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Parental Exposure to Morphine Before Conception Decreases Morphine and Cocaine-Induced Locomotor Sensitization in Male Offspring Publisher Pubmed



Heidari A1 ; Hajikarimhamedani A1 ; Hosseindoost S2, 3 ; Ghane Y4 ; Sadatshirazi M5 ; Zarrindast MR6
Authors
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Authors Affiliations
  1. 1. Faculty of Medicine, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
  2. 2. Pain Research Center, Neuroscience Institute, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Brain and Spinal Cord Injury Research Center, Neuroscience Institute, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
  5. 5. Development, Molecular & Chemical Biology, Tufts University, Boston, MA, United States
  6. 6. Department of Pharmacology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran

Source: Developmental Psychobiology Published:2024


Abstract

Repeated exposure to abused drugs leads to reorganizing synaptic connections in the brain, playing a pivotal role in the relapse process. Additionally, recent research has highlighted the impact of parental drug exposure before gestation on subsequent generations. This study aimed to explore the influence of parental morphine exposure 10 days prior to pregnancy on drug-induced locomotor sensitization. Adult male and female Wistar rats were categorized into morphine-exposed and control groups. Ten days after their last treatment, they were mated, and their male offspring underwent morphine, methamphetamine, cocaine, and nicotine-induced locomotor sensitization tests. The results indicated increased locomotor activity in both groups after drug exposure, although the changes were attenuated in morphine and cocaine sensitization among the offspring of morphine-exposed parents (MEPs). Western blotting analysis revealed altered levels of D2 dopamine receptors (D2DRs) in the prefrontal cortex and nucleus accumbens of the offspring from MEPs. Remarkably, despite not having direct in utero drug exposure, these offspring exhibited molecular alterations affecting morphine and cocaine-induced sensitization. The diminished sensitization to morphine and cocaine suggested the development of a tolerance phenotype in these offspring. The changes in D2DR levels in the brain might play a role in these adaptations. © 2024 Wiley Periodicals LLC.
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