PST2238: a new antihypertensive compound that antagonizes the long-term pressor effect of ouabain.

The inhibition of the long-term pressor effect of ouabain may be useful for the therapy of essential hypertension. Here, for the first time, a selective inhibitor of the ouabain pressor effect is described. In vitro, 17beta-(3-furyl)-5beta-androstane-3beta, 14beta, 17alpha-triol (PST 2238) displaced ouabain from its binding sites on purified sodium, potassium ATPase enzyme (Na-K ATPase) (IC50 1.7 x 10(-6) M) without interacting with other receptors involved in blood pressure regulation or hormonal control. In cultured renal cells, incubation with ouabain (10(-10) to 10(-8) M) for 5 days stimulated the Na-K pump at Vmax, whereas PST 2238 showed the same effect at micromolar concentration. The ouabain-dependent increase in the Na-K pump rate was abolished by PST 2238 at concentrations from 10(-14) to 10(-9) M. In rats made hypertensive by chronic infusion of 50 microg/kg/day of ouabain, PST 2238 given p.o at very low doses (0.1-1 microg/kg/day for 4 weeks) abolished the increase in blood pressure and renal Na-K ATPase activity caused by ouabain. PST 2238 did not affect either blood pressure or renal Na-K ATPase activity in normotensive rats. In conclusion, PST 2238 is a very potent compound that normalizes both blood pressure and alterations in the Na-K pump caused by ouabain. Thus it represents the prototype of a new class of antihypertensive drugs that could be effective in forms of hypertension sustained by the concomitant increase of endogenous ouabain levels and alterations in the Na-K pump.

• Publication year

  1998

• Venue

  Journal of Pharmacology and Experimental Therapeutics

• Publication date

  1998-04-01

• Fields of study

  Medicine, Chemistry

• Identifiers
  DOI 10.1016/s0022-3565(24)37374-4PMID 9535997
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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