Related Experiment Video
Updated: Mar 2, 2026
Characterization of Molecular Mechanisms of In vivo UVR Induced Cataract
Published on: November 28, 2012
Long Non-Coding RNA KCNQ1OT1 Promotes Cataractogenesis via miR-214 and Activation of the Caspase-1 Pathway
1Department of Ophthalmology, The First Affiliated Hospital of Harbin Medical University, Harbin, China.
Background/Aims:
KCNQ1OT1 regulates the expression of tissue-specific imprinted genes within the Kcnq1 domain. Imprinted genes are positive regulators of apoptosis, one of the forms of cell death related to cataract formation, and thus may provide novel therapeutic targets for cataract treatment. Here, we studied the role of non-coding RNAs(ncRNA) in cataract formation.
Methods:
Human lens epithelium cells (HLECs) were treated with H2O2, and the expression of KCNQ1OT1 and miR-214 was detected by qRT-PCR. The expression of caspase-1 was detected using qRT-PCR, western blot and immunostaining. To confirm our findings in cell cultures, we analysed KCNQ1OT1, miR-214, and caspase-1 expression in lens anterior capsules of both cataract patients and normal controls by qRT-PCR and western blot analysis.
Results:
We found that the expression of KCNQ1OT1 was increased in both human cataract lens anterior capsular samples and SRA01/04 cell lines treated with H2O2. Knockdown of KCNQ1OT1 expression significantly suppressed H2O2-induced SRA01/04 cell pyroptosis in vitro, which is the critical step in cataract formation. The expression of microRNA-214 (miR-214) was also decreased in cataract lens anterior capsular tissues and H2O2-induced SRA01/04 cell lines. Knockdown of KCNQ1OT1 significantly increased the expression of miR-214.
Conclusions:
We demonstrated for the first time that caspase-1 is a functional downstream target of miR-214, and knockdown of KCNQ1OT1 reduced the expression of caspase-1. These results provide evidence that the KCNQ1OT1-miR-214-caspase-1 regulatory network is a novel mechanism for promoting cataract formation.
Insights
The KCNQ1OT1-miR-214-caspase-1 pathway promotes cataract formation by regulating pyroptosis. Targeting this non-coding RNA network may offer new therapeutic strategies for treating cataracts.
Area of Science:
- Ophthalmology
- Molecular Biology
- Genetics
Background:
- Cataract formation is linked to apoptosis, regulated by imprinted genes.
- Non-coding RNAs (ncRNAs) play a role in cataract development.
- KCNQ1OT1 influences imprinted gene expression within the Kcnq1 domain.
Purpose of the Study:
- To investigate the role of ncRNAs, specifically KCNQ1OT1 and miR-214, in cataract formation.
- To elucidate the regulatory network involving KCNQ1OT1, miR-214, and caspase-1 in the context of cataracts.
Main Methods:
- Human lens epithelium cells (HLECs) were exposed to H2O2 to induce cataract-like changes.
- Quantitative real-time PCR (qRT-PCR) and western blot analysis were used to measure gene and protein expression.
- Expression levels of KCNQ1OT1, miR-214, and caspase-1 were analyzed in cell cultures and human cataract tissues.
Main Results:
- KCNQ1OT1 expression was elevated in cataract samples and H2O2-treated cells.
- Knockdown of KCNQ1OT1 suppressed H2O2-induced pyroptosis in HLECs.
- miR-214 expression was decreased in cataract tissues and H2O2-treated cells, and KCNQ1OT1 knockdown increased miR-214 levels.
Conclusions:
- Caspase-1 was identified as a downstream target of miR-214.
- The KCNQ1OT1-miR-214-caspase-1 axis represents a novel regulatory mechanism driving cataract formation.
- This pathway presents potential therapeutic targets for cataract treatment.
Related Concept Videos
02:39lncRNA - Long Non-coding RNAs
02:39lncRNA - Long Non-coding RNAs
01:20The Retinoblastoma Gene
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...