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2015 ; 35
(24
): 4212-21
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Posttranscriptional Regulation of the Inflammatory Marker C-Reactive Protein by
the RNA-Binding Protein HuR and MicroRNA 637
#MMPMID26438598
Kim Y
; Noren Hooten N
; Dluzen DF
; Martindale JL
; Gorospe M
; Evans MK
Mol Cell Biol
2015[Dec]; 35
(24
): 4212-21
PMID26438598
show ga
C-reactive protein (CRP), an acute-phase plasma protein, is a major component of
inflammatory reactions functioning as a mediator of innate immunity. It has been
widely used as a validated clinical biomarker of the inflammatory state in
trauma, infection, and age-associated chronic diseases, including cancer and
cardiovascular disease (CVD). Despite this, the molecular mechanisms that
regulate CRP expression are not well understood. Given that the CRP 3'
untranslated region (UTR) is long and AU rich, we hypothesized that CRP may be
regulated posttranscriptionally by RNA-binding proteins (RBPs) and by microRNAs.
Here, we found that the RBP HuR bound directly to the CRP 3' UTR and affected CRP
mRNA levels. Through this interaction, HuR selectively increased CRP mRNA
stability and promoted CRP translation. Interestingly, treatment with the
age-associated inflammatory cytokine interleukin-6 (IL-6) increased binding of
HuR to CRP mRNA, and conversely, HuR was required for IL-6-mediated upregulation
of CRP expression. In addition, we identified microRNA 637 (miR-637) as a
microRNA that potently inhibited CRP expression in competition with HuR. Taken
together, we have uncovered an important posttranscriptional mechanism that
modulates the expression of the inflammatory marker CRP, which may be utilized in
the development of treatments for inflammatory processes that cause CVD and
age-related diseases.
|3' Untranslated Regions/genetics
[MESH]
|Biomarkers/blood/metabolism
[MESH]
|C-Reactive Protein/*genetics/metabolism
[MESH]
|Cell Line, Tumor
[MESH]
|ELAV-Like Protein 1/blood/genetics/*metabolism
[MESH]