摘要目的:探讨白细胞共同抗原相关磷酸酶受体(LAR)在大鼠视觉可塑性调控中的作用。方法:选取初生Wistar大鼠40只，按照随机数字表法分为5个组，每组8只，分别于出生后1、3、5、7和9周各处死一组幼鼠。另选取32只10周龄健康清洁级成年Wistar大鼠32只，按照随机数字表法分为正常对照组、双眼形觉剥夺(BFD)组、氟西汀组和BFD＋氟西汀组，每组8只。正常对照组大鼠不做任何干预，其余各组根据分组分别进行双眼眼睑缝合2周和/或0.2 mg/ml氟西汀无菌水溶液喂养4周。采用免疫荧光法观察各组大鼠视皮层LAR和硫酸软骨素多糖(CSPGs)的表达分布，采用Western blot法检测各组大鼠视皮层LAR表达量。结果:大鼠视皮层LAR表达分布于细胞膜、细胞质及轴突，CSPGs表达分布于细胞间质；大鼠视皮层LAR和CSPGs荧光强度随周龄的增大出现增强的趋势。出生后1、3、5、7、9周大鼠视皮层LAR蛋白相对表达量分别为(100.00±3.20)%、(108.37±2.26)%、(113.69±2.33)%、(131.83±3.78)%和(140.11±4.02)%，总体比较差异有统计学意义( F＝31.70， P＝0.001)。大鼠视皮层LAR蛋白的相对表达量随视觉发育周龄的增大而逐渐增加(标准化 β＝0.961， P＝0.007)。正常对照组成年大鼠视皮层LAR荧光强度最强，氟西汀组、BFD组和BFD＋氟西汀组视皮层LAR荧光强度显著下降。正常对照组、氟西汀组、BFD组和BFD＋氟西汀组大鼠视皮层LAR蛋白相对表达量分别为(100.00±2.96)%、(81.02±2.77)%、(71.99±3.09)%和(52.90±2.01)%，总体比较差异有统计学意义( F＝18.16， P＝0.015)，其中氟西汀组、BFD组及BFD＋氟西汀组LAR蛋白相对表达量均较正常对照组明显下降，差异均有统计学意义( t＝31.30、36.10、41.72，均 P<0.01)。 结论:视皮层LAR可能作为CSPGs特异性受体参与视觉可塑性的调控。

abstractsObjective:To investigate the effects of leukocyte common antigen-related phosphatase receptor (LAR) on the regulation of visual plasticity in rats.Methods:Fourty newborn Wistar rats were randomly divided into 5 groups, with 8 rats in each group, and were executed at 1 week, 3, 5, 7 and 9 weeks postnatal, respectively.Thirty-two healthy and 10-week-old Wistar rats were randomly divided into a normal control group, a fluoxetine group, a binocular form deprivation (BFD) group and a BFD+ fluoxetine group, with 8 rats in each group.Rats in the fluoxetine group drinked water with the dosage of 0.2 mg/ml fluoxetine for 4 weeks.The rats in the BFD group received eyelids suture for 2 weeks to form BFD model.And the combination of fluoxetine administration and BFD was performed in the BFD+ Fluoxetine group.No intervention was conducted in the normal control group.The expressions of LAR and chondroitin sulfate proteoglycans (CSPGs) were detected by immunofluorescence.The expression of LAR in the visual cortex of rats was detected by Western blot.Results:LAR was distributed in the cell membrane, plasma and axon.CSPGs were distributed in the intercellular substance in visual cortex of rats.The fluorescence intensities of LAR and CSPGs increased with the postnatal development.The relative expression of LAR was (100.00±3.20)%, (108.37±2.26)%, (113.69±2.33)%, (131.83±3.78)% and (140.11 ±4.02)% at 1 week, 3, 5, 7 and 9 weeks postnatal, respectively, the difference was statistically significant ( F=31.70, P=0.001). The relative expression of LAR was increased according to the growth of age ( β=0.961, P=0.007). The relative expression of LAR was(100.00±2.96)%, (81.02±2.77)%, (71.99±3.09)% and (52.90±2.01)% in the normal control group, fluoxetine group, BFD group and fluoxetine+ BFD group, respectively, with a significantly difference among the groups ( F=18.16, P=0.015), the relative expressions of LAR protein in the fluoxetine group, BFD group and BFD+ fluoxetine group were significantly lower than that in the normal control group ( t=31.30, 36.10, 41.72; all at P<0.01). Conclusions:LAR may be involved in the regulation of visual plasticity as a specific receptor of CSPGs.