Nongenomic Effects of Androstenedione on Human Granulosa Luteinizing Cells
Véronique Machelon,
Françoise Nomé and
Jan Tesarik
INSERM, U-355, Institut Paris-Sud sur les Cytokines (V.M., F.N.),
92140 Clamart; Laboratoire dEylau (J.T.), 75116 Paris,
France
Address all correspondence and requests for reprints to: Dr. Véronique Machelon, INSERM, U-355, Maturation Gamétique et Fécondation, 32 rue des Carnets, 92140 Clamart, France.
This study examines rapid (560 s) effects of androgenson the
cytosolic free Ca2+ concentration ([Ca2+]i)
in humangranulosa luteinizing cells. Cells were obtained from human
preovulatoryfollicles, and [Ca2+]i was measured with the
use of the Ca2+-responsivefluorescent dye fluo-3. Molar
concentrations between 100 pmol/Land 1 µmol/L androstenedione
increased [Ca2+]i within5 s after addition to
cells. This [Ca2+]i increase resultedfrom both
Ca2+ influx, as shown by the effects of
ethyleneglycol-bis-(ß-aminoethyl
ether)-N,N,N',N'-tetraacetic
acidand the voltage-dependent Ca2+ channel blocker
verapamil, andCa2+ mobilization from the endoplasmic
reticulum, as shown bythe effects of thapsigargin. Treatment with
pertussis toxinand U-73,122, a specific inhibitor of phospholipase C,
abolishedthe effects of androstenedione on [Ca2+]i.
Flutamide, a nuclearandrogen receptor antagonist, did not block the
increase in[Ca2+]i induced by androstenedione.
Testosterone (100 pmol/Lto 1 µmol/L) had no effect. This is the
first report showingthat androstenedione increases
[Ca2+]i in granulosa cells. Thesedata provide evidence
for the presence in granulosa cells ofa novel, short term mechanism of
androstenedione action involvingvoltage-dependent Ca2+
channels in the plasma membrane and phospholipaseC activation via a
pertussis toxin-sensitive G protein.
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