Abstract:
:In euryhaline fishes, atrial and B-type natriuretic peptides are important hormones in hypo-osmoregulation, whereas osmoregulatory functions of C-type natriuretic peptides (CNPs) remain to be investigated. Although four CNP isoforms (CNP1-4) are mainly expressed in the brain, multiorgan expression of CNP3 was found in euryhaline Japanese eel, Anguilla japonica. Here we identified the CNP3-expressing cells and examined their response to osmotic stress in eel. CNP3 was expressed in several endocrine cells: prolactin-producing cells (pituitary), glucagon-producing cells (pancreas), and cardiomyocytes (heart). Pituitary CNP3 expression was the highest among organs and was decreased following seawater transfer, followed by a decrease in the freshwater-adaptating (hyper-osmoregulatory) hormone prolactin. We also showed the negative correlation between CNP3/prolactin expression in the pituitary and plasma Cl- concentration, but not for plasma Na+ concentration. These results suggest that CNP3 in the pituitary (and pancreas) plays a critical role in freshwater adaptation of euryhaline eel together with prolactin.
journal_name
Mol Cell Endocrinoljournal_title
Molecular and cellular endocrinologyauthors
Katayama Y,Wong MK,Kusakabe M,Fujio M,Takahashi N,Yaguchi M,Tsukada Tdoi
10.1016/j.mce.2020.110780subject
Has Abstractpub_date
2020-05-01 00:00:00pages
110780eissn
0303-7207issn
1872-8057pii
S0303-7207(20)30080-0journal_volume
507pub_type
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