Qing Hua Chang Yin ameliorates chronic colitis in mice by inhibiting PERK–ATF4–CHOP pathway of ER stress and the NF-κB signalling pathway

Ulcerative colitis has been clinically treated with Qing Hua Chang Yin (QHCY), a traditional Chinese medicine formula. However, its precise mechanisms in mitigating chronic colitis are largely uncharted.