Involvement of Drinking and Intestinal Sodium Absorption in Hyponatremic Effect of Atrial Natriuretic Peptide in Seawater Eels(Endocrinology)
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概要
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Atrial natriuretic peptide (ANP) decreases plasma Na^+ concentration and promtes seawater (SW) adaptation in eels. The hyponatremia may most probably be caused by increased branchial extrusion of Na^+, but the mechanism has not been determined yet. The present study examined initially the effects of ANP on branchial Na^+ efflux in vivo using isotopic ^<22>Na. however, the efflux rate was not altered by infusion of a hyponatremic does to ANP (5 pmol・kg^<-1>-min^<-1>). Therefore, we sought to examine whether the ANP-mediated hyponatremia is caused by a decrease in the uptake of Na^+ from the environment. Since a decrease in drinking was highly correlated with a degree of hyponatremia, conscious SW eels were infused with dilute SW into the stomach at a normal drinking rate to offset the antidipsogenic effect of ANP. Under this regimen, the hyponatremic effect of ANP was abolished. Then, we examined the site of Na^+ absorption in the alimentary tract by measuring the changes in ion composition of intraluminal fluid along the tract. Since Na^+ was absorbed at the esophagus and anterior/middle intestine, a sac was prepared at each site and the effects of ANP were examined in situ in conscious SW eels. ANP infusion did not alter Na^+ absorption at the esophagus, but it profoundly reduced the absorption at the intestine. Together with our previous finding that ANP does not alter renal Na^+ excretion, we propose that ANP reduces plasma Na^+ concentration in SW eels by inhibiting drinking and subsequent absorption of Na^+ by the intestine.
- 社団法人日本動物学会の論文
- 2005-01-25
著者
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Takei Yoshio
Ocean Research Institute, The University of Tokyo
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Tsukada Takehiro
Ocean Research Institute The University Of Tokyo
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Rankin J.
Department Of Chemistry And Biology Huddersfield University
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Takei Yoshio
Ocean Research Institute The University Of Tokyo
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