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Published on: June 10, 2013
Behavioral meaningful opioidergic stimulation activates kappa receptor gene expression
E Teodorov1, M F R Ferrari, D R Fior-Chadi
1Centro de Matemática, Computação e Cognição, Universidade Federal do ABC, São Paulo, SP, Brasil.
Summary
Kappa-opioid receptor agonist U69593 inhibited maternal behavior in female rats. This treatment also increased kappa-opioid receptor (Oprk1) gene expression in the periaqueductal gray (PAG).
Area of Science:
- Neuroscience
- Behavioral Endocrinology
- Molecular Biology
Background:
- The periaqueductal gray (PAG) is implicated in opioid-mediated pain regulation and female behavioral control.
- Opioid receptor subtype activity influences distinct behavioral and physiological responses.
Purpose of the Study:
- To investigate the impact of peripheral kappa-opioid receptor agonist (U69593) administration on maternal behavior.
- To examine the effects of U69593 on Oprk1 gene expression within the PAG of female rats.
Main Methods:
- Female Wistar rats received subcutaneous injections of U69593 or saline.
- Maternal behavior was assessed by scoring pup retrieval, grouping, crouching, and full maternal behavior.
- Oprk1, Oprm1, and Oprd1 gene expression in the PAG was quantified using real-time RT-PCR.
Main Results:
- U69593 administration significantly inhibited maternal behavior, reducing the percentage of dams exhibiting key maternal actions.
- A single U69593 injection elevated Oprk1 gene expression in the PAG of both virgin and lactating rats.
- No significant changes were observed in Oprm1 or Oprd1 gene expression.
Conclusions:
- Peripheral kappa-opioid receptor stimulation modulates Oprk1 gene expression in the PAG.
- Opioidergic transmission in adult females may involve simultaneous changes in kappa-opioid receptor gene expression.
- The opioid system plays a complex role in female reproduction.
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