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Establishment of Coloproctitis Cancer Model in Mice and Evaluation of Therapeutic Effect of Chinese Medicine
In This Article
Summary
This protocol provides a mouse model of ulcerative coloproctitis-associated colorectal cancer induced by azomethane combined with dextran sulfate sodium. The model was used to evaluate the efficacy of traditional Chinese medicine compounds in the prevention and treatment of colorectal cancer.
Abstract
Colorectal cancer (CRC) is a common malignancy of the digestive system and has become the third most common malignancy worldwide and the second leading cause of malignancy-related death. Ulcerative coloproctitis (UC) is a precancerous lesion, and UC-associated CRC (UC-CRC) is the most common subtype of CRC. Therefore, a reasonable UC-CRC model is the cornerstone and guarantee of new drug development. Traditional Chinese medicine (TCM) has been widely used in the treatment of UC-CRC due to its good efficacy. As a classic tonic prescription of TCM, Liujunzi decoction (LJZD) has been widely used in the treatment of UC-CRC. In this study, a UC-CRC model was established by combining azomethane and dextran sulfate sodium, and the LJZD was administered. The data confirmed that LJZD can effectively inhibit cancer transition in UC-CRC by using mouse body weight, colorectal length, pathological and inflammatory factors, colorectal barrier function, and cancer markers. This protocol provides a system for evaluating the efficacy of TCM in the prevention and treatment of UC-CRC.
Introduction
Colorectal cancer (CRC) is a common gastrointestinal malignancy, the third most common malignancy, and the second most common cause of death in the world, accounting for 10% of the global cancer incidence and 9.4% of the total cancer-related death1,2. Genetic factors, chronic inflammation, high-fat diet, diabetes, and abnormal intestinal flora are risk factors for CRC3,4. Among them, inflammatory bowel disease, especially ulcerative coloproctitis (UC), is a clear risk factor for CRC5,6. UC-asso....
Protocol
The animal procedure has been approved by the Ethics Committee of Changchun University of Chinese Medicine (Record number: 2021214). Specific pathogen-free C57BL/6J mice (8-10 weeks, weight 18-22 g), male and female, were housed in independently ventilated cages at 22 °C and 65% relative humidity. The mice began the experiment after 7 d of adaptive feeding, during which they had free access to water and diet.
1. Drug preparation
- Preparation of LJZD
R.......
Representative Results
The decoction of LJZD was prepared according to the composition ratio of drugs in Table 1 and the decoction method of TCM in Figure 1A. According to the time point indicated in Figure 1B, mice were intraperitoneally injected with 1 mg/mL AOM on the 7th day, and mice were given free access to drinking water containing 2% DSS in the 3rd, 6th, and 9th weeks. The UC-CRC mouse model was successfully establi.......
Discussion
CRC is one of the most common cancers worldwide, with approximately 1,148,000 new cases and more than 576,000 deaths each year. CRC can be divided into three types according to different causes, including hereditary, sporadic and UC-CRC31. The incidence of CRC in patients with inflammatory bowel diseases such as UC is significantly higher than that in the general population. UC stimulates the development of CRC through the inflammatory-cancer pathway, which differs from the typical adenoma-adenoca.......
Acknowledgements
This work was supported by the Jilin Provincial Department of Science and Technology (YDZJ202201ZYTS181).
....Materials
| Name | Company | Catalog Number | Comments |
| Azoxymethane | Sigma | A5486 | |
| 5-amino salicylic acid | Kuihua Pharmaceuticals Group Jiamusi Luling Pharmaceutical Co., Ltd | 3819413 | |
| C57BL/6J mice | Liaoning Changsheng Biotechnology Co., Ltd | NO 210726210100853716 | |
| Cover slip | Jiangsu Shitai Experimental Equipment Co., Ltd | 10212432C | |
| DAB color development kit | Jiangsu Shitai Experimental Equipment Co., Ltd | 2005289 | |
| Dewatering machine | Wuhan Junjie Electronics Co., Ltd | JJ-12J | |
| Dextran sulfate sodium | Dalian Meilun Biotechnology Co., Ltd | MB5535 | |
| Embedding machine | Wuhan Junjie Electronics Co., Ltd | JB-P5 | |
| Hematoxylin-eosin dye | Wuhan Hundred Degree Biotechnology Co., Ltd | B1000 | |
| IL-6 | Jiangsu Meimian Industrial Co., Ltd | MM-0163M2 | |
| Isoflurane | RWD Life Science Co., Ltd | R510-22-10 | |
| KI67 primary antibody | Google Biotechnology Inc | GB121141 | |
| Neutral gum | Wuhan Hundred Degree Biotechnology Co., Ltd | 10004160 | |
| Object slide | Jiangsu Shitai Experimental Equipment Co., Ltd | 10212432A | |
| Occludin primary antibody | Affnity | DF7504 | |
| Orthostatic optical microscope | Nikon | Nikon Eclipse CI | |
| Pathological microtome | Shanghai Leica Instrument Co., Ltd | RM2016 | |
| ZO-1 primary antibody | Abcam | ab221547 |
References
- Sung, H., et al. Global cancer statistics 2020: GLOBOCAN estimates of incidence and mortality worldwide for 36 Cancers in 185 Countries. CA Cancer J Clin. 71 (3), 209-249 (2021).
- Tsai, K. Y., et al.
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