TonEBP regulates hyperosmolality-induced arginine vasotocin gene expression in the chick (Gallus domesticus).
Arginine vasotocin (AVT) is expressed mainly in the paraventircular and supraoptic nuclei of the hypothalamus in chicken. This peptide is known to act as an antidiuretic hormone and its gene expression is stimulated by hyperosmolality. However, the transcription factors that regulate the AVT gene expression induced by hyperosmolality are still unknown. In this study, we examined the role of hyper-tonicity enhancer binding protein (TonEBP) in the transcriptional regulation of AVT gene in chicken. TonEBP mRNA expression levels increased at 1h after salt-loading treatment in the hypothalamus. This increase preceded that in AVT and c-fos mRNA expression. Intracerebroventricular injections of TonEBP antisense oligonucleotides, before the salt-loading treatment, prevented the increase in AVT gene expression. These results, all together, suggest that the transcription factor TonEBP may be involved in the regulation of AVT genes expression in response to a hyperosmotic environment in chicken.
Saito
Noboru
N
Laboratory of Animal Physiology, Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan. nsaito@agr.nagoya-u.ac.jp
Fujii
Mariko
M
Sugiura
Kanae
K
Aste
Nicoletta
N
Shimada
Kiyoshi
K
D000595:Amino Acid Sequence; D000818:Animals; D002645:Chickens; D007031:Hypothalamus / Q000378:metabolism; D007276:Injections, Intraventricular; D008297:Male; D008969:Molecular Sequence Data; D050778:NFATC Transcription Factors / Q000235:genetics / Q000502:physiology*; D016376:Oligonucleotides, Antisense / Q000494:pharmacology; D009928:Organ Specificity; D009994:Osmolar Concentration; D012333:RNA, Messenger / Q000096:biosynthesis; D012965:Sodium Chloride / Q000097:blood; D014668:Vasotocin / Q000096:biosynthesis* / Q000235:genetics
D050778:NFATC Transcription Factors; D016376:Oligonucleotides, Antisense; D012333:RNA, Messenger; D012965:Sodium Chloride; D014668:Vasotocin