摘要
Endoscopic mucosal resection(EMR)and endoscopic submucosal dissection(ESD)are well-established therapeutics for gastrointestinal neoplasias,but complications after EMR/ESD,including bleeding and perforation,result in additional treatment morbidity and even threaten the lives of patients.Thus,designing biomaterials to treat gastric bleeding and wound healing after endoscopic treatment is highly desired and remains a challenge.Herein,a series of injectable pH-responsive selfhealing adhesive hydrogels based on acryloyl-6-aminocaproic acid(AA)and AA-g-N-hydroxysuccinimide(AA-NHS)were developed,and their great potential as endoscopic sprayable bioadhesive materials to efficiently stop hemorrhage and promote the wound healing process was further demonstrated in a swine gastric hemorrhage/wound model.The hydrogels showed a suitable gelation time,an autonomous and efficient self-healing capacity,hemostatic properties,and good biocompatibility.With the introduction of AA-NHS as a micro-cross-linker,the hydrogels exhibited enhanced adhesive strength.A swine gastric hemorrhage in vivo model demonstrated that the hydrogels showed good hemostatic performance by stopping acute arterial bleeding and preventing delayed bleeding.A gastric wound model indicated that the hydrogels showed excellent treatment effects with significantly enhanced wound healing with type I collagen deposition,α-SMA expression,and blood vessel formation.These injectable self-healing adhesive hydrogels exhibited great potential to treat gastric wounds after endoscopic treatment.
基金
This work was jointly supported by the National Natural Science Foundation of China(grant Nos.:51973172,51673155,81201927,82002957 and 81672460)
the National Key Research and Development Plan of China(No.2018YFC0115300)
the State Key Laboratory for Mechanical Behavior of Materials,the World-Class Universities(Disciplines)
the Characteristic Development Guidance Funds for the Central Universities,the Natural Science Foundation of Shaanxi Province(No.2020JC-03 and 2019TD-020)
the Innovation Talent Promotion Plan of Shaanxi(No.2017KJXX-07)
the Key Research and Development Program of Shaanxi Province(No.2019SF-012)
the Opening Project of Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research,College of Stomatology,Xi’an Jiaotong University(No.2019LHM-KFKT008)
Fundamental Research Funds for the Central Universities of China(No.xjj2018090).
