Abstract：
:The difference in visual object recognition by males and females suggests a sex-specific function in the medial prefrontal cortex (mPFC). In the present study, we performed an in vivo microdialysis study in three groups of rats (males, diestrous females, and proestrous females) to examine the potential sex difference in acetylcholine (ACh) release in the mPFC. The dialysate was automatically collected from the mPFC every 20 min for 24 h under freely moving conditions and the spontaneous locomotor activity was simultaneously monitored. Although ACh release in the mPFC during the dark phase was significantly greater than during the light phase in both sexes, the female rats consistently exhibited a significantly greater mean ACh release than the males. Spontaneous locomotor activity during the dark phase was also significantly greater than during the light phase in both sexes, but the females exhibited significantly greater spontaneous locomotor activity than the males. In addition, both sexes of rats were found to have significant positive correlations between ACh release and spontaneous locomotor activity, but females were found to have significantly greater correlation coefficients than males. Stereological methods were used to examine the number of choline acetyltransferase immunoreactive cells in the nucleus basalis magnocellularis and the horizontal diagonal band of Broca. The number of choline acetyltransferase immunoreactive cells in the nucleus basalis magnocellularis was also greater in females than males, suggesting a contribution to the higher ACh release in females. In contrast, no sex difference in the choline acetyltransferase immunoreactive cells was observed in the horizontal diagonal band of Broca. This is the first report to show a sex difference in the 24-h ACh release profile in the mPFC of behaving rats.
journal_name
Neurosciencejournal_title
Neuroscienceauthors
Takase K,Kimura F,Yagami T,Mitsushima Ddoi
10.1016/j.neuroscience.2008.12.039subject
Has Abstractpub_date
2009-03-03 00:00:00pages
7-15issue
1eissn
0306-4522issn
1873-7544pii
S0306-4522(08)01861-7journal_volume
159pub_type
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