BK channels in the kidney

P. Richard Grimm, Steven C. Sansom

Research output: Contribution to journalReview articlepeer-review

36 Scopus citations


PURPOSE OF REVIEW: Large, BK (calcium-activated potassium) channels are now regarded as relevant players in many aspects of renal physiology, including potassium secretion. This review will highlight recent discoveries regarding the function and localization of BK in the kidney. RECENT FINDINGS: Patch clamp electrophysiology has revealed BK in cultured podocytes, glomerular mesangial cells, and in several tubule segments including principal cells (connecting tubules/principal cells), and intercalated cells of connecting tubules and cortical collecting ducts. Flow-induced potassium secretion is mediated by BK in the distal nephron and may be partly the result of shear stress-induced increases in cell calcium concentrations. ROMK and wild-type mice on a high potassium diet exhibit BK-mediated potassium secretion, and studies of BK-α and BK-β1 mice suggest that flow-induced potassium secretion is mediated by BK-α/β1, which is specifically localized in the apical membrane of the connecting tubule of the mouse and connecting tubule plus initial cortical collecting duct of the rabbit. SUMMARY: BK channels, located in glomerular cells and in many nephron segments, especially mediate potassium secretion in the combined condition of potassium adaptation and high flow. Understanding the molecular makeup of BK in specific renal cells and the dietary and physiological conditions for their expression can yield improved potassium-sparing compounds.

Original languageEnglish (US)
Pages (from-to)430-436
Number of pages7
JournalCurrent opinion in nephrology and hypertension
Issue number5
StatePublished - Sep 2007


  • Beta subunits
  • Connecting tubule
  • Cyclic guanosine monophosphate-kinase
  • Maxi K
  • Mesangial cells

ASJC Scopus subject areas

  • Medicine(all)


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