Abstract：
:The synthesis and secretion of several acute-phase proteins increases markedly following physiological stress. alpha 1-Acid glycoprotein (AGP), a major acute-phase reactant made by the liver, is strongly induced by inflammatory agents such as lipopolysaccharide (LPS). Nuclear run-on assay showed a 17-fold increase in the rate of AGP transcription 4 h following LPS injection. DNase I footprinting assays revealed multiple protein binding domains in the mouse AGP-1 promoter region. Region B (-104 to -91) is protected by a liver-enriched transcription factor that is heat labile and in limiting quantity. An adjacent region, C (-125 to -104), is well-protected by nuclear extracts from hepatocytes. Electrophoretic mobility shift assays indicated that only one DNA-protein complex can form with an oligonucleotide corresponding to region B. However, nuclear proteins from untreated mouse liver can form three strong complexes (C1, C2, and C3) and a weak one (C4) with oligonucleotide C. An acute-phase-inducible DNA-binding protein (AP-DBP) forms complex 4. A dramatic increase (over 11-fold) in AP-DBP binding activity is seen with nuclear proteins from LPS-stimulated animals. Interestingly, AP-DBP, a heat-stable factor, can form heterodimers with the transcription factor CCAAT/enhancer binding protein (C/EBP). Furthermore, purified C/EBP also binds avidly to region C. Our studies indicate that several liver-enriched nuclear factors can interact with AGP-1 promoter and that AP-DBP binds to the AGP-1 promoter with high affinity only during the acute-phase induction.
journal_name
Biochemistryjournal_title
Biochemistryauthors
Alam T,Papaconstantinou Jdoi
10.1021/bi00122a005subject
Has Abstractpub_date
1992-02-25 00:00:00pages
1928-36issue
7eissn
0006-2960issn
1520-4995journal_volume
31pub_type
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