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Aldosterone increases the apical Na+ permeability of toad bladder by two different mechanisms.

Abstract：

:The aldosterone-induced augmentation of Na+ transport in toad bladder was analyzed by comparing the hormonal actions on the transepithelial short-circuit current and on the amiloride-sensitive 22Na+ uptake in isolated membrane vesicles. Incubating bladders with 0.5 microM aldosterone for 3 hr evoked more than a 2-fold increase of the short-circuit current (because of the activation or insertion of apical amiloride-blockable channels) but had no effect on the amiloride-sensitive Na+ transport in apical vesicles derived from the treated tissue. A longer incubation (e.g., 6 hr) produced an additional augmentation of the short-circuit current, which was accompanied by about a 3-fold increase of the channel activity in isolated membranes. The stimulatory effect of aldosterone sustained in vesicles was inhibited by the antagonist spironolactone (present at 1000-fold excess) and the protein synthesis inhibitor cycloheximide (1 microM). In addition, triiodothyronine and butyrate, previously reported to partly inhibit the aldosterone-induced increase in short-circuit current, blocked the hormonal effect in vesicles. It is suggested that aldosterone elevates the apical Na+ permeability of target epithelia by two different mechanisms: a relatively fast effect (less than or equal to 3 hr), which is insensitive to triiodothyronine or butyrate and is not sustained by the isolated membrane, and a slower or later (greater than 3 hr) response blocked by these reagents, which is preserved by the isolated membrane. The data also indicate that these processes are mediated by different nuclear receptors.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Asher C,Garty H

doi

10.1073/pnas.85.19.7413

subject

Has Abstract

pub_date

1988-10-01 00:00:00

pages

7413-7

issue

19

eissn

0027-8424

issn

1091-6490

journal_volume

85

pub_type

杂志文章

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