Open Access26S proteasome inhibitors inhibit dexamethasone-dependent increase of tyrosine aminotransferase and tryptophan 2,3-dioxygenase mRNA levels in primary cultured rat hepatocytes
Author(s) -
Mizuho Harashima,
Masashi Hyuga,
Youko Nagaoka,
Chieko Saito,
Minako Furukawa,
Taiichiro Seki,
Toshio Ariga,
Nana Kawasaki,
Shingo Niimi
Publication year - 2012
Publication title -
journal of biophysical chemistry
Language(s) - English
Resource type - Journals
eISSN - 2153-0378
pISSN - 2153-036X
DOI - 10.4236/jbpc.2012.34043
Subject(s) - lactacystin , tyrosine aminotransferase , proteasome , messenger rna , glucocorticoid , microbiology and biotechnology , biology , glucocorticoid receptor , mg132 , proteasome inhibitor , tyrosine , reporter gene , cytosol , transfection , gene expression , biochemistry , enzyme , endocrinology , gene , enzyme inducer
Dexamethasone (Dex), a ligand for transcriptional enhancement of tyrosine aminotransferase (TAT) and tryptophan 2,3-dioxygenase (TO) genes, (100 nM) maximally increased these mRNA levels at 12 h and 7 h in primary cultured rat hepatocytes and the nuclear fraction, respectively. Lactacystin (5 μM) and epoxomicin (0.5 μM), 26S proteasome inhibitors, significantly suppressed the Dex-dependent maximum increase of TAT and TO mRNA levels in the cells and the nuclear fraction. Electrophoretic mobility shift assay demonstrated that lactacystin did not affect binding of glucocorticoid receptor to glucocorticoid responsive element. Furthermore, lactacystin did not affect the activation of GRE luciferase reporter by Dex transfected to the cells. The results demonstrate that 26S proteasome is positively involved in the Dex-dependent increase of TAT and TO mRNA levels in the cells and suggest that the mechanism of action of 26S proteasome may be degradation of some RNase(s), which breaks down TAT and TO mRNAs