Abstract
This study aimed to determine the effects of mitotherapy on learning and memory and hippocampal kynurenine (Kyn) pathway, mitochondria function, and dendritic arborization and spines density in aged rats subjected to chronic mild stress. Twenty-eight male Wistar rats (22 months old( were randomly divided into Aged, Aged + Mit, Aged + Stress, and Aged + Stress + Mit groups. Aged rats in the stress groups were subjected to different stressors for 28 days. The Aged + Mit and Aged + stress + Mit groups were treated with intracerebroventricular injection (10 µl) of fresh mitochondria harvested from the young rats’ brains, and other groups received 10 µl mitochondria storage buffer. Spatial and episodic-like memories were assessed via the Barnes maze and novel object recognition tests. Indoleamine 2,3-dioxygenase (IDO) expression and activity, Kyn, Tryptophan (TRY), ATP levels, and mitochondrial membrane potential (MMP) were measured in the hippocampus region. Golgi-Cox staining was also performed to assess the dendritic branching pattern and dendritic spines in the hippocampal CA1 subfield. The results showed that mitotherapy markedly improved both spatial and episodic memories in the Aged + Stress + Mit group compared to the Aged + Stress. Moreover, mitotherapy decreased IDO protein expression and activity and Kyn levels, while it increased ATP levels and improved MMP in the hippocampus of the Aged + Stress + Mit group. Besides, mitotherapy restored dendritic atrophy and loss of spine density in the hippocampal neurons of the stress-exposed aged rats. These findings provide evidence for the therapeutic effect of mitotherapy against stress-induced cognitive deterioration in aged rats by improving hippocampal mitochondrial function and modulation of the Kyn pathway.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This study has been derived from the Ph.D. dissertation of Mrs. Gonja Javani titled “Mitochondrial Transplantation Improves Anxiety- and Depression-like Behaviors in Aged Stress-exposed Rats.“ The financial support for this study was provided by the Neurosciences Research Center of Tabriz University of Medical Sciences.
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This work was supported by the Neurosciences Research Center of Tabriz University of Medical Sciences (Grant Number: 63881).
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All authors contributed to the study conception and design. Material preparation and data collection and analysis were performed by GJ, FF, AG-N, and GM. The first draft of the manuscript was written by GJ, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Javani, G., Babri, S., Farajdokht, F. et al. Mitotherapy restores hippocampal mitochondrial function and cognitive impairment in aged male rats subjected to chronic mild stress. Biogerontology 24, 257–273 (2023). https://doi.org/10.1007/s10522-022-10014-x
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DOI: https://doi.org/10.1007/s10522-022-10014-x