ABSTRACT
The mucous barrier is a major physiological obstacle that the mucosal drug delivery system needs to deal with. In response to this physiological barrier, many achievements have been made in research of mucosal adhesion and mucus penetration. This review puts emphasis on the progress of the research on new mucosal adhesion strategies such as cationization, sulfhydrylization, maleimide functionalization, lectinization and catechol conjugation; polyethylene glycol (PEG), polyvinyl alcohol (PVA), poly (2-alkyl-2-oxazoline) (POZ), zwitterionic polymers and other mucus-inert materials, strategies to enhance mucus penetration ability such as enzyme functionalization, reducing agent pretreatment and so on. The problems of each strategy are also analyzed and discussed, which can provide some references for clinical transformation.
ABSTRACT
Intestinal mucus barrier is a gel network composed of mucin, water and antimicrobial peptides. It is the first line defense of host against intestinal pathogens, and is also important for the survival and proliferation of symbiotic bacteria. Mucins are mainly synthesized and secreted by goblet cells of intestine, forming different structures in different intestinal segments. Nowadays more and more studies have shown that the mucus barrier is not only closely related to intestinal infection, inflammatory bowel disease, intestinal tumor and other intestinal diseases, but also involved in the occurrence and development of some extraintestinal diseases, such as acute pancreatitis, non-alcoholic fatty liver disease, which may become a new target for the treatment of various related diseases in the future.
ABSTRACT
Inflammatory bowel disease(IBD)is a non-specific,chronic intestinal inflammatory disease,which mainly includes ulcerative colitis(UC)and Crohn's disease(CD). The pathogenesis of IBD is not completely clear,and is mainly related to gene,environment,dysfunction of immune system and intestinal mucosal barrier. As the first defense line of intestinal mucosal barrier,the mucus barrier plays an important role in the occurrence and development of IBD. This article reviewed the advances in study on mucus barrier in IBD.