Authors: Xie Laiqing, Xu Guoxu, Ni Yong, Zhang Ji, Ji Xiaoyan, Lou Hui, Song E
Abstract [View PDF] [Read Full Text]
To investigate the effects of leukocyte common antigen-related phosphatase receptor (LAR) on the regulation of visual plasticity in rats.
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.
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).
LAR may be involved in the regulation of visual plasticity as a specific receptor of CSPGs.