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2015 ; 35
(7
): 1223-37
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p54nrb/NONO regulates cyclic AMP-dependent glucocorticoid production by
modulating phosphodiesterase mRNA splicing and degradation
#MMPMID25605330
Lu JY
; Sewer MB
Mol Cell Biol
2015[Apr]; 35
(7
): 1223-37
PMID25605330
show ga
Glucocorticoid production in the adrenal cortex is activated in response to an
increase in cyclic AMP (cAMP) signaling. The nuclear protein p54(nrb)/NONO
belongs to the Drosophila behavior/human splicing (DBHS) family and has been
implicated in several nuclear processes, including transcription, splicing, and
RNA export. We previously identified p54(nrb)/NONO as a component of a protein
complex that regulates the transcription of CYP17A1, a gene required for
glucocorticoid production. Based on the multiple mechanisms by which
p54(nrb)/NONO has been shown to control gene expression and the ability of the
protein to be recruited to the CYP17A1 promoter, we sought to further define the
molecular mechanism by which p54(nrb)/NONO confers optimal cortisol production.
We show here that silencing p54(nrb)/NONO expression in H295R human
adrenocortical cells decreases the ability of the cells to increase intracellular
cAMP production and subsequent cortisol biosynthesis in response to
adrenocorticotropin hormone (ACTH) stimulation. Interestingly, the expression of
multiple phosphodiesterase (PDE) isoforms, including PDE2A, PDE3A, PDE3B, PDE4A,
PDE4D, and PDE11A, was induced in p54(nrb)/NONO knockdown cells. Investigation of
the mechanism by which silencing of p54(nrb)/NONO led to increased expression of
select PDE isoforms revealed that p54(nrb)/NONO regulates the splicing of a
subset of PDE isoforms. Importantly, we also identify a role for p54(nrb)/NONO in
regulating the stability of PDE transcripts by facilitating the interaction
between the exoribonuclease XRN2 and select PDE transcripts. In summary, we
report that p54(nrb)/NONO modulates cAMP-dependent signaling, and ultimately
cAMP-stimulated glucocorticoid biosynthesis by regulating the splicing and
degradation of PDE transcripts.