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Differential regulation of corticotropin-releasing factor receptor type 1 (CRF1 receptor) mRNA via protein kinase A and mitogen-activated protein kinase pathways in rat anterior pituitary cells.

Abstract：

:Corticotropin-releasing factor (CRF) receptor type 1 (CRF(1) receptor) mRNA levels are down-regulated by CRF via the cyclic AMP-protein kinase A (PKA) pathway. In this study, we focused on the involvement of both the mitogen-activated protein (MAP) kinase pathway and PKA in this regulation. Real-time PCR (RT-PCR) revealed that a MAP kinase, extracellular signal-regulated kinases 1/2, pathway was also involved in the down-regulation of CRF(1) receptor mRNA levels by CRF in the rat anterior pituitary (AP). Down-regulation of CRF(1) receptor mRNA levels was caused by a post-transcriptional system such as mRNA degradation, as incubation with CRF significantly decreased the half-life of CRF(1) receptor mRNA. Furthermore, pre-treatment with a PKA inhibitor completely blocked CRF-induced CRF(1) receptor mRNA destabilization, while pre-treatment with an extracellular signal-regulated kinases 1/2 inhibitor had no inhibitory effect. These results suggested that in the rat AP, down-regulation of CRF(1) receptor mRNA levels is caused by mRNA degradation via PKA, but not by the MAP kinase pathway.

journal_name

Mol Cell Endocrinol

journal_title

Molecular and cellular endocrinology

authors

Moriyama T,Kageyama K,Kasagi Y,Iwasaki Y,Nigawara T,Sakihara S,Suda T

doi

10.1016/j.mce.2005.09.010

keywords:

subject

Has Abstract

pub_date

2005-11-24 00:00:00

pages

74-9

issue

1-2

eissn

0303-7207

issn

1872-8057

pii

S0303-7207(05)00333-3

journal_volume

243

pub_type

杂志文章

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