Words similar to gonadotropes
Example sentences for: gonadotropes
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Two molecular loci recently have been implicated as potential modulators of GnRH receptor signaling: one is the receptor itself [ 23 ] , and the other is the G protein that transduces the signal generated by binding of the receptor to its agonist [ 9 ] . With respect to the former locus, G protein coupled receptor kinases (GRKs) act in an agonist-specific manner to phosphorylate intracellular regions of the receptor thus permitting β arrestin binding that sterically inhibits G protein association with the receptor [ 1 45 ] . We have reported previously that experimental expression of GRKs in GnRH receptor-expressing heterologous cells (COS-1) suppressed GnRH-stimulated IP 3 production, and that co-expression of GRK2 and β-arrestin 2 suppressed GnRH receptor signaling more than that of either alone [ 23 ] . Stronger evidence that the GRK/β arrestin paradigm may play a role in regulating GnRH receptor signaling is our recent finding that adenovirus-mediated gene transfer of GRK2 into normal pituitary gonadotropes suppressed GnRH-stimulated LH secretion and IP 3 production [ 31 ] . However, no evidence has been presented for a direct interaction between β-arrestin and the GnRH receptor.
Because of the evidence that the signal transduction pathway for GnRH in gonadotropes involves the GnRH receptor, Gqα, phospholipase Cβ, and cellular IP 3 release [ 39 40 ] , we determined the effect of RGS3 on GnRH-stimulated LH secretion using adenoviral-mediated gene transfer in rat pituitary cells (Fig.
Previously, we showed that RSG3 was expressed endogenously in rat pituitary cells and, when experimentally co-expressed together with GnRH receptors in a heterologous cell line (COS1), it suppressed GnRH-stimulated inositol trisphosphate production [ 9 ] . Here, those studies have been extended to include GnRH-stimulated LH secretion using adenovirus-mediated gene transfer of RGS3 complementary DNA into normal rat pituitary gonadotropes.
However, the calcium ionphore stimulated LH secretion in RGS3-expressing gonadotropes (Fig.
The pituitaries were dispersed with trypsin as described before [ 32 ] . The mono-dispersed cells were plated into poly-L-lysine coated 60 mm plastic Petri dishes in DMEM/10% gelding horse serum containing 10 -9M estradiol to optimize the GnRH-responsiveness of the gonadotropes [ 33 ] , and incubated overnight at 37°C in 8% CO 2 -92% air.
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