Abstract
Long-term exposure to microgravity can cause alterations in the structure and function of the eyes, including the Harderian glands (HG) which are situated at the posterior part of the orbit in proximity to the eyeball. Whether microgravity will affect the morphology and function of HG and its mitochondrial homeostasis is not clear. In the present study, we investigated how tail suspension (TS) for 2 and 4 weeks (TS2 and TS4) affects mitochondrial ultrastructure and the underlying mechanisms involved in apoptosis, mitochondrial fission, autophagy, and fusion-related signaling in the HG. The results showed that after 2 weeks of TS treatment, the number of mitochondria in the HG of mice increased; however, the number of mitochondria in the TS4 group significantly decreased when compared to the TS2 group (p < 0.05). In the TS2 group, the rate of Parkin phosphorylation and the protein expression levels of OPA1, MFN1, and MFN2 were all found to be decreased. However, in the TS4 group, the rate of Parkin phosphorylation and the protein expression levels of OPA1 were increased compared with the TS2 group. In both TS groups, slight nuclear deformation and increased caspase-3 activity were observed. In general, the augmented quantity of mitochondria observed in the TS2 group may be attributed to reduced levels of mitochondrial autophagy and fusion. After 4 weeks of TS, the number of mitochondria decreased, which was attributed to an increase in the levels of mitochondrial autophagy and fusion. These findings indicate that mitochondria of HGs exhibit an adaptive response to the simulated microgravity environment, resulting in remodeling that enhances the completeness of mitochondrial morphology and structure.
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This work was supported by funds from the National Natural Science Foundation of China (No. 32201276).
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X.-C.W. and Z.W. conceived and designed the research; X.-C.W., Z.W., Y.-F.C., L.C., B.-M.Z., R.L., L.-N.J., and Y.-Z.F. performed the experiments; X.-C.W. analyzed the data; Z.W. interpreted the experimental results; X.-C.W. and Z.W. prepared the figures; X.-C.W., Z.W., and Y.-F.C. drafted the manuscript; and Z.W. and J.-H.X. edited the manuscript and approved the final version.
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Xing-Chen Wang and Zhe Wang contributed equally to this work.
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Wang, XC., Wang, Z., Chen, YF. et al. Stimulated Microgravity Affects Mitochondrial Homeostasis in the Harderian Glands of Mice. J Evol Biochem Phys 59, 1167–1181 (2023). https://doi.org/10.1134/S0022093023040129
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DOI: https://doi.org/10.1134/S0022093023040129