LactotrophsPituitary Gland, AnteriorProlactinSomatotrophsThyrotropin-Releasing HormoneThyrotrophsPituitary GlandHyperprolactinemiaPlasmaGrowth HormoneTranscription Factor Pit-1MoltingSulpirideReceptors, Dopamine D2Cells, CulturedCadmium ChlorideExocytosisCalciumRadioimmunoassayDopamineRats, Sprague-DawleyRats, WistarEstrous CycleMembrane PotentialsEstradiolTime FactorsPlasma CellsDose-Response Relationship, DrugPotassiumPotassium ChannelsImmunohistochemistryCell MembraneInsulinCyclic AMPSecretory RateBodily SecretionsIntestinal SecretionsBacterial Secretion SystemsElectrophysiology