丙烯醛诱导大鼠脉络膜新生血管的形成

目的：：探讨丙烯醛( AC)诱导大鼠脉络膜新生血管( CNV)的形成。方法：选取远交群大鼠( SD)12只,随机将大鼠分为三组,即空白组,AC诱导4wk组和AC诱导8wk组,其中空白对照组每日200μL新鲜自来水灌胃,实验组为200μL AC溶液(2.5 mg/kg/d)每日灌胃,分为诱导4wk组和8wk组,取材后视网膜组织石蜡包埋,切片及HE染色。结果：空白对照组及AC诱导4 wk组均见RPE-Bruch膜连续性完整,未见明显异常；AC 诱导8 wk 组发现 RPE-Bruch膜连续性缺失,脉络膜新生血管长入视网膜神经上皮层内。结论：长期使用AC可以诱导大鼠脉络膜新生血管形成。     

Protective effects of lipoic acid-niacin dimers against blue light-induced oxidative damage to retinal pigment epithelium cells

AIM: To evaluate the protective effects of lipoic acid-niacin (N2L) dimers against blue light (BL)-induced oxidative damage to human retinal pigment epithelium (hRPE) cells in vitro. METHODS: hRPE cells were divided into a control group (CG), a BL group, an N2L plus BL irradiation group, an α-lipoic acid (ALA) plus BL group, an ALA-only group, and an N2L-only group. hRPE cellular viability was detected by performing 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium (MTT) bromide assays, and apoptosis was evaluated by annexin-V-PE/7-AAD staining followed by flow cytometry. Ultrastructural changes in subcellular organelles were observed by transmission electron microscopy. Reactive oxygen species formation was assayed by flow cytometry. The expression levels of the apoptosis-related proteins BCL-2 associated X protein (BAX), B-cell leukmia/lymphoma 2 (BCL-2), and caspase-3 were quantified by Western blot analysis. RESULTS: BL exposure with a light density of 4±0.5 mW/cm2 exceeding 6h caused hRPE toxicity, whereas treatment with a high dose of N2L (100 mol/L) or ALA (150 mol/L) maintained cell viability at control levels. BL exposure caused vacuole-like degeneration, mitochondrial swelling, and reduced microvillus formation; however, a high dose of N2L or ALA maintained the ultrastructure of hRPE cells and their organelles. High doses of N2L and ALA also protected hRPE cells from BL-induced apoptosis, which was confirmed by Western blot analysis: BCL-2 expression significantly increased, while BAX and caspase-3 expression slightly decreased compared to the CG. CONCLUSION: High-dose N2L treatment (>100 mol/L) can reduce oxidative damage in degenerating hRPE cells exposed to BL with an efficacy similar to ALA.     

Protection of tight junction between RPE cells with tissue factor targeting peptide

AIM: To investigate the effect of tissue factor targeting peptide (TF-TP) on retinal pigment epithelium (RPE) cells tight junctions. METHODS: Cell counting kit-8 (CCK-8) was used to measure the proliferation of ARPE-19 cells. Expression of tight junction, ZO-1 in ARPE-19 cells was measured by Western blot and immunofluorescent staining. Western blot was also used to detect the expression of tissue factor (TF). CEC Transmigration Assay was used to measure the migration of ARPE-19 cells. The transport of fluorescent markers [fluorescein isothiocyanate dextrans of 4, 10, 20 (FD4, FD10, FD20)] and the transepithelial electrical resistance (TEER) were used to measure in ARPE-19 cell. RESULTS: CCK-8 assay showed that 5 μmol/L TF-TP can inhibit ARPE-19 cells abnormally proliferation stimulated by lipopolysaccharide (LPS; P<0.05). LPS increased the transport of fluorescent markers (FD4, FD10, FD20) and decreased TEER levels in ARPE-19 cells, respectively, which were prevented by 5 μmol/L TF-TP pretreatment (P<0.05). Furthermore, LPS significantly up-regulated the expression of TF and downregulated the expression of ZO-1 (P<0.05) in ARPE-19 cell which was inhibited by the TF-TP (P<0.05). In addition, TF-TP inhibited the abnormal migration induced by LPS in ARPE-19 cell (P<0.05). CONCLUSION: Our findings suggest that TF-TP suppressed proliferation and migration of ARPE-19 cells induced by LPS, and maintained the RPE tight junctions through inhibition of TF expression and increased expression of ZO-1.     

PRP对DR患者视网膜血液循环时间及血流动力学的影响

目的：分析全视网膜激光光凝(PRP)手术对糖尿病视网膜病变(DR)患者视网膜动静脉循环时间及血流动力学的影响，为临床治疗提供参考。

方法：选取2013-05/2018-02期间在本院接受PRP治疗的DR患者80例80眼。分别于治疗前和治疗后3mo使用眼底荧光造影系统记录视网膜静脉分支主干发生层流时间和全部充盈时间(V1和V2)、视网膜动脉分支主干显影时间和全部充盈时间(A1和A2)，并计算视网膜动静脉经过时间(V2-A1)、视网膜动脉经过时间(A2-A1)、视网膜静脉经过时间(V2-V1)及视网膜毛细血管经过时间(V1-A2)； 使用全自动生化分析仪检测红细胞聚集指数、血细胞压积、血浆粘度、全血粘度高切及全血粘度低切； 使用彩色多普勒超声诊断仪记录眼动脉阻力指数(RI)、收缩期最大血流速度(PSV)和舒张末期血流速度(EDV)。

结果：治疗后3mo，本组患者V1-A2时间较治疗前显著延长，红细胞聚集指数、血细胞压积、血浆粘度、全血粘度高切及全血粘度低切较治疗前显著降低，RI较治疗前显著降低，EDV、PSV较治疗前显著升高，差异均有统计学意义(P<0.05)。

结论：PRP手术对DR患者视网膜动静脉循环时间及血流动力学均会产生一定的影响，对视网膜毛细血管经过时间的影响较明显。