BK channels and a new form of hypertension

  • Grimm P
  • Sansom S
  • 37

    Readers

    Mendeley users who have this article in their library.
  • 27

    Citations

    Citations of this article.

Abstract

Large, Ca-activated K channels (BK) are comprised of an α pore (BKα) and one of four β subunits (BKβ1-4). When the gene for BKβ1 is knocked out (BKβ1-KO), the result is increased myogenic tone of vascular smooth muscle and hypertension. We reexamined whether the hypertension is entirely due to increased vascular tone, because most monogenic forms of hypertension have renal origins and BKβ1 resides in renal connecting tubule (CNT) cells. Moreover, BKβ1 is localized in the adrenal glands, where it may control production of aldosterone. This review will summarize our report that a majority of the hypertension of BKβ1-KO is the result of insufficient handling of dietary K, resulting in increased plasma K and hyperaldosteronism, the latter promoting Na and fluid retention. The fluid retention and hypertension are exacerbated by a high-K diet and reduced by eplerenone, an aldosterone receptor inhibitor. Genetic knockout of BKβ4 (BKβ4-KO), which resides in intercalated cells, also exhibits deficient K excretion, fluid retention, and mild hypertension that is not exacerbated when animals are treated with a high-K diet. These results show that the hypertension associated with BKβ1-KO occurs because of enhanced fluid retention, as well as because of the previously described vascular dysfunction.

Author-supplied keywords

  • K channels
  • collecting ducts
  • distal tubule
  • diuretics
  • hypertension

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Get full text

Authors

  • P. Richard Grimm

  • Steven C. Sansom

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free