直肌移植优化术在难治性单眼上转不足中的应用

目的:初步探讨直肌移植优化术在伴有下直肌限制且原在位垂直斜视度较大由双上转肌麻痹导致的难治性单眼上转不足中的应用。方法:回顾性分析本院2015-01/2019-01收治的双上转肌麻痹病例6例6眼,经保守治疗无效后采用直肌移植优化术,观察术前与术后眼位、垂直斜视度、麻痹眼上下转的运动功能以及假性上睑下垂和代偿头位的改善情况。结果:患者6例解除下直肌限制后行直肌移植优化术,术前,术后1、6mo的原在位垂直斜视度分别是49.83±6.55、2.67±2.07、1.83±2.40PD,术前斜视度与术后1、6mo比较均有差异(P<0.001),术后1mo与6mo垂直斜视度比较无差异(P=0.899)。所有患者术后原在位眼位均正位,麻痹眼上转功能显著改善;术前4例假性上睑下垂和2例有代偿头位者,术后假性上睑下垂和代偿头位基本消失。结论:直肌移植优化术适合伴有下直肌限制的单眼上转不足,可有效改善患眼的上转功能且疗效稳定。

Improved method for inducing chronic atrophic gastritis in mice

BACKGROUND Chronic atrophic gastritis(CAG)is a common disease of the digestive system with pathological characteristics of a decreasing number,or disappearance,of inherent glands of the gastric mucosa.CAG has been defined as a precancerous condition of gastric cancer.Intestinal metaplasia or intraepithelial neoplasia accompanying atrophied glands of the stomach is regarded as one of the most important precancerous lesions of gastric cancer.As a common malignant tumour,gastric cancer remains without a satisfactory therapy and its pathogenesis remains unclear,seriously threatening human life.Therefore,some scholars have proposed to prevent the incidence of gastric cancer by avoiding precancerous lesions.If CAG can be reversed,the incidence of gastric cancer can be substantially reduced.To reverse and prevent CAG and study its pathogenesis and therapy,it is necessary to develop an ideal,safe,stable,animal model.AIM To study a rapid,stable,and safe method of establishing a mouse model of human CAG.METHODS Six-week-old Kunming mice were divided into a phosphate buffered solution control group,a Helicobacter pylori(H.pylori)group,an N-methyl-N'-nitroguanidine(MNNG)group,an ammonia water group,and a group combining H.pylori,MNNG,and ammonia water(hereinafter referred to as the combined group).The mice were administrated with drinking water containing ammonia or infected with H.pylori through gavage.At the 30th,60th,90th,and 120th day after the last H.pylori infection,mice were selected randomly to collect their gastric mucosa for hematoxylin eosin staining,terminal nick-end labelling staining detection,and immunohistochemical staining for Bax and Bcl-2.In addition,H.pylori was isolated,cultured,and identified,and its extent of colonisation calculated.Blood was collected to detect inflammatory factors interleukin(IL)-1β,IL-8,and tumor necrosis factor(TNF)-αand immune function markers CD4 and CD8 to confirm successful establishment of the CAG model.RESULTS The combined group showed slight CAG at the 90th day and moderate CAG at the 120th day,while other groups did not show CAG at that time.CONCLUSION The combination of H.pylori,MNNG,and ammonia is an effective method of developing a mouse model of human CAG.

Mechanism of combined use of vitamin D and puerarin in anti-hepatic fibrosis by regulating the Wnt/β-catenin signalling pathway

AIM To reveal the protective mechanism of the combined use of vitamin D and puerarin in the progression of hepatic fibrosis induced by carbon tetrachloride(CCl4).METHODS Eight-week-old male Wistar rats were randomly divided into a normal control group(C group), a CCl4 group(CCl4 group), a vitamin D group(V group), a puerarin group(P group), and a combined group of vitamin D and puerarin(V + P group), each of which contained ten rats. In this way, we built a rat model of CCl4-induced hepatic fibrosis with intervention by vitamin D, puerarin, or a combination of the two. After eight weeks, the mice were sacrificed to collect serum and liver specimens. Blood was collected to detect the hyaluronic acid(HA). We also measured hydroxyproline(Hyp) and prepared paraffin sections of liver. After Sirius red staining, the liver specimens were observed under a microscope. RT-PCR and western blot analysis were adopted to detect the mRNA and the proteinlevels of Collagen I, Collagen III, Wnt1, and β-catenin in the liver tissues, respectively.RESULTS Hepatic fibrosis was observed in the CCl4 group. In comparison, hepatic fibrosis was attenuated in the V, P, and V + P groups: the HA level in blood and the Hyp level in liver were reduced, and the mRNA levels of Collagen I, Collagen III, Wnt, and β-catenin in liver were also decreased, as well as the protein levels of Wnt1 and β-catenin. Among these groups, the V + P group demonstrated the greatest amelioration of hepatic fibrosis.CONCLUSION The combined application of vitamin D and puerarin is capable of alleviating CCl4-induced hepatic fibrosis of rats. As to the mechanism, it is probably because the combined use is able to silence the Wnt1/β-catenin pathway, suppress the activation of hepatic stellate cells, and reduce the secretion of collagen fibers, therefore improving the anti-hepatic fibrosis effect.

Comparison of three fluorescence labeling and tracking methods of endothelial progenitor cells in laser-injured retina

AIM： To compare three kinds of fluorescent probes for in vitro labeling and in vivo tracking of endothelial progenitor cells（EPCs） in a mouse model of laser-induced retinal injury.METHODS： EPCs were isolated from human umbilical cord blood mononuclear cells and labeled with three different fluorescent probes： 5-（and-6）-carboxyfluorescein diacetate succinimidyl ester（CFSE）, 1,1′-dilinoleyl-3,3,3′,3′-tetramethylindo-carbocyanine perchlorate linked acetylated low-density lipoprotein（Di I-Ac LDL）, and green fluorescent protein（GFP）. The fluorescent intensity of EPCs was examined by confocal microscopy. Survival rate of labeled EPCs was calculated with trypan blue staining, and their adhesive capability was assessed. A mouse model of retinal injury was induced by laser, and EPCs were injected into the vitreous cavity. Frozen section and fluorescein angiography on flat-mounted retinal samples was employed to track the labeled EPCs in vivo.RESULTS： EPCs labeled with CFSE and Di I-Ac LDL exhibited an intense green and red fluorescence at the beginning; the fluorescence intensity decreased gradually to 20.23% and 49.99% respectively, after 28 d. On the contrary, the florescent intensity of GFP-labeled EPCs increased in a time-dependent manner. All labeled EPCs showed normal morphology and no significant change in survival and adhesive capability. In the mouse model, transplantation of EPCs showed a protective effect against retinal injury. EPCs labeled with CFSE and Di I-Ac LDL were successfully tracked in mice during the development of retinal injury and repair; however, GFP-labeled EPCs were not detected in the laser-injured mouse retina.CONCLUSION： The three fluorescent markers used in this study have their own set of advantages and disadvantages. CFSE and Di I-Ac LDL are suitable for short-term EPClabeling, while GFP should be used for long-term labeling. The choice of fluorescent markers should be guided by the purpose of the study.

Development of a new choroidal metastasis in resistance to crizotinib therapy in anaplastic lymphoma kinaserearranged non-small cell lung cancer

INTRODUCTION Non-small cell lung cancer（NSCLC）is a common malignant disease with an extremely poor prognosis.Lung cancer has been reported to metastasize to the eye in 0.2%to7%of patients based on clinical studies,and in 6%to 7%of patients based on postmortem histopathologic studies.