A novel tetra-PEG based hydrogel for prevention of esophageal stricture after ESD in a porcine model.

Endoscopic submucosal dissection (ESD) is an accepted treatment for early esophageal cancer and precancerous lesions, but resection of a large mucosal area often leads to postoperative esophageal stricture. Biomaterials provide a new option for the treatment of post-ESD ulcers. In this study, we developed a well-defined ammonolysis-based tetra-armed poly (ethylene glycol) (Tetra-PEG) hydrogel and investigated its efficacy and related mechanisms for preventing esophageal ESD-induced stricture in a porcine model. In terms of material properties, Tetra-PEG hydrogel present great biocompatibility，great capability to retain moisture, strong tissue adhesion and high mechanical strength. Then, six domestic female pigs were randomly divided into PEG (n = 3) and control groups (n = 3). A 3/4 of the esophageal circumference ESD was performed in all pigs. In PEG group, Tetra-PEG hydrogel was easily delivered via endoscopy and adhered to the ulcer bed tightly. Compared to control group, Tetra-PEG hydrogel accelerated esophageal ulcer healing at an early stage with enhanced epithelium regeneration, milder inflammation and lesser fibrosis by regulating TGF-ß/Smad2 signaling. Taken together, our findings reveal Tetra-PEG hydrogel is a promising and attractive candidate for preventing the formation of fibrotic stricture in the process of esophageal ESD-induced ulcer repair.

Colorectal sessile serrated lesion detection using linked-color imaging versus narrow-band imaging: a parallel randomized controlled trial.

BACKGROUND: Previous studies have reported the effectiveness of narrow-band imaging (NBI) and linked-color imaging (LCI) in improving the detection of colorectal neoplasms. There has however been no direct comparison between LCI and NBI in the detection of colorectal sessile serrated lesions (SSLs). The present study aimed to compare the effectiveness of LCI and NBI in detecting colorectal SSLs. METHODS: A prospective, parallel, randomized controlled trial was conducted. The participants were randomly assigned to the LCI or NBI arms. The primary end point was the SSL detection rate (SDR). RESULTS: 406 patients were involved; 204 in the LCI arm and 202 in the NBI arm. The total polyp detection rate, adenoma detection rate, and SDR were 54.2 %, 38.7 %, and 10.8%, respectively. The SDR was not significantly different between the LCI and NBI arms (12.3 % vs. 9.4 %; P = 0.36). The differences in the detection rate and the per-patient number of polyps, adenomas, diminutive lesions, and flat lesions between LCI and NBI also were not statistically significant. Multivariate analysis showed that LCI and NBI were not independent factors associated with SDR, whereas Boston Bowel Preparation Scale score (odds ratio [OR] 1.35, 95 %CI 1.03-1.76; P = 0.03), withdrawal time (OR 1.13, 95 %CI 1.00-1.26; P = 0.04), and operator experience (OR 3.73, 95 %CI 1.67-8.32; P = 0.001) were independent factors associated with SDR. CONCLUSIONS: LCI and NBI are comparable for SSL detection, as well as for the detection of polyps and adenomas.

Colorectal Sessile Serrated Lesion Detection Using Linked Color Imaging: A Multicenter, Parallel Randomized Controlled Trial.

BACKGROUND & AIMS: Linked color imaging (LCI) is a novel technology that improves the color differences between colorectal lesions and the surrounding mucosa. The present study aims to compare the detection of colorectal sessile serrated lesions (SSL) using LCI with white light imaging (WLI). METHOD: A large-scale, multicenter, parallel prospective randomized controlled trial was conducted in 4 hospitals in China. The participants were randomly assigned to the LCI group and WLI group. The primary endpoint was the SSL detection rate (SDR). RESULTS: A total of 884 patients were involved in the intention-to-treat analysis, with 441 patients in the LCI group and 443 patients in the WLI group. The total polyp detection rate, adenoma detection rate, and SDR were 51.8%, 35.7%, and 8.6%, respectively. The SDR was significantly higher in the LCI group than in the WLI group (11.3% vs 5.9%, P = .004). Furthermore, LCI significantly increased the number of polyps and adenomas detected per patient, when compared with WLI (P < .05). In addition, there was higher detection rate of diminutive and flat lesions in the LCI group (P < .05). Multivariate analysis revealed that LCI is an independent factor associated with SDR (hazard ratio, 1.990; 95% confidence interval, 1.203-3.293; P = .007), along with withdrawal time (hazard ratio, 1.157; 95% confidence interval, 1.060-1.263; P = .001) and operator experience (hazard ratio, 1.850; 95% confidence interval, 1.045-3.273; P = .035). CONCLUSIONS: LCI is significantly superior to WLI for SSL detection, and may improve polyp and adenoma detection. LCI can be recommended as an appropriate method for routine inspection during colonoscopy (http://www.chictr.org.cn number, ChiCTR2000035705).

Comparison Between Preincision Traction and On-Demand Traction in Assisting Colorectal Endoscopic Submucosal Dissection.

INTRODUCTION: Adequate exposure of the dissection site is very important for colorectal endoscopic submucosal dissection (ESD). We aimed to investigate the safety and efficacy of the preincision traction (PIT) method using an internal clip-with-spring device in comparison with the conventional on-demand traction (ODT) method in assisting colorectal ESD. METHODS: This was a prospective nested case-control study. A total of 26 patients for PIT-ESD and other 26 patients for ODT-ESD were involved. Data on clinical characteristics and therapeutic outcomes were collected and analyzed. RESULTS: The en bloc resection rate (both 100%) and curative resection rate (92.3% vs 96.2%) showed no significant difference between the 2 groups. Compared with ODT-ESD, PIT-ESD significantly reduced the procedure time (29.8 ± 18.4 vs 57.4 ± 33.7 minutes, P = 0.001) and submucosal injection volume (49.6 ± 32.3 vs 70.8 ± 37.6 mL, P = 0.034), decreased the rate of intraoperative bleeding (26.9% vs 57.7%, P = 0.025) and muscular injury (7.7% vs 34.6%, P = 0.038), and shortened the postoperative hospital stay (1.8 ± 0.8 vs 2.5 ± 1.2, P = 0.015). DISCUSSION: The PIT method could significantly improve the safety and efficacy of colorectal ESD.

Colchicine improves severe acute pancreatitis-induced acute lung injury by suppressing inflammation, apoptosis and oxidative stress in rats.

BACKGROUND: Inflammation, apoptosis and oxidative stress contribute to the development of severe acute pancreatitis-associated acute lung injury (SAP-ALI). Currently, there is no curative treatment for SAP-ALI in the clinic. This study investigated the potential therapeutic role and mechanisms of colchicine in a rat model of SAP-ALI. METHODS: Male Sprague-Dawley rats were randomized and administrated intragastrically with vehicle saline or colchicine (0.5 mg/kg/day) for seven days, followed by injecting sodium taurocholate to induce SAP-ALI. Together with a healthy control group of rats, their pancreatic and lung tissues and plasma samples were collected for histology, enzyme-linked immunosorbent assay (ELISA), immunoblot, immunohistochemistry, and immunofluorescence. RESULTS: Compared with the sham controls, the SAP group of rats with vehicle saline treatment displayed severe damages, inflammation with many neutrophil and macrophage infiltrates in pancreatic and lung tissues, accompanied by elevated levels of plasma interleukin-1ß (IL-1ß), IL-6 and tumor necrosis factor (TNF)-α, which were significantly mitigated in colchicine-treated SAP + COL group of rats. Furthermore, colchicine treatment significantly attenuated nuclear factor kappa-B (NF-κB)-p65, signal transducer and activator of transcription 3 (STAT3) and protein kinase B (AKT) phosphorylation, reduced inducible nitric oxide synthase (iNOS) and 4-Hydroxynonenal expression, ROS production and cell apoptosis by decreasing caspase-3 cleavage, Bax expression, but increasing Bcl-2, nuclear factor erythroid 2-related factor 2 (Nrf2) and heme oxygenase-1 (HO-1) expression in pancreatic and lung tissues, relative to the SAP group of rats. CONCLUSION: Colchicine treatment significantly mitigated the severity of SAP-ALI by inhibiting inflammation, oxidative stress and cell apoptosis in rats.