Literature DB >> 7535175

Evidence that TRH controls prolactin release from rat lactotrophs by stimulating a calcium influx.

N C Guérineau1, P M Lledo, D Verrier, J M Israel.   

Abstract

Prolactin (PRL) release and intracellular free calcium concentration [Ca2+]i were measured in two populations of normal rat lactotrophs (light and heavy fractions) in culture. Spontaneous PRL release of heavy fraction cells was more sensitive to dihydropyridines (DHPs; Bay K 8644 and nifedipine) when compared to the light fraction lactotrophs. The stimulatory effect of thyrotropin-releasing hormone (TRH) on PRL release from heavy fraction cells was inhibited by Cd2+ and mimicked by Bay K 8644. Indo-1 experiments revealed that TRH-increased [Ca2+]i was reversibly inhibited by Cd2+. In a Ca(2+)-free EGTA-containing medium, TRH did not modify [Ca2+]i.

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Year:  1994        PMID： 7535175     DOI： 10.1007/bf00755776

Source DB:  PubMed          Journal:  Cell Biol Toxicol        ISSN： 0742-2091            Impact factor:   6.691


  20 in total

1.  Membrane currents in identified lactotrophs of rat anterior pituitary.

Authors:  C J Lingle; S Sombati; M E Freeman
Journal:  J Neurosci       Date:  1986-10       Impact factor: 6.167

2.  Plateau potentials recorded from lactating rat enriched lactotroph cells are triggered by thyrotropin releasing hormone and shortened by dopamine.

Authors:  J M Israel; L A Kukstas; J D Vincent
Journal:  Neuroendocrinology       Date:  1990-02       Impact factor: 4.914

3.  Nimodipine block of calcium channels in rat anterior pituitary cells.

Authors:  C J Cohen; R T McCarthy
Journal:  J Physiol       Date:  1987-06       Impact factor: 5.182

4.  Voltage-activated currents through calcium channels in normal bovine lactotrophs.

Authors:  P Cobbett; C D Ingram; W T Mason
Journal:  Neuroscience       Date:  1987-11       Impact factor: 3.590

Review 5.  Thyrotropin releasing hormone. A review of the mechanisms of acute stimulation of pituitary hormone release.

Authors:  M C Gershengorn
Journal:  Mol Cell Biochem       Date:  1982-06-25       Impact factor: 3.396

6.  Dopamine inhibits two characterized voltage-dependent calcium currents in identified rat lactotroph cells.

Authors:  P M Lledo; P Legendre; J M Israel; J D Vincent
Journal:  Endocrinology       Date:  1990-09       Impact factor: 4.736

7.  Measurement of CA2+ transients using simultaneous dual-emission microspectrofluorimetry and electrophysiology in individual pituitary cells.

Authors:  P Mollard; N Guerineau; J Audin; B Dufy
Journal:  Biochem Biophys Res Commun       Date:  1989-11-15       Impact factor: 3.575

8.  Opposing actions of Bay K 8644 enantiomers on calcium current, prolactin secretion, and synthesis in pituitary cells.

Authors:  J J Enyeart; B Biagi; R N Day
Journal:  Mol Endocrinol       Date:  1990-05

9.  Electrophysiological responses to dopamine of rat hypophysial cells in lactotroph-enriched primary cultures.

Authors:  J M Israel; C Kirk; J D Vincent
Journal:  J Physiol       Date:  1987-09       Impact factor: 5.182

10.  Participation of voltage-sensitive calcium channels in pituitary hormone release.

Authors:  S S Stojilković; S Izumi; K J Catt
Journal:  J Biol Chem       Date:  1988-09-15       Impact factor: 5.157
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