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Characterization of the intermolecular associations of the dystrophin-associated glycoprotein complex in retinal
T Claudepierre1, C Dalloz, D Mornet
1Inserm EMI 99-18, Laboratoire de Physiopathologie Moléculaire et Cellulaire de la Rétine, CHRU, France.
Abstract:
The abnormal retinal neurotransmission observed in Duchenne muscular dystrophy patients has been attributed to altered expression of C-terminal products of the dystrophin gene in this tissue. Müller glial cells from rat retina express dystrophin protein Dp71, utrophin and the members of the dystrophin-associated glycoprotein complex (DGC), namely beta-dystroglycan, delta- and gamma-sarcoglycans and alpha1-syntrophin. The DGC could function in muscle as a link between the cystoskeleton and the extracellular matrix, as well as a signaling complex. However, other than in muscle the composition and intermolecular associations among members of the DGC are still unknown. Here we demonstrate that Dp71 and/or utrophin from rat retinal Müller glial cells form a complex with beta-dystroglycan, delta-sarcoglycan and alpha1-syntrophin. We also show that beta-dystroglycan is associated with alpha-dystrobrevin-1 and PSD-93 and that anti-PSD antibodies coimmunoprecipitated alpha-syntrophin with PSD-93. By overlay experiments we also found that Dp71and/or utrophin and alpha-dystroglycan from Müller cells could bind to actin and laminin, respectively. These results indicate that the DGC could have both structural and signaling functions in retina. On the basis of our accumulated evidence, we propose a hypothetical model for the molecular organization of the dystrophin-associated glycoprotein complex in retinal Müller glial cells, which would be helpful for understanding its function in the central nervous system.
Insights
Duchenne muscular dystrophy affects retinal neurotransmission due to altered dystrophin gene products. In rat Müller glial cells, the dystrophin-associated glycoprotein complex (DGC) shows structural and signaling roles, potentially impacting central nervous system function.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Abnormal retinal neurotransmission in Duchenne muscular dystrophy is linked to dystrophin gene products.
- Müller glial cells express dystrophin protein Dp71, utrophin, and components of the dystrophin-associated glycoprotein complex (DGC).
- The DGC's function and composition outside of muscle are not well understood.
Purpose of the Study:
- To investigate the composition and intermolecular associations of the DGC in rat retinal Müller glial cells.
- To elucidate the potential structural and signaling functions of the DGC in the retina.
- To propose a model for the DGC's molecular organization in retinal Müller glial cells.
Main Methods:
- Co-immunoprecipitation assays to identify protein complexes.
- Overlay experiments to determine binding interactions.
- Western blotting to detect protein expression.
Main Results:
- Dp71 and/or utrophin form a complex with beta-dystroglycan, delta-sarcoglycan, and alpha1-syntrophin in Müller cells.
- Beta-dystroglycan associates with alpha-dystrobrevin-1 and PSD-93.
- Dp71/utrophin bind to actin, and alpha-dystroglycan binds to laminin.
Conclusions:
- The DGC in retinal Müller glial cells possesses both structural and signaling functions.
- The findings provide a hypothetical model for DGC organization in the retina.
- Understanding the DGC in Müller cells may offer insights into central nervous system function.
