Colitis induced by PD-1 inhibitor combined with platinum-containing dual drug chemotherapy in Lewis mice and its mechanism

Author:

Li Chunhai1,Wang Lixin2,Sun Daqian1,Yao Tianxiao1,Xian Xiuying3,Cheng Yufeng4

Affiliation:

1. Department of Radiology, The Qilu Hospital of Shandong University, Jinan Shandong, China

2. School of Nursing and Rehabilitation, Shandong University, Jinan Shandong, China

3. Interventional Department, Jinan Central Hospital, Jinan Shandong, China

4. Department of Radiotherapy, The Qilu Hospital of Shandong University, Jinan Shandong, China

Abstract

ABSTRACT Aims: To explore the occurrence and possible mechanism of colitis in Lewis mice treated with PD-1 inhibitor combined with platinum-containing dual drug chemotherapy. Subjects and Methods: A Lewis lung cancer model of C57BL/6 mice was established, randomly divided into the treatment group (group C, PD-1 inhibitor + Carboplatin (CARB) + Pemetrexed (PEM)) and model group (group B, normal saline), and a control group (group A, normal saline) was set up. Observe the changes in tumor-free weight, tumor volume, disease activity index (DAI), colon histopathology, identify serum interleukin (IL)-10, interferon (IFN)-γ, the expression of claudin-1, and occludin mRNA in the colon in each animals. Results: Compared with group A, the tumor-free weight of mice in B decreased (P < 0.001), the content of IL-10 in serum increased (P < 0.01), the content of IFN-γ in serum decreased (P < 0.01). Compared with group B, the transplanted tumor volume in C was reduced (P < 0.05), DAI scores of D4 (P < 0.001), and D7 (P < 0.001) were increased, colonic histopathology analysis showed that colitis occurred, serum IL-10 content was decreased (P < 0.05), IFN-γ content was increased (P < 0.05), and the mRNA expression of claudin-1 (P < 0.05) and occludin (P < 0.05) was reduced. Conclusions: This treatment can inhibit the growth of transplanted tumors but will cause colitis in Lewis mice. The impairment of intestinal barrier function following administration cause an imbalance in the expression of pro-inflammatory and anti-inflammatory factors in the colon, thus causing colitis.

Publisher

Medknow

Subject

Radiology, Nuclear Medicine and imaging,Oncology,General Medicine

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