Abstract
Background and aims
The expression of signal transducers and activators of transcription 3 (STAT3) is increased in Crohn’s disease (CD), and nuclear translocated STAT3 is also found in the disease. However, the role of STAT3 protein on the pathogenesis of CD is not clear. This study was executed to investigate the role of STAT3 protein on the pathogenesis of trinitrobenzene sulfonic acid (TNBS)-induced colitis, the pathogenesis of which is CD-like.
Methods
TNBS-induced colitis was produced, and STAT3 antisense oligonucleotide was administrated intracolonically during the early phase of colitis. The mice were killed 7 days later, and the expressions of STAT3 and phosphorylated STAT3 were identified by Western blot and immunofluorescence. The lamina propria mononuclear cells (LPMCs) were isolated freshly, and the percent of cell death and the expressions of Bcl-2 and Bax in LPMCs were evaluated. Colonic tissue damage and the production of inflammatory cytokines were measured also.
Results
Administration of STAT3 antisense oligonucleotide effectively inhibited STAT3 expression and phosphorylation in inflamed colonic mucosa of colitis. The mice that were administered STAT3 antisense oligonucleotide showed less colonic tissue damage with decreased production of inflammatory cytokines such as TNF-α and INF-γ in mucosa compared with that of those TNBS-induced colitis. Administration of STAT3 antisense oligonucleotide successfully induced apoptosis of LPMCs and counteracted the unbalanced expressions of Bcl-2 and Bax in LPMCs from colitis.
Conclusions
STAT3 activation may play an important role in the inflammatory process of TNBS-induced colitis, and inhibiting STAT3 activation during the early phase of the inflammatory response may have a beneficial effect on the colitis.
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Abbreviations
- ASON:
-
antisense oligonucleotide
- CD:
-
Crohn’s disease
- INF-γ:
-
interferon γ
- IL-6:
-
interleukin-6
- LPMCs:
-
lamina propria mononuclear cells
- MMAS:
-
mismatch antisense oligonucleotide
- MPO:
-
myeloperoxidase
- NF-κB:
-
nuclear factor-kappa B
- PMN:
-
polymorphonuclear
- pSTAT3:
-
phosphorylated STAT3
- STAT:
-
signal transducers and activators of transcription
- TNBS:
-
trinitrobenzene sulfonic acid
- TNF-α:
-
tumor necrosis factor-α
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Bai, A., Hu, P., Chen, J. et al. Blockade of STAT3 by antisense oligonucleotide in TNBS-induced murine colitis. Int J Colorectal Dis 22, 625–635 (2007). https://doi.org/10.1007/s00384-006-0229-z
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DOI: https://doi.org/10.1007/s00384-006-0229-z