ABSTRACT
·AIM:To investigate the effects and mechanism of miR-138 in mediating the antioxidant function of lens epithelial cells affected by age-related cataracts. ·METHODS:Real-time quantitative PCR(RT-qPCR) was used to detect miR-138 expression in the anterior lens capsules of healthy people, the anterior lens capsules of patients with age-related cataracts, and human epithelial cell line (SRA01/04) cells exposed to oxidative stress. A 2',7'-dichloro-fluorescein diacetate (DCFH-DA) probe was used to measure the levels of endogenous reactive oxygen species (ROS) in human lens epithelial cells (hLECs) exposed to 400μ mol/L H2O2for 1h. SRA01/04 cells were transfected with either miR-138 mimics,mimic controls, miR-138 inhibitors or inhibitor controls. After 72h,these cells were exposed to 400μ mol/L H2O2for 1h, then p53 and Bax mRNA expression were measured using RT-qPCR. Expression of p53 and Bax protein were also measured by western blotting analysis. Finally, cell viability was assessed using an MTS assay. ·RESULTS: Compared to the control group, expression of miR-138 in the anterior lens capsules of age-related cataract patients and in SRA01/04 cells exposed to oxidative stress significantly increased (P<0.001). Levels of endogenous ROS were significantly elevated in hLECs exposed to oxidative stress (P<0.001). Compared to the mimic control group, the hLECs in the miR-138 mimic group expressed significantly higher levels of p53 and Bax mRNA and protein while cell viability was significantly reduced(P<0.001). Conversely, p53 and Bax mRNA and protein expression were significantly reduced in the miR-138 inhibitor group as compared to the control group, while the cells in this group had much higher levels of cell viability (P<0.001). · CONCLUSION: The expression of miR - 138 is upregulated in the anterior lens capsules of age-related cataract patients. MiR-138 decreases the anti-oxidative stress capacity of lens epithelial cells by upregulating p53 and Bax, while inhibiting cell proliferation and repair. This finding suggests that miR-138 may play a key role in the development of age-related cataracts.
ABSTRACT
? AlM: To investigate age - related cataract and its postoperative dominant eye changes and visual quality of patients. ?METHODS: Totally 102 patients ( 204 eyes ) with age-related cataract in our hospital from January 2013 to November 2014 were selected, and according to preoperative best corrected visual acuity ( BCVA ) were divided into two groups, in which the both eyes BCVA difference ≥2 lines ( 78 cases, 156 eyes ) was group A, and both eyes BCVA difference ≤1 line ( 24 cases, 48 eyes ) was group B. Dominant eyes were detected preoperatively and at postoperative 1 and 3mo. Contrast sensitivity and investigated visual satisfaction were tested. ?RESULTS: Preoperative dominant eye corrected visual acuity was 0. 34 ± 0. 11, significantly higher than that of the non-dominant eye (0. 15 ± 0. 09), and there was statistically significant difference ( P 0. 05 ); At postoperative 3mo, 17 cases in the group A had dominant eye changes, and change rate was 21. 79% (17/78). At postoperative 3mo, the dominant eye change rate in the group B was 20. 83% (5/24), and there was no statistical significant difference between the two groups ( P > 0. 05 ). The dominant eye change group and non- change groups patients with different spatial frequency contrast sensitivity test showed no statistical significance ( P >0. 05 ), Postoperative 3mo after operationvisual satisfaction questionnaire display, score of group A was (91. 35±10. 26) points, score of group B was (90. 15±9. 75) points (P>0. 05), the dominant eye change group score was (90. 08±9. 77) points, score non-change group was (91. 43±10. 22) points (P>0. 05). ?CONCLUSlON: The dominant eye changes exist in postoperative eyes with age-related cataract, but there is no effect on visual quality.