Inhibition by dopamine of super(86)Rb efflux and hormone secretion from bovine anterior pituitary cells perifused in the presence of acetylcholine or TRH

The effects of dopamine (10 super(-5) M) on growth hormone and prolactin secretion and the fractional rate of super(86)Rb efflux were investigated using perifused bovine pituitary cells. Dopamine decreased the control efflux rate, prevented the rise caused by thyroliberin (10 super(-7) M) in the pre...

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Bibliographic Details
Published in:FEBS letters 1982-01, Vol.148 (1), p.27-30
Main Authors: Bicknell, S, Saith, S, Schofield, J G
Format: Article
Language:English
Subjects:
acetylcholine
cattle
dopamine
pituitary (anterior)
prolactin
rubidium
somatotropin
thyroliberin
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Summary:The effects of dopamine (10 super(-5) M) on growth hormone and prolactin secretion and the fractional rate of super(86)Rb efflux were investigated using perifused bovine pituitary cells. Dopamine decreased the control efflux rate, prevented the rise caused by thyroliberin (10 super(-7) M) in the presence of 3-isobutyl-1-methyl-xanthine (10 super(-4) M) and greatly decreased the rise caused by acetlycholine (2.5X10 super(-5) M). Under these conditions it inhibited the prolactin secretion but it had no effect on growth hormone secretion induced by either treatment. Dopamine receptors in lactotrophs are therefore coupled to secretion and potassium permeability, but if somatotrophs contain dopamine receptors they are coupled only to K super(+) efflux.
ISSN:0014-5793