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GABAB receptors negatively regulate transcription in cerebellar granular neurons through cyclic AMP responsive element binding protein-dependent mechanisms.

Abstract：

:GABAB receptors affect short-term signalling in various cell types. However, nothing is known about possible long-term effects on transcription. To analyse such effects in the CNS, we studied GABAB receptor-mediated gene regulation in primary cultures of cerebellar granule neurons. Transcription was followed using a chloramphenicol acetyl transferase reporter gene driven by the minimal cyclic AMP-responsive element (TGACGTCA). Transcription was stimulated by activation of both the cyclic AMP (forskolin: 5 x 10(-6) M) and the Ca2+ dependent (KCl: 30 mM) pathways (-)-Baclofen (10(-6) M to 10(-4) M), a specific GABAB receptor agonist, reduced by 50-70% the transcriptional stimulation evoked by both forskolin and KCl, whereas isoguvacine, a GABAA receptor agonist, was without effect. Moreover, the GABAB antagonist CGP 35348 abrogated the inhibitory effects of both GABA and baclofen, indicating that GABAB receptors were specifically implicated in this response. Measurements of cyclic AMP levels suggested that (-) baclofen inhibits forskolin-initiated transcription by reducing cyclic AMP production. Direct transcriptional activation, via the cyclic AMP pathway, by overexpression of the catalytic subunit of the cyclic AMP-dependent protein kinase, was not significantly altered by (-) baclofen. This indicates again that (-) baclofen-dependent inhibitory mechanisms operate upstream of cyclic AMP-dependent protein kinase at the level of second messenger formation. Further, we used a yeast transcriptional activator GAL4-cyclic AMP-responsive element binding protein to analyse whether GABAB receptor-mediated inhibition of cyclic AMP-responsive element transcription implicated the transacting factor cyclic AMP-responsive element binding protein. We show that the negative effects of (-) baclofen implicate this transcription factor and this holds good for both the forskolin and KCl-stimulated pathways. The results indicate that GABAB receptors negatively regulate cyclic AMP-responsive element binding protein-mediated transcription in the CNS.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Barthel F,Kienlen Campard P,Demeneix BA,Feltz P,Loeffler JP

doi

10.1016/0306-4522(95)00380-0

subject

Has Abstract

pub_date

1996-01-01 00:00:00

pages

417-27

issue

2

eissn

0306-4522

issn

1873-7544

pii

0306452295003800

journal_volume

70

pub_type

杂志文章

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