In vitro effects of Cetrorelix on LH-RH-R
expression and LH response in normal and OVX rat pituitary cells in the
superfusion system. (a) LH-RH-R mRNA and β-actin mRNA
expression of normal pituitary cells perfused continuously with 100 nM
Cetrorelix for 10 h. RT-PCR products are shown after separation by
agarose gel electrophoresis and staining with ethidium bromide. Lane M,
100-bp DNA molecular weight marker; lanes 1 and 2, Cetrorelix-treated;
lanes 3 and 4, untreated control cells. (b) LH responses
of normal rat pituitary cells to 1 nM LH-RH pulses (L) for 3 min at
30-min intervals before, during, and after a continuous superfusion
with 20 nM Cetrorelix for 2 h (horizontal bar). (c)
LH responses of pituitary cells from OVX rats to 1 nM LH-RH pulses (L)
for 3 min at 30-min intervals before, during, and after a continuous
superfusion with 20 nM Cetrorelix for 2 h (horizontal bar).
(d) LH responses of control cells from OVX rats to 1 nM
LH-RH pulses for 3 min at 30-min intervals (L).