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Inhibition of lens epithelial cells by Fas-specific antibody activating Fas-Fas ligand system
1Nishi Eye Hospital, Osaka, Nakamichi, Higashinari-ku, Japan okihior@nishi-ganka.or.jp
Purpose:
To detect cell specific apoptosis factors, Fas and Fas ligand, and the common intracellular apoptosis modulators, interleukin-1 beta converting enzyme (ICE)-like protease (caspase 1), Bcl-2, Bcl-xL and Bax in lens epithelial cells (LEC) of human cataracts. To study the effects of Fas-stimulating monoclonal antibody on inhibition of LEC proliferation.
Methods:
Reverse-transcriptase-polymerase chain reaction (RT-PCR) was used to detect Fas, Fas ligand, caspase 1, Bcl-2, Bcl-xL and Bax, after cDNA was synthesized from the total RNA isolated from human cataractous LEC obtained by capsulotomy during cataract surgery. Fas-stimulating monoclonal antibody was added at the concentrations of 10, 30, 100, 300 and 1000 ng/ml to the incubation medium of human cataractous LEC; and the specimens were incubated for 24 h at 37 degrees C with 5% CO(2) circulation and 100% humidity. The specimens were then stained with Hoechst 33342, and the number of apoptotic cells was counted.
Results:
Fas, caspase 1, Bcl-2, Bcl-xL and Bax mRNA were detected by RT-PCR. Fas ligand mRNA was not detected by RT-PCR. At each concentration, Fas-stimulating monoclonal antibody significantly inhibited LEC proliferation.
Conclusions:
Human cataractous LEC expressed mRNA of Fas and various modulators of apoptosis pathways. Fas-stimulating monoclonal antibody may have the potential to prevent posterior capsule opacification after cataract surgery by inhibiting LEC proliferation.
Insights
Human cataract cells express apoptosis factors. Fas-stimulating monoclonal antibody inhibited lens epithelial cell proliferation, suggesting potential for preventing cataract complications.
Area of Science:
- Ophthalmology
- Cell Biology
- Molecular Biology
Background:
- Cataracts are a leading cause of vision loss, often involving changes in lens epithelial cells (LEC).
- Apoptosis, or programmed cell death, plays a role in cataract formation and progression.
- Understanding the molecular mechanisms of apoptosis in LEC is crucial for developing therapeutic strategies.
Purpose of the Study:
- To detect specific apoptosis factors (Fas, Fas ligand) and intracellular apoptosis modulators (caspase 1, Bcl-2, Bcl-xL, Bax) in human cataractous LEC.
- To investigate the effect of Fas-stimulating monoclonal antibody on inhibiting LEC proliferation.
Main Methods:
- Reverse-transcriptase polymerase chain reaction (RT-PCR) was employed to analyze mRNA expression of apoptosis-related genes in LEC.
- Human cataractous LEC were isolated from surgical specimens.
- Fas-stimulating monoclonal antibody was applied at varying concentrations to cultured LEC, followed by cell counting to assess proliferation inhibition.
Main Results:
- mRNA for Fas, caspase 1, Bcl-2, Bcl-xL, and Bax was successfully detected in human cataractous LEC.
- Fas ligand mRNA was not detected in the studied samples.
- Fas-stimulating monoclonal antibody demonstrated significant inhibition of LEC proliferation across all tested concentrations.
Conclusions:
- Human cataractous LEC express key apoptosis-related genes, including Fas and its modulators.
- Fas-stimulating monoclonal antibody exhibits potential in inhibiting LEC proliferation.
- This suggests a possible therapeutic role for Fas-stimulating monoclonal antibody in preventing posterior capsule opacification post-cataract surgery.
