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Beneficial Effect of Melatonin on Motor and Memory Disturbances in 6-OHDA-Lesioned Rats

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Abstract

Previous evidence has shown a link between neurodegenerative diseases, including Parkinson's disease (PD), and melatonin. The data in the literature about the impact of the hormone under different experimental PD conditions are quite controversial, and its effect on memory impairment in the disease is very poorly explored. The current research was aimed at investigating the role of melatonin pretreatment on memory and motor behavior in healthy rats and those with the partial 6-hydroxydopamine (6-OHDA) model of PD. All rodents were pretreated with melatonin (20 mg/kg, intraperitoneally) for 5 days. At 24 h and 7 days after the first treatment for healthy rats, and at the second and third week post-lesion for those with PD, the animals were tested behaviorally (apomorphine-induced rotations, rotarod, and passive avoidance tests). The neurochemical levels of dopamine (DA), acetylcholine (ACh), noradrenaline (NA), and serotonin (Sero) in the brain were also determined. The results showed that in healthy animals, melatonin pretreatment had amnestic and motor-suppressive effects and did not change the levels of measured brain neurotransmitters. In animals with PD, melatonin pretreatment exerted a neuroprotective effect, manifested as a significantly decreased number of apomorphine-induced rotations, reduced number of falls in the rotarod test, and improved memory performance. The brain DA and ACh concentrations in the same animals were restored to the control levels, and those of NA and Sero did not change. Our results demonstrate a beneficial effect of melatonin on memory and motor disturbance in 6-OHDA-lesioned rats.

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Acknowledgements

Proper acknowledgements to other works is given.

Funding

This study was made possible with the financial support of the Institute of Neurobiology at the Bulgarian Academy of Sciences.

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Conceptualization—Lyubka Tancheva, Luciano Saso; Funding acquisition—Reni Kalfin; Investigation—Maria Lazarova, Lyubka Tancheva, Miroslava Stefanova, Diamara Uzunova; Validation—Atanas G. Atanasov; Resources—Reni Kalfin; Visualization—Maria Lazarova; Writing of original draft—Lyubka Tancheva, Maria Lazarova; Writing of review & editing—Reni Kalfin.

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Correspondence to Reni Kalfin.

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The authors declare no competing interests

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All experiments with laboratory animals have been performed strictly according to the national regulations and European Communities Council Directive (86/609/EEC) and the “Principles of laboratory animal care” (NIH publication No. 85–23) concerning the protection of animals used for scientific and experimental purposes.

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Tancheva, L., Lazarova, M., Saso, L. et al. Beneficial Effect of Melatonin on Motor and Memory Disturbances in 6-OHDA-Lesioned Rats. J Mol Neurosci 71, 702–712 (2021). https://doi.org/10.1007/s12031-020-01760-z

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  • DOI: https://doi.org/10.1007/s12031-020-01760-z

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