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Estrogen pretreatment modulates morphine-induced conditioned place preference in ovariectomized mice
Hilda Mirbaha1, Mohammad Tabaeizadeh, Hamidreza Shaterian-Mohammadi
1Department of Pharmacology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
Pharmacology, Biochemistry, and Behavior
|May 26, 2009
Summary
Estradiol enhances morphine reward, as shown by conditioned place preference (CPP) in mice. Estradiol deficiency increases the morphine dose needed for rewarding effects.
Area of Science:
- Neuroscience
- Endocrinology
- Pharmacology
Background:
- Estrogen is a key hormone influencing neurotransmission and brain function.
- Understanding estrogen's role in reward pathways is crucial for addiction research.
Purpose of the Study:
- To investigate the impact of estradiol on the rewarding effects of morphine.
- To examine estradiol's own rewarding properties in ovariectomized mice.
Main Methods:
- Utilized the conditioned place preference (CPP) paradigm in adult female mice.
- Compared sham-operated and ovariectomized mice.
- Administered varying doses of morphine and estradiol benzoate (EB).
Main Results:
- Sham-operated mice exhibited significant morphine-induced CPP.
- Ovariectomized mice showed reduced CPP and a rightward shift in the morphine dose-response curve.
- Estradiol benzoate administration reversed these effects and induced CPP in ovariectomized mice.
Conclusions:
- Estradiol significantly facilitates morphine's rewarding effects.
- Estradiol deficiency elevates the threshold dose of morphine required for conditioned place preference.
- Estradiol possesses intrinsic rewarding properties.
