Endothelin mediates Ca influx and release in porcine coronary smooth muscle cells

C. Wagner-Mann, Michael Sturek

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Endothelin (ET)-induced changes in intracellular free Ca (Ca(i)) in freshly dispersed coronary artery smooth muscle cells were determined using fura-2 microfluorometry to differentiate the action of ET on Ca influx vs. release from internal stores. Comparison was made with caffeine (CAF)-induced Ca release from the sarcoplasmic reticulum (SR) to determine whether ET acts on the same Ca store. In physiological external solution, ET (5 x 10-8 M) induced a rapid (within 90 s), transient (-4 M; n = 10) did not change the amplitude or shape of the ET-induced Ca(i) transient. In Ca-free solution, ET elicited a Ca(i) response similar in duration but smaller (P <0.05) in peak magnitude (31% increase; n = 7). CAF (5 x 10-3 M) also elicited a rapid (-5 M) suppressed the subsequent ET-induced Ca(i) transient. These data on porcine cells suggest ET induces a rapid release of Ca from a CAF- and ryanodine-sensitive store and causes rapid influx of Ca, which is different from bovine smooth muscle cells. The return of Ca(i) to baseline values in the continued presence of ET suggests the ET-sensitive store is depleted and increased Ca efflux matches Ca influx.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Cell Physiology
Volume260
Issue number4 29-4
StatePublished - 1991
Externally publishedYes

Fingerprint

Endothelins
Smooth Muscle Myocytes
Muscle
Swine
Cells
Caffeine
Cytophotometry
Ryanodine
Fura-2
Sarcoplasmic Reticulum
Coronary Vessels

Keywords

  • Caffeine
  • Diltiazem
  • Fura-2 microfluorometry
  • Ryanodine
  • Sarcoplasmic reticulum

ASJC Scopus subject areas

  • Clinical Biochemistry
  • Cell Biology
  • Physiology

Cite this

Endothelin mediates Ca influx and release in porcine coronary smooth muscle cells. / Wagner-Mann, C.; Sturek, Michael.

In: American Journal of Physiology - Cell Physiology, Vol. 260, No. 4 29-4, 1991.

Research output: Contribution to journalArticle

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