The activation of the HPA axis is the endocrine measure of stress responsiveness that is initiated by corticotropin-releasing hormone (CRH). CRH exerts its effects via CRHR1 and CRH-R2 receptors coupled to the cAMP signaling system and this process involves transcription factor cAMP-responsive element-binding protein (CREB).This study investigated the role of CRH and the possible involvement of CREB in gene regulation of CRH receptor, under basal conditions and after stress application in the pituitary. We used wild type (wt +/+) controls and CRH knock-out (CRH-KO -/-) male mice. Using CRH-deficient mice, we were able to investigate the consequences of the lack of the CRH on the expression of CRH receptors and transcriptional regulation mediated by CREB. We estimated the effect of acute (IMO 1×) and repeated (IMO 7×) restraint stressors lasting 30 and 120 min on the expression of mRNA CREB, CRH-R1, and CRH-R2 by qPCR. We found very significant difference in the expression of these peptides under the effect of single and repeated stress in control and CRH-KO mice. Our results indicate that both CRH receptors and CREB might be involved in the regulation of stress response in the pituitary of mice. We propose that regulation of the stress response may be better understood if more were known about the mechanisms of CRH receptor signal transduction and involvement of CREB system.

• Klíčová slova
• Acute stress, CREB, CRH, CRH knock-out mice, CRH receptors, Repeated stress,
• MeSH
• akutní nemoc MeSH
• hormon uvolňující kortikotropin biosyntéza   nedostatek   MeSH
• hypofýza metabolismus   MeSH
• myši inbrední C57BL MeSH
• myši knockoutované MeSH
• myši MeSH
• protein vázající cAMP responzivní element biosyntéza   MeSH
• psychický stres metabolismus   psychologie   MeSH
• receptor CRF typu 1 MeSH
• receptory hormonu uvolňujícího kortikotropin biosyntéza   MeSH
• zvířata MeSH
• Check Tag
• mužské pohlaví MeSH
• myši MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• Názvy látek
• Creb1 protein, mouse MeSH Prohlížeč
• CRF receptor type 2 MeSH Prohlížeč
• hormon uvolňující kortikotropin MeSH
• protein vázající cAMP responzivní element MeSH
• receptor CRF typu 1 MeSH
• receptory hormonu uvolňujícího kortikotropin MeSH