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Published on: July 29, 2014
Zingerone Alleviates Morphine Tolerance and Dependence in Mice by Reducing Oxidative Stress-Mediated NLRP3
Shahrzad Molavinia1,2, Mehrad Nikravesh3,4, Marzieh Pashmforoosh5
1Medicinal Plant Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
Abstract:
Morphine (MPH) is widely used for pain management; however, long-term MPH therapy results in antinociceptive tolerance and physical dependence, limiting its clinical use. Zingerone (ZIN) is a natural phenolic compound with neuroprotective effects. We investigated the effects of single and repeated doses of ZIN on MPH-induced tolerance, dependence, and underlying biochemical mechanisms. After a dose-response experiment, tolerance was developed to MPH (10 mg/kg, i.p.) for seven days. In the single-dose study, ZIN was administered on day seven. In the repeated-dose study, ZIN was administered for seven days. Naloxone (5 mg/kg, i.p., 120 min after MPH) was injected to assess withdrawal signs on day seven. The levels of thiobarbituric acid reactive substances (TBARS), nitric oxide (NO), total thiol (TT), and glutathione peroxidase (GPx) were measured in the prefrontal cortex. The protein levels of interleukin-1 beta (IL-1β) and NLRP3-ASC-Caspase-1 axis were assessed by ELISA and Western blotting, respectively. Results showed that ZIN (100 mg/kg) had no antinociceptive activity, and subsequent experiments were performed at this dose. Repeated ZIN reversed MPH antinociceptive tolerance, whereas single ZIN did not. Single and repeated ZIN attenuated naloxone-induced jumping. In addition, repeated ZIN significantly inhibited weight loss. Repeated ZIN suppressed the MPH-induced increase in TBARS, NO, IL-1β, NLRP3, ASC, and Caspase-1. It also inhibited MPH-induced TT and GPx reduction. In contrast, single ZIN had no effect. Findings suggest that ZIN reduces MPH-induced tolerance and dependence by suppressing oxidative stress and NLRP3 inflammasome activation. This study provides a novel therapeutic approach to reduce the side effects of MPH.
Insights
Zingerone (ZIN) may reduce morphine tolerance and dependence by combating oxidative stress and NLRP3 inflammasome activation. Repeated ZIN administration reversed morphine tolerance and withdrawal symptoms in preclinical models.
Area of Science:
- Pharmacology
- Neuroscience
- Natural Products Chemistry
Background:
- Long-term morphine (MPH) therapy for pain leads to tolerance and dependence, limiting its clinical utility.
- Zingerone (ZIN), a natural phenolic compound, exhibits neuroprotective properties.
- Investigating ZIN's potential to mitigate MPH-induced adverse effects is crucial for developing safer pain management strategies.
Purpose of the Study:
- To evaluate the effects of single and repeated Zingerone (ZIN) administration on morphine (MPH)-induced antinociceptive tolerance and physical dependence.
- To elucidate the underlying biochemical mechanisms, including oxidative stress and inflammasome activation, involved in ZIN's effects.
- To determine the optimal ZIN dosage for mitigating MPH side effects.
Main Methods:
- Tolerance was induced in rats using repeated daily intraperitoneal injections of morphine (10 mg/kg).
- Zingerone (100 mg/kg) was administered as a single dose or daily for seven days.
- Naloxone was used to precipitate withdrawal symptoms; biochemical markers (TBARS, NO, TT, GPx) and protein levels (IL-1β, NLRP3 inflammasome components) were measured in the prefrontal cortex.
Main Results:
- Repeated ZIN administration significantly reversed MPH-induced antinociceptive tolerance and attenuated naloxone-induced withdrawal signs (jumping, weight loss).
- Single ZIN administration did not show significant effects on tolerance or dependence.
- Repeated ZIN suppressed MPH-induced increases in oxidative stress markers (TBARS, NO) and inflammatory mediators (IL-1β, NLRP3 inflammasome), while restoring antioxidant levels (TT, GPx).
Conclusions:
- Repeated administration of Zingerone effectively reduces morphine tolerance and physical dependence in preclinical models.
- ZIN's therapeutic effects are mediated by the suppression of oxidative stress and NLRP3 inflammasome activation.
- Zingerone presents a promising therapeutic candidate for mitigating the adverse effects associated with chronic morphine use.
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