title: [Corticoliberin fragment CRF4-6 modifies rat behavior in opposite ways under stressing and non-stressing conditions].
abstract: The effects of tripeptide corticoliberin fragment CRF4-6 (icv; 6, 30, and 150 nmol/head) on behaviour of rats were investigated under non-stressing and stressing conditions. CRF4-6 activated rat behaviour under non-stressing conditions (home cage): the duration of locomotion and exploratory behaviour was increased whereas the duration of passive behaviour and sleep was decreased. On the other hand, CRF4-6 suppressed the rat exploratory behaviour under stressing conditions (elevated plus-maze): the duration of non-exploratory behaviour was increased; numbers of rearings and leanings out to open arms were reduced. All observed effects of the tripeptide CRF4-6 were dose-dependent. Behavioural effects of the tripeptide were similar to the well-known action of the whole corticoliberin molecule. Therefore we suggest that CRF4-6 is located in the active part of CRF or it can be a physiologically active corticoliberin derivative.
authors: E Iu
authors: EIu
authors: Makarenko
authors: D V
authors: DV
authors: Tsvirkun
authors: L A
authors: LA
authors: Andreeva
authors: A A
authors: AA
authors: Martt'ianov
mesh_terms: D000818:Animals; D001007:Anxiety / Q000209:etiology / Q000523:psychology; D001522:Behavior, Animal / Q000187:drug effects*; D003346:Corticotropin-Releasing Hormone / Q000008:administration & dosage / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D008297:Male; D018782:Maze Learning / Q000187:drug effects; D009043:Motor Activity / Q000187:drug effects; D010446:Peptide Fragments / Q000008:administration & dosage / Q000494:pharmacology*; D051381:Rats; D013315:Stress, Psychological / Q000150:complications / Q000523:psychology*
chemical_list: D010446:Peptide Fragments; C488808:prolyl-prolylisoleucine; D003346:Corticotropin-Releasing Hormone