Linked Life Data

8033828

Source:http://linkedlifedata.com/resource/pubmed/id/8033828

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pubmed-article:8033828pubmed:abstractTextIn an attempt to elucidate the mechanism(s) underlying the paradoxical (inhibitory vs. stimulatory) effects of DA on PRL release, we treated permeabilized pituitary cells with antibodies directed against the carboxyl-terminus of the alpha-subunit of the guanine nucleotide binding protein, Gi3. Immunoneutralization of Gi alpha 3 completely blocked the inhibitory effect of 1000 nM DA on PRL release, as assessed by reverse hemolytic plaque assays. In contrast, DA at a 100-fold lower concentration (10 nM) had no effect on PRL release under control conditions, but elicited a stimulatory response in the presence of anti-Gi alpha 3. Examination of the frequency distribution of plaque sizes indicated that suppression and augmentation of PRL secretion by DA was not attributable to distinct subpopulations of lactotropes. Taken together, these data suggest that all pituitary lactotropes have the potential to respond to the inhibitory and stimulatory activities of DA. However, the stimulatory action of this monoamine is normally masked by tonic activation of Gi alpha 3 which couples DA to its inhibitory pathway.lld:pubmed
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pubmed-article:8033828pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:8033828pubmed:articleTitleParadoxical effects of dopamine (DA): Gi alpha 3 mediates DA inhibition of PRL release while masking its PRL-releasing activity.lld:pubmed
pubmed-article:8033828pubmed:affiliationDept. of Cell Biology and Anatomy, Medical University of South Carolina, Charleston 29425-2204.lld:pubmed
pubmed-article:8033828pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:8033828pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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