Abstract
We have generated mice in which the gene encoding the transcription factor STAT3 can be inactivated in multiple cell types by triggering the endogenous production of type I interferon. Gene inactivation is particularly effective in the liver and the adipose tissue, as well as in macrophages and gut epithelial cells. Upon induction of the mutation, mice develop a wasting syndrome culminating in an aggressive and fatal form of enterocolitis, limited to the large intestine, within 2-3 weeks after the treatment. The disease is characterised by massive infiltration of the gut mucosa by macrophages, granulocytes and CD4+ cells, increased expression of endothelial adhesion molecules and high production of the cytokines interleukin (IL)-6, IL-12, interferon-γ and IL-10. IL-12 p40 plays a pivotal role in disease development as in vivo treatment with neutralising antibodies completely prevents its onset. Interestingly, oral treatment with wide spectrum antibiotics does not have any effect on either the onset or the development of colitis. Taken together, these data show that STAT3 plays a crucial role in the maintenance of intestinal homeostasis and possibly in mediating specialised cell functions in the intestinal epithelium.
Original language | English (US) |
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Pages (from-to) | 45-56 |
Number of pages | 12 |
Journal | Cytokine |
Volume | 26 |
Issue number | 2 |
DOIs | |
State | Published - Apr 21 2004 |
Funding
We would like to thank Drs. P. Garside and F. Powrie for critically reading the manuscript. We are grateful to Mr. D. Lunny for help with keratin immunostaining, Drs. U. Betz and K. Rajewsky for providing the MX-Cre mouse transgenic line, Drs. F. Powrie, S. Cobbold, R.L.Coffman, S. Landolfo, and A. Vecchi for the gift of antibodies, Drs. P. Crocker and R. Porter for helpful advice and Mrs. L. Malone and V. Murray-Tait for expert mouse care. STAT3-targeted mice were generated at the Istituto di Biologia Molecolare I.R.B.M. P. Angeletti by V.P. and T.A. V.P. was supported by the Wellcome Trust, MIUR (Ministero dell'Istruzione, dell'Università e della Ricerca) and AIRC (Associazione Italiana Ricerca sul Cancro). T.A. was supported by Ministero della Sanità (Ricerca Finalizzata), and was the recipient of an EC Marie Curie. E. Di C. was the recipient of a FIRC (Italian Foundation for Cancer Research) Post-doctoral fellowship.
Keywords
- Conditional gene inactivation
- Enterocolitis
- Inflammation
- Inflammatory bowel disease
- STAT3
ASJC Scopus subject areas
- Molecular Biology
- Hematology
- Biochemistry
- Immunology and Allergy
- Immunology