Journal
ACTA BIOMATERIALIA
Volume 143, Issue -, Pages 233-252Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.actbio.2022.02.039
Keywords
Ulcerative colitis; Hydrogel; Specific adhesion; Rectal delivery; Mucosal barrier repair
Funding
- Zhejiang Provincial Natu-ral Science Foundation [LY20H300002, LY19H180001, LQ19H300001]
- Zhejiang Provincial Foundation for Health Department [2021KY198]
- Wenzhou Science and Technology Bureau [Y20210211]
- National Natural Science Foundation of China [81772316, 81903551]
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In this study, a double-network hydrogel (PMSP) was developed for the targeted therapy of ulcerative colitis (UC). PMSP showed specific adhesion to the inflamed mucosa and exhibited good mechanical strength and bio-adhesive force. The treatment with PMSP-KPV improved colitis symptoms, promoted the recovery of the colonic epithelial barrier, and modulated the gut flora.
Ulcerative colitis (UC) usually occurs in the superficial mucosa of the colorectum. Here, a double-network hydrogel (PMSP) was constructed from maleimided gamma -polyglutamic acid and thiolated gamma -polyglutamic acid through crosslinking of thiol-maleimide and self-oxidized thiols. PMSP with a negative charge specifically adhered to the inflamed mucosa with positively charged proteins rather than to the healthy mucosa. PMSP exhibited good mechanical strength with storage modulus (G ' ) of 17.6 Pa and a linear viscoelastic region (LVR) of 107.2% strain. Moreover, PMSP showed a stronger bio-adhesive force toward the inflamed tissue-mimicking substrate than toward its healthy counterpart. In vivo imaging confirmed that PMSP specifically adhered to the inflamed colonic mucosa of rats with TNBS-induced UC. KPV (Lys-ProVal) as a model drug was easily captured by PMSP through electrostatic interactions, thus retaining its bioactivity for a longer time under high temperature conditions. Moreover, the alleviating effect of KPV on rats with TNBS-induced colitis was significantly improved by PMSP after intracolonic administration. The epithelial barrier of the colon also effectively recovered following PMSP-KPV treatment. PMSP-KPV also modulated the gut flora, markedly augmenting the abundance of beneficial microorganisms in gut homeostasis. The mechanism by which PMSP-KPV induces a therapeutic effect may be associated with the inhibition of oxidative stress. Conclusively, the PMSP hydrogel seems to be a promising rectal delivery system for the therapy of UC.
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