ABSTRACT
Introduction: In order to better understand the role of hsa-miR-15a in the pathogenesis of
age-related cataracts, we hypothesised altered expression, and of target anti-apoptotic genes,
BCL-2 and MCL-1, in lens epithelial cells amongst age-related cataract patients.
Material and methods: Reverse transcription quantitative polymerase chain reaction (RTqPCR)
quantified the expression of hsa-miR-15a and the target genes BCL-2 and MCL-1 in lens
epithelial cells of 120 age-related cataract patients (40 patients with cortical cataracts, 40
patients with nuclear cataracts and 40 patients with posterior subcapsular cataracts) and 40
controls. Sixty specimens (15 normal and 45 cataracts) were stained immunohistochemically
with BCL-2 and MCL-1 markers.
Results: The expression of hsa-miR-15a was significantly increased (p = 0.003) in lens epithelial
cells of cataract patients compared to the control group. BCL-2 and MCL-1 expression levels were
significantly decreased in cataract patients (p < 0.001). A significant increase in hsa-miR-15a
expression in the cortical subtype compared to the posterior subcapsular subtype (p = 0.003) and
a significant decrease in BCL-2 and MCL-1 expressions in the cortical subtype compared to the
nuclear and the posterior subcapsular subtype was detected.
Conclusions: The increased expression of hsa-miR-15a in lens epithelial cells of cataract
patients may repress the expression of BCL-2 and MCL-1. The expression of hsa-miR-15a
and the subsequent apoptosis of lens epithelial cells are part of the pathogenesis of agerelated
cataracts.