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Updated: Jun 13, 2026
Establishing a Device for Sleep Deprivation in Mice
Published on: September 22, 2023
Synergistic effect of decreased opioid activity and sleep deprivation on head-twitch response in mice
1Centre on Theoretical Problems in Physical and Chemical Pharmacology, Russian Academy of Sciences, Moscow, Russia. canyon1@rol.ru
Abstract:
In schizophrenia, an opioidergic understimulation and a decreased sleep duration are found. The pathogenic significance of these factors is unknown. The present study assessed the influence of the combination of the factors on serotonergic 2A (5-HT(2A)) receptors that are possibly related to psychosis development. 2,5-dimethoxy-4-iodoamphetamine (DOI)-induced head-twitch response in mice was used as a model of 5-HT(2A) receptor functioning. Mice underwent sleep deprivation and/or a blockade of opioidergic receptors with naloxone. To evaluate the involvement of 5-HT(2A) receptor in effects observed, animals were pretreated with MDL 100,907, a potent and selective antagonist of 5-HT(2A) receptor. As was found, 4h of sleep deprivation followed by administration of naloxone significantly increases the frequency of head twitches, with sleep deprivation and naloxone being ineffective alone. The action of the "sleep deprivation-opioid understimulation" combination is antagonized completely by MDL 100,907. Thus, some schizophrenia-associated factors can synergistically enhance the activity of 5-HT(2A) receptors. These results suggest the above factors being pathogenically relevant in schizophrenia.
Insights
Schizophrenia may involve opioid understimulation and reduced sleep duration. Combining these factors synergistically increases serotonin 2A receptor activity, suggesting a role in psychosis development.
Area of Science:
- Neuroscience
- Psychiatry
- Pharmacology
Background:
- Schizophrenia is associated with opioidergic understimulation and decreased sleep duration.
- The pathogenic significance of these factors, particularly in combination, remains unclear.
- Serotonergic 2A (5-HT(2A)) receptors are implicated in psychosis development.
Purpose of the Study:
- To investigate the combined influence of sleep deprivation and opioid receptor blockade on 5-HT(2A) receptor activity.
- To assess the potential synergistic effect of these factors in a mouse model.
Main Methods:
- Utilized the 2,5-dimethoxy-4-iodoamphetamine (DOI)-induced head-twitch response in mice as a model for 5-HT(2A) receptor function.
- Administered sleep deprivation (4 hours) and/or naloxone (opioid receptor antagonist).
- Pretreated animals with MDL 100,907, a selective 5-HT(2A) receptor antagonist, to assess receptor involvement.
Main Results:
- A combination of 4 hours of sleep deprivation followed by naloxone administration significantly increased head-twitch response frequency.
- Neither sleep deprivation nor naloxone alone produced a significant effect.
- MDL 100,907 completely antagonized the effects of the combined "sleep deprivation-opioid understimulation" treatment.
Conclusions:
- The combined factors of sleep deprivation and opioid understimulation synergistically enhance 5-HT(2A) receptor activity.
- These findings suggest that these combined factors may be pathogenically relevant in schizophrenia.
- This highlights a potential mechanism linking sleep disturbances and opioid system dysfunction to psychosis in schizophrenia.
