Tubular sites of potassium regulation in the normal and uninephrectomized rat.

H. H. Bengele, Andrew Evan, E. R. McNamara, E. A. Alexander

Research output: Contribution to journalArticle

Abstract

Tubular handling of potassium was studied in the Charles River CD (cesarean derived) rat by clearance, micropuncture, and anatomic techniques. The following groups were evaluated: group I, hydropenia; group II, KCl-mannitol infusion; group III, 10% body wt saline loading; group IV, uninephrectomy, hydropenia; and group V, uninephrectomy, saline loading. Comparison of micropuncture samples from early and late distal collection sites (LDCS) and urine collections revealed no net K transport along the distal convoluted tubule in groups I and III-V but net addition of K in all groups beyond the LDCS. Absolute K secretion beyond the LDCS appeared to be flow dependent in groups I-III. The LDCS was noted by light and electron microscopy always to be lined with collecting tubule epithelium. We conclude that no net change in potassium transport occurs along the superficial distal convoluted tubule during hydropenia or saline loading in normal or uninephrectomized Charles River CD rats, but secretion is demonstrable during KCl infusion. Net addition of potassium beyond the LDCS was noted in all groups and this addition was enhanced by uninephrectomy.

Original languageEnglish
JournalThe American journal of physiology
Volume234
Issue number2
StatePublished - Feb 1978
Externally publishedYes

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Potassium
Punctures
Rivers
Urine Specimen Collection
Mannitol
Electron Microscopy
Epithelium
Light
III-10

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Tubular sites of potassium regulation in the normal and uninephrectomized rat. / Bengele, H. H.; Evan, Andrew; McNamara, E. R.; Alexander, E. A.

In: The American journal of physiology, Vol. 234, No. 2, 02.1978.

Research output: Contribution to journalArticle

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