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- W2156153392 abstract "s: The aim of this study was to characterise the causes of differential HypothalamicPituitary-Adrenal (HPA) axis functioning following constraint resulting from a genetic selection for a behavioural trait (Hazard et al., 2005). Japanese quails from two divergent lines selected for long (LTI) or short (STI) duration of tonic immobility (TI) have been used (Faure and Mills, 1971) at the age of 6 weeks. Adrenal and pituitary function were investigated by measuring changes in corticosterone (B) in response to pharmacological challenges (1-24 ACTH, CRF and AVT respectively). Quail were bled by decapitation. B values were subjected to a multifactorial ANOVA and Fisher test (PLSD) post hoc tests if appropriate (ANOVA: P < 0.05). In order to use the homologous and/or adequate peptides, the nucleotide acid sequences of quail ACTH, CRF and AVT have been determined. Adrenal sensitivity appeared comparable for LTI and STI genotypes since injection of 1-24 ACTH at doses ranging between 1.25 to 10μg/kg B.W. increased significantly B levels in a similar dose-response manner in both genotypes and sexes. Large and comparable B responses to those induced with 1-24 ACTH injection (100μg/kg B.W.) were measured following injection of AVT (10 or 50μg/kg B.W.). On the other hand, CRF injection (100μg/kg B.W.) induced lower B responses than 1-24 ACTH or AVT, and lower or comparable than following a 10min restraint in a crush cage. AVT was then much more potent than CRF in stimulating B release in these quail models. On the other hand, the present results did not show large difference in the physiological functioning of adrenal and pituitary glands between the two genotypes. Therefore, based on this results and complementary ones, it is likely that the major differences observed between LTI and STI genotypes in their HPA axis reactivity to acute stress, i.e. restraint in a crush cage (Hazard et al., 2005), involve differences in psychobiological processes of perception and integration; an hypothesis that will need the use of other scientific approaches to be investigated. On the other hand, the respective roles of CRF and AVT in the regulation of HPA axis responsiveness also need to be further elucidated in bird species." @default.
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- W2156153392 date "2006-01-01" @default.
- W2156153392 modified "2023-09-24" @default.
- W2156153392 title "Characterisation of quail CRF, AVT and ACTH cDNA and effects of the corresponding peptides on corticosterone levels in Japanese quail divergently selected for tonic immobility." @default.
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