Abstract：
:Animals living in temperate climates with predictable seasonal changes in food availability may use seasonal information to engage different metabolic strategies. Siberian hamsters decrease costs of thermoregulation during winter by reducing food intake and body mass in response to decreasing or short-day lengths (SD). These experiments examined whether SD reduction in food intake in hamsters is driven, at least in part, by altered behavioral responses to ghrelin, a gut-derived orexigenic peptide which induces food intake via NPY-dependent mechanisms. Relative to hamsters housed in long-day (LD) photoperiods, SD hamsters consumed less food in response to i.p. treatment with ghrelin across a range of doses from 0.03 to 3 mg/kg. To determine whether changes in photoperiod alter behavioral responses to ghrelin-induced activation of NPY neurons, c-Fos and NPY expression were quantified in the arcuate nucleus (ARC) via double-label fluorescent immunocytochemistry following i.p. treatment with 0.3 mg/kg ghrelin or saline. Ghrelin induced c-Fos immunoreactivity (-ir) in a greater proportion of NPY-ir neurons of LD relative to SD hamsters. In addition, following ghrelin treatment, a greater proportion of ARC c-Fos-ir neurons were identifiable as NPY-ir in LD relative to SD hamsters. Changes in day length markedly alter the behavioral response to ghrelin. The data also identify photoperiod-induced changes in the ability of ghrelin to activate ARC NPY neurons as a possible mechanism by which changes in day length alter food intake.
journal_name
Horm Behavjournal_title
Hormones and behaviorauthors
Bradley SP,Pattullo LM,Patel PN,Prendergast BJdoi
10.1016/j.yhbeh.2010.06.009subject
Has Abstractpub_date
2010-09-01 00:00:00pages
647-52issue
4eissn
0018-506Xissn
1095-6867pii
S0018-506X(10)00169-8journal_volume
58pub_type
杂志文章abstract：:Aggressive encounters are accompanied by a release of stress hormone, and this corticosterone (CORT) secretion could influence aggressive behavior in subsequent encounters. We investigated the modulating effects of CORT on aggressive behavior in the context of a 5-day social experience in male green anole lizards. In ...
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
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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
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journal_title：Hormones and behavior
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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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abstract：:The effects of marijuana's major psychoactive cannabinoid, ∆9-tetrahydrocannibinol (∆9-THC), were examined on memory in female rats by training subjects to respond under a repeated acquisition and delayed-performance procedure. During this task, subjects acquired a different 4-response sequence each session, which was...
journal_title：Hormones and behavior
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