Rabbit distal convoluted tubule coexpresses NaCl cotransporter and 11β- hydroxysteroid dehydrogenase II mRNA

Heino Velázquez, Aniko Náray-Fejes-Tóth, Teresa Silva, Eleanor Andújar, Robert F. Reilly, Gary V. Desir, David Ellison

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Background. Although the renal cortical collecting duct (CCD) is a principal target for aldosterone, recent evidence suggests that salt transport by other nephron segments may also be regulated by aldosterone. Electroneutral and thiazide-sensitive NaCl cottansport by the distal convoluted tubule (DCT) of the rat is increased in animals deprived of dietary NaCl. We tested the hypothesis that the DCT of the rabbit is an aldosterone target tissue. Methods. The single-nephron reverse- transcriptase/polymerase chain reaction (RT-PCR) technique was used to determine mRNA expression of NaCl cotransporter and 11β-HSD 2 in dissected nephron segments. The rabbit NaCl cotransporter was first cloned and rabbit- specific primers selected. A micro-assay was developed to assess 11β-HSD 2 enzyme activity in0.5 mm samples of the same nephron segments. Results. NaCl cotransporter was expressed in 0 of 6 proximal tubule (PT), 6 of 6 DCT and 3 of 6 CCD samples, while 11β-HSD was found in 0 of 7 PT, 7 of 7 DCT and 9 of 9 CCD samples. Corticosterone was converted to 11-dehydrocorticosterone at a high rate and to a similar extent by both the DCT and CCD, but not the PT. Conclusions. We conclude that the DCT is a target tissue for the action of aldosterone. Axial heterogeneity of electroneutral (in DCT) and electrogenic (in CCD) Na transporters along the distal nephron may improve sodium recovery in low salt and volume states.

Original languageEnglish (US)
Pages (from-to)464-472
Number of pages9
JournalKidney International
Volume54
Issue number2
DOIs
StatePublished - 1998
Externally publishedYes

Fingerprint

11-beta-Hydroxysteroid Dehydrogenases
Nephrons
Aldosterone
Rabbits
Messenger RNA
Salts
Thiazides
Corticosterone
Reverse Transcriptase Polymerase Chain Reaction
Sodium
Kidney
Enzymes

Keywords

  • Aldosterone
  • Hypertension
  • Licorice
  • Thiazide
  • Volume

ASJC Scopus subject areas

  • Nephrology

Cite this

Rabbit distal convoluted tubule coexpresses NaCl cotransporter and 11β- hydroxysteroid dehydrogenase II mRNA. / Velázquez, Heino; Náray-Fejes-Tóth, Aniko; Silva, Teresa; Andújar, Eleanor; Reilly, Robert F.; Desir, Gary V.; Ellison, David.

In: Kidney International, Vol. 54, No. 2, 1998, p. 464-472.

Research output: Contribution to journalArticle

Velázquez, Heino ; Náray-Fejes-Tóth, Aniko ; Silva, Teresa ; Andújar, Eleanor ; Reilly, Robert F. ; Desir, Gary V. ; Ellison, David. / Rabbit distal convoluted tubule coexpresses NaCl cotransporter and 11β- hydroxysteroid dehydrogenase II mRNA. In: Kidney International. 1998 ; Vol. 54, No. 2. pp. 464-472.
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AU - Andújar, Eleanor

AU - Reilly, Robert F.

AU - Desir, Gary V.

AU - Ellison, David

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