Rapid Effects of Aggressive Interactions on Aromatase Activity and Oestradiol in Discrete Brain Regions of Wild Male White-Crowned Sparrows

被引:63
作者
Charlier, T. D. [1 ,3 ]
Newman, A. E. M. [2 ,3 ]
Heimovics, S. A. [3 ]
Po, K. W. L. [3 ]
Saldanha, C. J. [4 ]
Soma, K. K. [2 ,3 ,5 ]
机构
[1] Univ Liege, GIGA Neurosci, B-4000 Liege, Belgium
[2] Univ British Columbia, Grad Program Neurosci, Vancouver, BC V5Z 1M9, Canada
[3] Univ British Columbia, Dept Psychol, Vancouver, BC V5Z 1M9, Canada
[4] Lehigh Univ, Bethlehem, PA 18015 USA
[5] Univ British Columbia, Dept Zool, Vancouver, BC V5Z 1M9, Canada
基金
加拿大健康研究院; 加拿大创新基金会;
关键词
estradiol; estrogens; songbird; aggression; hippocampus; ESTROGEN-RECEPTOR-ALPHA; MESSENGER-RNA; TERRITORIAL AGGRESSION; SEX-DIFFERENCES; IMMUNOREACTIVE CELLS; METABOLIZING ENZYMES; ANDROGEN RECEPTOR; STEROID-HORMONES; SOCIAL-BEHAVIOR; MICE LACKING;
D O I
10.1111/j.1365-2826.2011.02170.x
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Testosterone is critical for the activation of aggressive behaviours. In many vertebrate species, circulating testosterone levels rapidly increase after aggressive encounters during the early or mid-breeding season. During the late breeding season, circulating testosterone concentrations did not change in wild male white-crowned sparrows after an aggressive encounter and, in these animals, changes in local neural metabolism of testosterone might be more important than changes in systemic testosterone levels. Local neural aromatisation of testosterone into 17 beta-oestradiol (E-2) often mediates the actions of testosterone, and we hypothesised that, in the late breeding season, brain aromatase is rapidly modulated after aggressive interactions, leading to changes in local concentrations of E-2. In the present study, wild male white-crowned sparrows in the late breeding season were exposed to simulated territorial intrusion (STI) (song playback and live decoy) or control (CON) for 30 min. STI significantly increased aggressive behaviours. Using the Palkovits punch technique, 13 brain regions were collected. There was high aromatase activity in several nuclei, although enzymatic activity in the CON and STI groups did not differ in any region. E-2 concentrations were much higher in the brain than the plasma. STI did not affect circulating levels of E-2 but rapidly reduced E-2 concentrations in the hippocampus, ventromedial nucleus of the hypothalamus and bed nucleus of the stria terminalis. Unexpectedly, there were no correlations between aromatase activity and E-2 concentrations in the brain, nor were aromatase activity or brain E-2 correlated with aggressive behaviour or plasma hormone levels. This is one of the first studies to measure E-2 in microdissected brain regions, and the first study to do so in free-ranging animals. These data demonstrate that social interactions have rapid effects on local E-2 concentrations in specific brain regions.
引用
收藏
页码:742 / 753
页数:12
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