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Multiple patterns of 11 beta-hydroxysteroid dehydrogenase catalytic activity along the mammalian nephron.

Abstract：

:The enzyme 11 beta-hydroxysteroid dehydrogenase (11 beta-OHSD) is thought to be a protective enzyme of the mineralocorticoid receptor (MR). We have previously demonstrated (Bonvalet et al, J Clin Invest 86:832-837, 1990) that 11 beta-OHSD is colocalized with MR along the rabbit nephron. In the present study, we examined whether 11 beta-OHSD is similarly located along the nephron of other mammals. Various tubular segments were microdissected from the mouse, rat, and rabbit nephron, and incubated for two hours at 37 degrees C in the presence of 11 nM [3H]-corticosterone (B). Thereafter, the respective amounts of B and [3H]-11dehydrocorticosterone (A) in the incubation solution were measured by HPLC. In the rabbit, the mouse and the rat, about 520 pmol/10 mm of B were transformed into A in tubular segments possessing MR, that is, the distal parts of the nephron (distal and collecting tubule). Differences appeared in the aldosterone-insensitive proximal tubule; in both the initial and final parts of this segment, 11 beta-OHSD activity was low (26 pmol/10 mm) in the rabbit and the mouse, and relatively high in the rat (328 pmol/10 mm). In the cortical part of the loop of Henle, where the presence of MR is still under discussion, 11 beta-OHSD activity was low in the mouse (70 pmol/10 mm), high in the rat (533 pmol/10 mm) and intermediate in the rabbit (227 pmol/10 mm). The comparison of these results with previous data obtained with immunohistochemical methods suggests that the proximal and distal nephron might express different isoforms of 11 beta-OHSD.

journal_name

Kidney Int

journal_title

Kidney international

authors

Kenouch S,Coutry N,Farman N,Bonvalet JP

doi

10.1038/ki.1992.260

subject

Has Abstract

pub_date

1992-07-01 00:00:00

pages

56-60

issue

1

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)57689-8

journal_volume

42

pub_type

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