Regulation of interleukin (IL)-1beta gene transcription induced by IL-1beta in rheumatoid synovial fibroblast-like cells, E11, transformed with simian virus 40 large T antigen.
OBJECTIVE
To investigate the process involved in the production of and responsiveness to interleukin 1beta (IL-1beta) in synovial fibroblast-like cells, we analyzed the enhancer region of pro-IL-1beta gene in a cell clone, E11, established from a patient with rheumatoid arthritis (RA).


METHODS
A cell clone, E11, was derived from rheumatoid synovial fibroblast-like cells transformed with simian virus 40 large T antigen expression vector by electroporation. Responsiveness of E11 to IL-1beta was analyzed by [3H] thymidine incorporation and Northern blotting. IL-1beta responsive elements on pro-IL-1beta gene were analyzed by chloramphenicol acetyltransferase analysis.


RESULTS
E11 resembled synovial fibroblasts based on morphological characteristics and phenotypic analysis. It also demonstrated marked enhancement of proliferation and rapid induction of IL-1beta mRNA expression by IL-1beta. We also identified IL-1beta responsive elements on the pro-IL-1beta gene at a position between -3134 and -3092 that contains the AP-1 binding site and between -2782 and -2729, which includes both AP-1 and nuclear factor-kappaB (NF-kappaB) binding sites.


CONCLUSIONS
AP-1 and NF-kappaB binding elements were required for transcriptional regulation of the IL-1beta gene in the autocrine growth system of RA synovial cells.
Abe
M
M
First Department of Internal Medicine, University of Occupational and Environmental Health, School of Medicine, Kitakyushu, Japan.
Tanaka
Y
Y
Saito
K
K
Shirakawa
F
F
Koyama
Y
Y
Goto
S
S
Eto
S
S
D000952:Antigens, Polyomavirus Transforming / Q000494:pharmacology*; D001172:Arthritis, Rheumatoid / Q000473:pathology*; D002455:Cell Division / Q000187:drug effects; D002472:Cell Transformation, Viral / Q000235:genetics; D002999:Clone Cells; D005347:Fibroblasts / Q000187:drug effects; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D007375:Interleukin-1 / Q000235:genetics* / Q000494:pharmacology / Q000502:physiology; D016328:NF-kappa B / Q000502:physiology; D012333:RNA, Messenger / Q000378:metabolism; D013583:Synovial Membrane / Q000473:pathology*; D018808:Transcription Factor AP-1 / Q000502:physiology; D014158:Transcription, Genetic; D015854:Up-Regulation
D000952:Antigens, Polyomavirus Transforming; D007375:Interleukin-1; D016328:NF-kappa B; D012333:RNA, Messenger; D018808:Transcription Factor AP-1