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Density-dependent resistance to apoptosis in retinal cells
G M Tezel1, G M Seigel, M B Wax
1Washington University School of Medicine Department of Ophthalmology & Visual Sciences Missouri, St. Louis 63110, USA.
Current Eye Research
|October 16, 1999
Summary
Retinal cell density significantly impacts apoptosis resistance. Higher cell density cultures show increased survival against apoptotic stimuli, potentially due to heat shock protein 27 (hsp27) and preserved cytoskeletal integrity.
Area of Science:
- Neuroscience
- Cell Biology
- Ophthalmology
Background:
- Cell density is a critical factor influencing cellular behavior and survival.
- Understanding factors that modulate retinal cell apoptosis is crucial for developing neuroprotective strategies.
Purpose of the Study:
- To investigate the effect of cell density on retinal cell survival and apoptosis.
- To explore the underlying molecular mechanisms, including cytoskeletal integrity and protein expression.
Main Methods:
- Retinal cells were cultured at high and low densities and subjected to various apoptotic stimuli.
- Apoptosis was quantified using TUNEL assay and flow cytometry.
- Cytoskeletal changes, protein expression (bcl-2 family, hsp27), and western blotting were analyzed.
Main Results:
- Lower density cultures exhibited significantly higher rates of apoptosis.
- Actin and tubulin degradation was more pronounced in lower density cultures.
- Higher density cultures showed increased expression of heat shock protein 27 (hsp27) and better resistance to apoptosis.
Conclusions:
- Retinal cells are more resistant to apoptosis at higher densities, irrespective of the inducer.
- Endogenous hsp27 in higher density cultures may contribute to cytoskeletal integrity and enhanced cell survival.