Interferon-gamma induces AT(2) receptor expression in fibroblasts by Jak/STAT pathway and interferon regulatory factor-1.
The expression of angiotensin II type 2 (AT(2)) receptor is closely associated with cell growth, differentiation, and/or injury. We examined the effect of interferon (IFN)-gamma on AT(2) receptor expression in mouse fibroblast R3T3 cells and demonstrated that IFN-gamma treatment increased the expression of AT(2) receptor mRNA as well as its binding. Interferon regulatory factor (IRF)-1 was induced in mouse fibroblast R3T3 cells after IFN-gamma stimulation, and electrophoretic mobility shift assay showed an increase in IRF-1 binding with the IRF-specific binding sequence in the AT(2) receptor gene promoter region after IFN-gamma stimulation. The IRF-1 gene promoter contains an IFN-gamma-activated sequence (GAS) motif for possible binding of signal transducer(s) and activator(s) of transcription (STAT). Indeed, in R3T3 cells, IFN-gamma treatment resulted in rapid activation of Janus kinase (Jak) 1, Jak2, and STAT1 via tyrosine phosphorylation. Electrophoretic mobility shift assay with the GAS probe revealed increased STAT1 binding to the IRF-1 gene promoter in response to IFN-gamma stimulation. Transfection of GAS-binding oligonucleotides inhibited the effect of IFN-gamma on IRF-1 production, resulting in the AT(2) receptor trans-activation. Taken together, our data show that IFN-gamma upregulates AT(2) receptor expression in R3T3 cells via the activation of the intracellular Jak/STAT pathway and production of IRF-1.
Horiuchi
M
M
Cardiovascular Research, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA. horiuchi@m.ehime-u.ac.jp
Hayashida
W
W
Akishita
M
M
Yamada
S
S
Lehtonen
J Y
JY
Tamura
K
K
Daviet
L
L
Chen
Y E
YE
Hamai
M
M
Cui
T X
TX
Iwai
M
M
Minokoshi
Y
Y
D016475:3T3 Cells / Q000737:chemistry / Q000201:enzymology; D000809:Angiotensins / Q000502:physiology; D000818:Animals; D002455:Cell Division / Q000235:genetics; D004268:DNA-Binding Proteins / Q000378:metabolism*; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects / Q000276:immunology; D050856:Interferon Regulatory Factor-1; D007371:Interferon-gamma / Q000494:pharmacology*; D053613:Janus Kinase 1; D053614:Janus Kinase 2; D051379:Mice; D009131:Muscle, Smooth, Vascular / Q000166:cytology / Q000201:enzymology*; D009841:Oligonucleotides / Q000494:pharmacology; D010750:Phosphoproteins / Q000378:metabolism*; D011401:Promoter Regions, Genetic / Q000502:physiology; D011485:Protein Binding / Q000235:genetics; D011505:Protein-Tyrosine Kinases / Q000378:metabolism*; D011518:Proto-Oncogene Proteins; D051381:Rats; D017207:Rats, Sprague-Dawley; D044140:Receptor, Angiotensin, Type 1; D044139:Receptor, Angiotensin, Type 2; D011945:Receptors, Angiotensin / Q000235:genetics*; D050794:STAT1 Transcription Factor; D015398:Signal Transduction / Q000502:physiology; D015534:Trans-Activators / Q000378:metabolism; D014158:Transcription, Genetic / Q000187:drug effects / Q000502:physiology; D014162:Transfection
D000809:Angiotensins; D004268:DNA-Binding Proteins; D050856:Interferon Regulatory Factor-1; C494258:Irf1 protein, mouse; C494259:Irf1 protein, rat; D009841:Oligonucleotides; D010750:Phosphoproteins; D011518:Proto-Oncogene Proteins; D044140:Receptor, Angiotensin, Type 1; D044139:Receptor, Angiotensin, Type 2; D011945:Receptors, Angiotensin; D050794:STAT1 Transcription Factor; C494080:Stat1 protein, mouse; C494081:Stat1 protein, rat; D015534:Trans-Activators; D007371:Interferon-gamma; D011505:Protein-Tyrosine Kinases; C507905:Jak1 protein, mouse; C507906:Jak1 protein, rat; C507926:Jak2 protein, mouse; C507927:Jak2 protein, rat; D053613:Janus Kinase 1; D053614:Janus Kinase 2