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Neuronal expression of muskelin in the rodent central nervous system
Nadia Tagnaouti1, Sven Loebrich, Frank Heisler
1Zentrum für Molekulare Neurobiologie Hamburg, ZMNH, Universität Hamburg, Germany. nadia_tagnaouti@yahoo.fr <nadia_tagnaouti@yahoo.fr>
Background:
The kelch repeat protein muskelin mediates cytoskeletal responses to the extracellular matrix protein thrombospondin 1, (TSP1), that is known to promote synaptogenesis in the central nervous system (CNS). Muskelin displays intracellular localization and affects cytoskeletal organization in adherent cells. Muskelin is expressed in adult brain and has been reported to bind the Cdk5 activator p39, which also facilitates the formation of functional synapses. Since little is known about muskelin in neuronal tissues, we here analysed the tissue distribution of muskelin in rodent brain and analysed its subcellular localization using cultured neurons from multiple life stages.
Results:
Our data show that muskelin transcripts and polypeptides are expressed throughout the central nervous system with significantly high levels in hippocampus and cerebellum, a finding that resembles the tissue distribution of p39. At the subcellular level, muskelin is found in the soma, in neurite projections and the nucleus with a punctate distribution in both axons and dendrites. Immunostaining and synaptosome preparations identify partial localization of muskelin at synaptic sites. Differential centrifugation further reveals muskelin in membrane-enriched, rather than cytosolic fractions.
Conclusion:
Our results suggest that muskelin represents a multifunctional protein associated with membranes and/or large protein complexes in most neurons of the central nervous system. These data are in conclusion with distinct roles of muskelin's functional interaction partners.
Insights
Muskelin, a protein involved in cytoskeletal responses, is widely distributed in the central nervous system, particularly in the hippocampus and cerebellum. It localizes to neuronal structures, including synapses, suggesting multifunctional roles.
Area of Science:
- Neuroscience
- Cell Biology
- Protein Biochemistry
Background:
- Muskelin, a kelch repeat protein, mediates cytoskeletal responses to thrombospondin 1 (TSP1), a promoter of central nervous system (CNS) synaptogenesis.
- Muskelin is expressed in the adult brain and interacts with Cdk5 activator p39, which also aids synapse formation.
- Limited information exists on muskelin's function in neuronal tissues.
Purpose of the Study:
- To investigate the tissue distribution of muskelin in the rodent brain.
- To determine the subcellular localization of muskelin in cultured neurons across different life stages.
Main Methods:
- Analysis of muskelin transcript and polypeptide expression in rodent brain.
- Subcellular localization studies using cultured neurons.
- Immunostaining and synaptosome preparation.
- Differential centrifugation.
Main Results:
- Muskelin transcripts and polypeptides are expressed throughout the CNS, with high levels in the hippocampus and cerebellum, mirroring p39 distribution.
- Subcellularly, muskelin is found in the soma, neurites, and nucleus, with punctate distribution in axons and dendrites.
- Muskelin partially localizes to synaptic sites and is enriched in membrane fractions.
Conclusions:
- Muskelin is a multifunctional protein found in most CNS neurons, associated with membranes and/or large protein complexes.
- These findings support distinct roles for muskelin based on its interaction partners.
