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Müller-cell-derived leukaemia inhibitory factor arrests rod photoreceptor differentiation at a postmitotic pre-rod
C Neophytou1, A B Vernallis, A Smith
1Biology Department, University College London, UK. ucbtcne@ucl.ac.uk
Abstract:
In the present study, we examine rod photoreceptor development in dissociated-cell cultures of neonatal mouse retina. We show that, although very few rhodopsin+ rods develop in the presence of 10% foetal calf serum (FCS), large numbers develop in the absence of serum, but only if the cell density in the cultures is high. The rods all develop from nondividing rhodopsin- cells, and new rods continue to develop from rhodopsin- cells for at least 6-8 days, indicating that there can be a long delay between when a precursor cell withdraws from the cell cycle and when it becomes a rhodopsin+ rod. We show that FCS arrests rod development in these cultures at a postmitotic, rhodopsin-, pre-rod stage. We present evidence that FCS acts indirectly by stimulating the proliferation of Müller cells, which arrest rod differentiation by releasing leukaemia inhibitory factor (LIF). These findings identify an inhibitory cell-cell interaction, which may help to explain the long delay that can occur both in vitro and in vivo between cell-cycle withdrawal and rhodopsin expression during rod development.
Insights
Foetal calf serum (FCS) inhibits rod photoreceptor development in mouse retinal cultures. Removing FCS and ensuring high cell density promotes rod development from non-dividing precursors, revealing a crucial cell-cell interaction.
Area of Science:
- Neuroscience
- Developmental Biology
- Ophthalmology
Background:
- Rod photoreceptors are crucial for vision.
- Understanding rod development is key to treating retinal diseases.
- Rod development involves a delay between cell cycle exit and differentiation.
Purpose of the Study:
- To investigate factors influencing rod photoreceptor development in vitro.
- To elucidate the role of foetal calf serum (FCS) in rod development.
- To identify mechanisms underlying the delay in rhodopsin expression.
Main Methods:
- Dissociated-cell cultures of neonatal mouse retina.
- Rhodopsin expression analysis.
- Cell density and serum concentration manipulation.
- Müller cell proliferation and leukaemia inhibitory factor (LIF) detection.
Main Results:
- High cell density and absence of FCS promote rod development.
- FCS inhibits rod development by arresting cells at a postmitotic, pre-rod stage.
- FCS indirectly stimulates Müller cells to release LIF, which inhibits rod differentiation.
Conclusions:
- Rod development is regulated by inhibitory cell-cell interactions.
- Müller cell-derived LIF plays a role in delaying rod differentiation.
- Findings offer insights into the in vitro and in vivo delays in rod development.