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Updated: Mar 8, 2026
Induction of Intestinal Inflammation by Adoptive Transfer of CBir1 TCR Transgenic CD4+ T Cells to Immunodeficient Mice
Published on: December 16, 2021
Ectopic expression of SIGIRR in the colon ameliorates colitis in mice by downregulating TLR4/NF-κB overactivation
Jinlin Liu1, Yanxia Chen2, Dongsheng Liu3
1Department of Gastroenterology, The First Affiliated Hospital of Nanchang University, No. 17,Yongwai Zheng Street, Nanchang, China; Institute of Molecular Medicine, Jiangxi Academy of Medical Sciences, No. 461, Bayi Road, Nanchang, China; Department of Clinical Laboratory, Zhejiang Provincial People's Hospital,158 Shangtang Road, Hangzhou, China.
Background:
Inflammatory bowel disease (IBD) is characterized by uncontrolled immune responses in inflamed mucosa, especially the TLR (Toll-like receptor) signaling pathway. Single Ig domain containing IL-1 receptor-related molecule (SIGIRR), a negative regulator of the TLR signaling pathway, whether had a therapeutic effect in a mouse model of IBD, and the underlying mechanism has not been investigated.
Methods:
Coacervation was used to prepare chitosan/pUNO-SIGIRR nanoparticles. The nanoparticles were administered to mice with colitis using enteroclysis. The disease activity index (DAI) and hematoxylin and eosin staining (HE) staining were used to evaluate the therapeutic effects of the SIGIRR nanoparticles. Immunohistochemistry was performed to elucidate the underlying mechanism driving these effects.
Results:
Chitosan/pUNO-SIGIRR nanoparticles were successfully constructed and were spherical, with a mean diameter of less than 100nm, and the plasmid encapsulating efficiency was 99.9%. The chitosan/pUNO-SIGIRR nanoparticles attenuated colonic tissue inflammation through the inhibition of TLR4/NF-κB overactivation by downregulating TLR4, MyD88 and NF-κB p65 expression in a mouse model of colitis.
Conclusions:
The novel chitosan/pUNO-SIGIRR nanoparticles had a therapeutic effect on IBD in a mouse model through the inhibition of TLR4/NF-κB overactivation.
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