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Safflower polysaccharides (SPSs) show therapeutic potential for colitis by reducing inflammation and restoring gut health. These compounds modulate immune cell interactions, offering a novel approach to treating inflammatory bowel disease.

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Area of Science:

  • Immunology
  • Gastroenterology
  • Pharmacology

Background:

  • Colitis is a chronic inflammatory condition of the colon with limited therapeutic options.
  • Understanding the immunological mechanisms underlying colitis is crucial for developing effective treatments.
  • Safflower polysaccharides (SPSs) have shown potential in traditional medicine, but their immunomodulatory effects in colitis require detailed investigation.

Purpose of the Study:

  • To elucidate the immunological mechanisms by which Safflower polysaccharides (SPSs) regulate colitis.
  • To evaluate the therapeutic effects of SPSs on a rat model of colitis and in vitro cellular models.
  • To identify key molecular pathways and cellular interactions involved in SPSs' anti-colitis effects.

Main Methods:

  • Induction of colitis in rats using trinitrobenzene sulfonic acid (TNBS).
  • In vitro studies using TNF-α-stimulated Caco-2 cells, LPS-induced THP-1 cells, and co-culture models.
  • Investigation of CHI3L1's role using siRNA and recombinant CHI3L1 (r-CHI3L1).
  • Analysis of STAT3/NF-κB signaling pathways.

Main Results:

  • SPSs significantly ameliorated clinical symptoms and colonic pathological damage in TNBS-induced colitis rats.
  • SPSs reduced pro-inflammatory factors, inhibited macrophage M1 polarization, and restored colonic immunity in vivo.
  • In vitro, SPSs alleviated epithelial cell inflammation, inhibited macrophage M1 polarization, and regulated epithelial-immune cell interactions.
  • CHI3L1 was identified as a mediator of epithelial-immune cell interactions, crucial for SPSs' immunomodulatory effects.
  • STAT3/NF-κB signaling pathways were implicated in the therapeutic mechanisms of SPSs.

Conclusions:

  • Safflower polysaccharides (SPSs) demonstrate significant therapeutic efficacy in colitis models.
  • SPSs exert their effects through immunomodulation, including the inhibition of macrophage M1 polarization and regulation of epithelial-immune cell crosstalk via CHI3L1.
  • The findings highlight SPSs as a promising agent for colitis treatment, acting through STAT3/NF-κB signaling and CHI3L1-mediated mechanisms.