Objective Observation on the characteristics of choroidal melanomas with indocyanine green angiography (ICGA) and fundus fluorescsin angiography(FFA). Methods Both ICGA and FFA were used in 16 cases of choroidal melanoma for comparison and analysis. Results 81.2% of tumors showed hypofluorescence all the way or faint fluorescence in later stage．62.6% of tumors had characteristic intrinsic tumor vassels with ICGA,while 12.5% of tumors had intrinsic vessels with FFA．Those tumors that can't be diagnosed owing to whole hyperfluorescence in later stage with FFA may be diagnosed by visibility of intrinsic tumor vessels with ICGA. Conclusion ICGA is helpful in the diagnosis of choroidal melanoma. (Chin J Ocul Fundus Dis, 2000，16：3-5)
【摘要】目的探讨肝血管平滑肌脂肪瘤的临床病理特点、诊断及鉴别诊断。 方法对3例肝血管平滑肌脂肪瘤患者有关病理检查结果进行回顾性分析。 结果肿瘤位于肝右叶2例，肝左叶1例。肿瘤直径为2～10 cm，平均6.2 cm。3例肿瘤内均见平滑肌、脂肪、畸形厚壁血管，但未见髓外造血灶。对黑色素瘤（HMB45）、结合蛋白（desmin)及肌动蛋白（actin)检查均呈阳性反应。术后随访6～36个月，未见肿瘤复发。结论肝血管平滑肌脂肪瘤由3种成分组成，病理形态变化多样，必须与多种肝肿瘤相鉴别。平滑肌细胞HMB45表达呈强阳性反应是诊断肝血管平滑肌脂肪瘤较可靠的依据。
In order to explore the histochemical changes in retina after intravitreal injection of gentamycin,a histochemical quantitative analysis of cytochrome oxidase(CYO)and acetylcholinesterase(ACHE)was performed with a computerized image analysis system and was compared with that of morphological study.The results showed that CYO decreased significantly in 100mu;g dosage group.With increasing intravitreal gentamycin dosage or observed days,CYO decreased gradually in all rabbits.In 100~500mu;g dosage groups,ACHE changed mildly at 3 days of injection.It decreased significantly at 7 days.However,it was destroyed completely in 1000~3000mu;g dosage groups at 3 days. （Chin J Ocul Fundus Dis,1994,10:232-235）
Objective To evaluate the application value of scanning laser angiography with a wide-field contact lens system in the diagnosis of choroidal melanoma. Methods Twenty-four patients with choroidal melanoma were randomly divided into two groups, who underwent fundus fluorescein angiography and indocyanine green angiography scanning with the wide-field contact and non-contact lens system respectively in order to acquire the 150deg;wide-field and 30deg;view image data. The quality of the images was comprehensively evaluated. Results Satisfying images were acquired from all of the 24 patients. Widefield contact lens system indicated the accurate adjacent relation between the lesion position and the other dissection mechanisms, and also provided the general information about the size of the tumor and the perfusion of fluorescien or indocyanine green in the blood vessels. At the same time, it enlarged the view scope 3-5 times, which make for the screening of the peripheral lesions. Conclusions Scanning laser angiography with a wide-field contact lens system has important application value in the diagnosis of choroidal melanoma. (Chin J Ocul Fundus Dis, 2006, 22: 166-169)
ObjectiveTo investigate the impact of L-Phenylalanine on the efficiency of retinal pigment epithelial (RPE) cell derivation from human embryonic stem cells (hESCs) and explore the underlying mechanisms. MethodsH1 hESCs were routinely cultured with mTeSR medium and divided into control and experimental groups. When cells reached over-confluence, spontaneous differentiation was triggered using 10% KSR differentiation medium without bFGF. L-Phenylalanine (0.2 mmol/L) was supplemented in the experimental group from the 3rd week. The expression of RPE markers and Wnt signaling components in the two groups was detected by Real time-RCR, Western blot and Flow cytometry analyses. Purified hESC-RPE cells and PBS were injected into the subretinal space of sodium iodine-induced retinal degeneration rats separately. Retinal function was assessed by ERG 6 weeks after the transplantation. ResultsOn the 7th week, much more pigment cell clumps appeared in the experimental group compared to the control group. Within these areas there were monolayer hexagonal RPE cells full of pigment granules. The experimental group showed significantly higher expression of Pax6, MITF, Tyrosinase, RPE65, Wnt3a, Lef1 and Tcf7 genes than the control group (P < 0.01). Higher expression level of MITF and RPE65 proteins and higher percentage of RPE65 (+) cells (P < 0.01) were detected in the experimental group. 6 weeks after sub-retinal transplantation of hESC-RPE cells, the amplitudes of a-b wave in the transplanted eyes were significantly higher than those in the control eyes (P < 0.01) at the stimulus intensity of 3.0 cd·s/m2. ConclusionsL-Phenylalanine effectively promoted the differentiation of embryonic stem cells into retinal pigment epithelial cells, and its impacts on the Wnt/β-catenin signaling pathway may partially explain the underlying mechanisms. Subretinal transplantation of hESC-RPE remarkably improved the retinal functions of retinal degenerative animal models.
Ｃｈｏｌｅｄｏｃｈｏｊｅｊｕｎａｌ ｓｈｕｎｔ ｗａｓ ｐｅｒｆｏｒｍｅｄ ｉｎ ｒａｂｂｉｔｓ ｂｙ ｉｎｓｅｒｔｉｎｇ ｔｕｂｅｓ ｏｆ ｄｉｆｆｅｒｅｎｔ ｃａｌｉｂｒｅ ｉｎｔｏ ｔｈｅ ｈｅｐａｔｉｃ ｄｕｃｔ ａｎｄ ｐｒｏｘｉｍａｌ ｊｅｊｕｎｕｍ ｓｅｐａｒａｔｅｌｙ ｗｉｔｈ ｌｉｇａｔｉｏｎ ｏｆ ｃｏｍｍｏｎ ｂｉｌｅ ｄｕｃｔ ａｎｄ ｃｏｎｎｅｃｔｉｎｇ ｔｗｏ ｔｕｂｅｓ ｕｎｄｅｒ ｔｈｅ ｓｋｉｎ ｏｆ ａｂｄｏｍｉｎａｌ ｗａｌｌ ｆｏｒ ｓｕｂｓｅｑｕｅｎｔ ｃｏｌｌｅｃｔｉｏｎｓ ｏｆ ｂｉｌｅ ｔｏ ｄｅｔｅｃｔ ｔｈｅ ｉｍｍｕｎｅ ｃｏｍｐｌｅｘ．Ｔｈｅ ｃｏｎｓｅｃｕｔｉｖｅ ｏｂｓｅｒｖａｔｉｏｎ ｄｅｍｏｎｓｔｒａｔｅｄ ａ ｒｅｇｕｌａｒｉｔｙ ｏｆ ｉｍｍｕｎｅ ｃｏｍｐｌｅｘ ｉｎ ｂｉｌｅ ｉｎｃｒｅａｓｉｎｇ ｆｒｏｍ ｔｈｅ ｌｏｗｅｒ ｔｏ ｔｈｅ ｈｉｇｈｅｒ ｌｅｖｅｌ ｉｎ ｔｈｅ ｐｒｏｃｅｓｓ ｏｆ ｆｏｒｍａｔｉｏｎ ｏｆ ｐｉｇｍｅｎｔａｌ ｓｔｏｎｅ．
Purpose To observe the expression of proliferating cell nuclear antigen（PCNA）and bcl-2 of cultured human retinal pigment epithelial cells（RPE）． Methods SABC techniques were applied for immunocytochemical staining of cultured RPE with mouse anti-human PCNA monoclonal antibody and rabbit antihuman bcl-2 antibodies． Results 31.2% and 50.6% cultured cells were positive to anti-human PCNA at 24h and 48h after seeding，respectively．The positive staining was mottled in the nucleus．positive staining for bcl was seen in 76%to 90% cells as fine granules scattered within the cytoplasm. Conclusion One half of cultured RPE expressed PCNA，indicating that the cells were in phase S of the cell cycle．Positive staining for bcl-2 appeared in much more RPE cells．These biological markers may be associated with the growth activity of cultured RPE． (Chin J Ocul Fundus Dis,1998,14:26-28)