Abstract：
:Degradation of heme requires its conversion to biliverdin (BV) by heme oxygenase, followed by reduction of BV to the free-radical quencher bilirubin (BR) by biliverdin reductase (BVR). It is now recognized that human BVR (hBVR) is a dual-specificity kinase (Ser/Thr and Tyr) upstream activator of the insulin/insulin growth factor-1 (IGF-1) and mitogen-activated protein kinase (MAPK) signaling pathways. hBVR is also a basic-leucine-zipper (bZip) DNA/chromatin-binding transcription factor, an activator and anchor protein for translocation of protein kinase C betaII and zeta isozymes within cell compartments, and a kinase kinase for their activation. hBVR is essential for MAPK-extracellular signal-regulated kinase (ERK)1/2 (MEK)-eukaryotic-like protein kinase (Elk) signaling and has been identified as the cytoplasm-nuclear heme transporter of ERK1/2 and hematin, the key components of stress-responsive gene expression. Here, we discuss the recently uncovered functions of hBVR in cell signaling and regulation of gene expression, and the role of BR in cellular signaling, cytoprotection and cytotoxicity.
journal_name
Trends Pharmacol Scijournal_title
Trends in pharmacological sciencesauthors
Kapitulnik J,Maines MDdoi
10.1016/j.tips.2008.12.003subject
Has Abstractpub_date
2009-03-01 00:00:00pages
129-37issue
3eissn
0165-6147issn
1873-3735pii
S0165-6147(09)00015-7journal_volume
30pub_type
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