No abstract

Mesenchymal stem cells (MSCs) have been accepted as a promising cell source in tissue repair and regeneration. However, the inability to enrich MSCs in target areas limits their wide application. As a result, it has been a major goal to induce MSCs to be abundantly and specifically recruited to the injury site. In this study, a peptide with a specific affinity for MSCs (E7 peptide) was immobilized to a collagen scaffold via a collagen-binding domain (CBD) to construct a functional collagen scaffold. In addition, the hypothesis that this method could recruit MSCs specifically was evaluated in a porcine model. In vivo investigations indicated that due to the immunore-action, the CBD-MSC-peptide collagen scaffold enhanced MSC adhesion and infiltration and promoted wound healing. At day 7 after surgery, we found more infiltrating cells and capillaries in the Collagen/CBD-E7 peptide group compared to the Scaffold group. At day 14, 21 and 28, a faster healing process was observed in the Collagen/CBD-E7 peptide group, with significant differences compared with the other groups (P < 0.05, P < 0.01). The results demonstrate the potential use of targeted therapy to rapidly heal skin wounds.

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Objective: The aim of this study was to explain the effect of omeprazole on intestinal mucosal barrier after hemorrhagic shock in rats. Materials and methods: 81 rats were allocated to control, hemorrhagic shock model group and omeprazole group according to random number table, and each group was divided into three subgroups according to the time point of 0, 6, 12 h after HS and resuscitation. The rat model of hemorrhagic shock was induced by using the improved Wiggers method. Model group and omeprazole group were given physiological saline or omeprazole 30 mg/kg retention enema after the post-resuscitation. At three time points, the level of intestinal fatty acid binding protein (IFABP) in the serum was test by ELISA method, and the levels of serum endotoxin (LPS) was detected by dynamic turbidimetric method. The morphological changes of small intestinal mucosa in rats was observed under light microscope, VASP and ZO-1 mRNA expression was measured by RT-qPCR, while p-VASP and ZO-1 protein expression was measured by immunohistochemical method. Results: Compared with model group, serum endotoxin (LPS), fatty acid binding protein (IFABP) content gradually increased (P < 0.05, respectively), and intestinal mucosa damage was aggravate, VASP and ZO-1 gene expression were significantly down-regulation (P < 0.05, respectively) and p-VASP and ZO-1 protein expression were significantly depressed (P < 0.05, respectively). Conclusion: Omeprazole can significantly aggravate the intestinal mucosal barrier function by regulating VAASP and ZO-1 expression after hemorrhagic shock and resuscitation.