxia Induce the Early Onset of Age-Related Hearing Loss Deterioration in a Mouse Model. Tissue Eng Regen Med 20, 779–787 (2023). https://doi.org/10.1007/s13770-023-00547-8
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DOI: https://doi.org/10.1007/s13770-023-00547-8