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- Title
Effect of Chloroquine on Hyoscine-Induced Memory Impairment in Mice: Possible Involvement of Opioids and Nitric Oxide.
- Authors
Mohammadi, Parsa; Karimi, Elaheh; Maleki, Adeleh; Rahimi, Nastaran; Fakhraei, Nahid; Boroujeni, Saina Saadat; Solaimanian, Shahabaddin; Dehpour, Ahmad Reza
- Abstract
Supporting evidence suggests the possible neuroprotective potential of chloroquine, an antimalaria medication. Moreover, reports indicate that endogenous opioids and nitric oxide (NO) play role of a mediator by chloroquine's effects. In the present study, the effects of chloroquine on hyoscine-induced memory impairment were assessed. Furthermore, the possible involvements of opioids and NO were evaluated. Chloroquine was administered intraperitoneally (i.p.) at doses of 0.1, 0.5, 1, 3, 10, and 20 mg/kg to hyoscine-treated (1 mg/kg, i.p.) mice, and the spatial and fear memories were evaluated using Y-maze and passive-avoidance tasks, respectively. Also, to provide further evidence about chloroquine's mechanism of action, the opioid receptors and the NO production were blocked using two nonselective antagonist's naltrexone and L-NAME, respectively. Chloroquine at doses of 0.5, 10, and 20 mg/kg furtherly damaged the impaired memory of hyoscine-treated mice and at doses of 10 and 20 mg/kg impaired the memory of salinetreated mice in the passive avoidance task. Additionally, chloroquine at doses of 0.5 and 1 mg/kg improved the spatial memory in hyoscine-treated mice in the Y-maze test. In addition, naltrexone (3 mg/kg) reversed the neuroprotective effect of chloroquine (1 mg/kg) in hyoscine-treated mice in the Y-maze task. It could be concluded that chloroquine at low doses may improve cognitive performance by involving the opioid receptors; as a result, blocking the opioid receptors may reverse chloroquine's neuroprotective effect. Notably, chloroquine at high doses did not improve the memory, and in combination with hyoscine, it caused even more damage to long-term memory.
- Subjects
MEMORY disorders; NITRIC oxide; CHLOROQUINE; OPIOID receptors; OPIOID peptides
- Publication
Acta Medica Iranica, 2022, Vol 60, Issue 2, p82
- ISSN
0044-6025
- Publication type
Article