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TGF-β signaling regulates neuronal C1q expression and developmental synaptic refinement.
Allison R Bialas1, Beth Stevens
11] Department of Neurology, F.M. Kirby Neurobiology Center, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA. [2] Program in Neuroscience, Harvard Medical School, Boston, Massachusetts, USA.
Nature Neuroscience
|October 29, 2013
Summary
Transforming growth factor-beta (TGF-β) regulates neuronal C1q expression, a key immune molecule. This process is crucial for synaptic pruning and refinement in the developing visual system.
Area of Science:
- Neuroscience
- Immunology
- Developmental Biology
Background:
- Complement proteins C1q and C3 mediate synaptic refinement and plasticity.
- Microglial phagocytosis, driven by C3, refines the developing visual system.
- Neuronal C1q expression is critical for retinogeniculate refinement but its regulation is unknown.
Purpose of the Study:
- To identify the signals regulating neuronal C1q expression and function.
- To investigate the role of transforming growth factor-beta (TGF-β) in synaptic pruning.
Main Methods:
- Investigated TGF-β signaling in retinal neurons using genetic manipulation (TGFβRII knockout).
- Assessed C1q expression, complement localization, and synaptic pruning.
- Analyzed visual system refinement, eye-specific segregation, and microglial engulfment.
Main Results:
- Retinal neurons lacking TGF-β receptor II showed reduced C1q expression.
- Complement synaptic localization was decreased in these neurons.
- Synaptic pruning and eye-specific segregation defects were observed, similar to complement-deficient mice.
Conclusions:
- Retinal TGF-β is a key regulator of neuronal C1q expression.
- TGF-β signaling initiates complement- and microglia-mediated synaptic pruning in the visual system.
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