Publication Date:
2012-10-09
Description:
The endoplasmic reticulum (ER) is the primary organelle for folding and maturation of secretory and transmembrane proteins. Inability to meet protein-folding demand leads to "ER stress," and activates IRE1alpha, an ER transmembrane kinase-endoribonuclease (RNase). IRE1alpha promotes adaptation through splicing Xbp1 mRNA or apoptosis through incompletely understood mechanisms. Here, we found that sustained IRE1alpha RNase activation caused rapid decay of select microRNAs (miRs -17, -34a, -96, and -125b) that normally repress translation of Caspase-2 mRNA, and thus sharply elevates protein levels of this initiator protease of the mitochondrial apoptotic pathway. In cell-free systems, recombinant IRE1alpha endonucleolytically cleaved microRNA precursors at sites distinct from DICER. Thus, IRE1alpha regulates translation of a proapoptotic protein through terminating microRNA biogenesis, and noncoding RNAs are part of the ER stress response.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3742121/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉 〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3742121/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Upton, John-Paul -- Wang, Likun -- Han, Dan -- Wang, Eric S -- Huskey, Noelle E -- Lim, Lionel -- Truitt, Morgan -- McManus, Michael T -- Ruggero, Davide -- Goga, Andrei -- Papa, Feroz R -- Oakes, Scott A -- DK063720/DK/NIDDK NIH HHS/ -- DP2 OD001925/OD/NIH HHS/ -- DP2OD001925/OD/NIH HHS/ -- GM080783/GM/NIGMS NIH HHS/ -- P30 DK063720/DK/NIDDK NIH HHS/ -- R01 CA136577/CA/NCI NIH HHS/ -- R01 CA136717/CA/NCI NIH HHS/ -- R01 CA140456/CA/NCI NIH HHS/ -- R01 CA154916/CA/NCI NIH HHS/ -- R01 DK080955/DK/NIDDK NIH HHS/ -- R01 GM080783/GM/NIGMS NIH HHS/ -- R01CA136577/CA/NCI NIH HHS/ -- R01CA136717/CA/NCI NIH HHS/ -- R01CA140456/CA/NCI NIH HHS/ -- R01CA154916/CA/NCI NIH HHS/ -- R01DK080955/DK/NIDDK NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2012 Nov 9;338(6108):818-22. doi: 10.1126/science.1226191. Epub 2012 Oct 4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, University of California, San Francisco, San Francisco, CA 94143, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23042294" target="_blank"〉PubMed〈/a〉
Keywords:
3' Untranslated Regions
;
Animals
;
Apoptosis
;
Brefeldin A/pharmacology
;
Caspase 2/*genetics/*metabolism
;
Cell-Free System
;
Cells, Cultured
;
Cysteine Endopeptidases/*genetics/*metabolism
;
Down-Regulation
;
Endoplasmic Reticulum/metabolism
;
*Endoplasmic Reticulum Stress
;
Endoribonucleases/chemistry/genetics/*metabolism
;
Enzyme Activation
;
HEK293 Cells
;
Humans
;
Mice
;
Mice, Knockout
;
MicroRNAs/*metabolism
;
Mutant Proteins
;
Protein Biosynthesis
;
Protein-Serine-Threonine Kinases/chemistry/genetics/*metabolism
;
RNA Stability
;
RNA, Messenger/genetics/metabolism
;
Up-Regulation
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
