TY - JOUR
T1 - Regulation of Branchial Anoctamin 1 Expression in Freshwater- and Seawater-Acclimated Japanese Medaka, Oryzias latipes
AU - Konno, Norifumi
AU - Togashi, Ayane
AU - Miyanishi, Hiroshi
AU - Azuma, Morio
AU - Nakamachi, Tomoya
AU - Matsuda, Kouhei
N1 - Publisher Copyright:
© 2024 Wiley Periodicals LLC.
PY - 2024
Y1 - 2024
N2 - In euryhaline teleosts, the cystic fibrosis transmembrane conductance regulator (CFTR) in seawater (SW)-type chloride cells facilitates apical Cl− secretion for SW adaptation, while alternative Cl− excretion pathways remain understudied. This study investigates the role of the calcium-activated chloride channel, Anoctamin 1 (ANO1), in the gills of the euryhaline Japanese medaka (Oryzias latipes) under hyperosmolality and cortisol (CORT) influence. Acclimation to artificial SW, NaCl, mannitol, or glucose significantly upregulated ANO1 and CFTR mRNA expression in gills, unlike urea treatment. In situ hybridization revealed ANO1 mRNA in chloride cells co-expressing CFTR and Na+, K+-ATPase under hyperosmotic conditions. ANO1 inhibition elevated plasma Cl− concentration, indicating impaired Cl− excretion. CORT or dexamethasone administration in freshwater (FW) fish significantly increased branchial ANO1 and CFTR mRNA expression, an effect attenuated by the glucocorticoid receptor (GR) antagonist RU486. Hyperosmotic treatment of isolated gill tissues rapidly induced ANO1 mRNA expression independent of CFTR mRNA changes, and this induction was unaffected by RU486. These findings highlight the dual regulation of ANO1 expression via hyperosmolality-induced cellular response and the CORT–GR system. Thus, branchial ANO1 may likely complement CFTR in Cl⁻ excretion, playing a key role in the hyperosmotic adaptation of euryhaline teleosts.
AB - In euryhaline teleosts, the cystic fibrosis transmembrane conductance regulator (CFTR) in seawater (SW)-type chloride cells facilitates apical Cl− secretion for SW adaptation, while alternative Cl− excretion pathways remain understudied. This study investigates the role of the calcium-activated chloride channel, Anoctamin 1 (ANO1), in the gills of the euryhaline Japanese medaka (Oryzias latipes) under hyperosmolality and cortisol (CORT) influence. Acclimation to artificial SW, NaCl, mannitol, or glucose significantly upregulated ANO1 and CFTR mRNA expression in gills, unlike urea treatment. In situ hybridization revealed ANO1 mRNA in chloride cells co-expressing CFTR and Na+, K+-ATPase under hyperosmotic conditions. ANO1 inhibition elevated plasma Cl− concentration, indicating impaired Cl− excretion. CORT or dexamethasone administration in freshwater (FW) fish significantly increased branchial ANO1 and CFTR mRNA expression, an effect attenuated by the glucocorticoid receptor (GR) antagonist RU486. Hyperosmotic treatment of isolated gill tissues rapidly induced ANO1 mRNA expression independent of CFTR mRNA changes, and this induction was unaffected by RU486. These findings highlight the dual regulation of ANO1 expression via hyperosmolality-induced cellular response and the CORT–GR system. Thus, branchial ANO1 may likely complement CFTR in Cl⁻ excretion, playing a key role in the hyperosmotic adaptation of euryhaline teleosts.
KW - anoctamin 1
KW - calcium activated chloride channel
KW - chloride cell
KW - euryhaline fish
KW - osmoregulation
UR - http://www.scopus.com/inward/record.url?scp=85212831775&partnerID=8YFLogxK
U2 - 10.1002/jez.2894
DO - 10.1002/jez.2894
M3 - 学術論文
C2 - 39718083
AN - SCOPUS:85212831775
SN - 2471-5638
JO - Journal of Experimental Zoology Part A: Ecological and Integrative Physiology
JF - Journal of Experimental Zoology Part A: Ecological and Integrative Physiology
ER -