Publication: Anxiety-like behaviors and expression of SERT and TPH in the dorsal raphé of estrogen- and fluoxetine-treated ovariectomized rats
Issued Date
2011-06-01
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00913057
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2-s2.0-79952994290
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Mahidol University
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SCOPUS
Bibliographic Citation
Pharmacology Biochemistry and Behavior. Vol.98, No.4 (2011), 503-510
Suggested Citation
Jantarima Charoenphandhu, Jarinthorn Teerapornpuntakit, Amporn Nuntapornsak, Nateetip Krishnamra, Narattaphol Charoenphandhu Anxiety-like behaviors and expression of SERT and TPH in the dorsal raphé of estrogen- and fluoxetine-treated ovariectomized rats. Pharmacology Biochemistry and Behavior. Vol.98, No.4 (2011), 503-510. doi:10.1016/j.pbb.2011.02.023 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/11545
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Title
Anxiety-like behaviors and expression of SERT and TPH in the dorsal raphé of estrogen- and fluoxetine-treated ovariectomized rats
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Abstract
The anxiolytic effect of fluoxetine (Flx) was often ineffective in postmenopausal and estrogen-deficient patients, but such effect had not been experimentally demonstrated, particularly in the female rat model of estrogen deficiency. Here we determined the anxiety-like behaviors in ovariectomized (Ovx) rats treated for 4 weeks with 10 μg/kg 17β-estradiol s.c. (Ovx + E2), 10 mg/kg Flx p.o. (Ovx + Flx) or a combination of both (Ovx + E2 + Flx). Since Flx is known to induce anxiolysis in males, we first evaluated the Flx regimen in male rats. The results showed that anxiety-like behaviors were reduced in Flx-treated male rats. In contrast, Ovx + Flx rats still exhibited the same anxiety-like behaviors as in Ovx rats. Both Ovx + E2 and Ovx + E2 + Flx rats, however, showed comparable reductions in anxiety-like behaviors, suggesting that Flx had no anxiolytic-like effect. Furthermore, E2 and E2 + Flx similarly upregulated the mRNA expression of serotonin reuptake transporter (SERT) and tryptophan hydroxylase-2 in the dorsal raphé of Ovx rats, while having no effect on SERT expression in the frontal cortex, hippocampus, septum, amygdala and periaqueductal gray. In conclusion, Flx induced anxiolytic-like action in male rats. In Ovx rats, it was E2 and not Flx that exerted the anxiolytic-like action, which was mediated, in part, by altering serotonin metabolism in the dorsal raphé. © 2010 Elsevier Inc. All rights reserved.