Abstract:
:The gonadal hormone testosterone (T) regulates aggression across a wide range of vertebrate species. Recent evidence suggests that the adrenal prohormone dehydroepiandrosterone (DHEA) may also play an important role in regulating aggression. DHEA can be converted into active sex steroids, such as T and estradiol (E(2)), within the brain. Previous studies show that circulating DHEA levels display diurnal rhythms and that melatonin increases adrenal DHEA secretion in vitro. Here we examined serum DHEA and T levels in long-day housed Siberian hamsters (Phodopus sungorus), a nocturnal species in which melatonin treatment increases aggression. In Experiment 1, serum DHEA and T levels were measured in adult male hamsters during the day (1200 h, noon) and night (2400 h, midnight). In Experiment 2, aggression was elicited using 5-min resident-intruder trials during the day (1800 h) and night (2000 h) (lights-off at 2000 h). Serum DHEA and T levels were measured 24 h before and immediately after aggressive encounters. In Experiment 1, there was no significant difference in serum DHEA or T levels between noon and midnight, although DHEA levels showed a trend to be lower at midnight. In Experiment 2, territorial aggression was greater during the night than the day. Moreover, at night, aggressive interactions rapidly decreased serum DHEA levels but increased serum T levels. In contrast, aggressive interactions during the day did not affect serum DHEA or T levels. These data suggest that nocturnal aggressive encounters rapidly increase conversion of DHEA to T and that melatonin may play a permissive role in this process.
journal_name
Horm Behavjournal_title
Hormones and behaviorauthors
Scotti MA,Schmidt KL,Newman AE,Bonu T,Soma KK,Demas GEdoi
10.1016/j.yhbeh.2009.07.004subject
Has Abstractpub_date
2009-10-01 00:00:00pages
376-81issue
4eissn
0018-506Xissn
1095-6867pii
S0018-506X(09)00159-7journal_volume
56pub_type
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journal_title:Hormones and behavior
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journal_title:Hormones and behavior
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journal_title:Hormones and behavior
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journal_title:Hormones and behavior
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journal_title:Hormones and behavior
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journal_title:Hormones and behavior
pub_type: 杂志文章,评审
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更新日期:2014-06-01 00:00:00
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journal_title:Hormones and behavior
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journal_title:Hormones and behavior
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journal_title:Hormones and behavior
pub_type: 杂志文章
doi:10.1016/j.yhbeh.2018.11.007
更新日期:2019-01-01 00:00:00
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journal_title:Hormones and behavior
pub_type: 杂志文章
doi:10.1016/j.yhbeh.2008.03.001
更新日期:2008-09-01 00:00:00
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journal_title:Hormones and behavior
pub_type: 杂志文章
doi:10.1016/j.yhbeh.2004.11.010
更新日期:2005-03-01 00:00:00
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journal_title:Hormones and behavior
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journal_title:Hormones and behavior
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journal_title:Hormones and behavior
pub_type: 杂志文章,评审
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journal_title:Hormones and behavior
pub_type: 杂志文章
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journal_title:Hormones and behavior
pub_type: 杂志文章
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journal_title:Hormones and behavior
pub_type: 杂志文章
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journal_title:Hormones and behavior
pub_type: 杂志文章
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journal_title:Hormones and behavior
pub_type: 杂志文章
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更新日期:1996-12-01 00:00:00
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journal_title:Hormones and behavior
pub_type: 杂志文章,评审
doi:10.1016/j.yhbeh.2008.04.004
更新日期:2008-08-01 00:00:00
abstract::From the U.S. to Europe and Australia anabolic steroid abuse remains high in the adolescent population. This is concerning given that anabolic steroid use is associated with a higher incidence of pathological anxiety that often appears during withdrawal from use. This study uses pubertal Syrian hamsters (Mesocricetus ...
journal_title:Hormones and behavior
pub_type: 杂志文章
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