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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Addiction and Health
- نوع مقاله: Journal Article
- کلمات کلیدی: Rats,Empathy,Pain perception,morphine dependence
- چکیده:
- چکیده انگلیسی: Background: Empathy is the capability to represent the mental and emotional states of other subjects.
Previous studies have demonstrated a possible correlation between morphine addiction and altered empathy
response in morphine-addicted subjects. This study was performed to evaluate the effect of chronic morphine
exposure as an animal model of morphine addiction on empathic changes in affective and sensory pain.
Methods: Adult male Wistar rats (3 months old) were used for the current study. Animals were grouped in
cages of two (n = 8 for each group) and one animal was selected as the pain observer group. Pain observer
animals received either saline or morphine (10 mg/kg, twice daily for 8 days). At ninth day, formalin [50 µg,
5%, subcutaneous (SC)] was injected into the hindpaw of the cagemate and placed inside the cage. Elevated
plus maze (EPM) and open field test (OFT) were recruited to evaluate anxiety; hot plate and tail flick tests
were used to assay sensory pain. Conditioned place aversion (CPA) was also measured as indicator of
affective pain component.
Findings: Chronic morphine exposure led to a reduced level of anxiety in EPM and OFT assays. An opioidinduced hyperalgesia was observed in the sensory pain assays, while there was a reduced affective pain in the
CPA paradigm in morphine-treated animals.
Conclusion: It might be plausible that chronic morphine exposure might alter empathy for pain through
affective and not sensory pain pathways
- انتشار مقاله: 10-09-1399
- نویسندگان: Masoud Nazeri-Rezaabad,Zahra Jamalpoor,Mohammad Sadegh Alemrajabi,Masoomeh Nozari,Moazamehosadat Razavinasab,Akram Nezhadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Addiction and Health
- نوع مقاله: Journal Article
- کلمات کلیدی: anxiety,Morphine,Rats,Empathy
- چکیده:
- چکیده انگلیسی: Background: Empathy is defined as the ability to simulate the mental states of others. Recent studies have
demonstrated empathy-like behaviors in other animals including rats and mice. The objective of the current
study was to evaluate the effect of acute administration of morphine and naloxone on cognition and
nociception changes following observing conspecifics undergoing nociceptive stimulus.
Methods: Adult male Wistar rats were used (n = 8 for each group). One cagemate received formalin injection
into the hindpaw five times within a nine-day period and the other cagemate observed the pain while being
pretreated with saline, morphine, or naloxone [10 mg/kg, intraperitoneal (i.p.)]. Pain behaviors, anxiety-like
behaviour, locomotion, balance and muscle strength were evaluated in the observer animals.
Findings: Observing a cagemate in pain increased anxiety-like behavior and reduced thermal pain threshold in the
observer animals. Administration of morphine reversed these effects and naloxone did not affect the responses.
Conclusion: Results of the current study reveal an important role for opioid receptors (ORs) in empathy for
pain, so that activation of this system dampens the empathy-like responses.
- انتشار مقاله: 17-09-1398
- نویسندگان: Masoud Nazeri,Akram Nezhadi,Mohammad Shabani
- مشاهده