Progesterone-facilitated
lordosis is enhanced by activation of, and inhibited by antagonism of,
dopamine type 1 receptors (D1) in the ventral tegmental area (VTA). Given that D1 activation leads to increases in
cyclic AMP (cAMP), we hypothesised that, in the VTA,
progesterone's actions on
lordosis that involve D1 are mediated, in part, by cAMP. In Experiment 1, naturally receptive rats and hamsters were pretested for
lordosis, infused with the cAMP analogue
8-bromo-cAMP (200 ng) or vehicle to the VTA, and tested again 30 min later. In Experiments 2 and 3, ovariectomised,
oestradiol (10 microg) +
progesterone (0 or 100 microg)-primed rats and
oestradiol (10 microg) +
progesterone (0 or 200 microg)-primed hamsters were pretested for
lordosis and infused with
8-bromo-cAMP (200 ng), the
adenylyl cyclase inhibitor
2',5'-dideoxyadenosine (12 microM) or vehicle to the VTA. Subjects were tested again 30 min later. In Experiment 4,
oestradiol +
progesterone-primed rats and hamsters were pretested and infused with the D1 agonist
SKF38393 (0 or 100 ng) to the VTA. Thirty minutes later, subjects were tested again and infused with
2',5'-dideoxyadenosine (12 microM) or vehicle. Subjects were tested again 30 min later. VTA infusions of
8-bromo-cAMP enhanced
lordosis of naturally receptive or
hormone-primed rats and hamsters and
2',5'-dideoxyadenosine decreased
lordosis of
oestradiol +
progesterone-primed rats and hamsters. D1-mediated increases in
progesterone-facilitated
lordosis were reduced by
2',5'-dideoxyadenosine. These data suggest that
progesterone-facilitated
lordosis of rats and hamsters may be modulated by D1 and cAMP activity in the VTA.