Center for Comparative NeuroImaging
Animals; Cerebrovascular Circulation; Cocaine; Estradiol; Female; Hippocampus; Hypercapnia; Magnetic Resonance Imaging; Nucleus Accumbens; Ovariectomy; Oxygen; Rats; Rats, Sprague-Dawley; Sex Characteristics; Tegmentum Mesencephali
Life Sciences | Medicine and Health Sciences
We investigated the effect of estrogen on cocaine-induced brain activity using blood oxygen level-dependent (BOLD) magnetic resonance imaging. Ovariectomized (Ovx) rats without estrogen and Ovx rats with estrogen (Ovx+E) were given a single saline or cocaine injection (15 mg/kg, i.p.) for 5 d. After 7 d of withdrawal from injections, rats were challenged with cocaine during functional imaging. Acute cocaine administration produced positive BOLD activation in the prefrontal cortex, nucleus accumbens, striatum, ventral tegmental area, and hippocampus, among other brain regions. Positive BOLD signal changes were lower in Ovx+E than in Ovx rats. With repeated cocaine administration, Ovx+E rats showed enhanced BOLD signal changes in the nucleus accumbens, ventral tegmental area, and hippocampus compared with acutely treated animals. Our results indicate that estrogen influences the effects of acute and repeated cocaine administration on BOLD signal changes. The data suggest that in females with estrogen, cocaine-induced neuronal activity is enhanced after repeated cocaine administration. It is possible that the actions of estrogen within the aforementioned brain regions potentiate the behavioral response to cocaine observed in female rats.
DOI of Published Version
J Neurosci. 2005 Feb 2;25(5):1132-6. Link to article on publisher's site
The Journal of neuroscience : the official journal of the Society for Neuroscience
Febo, Marcelo; Ferris, Craig F.; and Segarra, Annabell C., "Estrogen influences cocaine-induced blood oxygen level-dependent signal changes in female rats" (2005). Open Access Articles. 1169.