The application belongs to the field of biological
medicine, and particularly relates to application of an extract of Pteronura dumerelli in preparation of a
medicine for treating
ulcerative colitis, and aims to solve the technical problems of weak mucosa repair capacity,
high recurrence rate after
drug withdrawal, prominent long-term application safety problem, poor
drug response or
drug resistance of part of patients, and poor economic
accessibility of existing
ulcerative colitis treatment medicines. The preparation of the extract comprises the following steps: edible soft tissues of Pteronura dumerelli are washed with
clean water to remove impurities, and then subjected to tissue crushing and homogenization treatment in a preset low-temperature environment; a compound
enzyme system composed of
neutral protease and
papain is added to perform mild limited enzymolysis, and active small-molecule peptides and
polysaccharide components are reserved; after low-temperature
centrifugation to remove precipitates, two-stage
ultrafiltration membranes are used for grading purification, high-activity small-molecule anti-inflammatory repair components are enriched, and finally low-temperature vacuum concentration and
sterile filtration are performed to obtain a light yellow water-soluble active extract. The extract can inhibit activation of a
nuclear factor kappa B inflammatory pathway, down-regulate levels of
tumor necrosis factor alpha,
interleukin 6 and
interleukin 1 beta proinflammatory factors, reduce intestinal inflammatory
cascade reaction, up-regulate expression of
tight junction proteins
Occludin and
Claudin-1, repair damaged intestinal
epithelial barrier, promote ulcer mucosa regeneration and healing, and realize a double synergistic
treatment effect of anti-
inflammation and mucosa repair.