Abstract
Background
Trinitrobenzenesulfonic acid (TNBS)-induced colitis is one of the most widely used experimental colitis models. However, there is no standard procedure for inducing colitis by TNBS because it is difficult to achieve a uniform distribution of colitis. We have developed a modified method of murine TNBS-induced colitis that involves inhalation anesthesia with sevoflurane combined with both single and repeated TNBS administrations.
Aims
To compare the usefulness of our newly developed method for inducing murine TNBS-induced colitis with that of conventional intraperitoneal anesthesia.
Methods
TNBS in ethanol was administered to C57BL/6J mice held in an inverted vertical position either under continuous inhalation anesthesia with sevoflurane, in accordance with our newly developed method, or by intraperitoneal injection with 2.5 % avertin, in accordance with the conventional procedure. Body weight change, cytokine profile, and histological findings were examined during the course of colitis.
Results
The dispersion of anesthesia time, TNBS retention time, and nadir weight during the course of colitis was decreased using the newly developed method compared with the conventional procedure. Optimization of the modified TNBS-induced colitis, as evidenced by the predominant expression of Th1 and Th17 cytokines on day 7, was attained by the injection of 2.25 mg TNBS in 55 % ethanol. Regulation of the TNBS retention time using inhalation anesthesia with sevoflurane allowed strict control of the disease severity of TNBS-induced colitis. Using the modified method we were also able to develop a chronic TNBS-induced colitis model by repeated TNBS administration without excessive mortality of the mice.
Conclusions
Our modified method for murine TNBS-induced colitis using continuous inhalation anesthesia with sevoflurane provides a better experimental colitis model following both single and repeated TNBS administrations.
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Abbreviations
- CIA:
-
Continuous inhalation anesthesia
- IBD:
-
Inflammatory bowel disease
- IFN-γ:
-
Interferon gamma
- IL:
-
Interleukin
- IPA:
-
Intraperitoneal anesthesia
- Th:
-
T helper
- TNBS:
-
Trinitrobenzenesulfonic acid
- TNF-α:
-
Tumor necrosis factor alpha
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Acknowledgments
This research was supported by Grant-in-Aid for Scientific Research (C) 21590808 and 25460948 from the Ministry of Education, Culture, Sports, Science and Technology, Japan. We are grateful to Soichiro Mimuro for technical assistance regarding anesthesia in mice.
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10620_2013_3023_MOESM2_ESM.tif
Supplemental Fig. 1 Evaluation of single TNBS administration in BALB/c mice using continuous inhalation anesthesia. Female BALB/c mice were anesthetized by continuous ventilation with sevoflurane, and TNBS colitis was induced according to the protocol. On day 0, 1.25 mg of TNBS in 50 % ethanol was administered (n = 12). (a) Time course of body weight change during colitis. (b) Time course of TNBS retention volume. ©) Hematoxylin and eosin staining and Masson trichrome staining of representative colon sections on day 0 (control), 3, and 7 after TNBS administration. 10× magnification in upper section; 40× magnification in lower section. Histological findings on day 3 showed distortion of crypts, loss of goblet cells, and focal ulcers accompanied by edema in the mucosal or submucosal regions. By day 7, disrupted crypts and goblet cells regenerated in most parts of the mucosa, but infiltration of mononuclear cells was still prominent in the stromal tissue of basal mucosal areas. Trichrome-stained collagen deposits were observed in the stromal tissue in the mucosa and submucosa on day 3 and 7, respectively. (TIFF 2,885 kb)
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Terai, T., Osawa, S., Tani, S. et al. Induction of Murine TNBS Colitis Is Strictly Controlled by a Modified Method Using Continuous Inhalation Anesthesia with Sevoflurane. Dig Dis Sci 59, 1415–1427 (2014). https://doi.org/10.1007/s10620-013-3023-0
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DOI: https://doi.org/10.1007/s10620-013-3023-0