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The anti-death league: associative control of apoptosis in developing retinal tissue
1Instituto de Biofísica da UFRJ, Cidade Universitaria, Centro de Ciencias da Saude, Rio de Janeiro, Brazil. rlinden@biof.ufrj.br
Abstract:
Apoptosis, the major form of programmed cell death (PCD), is executed through a proteolytic cascade that can be differentially engaged by various extracellular signals. Modulation of both the sensitivity to PCD and of the actual sequence of apoptotic events is, therefore, strongly dependent on cell interactions. This paper reviews the use of a retinal explant preparation as a model of the organized nervous tissue, to study the effects of neural messengers in the control of sensitivity to apoptosis. Studies of retinal explants showed that dopamine, glutamate and nitric oxide may have anti-apoptotic effects upon developing retinal cells. At least the effects of nitric oxide are clearly paracrine. In addition, preliminary evidence has been gathered of a role for gap junctional communication in the control of sensitivity of retinal cells to the induction of apoptosis. These findings underscore the importance of selective cell interactions in the control of PCD in the developing nervous system.
Insights
Neural messengers like dopamine and nitric oxide may protect developing retinal cells from programmed cell death (PCD). Cell interactions are crucial for controlling PCD in the nervous system.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Apoptosis, a key form of programmed cell death (PCD), involves a proteolytic cascade influenced by extracellular signals.
- Cell interactions significantly modulate sensitivity to PCD and the apoptotic process.
- Understanding PCD control is vital for nervous system development.
Purpose of the Study:
- To review the use of retinal explants as a model for studying organized nervous tissue.
- To investigate the effects of neural messengers on apoptosis sensitivity in developing retinal cells.
Main Methods:
- Utilized a retinal explant preparation model.
- Examined the influence of neural messengers (dopamine, glutamate, nitric oxide) on apoptosis.
- Assessed the role of gap junctional communication in apoptosis control.
Main Results:
- Dopamine, glutamate, and nitric oxide demonstrated potential anti-apoptotic effects on developing retinal cells.
- Nitric oxide's anti-apoptotic effects were confirmed to be paracrine.
- Preliminary evidence suggests gap junctional communication influences retinal cell apoptosis sensitivity.
Conclusions:
- Selective cell interactions play a critical role in regulating PCD within the developing nervous system.
- Neural messengers and cell communication pathways are important regulators of apoptosis in retinal development.