The action of the ionophores, X-537A and A-23187, on smooth muscle Academic Article uri icon


MeSH Major

  • Anti-Bacterial Agents
  • Calcimycin
  • Lasalocid
  • Muscle, Smooth


  • The cation ionophore X-537A in the concentration range of 10(-6) to 3 X 10(-5) M produced contractions in the rat and guinea-pig vas deferens. No contractile effect was produced in either of the vasa deferentia preparations by the ionophore A-23187 in the concentration range of 10(-7) to 5 X 10(-5) M. In contrast, X-537A had no contractile effect on the guinea-pig ileal longitudinal smooth muscle while A-23187 produced a dose and [Ca2+] dependent contraction. The contractile effect of X-537A in the vasa deferentia preparations is abolished by phenoxybenzamine or prior reserpine treatment and is therefore attributed to the release of norepinephrine. The effect of A-23187 in the intestinal smooth muslce is attributed to a direct Ca2+ transporting action since its contractile effect is unaffected by histamine, acetylcholine, or 5-hydroxytryptamine antagonists.

publication date

  • December 1975



  • Academic Article



  • eng

PubMed ID

  • 769924

Additional Document Info

start page

  • 1108

end page

  • 14


  • 53


  • 6