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Updated: Jun 2, 2026
Modeling Cataract Surgery in Mice
Published on: December 1, 2023
A complement receptor C5a antagonist regulates epithelial to mesenchymal transition and crystallin expression after
Rinako Suetsugu-Maki1, Nobuyasu Maki, Timothy P Fox
1Department of Biology and Center for Tissue Regeneration and Engineering at Dayton, University of Dayton, Dayton, OH 45469-2320, USA.
Purpose:
To evaluate the effects of complement employing a mouse model for secondary cataract.
Methods:
The role of complement receptor C5a (CD88) was evaluated after cataract surgery in mice. An antagonist specific to C5a receptor was administered intraperitoneally to mice. Epithelial to mesenchymal transition (EMT) was evaluated by alpha-smooth muscle actin (α-SMA) staining and proliferation by bromodeoxyuridine (5-bromo-2'-deoxyuridine, BrdU) incorporation. Gene expression patterns was examined by microarray analysis and quantitative polymerase chain reaction (QPCR).
Results:
We found that administration of a C5aR antagonist in C57BL/6J mice decreases EMT, as evidenced by α-SMA expression, and cell proliferation. Gene expression by microarray analysis reveals discreet steps of gene regulation in the two major stages that of EMT and lens fiber differentiation in vivo. A hallmark of the microarray analysis is that the antagonist seems to be a novel stage-specific regulator of crystallin genes. At week two, which is marked by lens fiber differentiation genes encoding 12 crystallins and 3 lens-specific structural proteins were severely down-regulated.
Conclusions:
These results suggest a possible therapeutic role of an antagonist to C5aR in preventing secondary cataracts after surgery. Also these results suggest that crystallin gene expression can be regulated by pro-inflammatory events in the eye.
Insights
Blocking complement receptor C5a (CD88) with an antagonist reduced epithelial to mesenchymal transition and cell proliferation in a mouse model of secondary cataract. This suggests a potential therapeutic strategy for preventing post-surgical cataracts.
Area of Science:
- Ophthalmology
- Immunology
- Molecular Biology
Background:
- Secondary cataracts, a common complication after cataract surgery, involve complex biological processes.
- The complement system, particularly complement receptor C5a (CD88), plays a role in ocular inflammation and tissue remodeling.
- Understanding the molecular mechanisms underlying secondary cataract formation is crucial for developing effective preventative strategies.
Purpose of the Study:
- To investigate the role of complement receptor C5a (CD88) in the development of secondary cataracts using a mouse model.
- To evaluate the therapeutic potential of a C5a receptor antagonist in preventing post-cataract surgery complications.
Main Methods:
- Cataract surgery was performed on C57BL/6J mice.
- A C5a receptor antagonist was administered intraperitoneally.
- Epithelial to mesenchymal transition (EMT) was assessed via alpha-smooth muscle actin (α-SMA) staining.
- Cell proliferation was measured using bromodeoxyuridine (BrdU) incorporation.
- Gene expression profiling was conducted using microarray analysis and quantitative polymerase chain reaction (QPCR).
Main Results:
- Administration of the C5a receptor antagonist significantly decreased EMT and cell proliferation in mice.
- Microarray analysis revealed that the antagonist influences gene regulation during EMT and lens fiber differentiation.
- The antagonist demonstrated potential as a novel, stage-specific regulator of crystallin genes.
- Down-regulation of genes encoding crystallins and lens-specific structural proteins was observed at week two.
Conclusions:
- The findings suggest that targeting C5a receptor with an antagonist may offer a therapeutic approach to prevent secondary cataracts post-surgery.
- The results highlight that crystallin gene expression can be modulated by pro-inflammatory processes within the eye.