BACKGROUND:Treatment methods of pterygium mainly include pterygium excision,pterygium excision combined with local application of mitomycin,pterygium excision combined with conjunctival flap transfusion and pterygium excision combined with autologous corneal limbus stem cell transplantation.Dry eye commonly occurred in many patients following pterygium excision.OBJECTIVE:To evaluate the effects of stem cell transplantation of limbus cornea and simple excision of pterygium on tear film stability.METHODS:Eighty patients(eighty eyes)with pterygium were involved in this clinical experiment.All patients were randomly divided into 2 groups:Group A accepted simple excision of pterygium in 40 patients with 40 eyes under a 10-fold microscope,and Group B accepted excision of pterygium with stem cell transplantation of limbus cornea in 40 patients with 40 eyes under a 10-fold microscope,in which a free transplantation of the superotemporal limbus stem with an adjacent piece of conjunctiva was transplanted in the excision area.Slit-lamp examination,tear film break-up time and questionnaire on dry eye were performed before operation,at one week post-operation,and at three months post-operation.RESULTS AND CONCLUSION:In both groups,following surgery,some patients affected dryness,foreign body sensation,burning sensation.These symptoms were more in the group A compared with group B(P ＜ 0.05).Implant was red 1 week following surgery in the group B,and confluence was found,without infection or rejection.The tear film break-up time was prolonged in the group B compared with the group A at 1 week following surgery,and no significant difference was determined at 3 months.Results indicated that compared with simple excision of pterygium,combined excision of pterygium with stem cell transplantation of limbus cornea obtained better outcomes,and could decrease the manifestations of dry eye and maintain better tear film stability in patients with pterygium.

Objective To observe the effects of Curcumin on the cellular apoptosis of rat retinal vascular endothelial cells (RRVEC) induced by high glucose. Methods Generation 4 cultured RRVEC were used in this experiment, and identified with anti-vWF factor antibody by immunochemistry and immunofluorescence. The RRVEC were divided into control group (5.5 mmol/L glucose), high glucose group (30 mmol/L glucose), and treatment group (30 mmol/L glucose+30 μmol/L Curcumin), respectively. Flow cytometry was used to measure the cellular reactive oxygen species (ROS) level and apoptosis. The expression intensity and location of nuclear factor (NF)-κB p65 in the cells of the three groups were detected by immunochemistory. The expression of Bcl-2 and Bax protein was detected by Western blot test. Results Immunostaining showed that RRVEC were positive for vWF factor. The flow cytometry showed that the cellular ROS level in treatment group was higher than that in the control group (t=8.677, P=0.000), but less than that in the high glucose group (t=40.957, P=0.000). Compared with the high glucose group, the cellular ROS level in the treatment group was decreased significantly (t=6.568, P=0.000). The cellular apoptosis were significantly different among the three groups (F=325.137, P=0.000). Compared with the high glucose group, the cellular apoptosis in the treatment group was decreased significantly (t=12.818, P=0.000). Immunochemistry showed that NF-κB p65 was expressed strongly in the cellular nuclei and cytoplasm in the high glucose group than that in the control group and the treatment group with the significant differences (t=8.322, P=0.000). Western blot results demonstrated that compared with the control group, the expression of Bcl-2 of RRVEC and Bcl-2/Bax ratio decreased (t=4.362, 6.449; P=0.005, 0.001) and Bax increased (t=3.813, P=0.009)in the high glucose group, with statistically significant differences. Compared with the high glucose group, the expression of NF-κB and Bax decreased (t=2.577, 3.059; P=0.042, 0.022) and Bcl-2/Bax ratio increased significantly (t=3.831, P=0.009) in the treatment group. Conclusion Curcumin could suppress the cellular apoptosis of RRVEC induced by high glucose. The mechanism of Curcumin protecting RRVEC may be via regulating NF-κB signal pathway.