Thapsigargin discharges intracellular calcium stores and induces transmembrane currents in human endothelial cells.
We have measured the effects of thapsigargin, a specific inhibitor of endoplasmic Ca(2+)-adenosine 5'-triphosphatase (Ca(2+)-ATPase), on membrane currents and on the intracellular Ca2+ concentration ([Ca2+]i) in single endothelial cells from the human umbilical cord vein. Currents were recorded by means of the patch-clamp technique in the whole-cell mode and [Ca2+]i was measured using Fura II. Application of thapsigargin at concentrations between 0.2 and 2 mumol/l induced a slow increase in [Ca2+]i to a peak value of 400 +/- 110 nmol/l above a resting level of 120 +/- 35 nmol/l, and then slowly declined to a new steady-state level of 315 +/- 90 nmol/l (n = 33). The thapsigargin-induced increase in [Ca2+]i depended on the extracellular Ca2+ concentration ([Ca2+]o: it declined after removal of extracellular Ca2+, but increased again when [Ca2+]o was augmented, indicating that the response depends on a transmembrane influx of Ca2+ ions. The peak amplitude of the histamine-induced Ca2+ transient was reduced in the presence of thapsigargin. This reduction was more pronounced when histamine was applied at the peak of the increase in [Ca2+]i induced by thapsigargin than during the rising phase of the changes in [Ca2+]i. The decline of the Ca2+ transient induced by histamine after washing out the agonist was also affected by thapsigargin. Before application of thapsigargin, this decline could be described by a single exponential with a time constant tau equal to 24.5 +/- 5 s (n = 7).(ABSTRACT TRUNCATED AT 250 WORDS)
Gericke
M
M
Max Planck Group, Molecular and Cellular Physiology, Leuven, Belgium.
Droogmans
G
G
Nilius
B
B
D002118:Calcium / Q000378:metabolism*; D000252:Calcium-Transporting ATPases / Q000037:antagonists & inhibitors*; D002462:Cell Membrane / Q000187:drug effects / Q000502:physiology*; D004553:Electric Conductivity; D004730:Endothelium, Vascular / Q000187:drug effects / Q000502:physiology*; D006632:Histamine / Q000494:pharmacology; D006801:Humans; D008564:Membrane Potentials / Q000187:drug effects; D013729:Terpenes / Q000494:pharmacology*; D019284:Thapsigargin; D014471:Umbilical Veins
D013729:Terpenes; D019284:Thapsigargin; D006632:Histamine; D000252:Calcium-Transporting ATPases; D002118:Calcium