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Manifold reduction of moesin in fetal Down syndrome brain
B Lubec1, R Weitzdoerfer, M Fountoulakis
1Department of Neonatology, University of Vienna, Vienna, A-1090, Austria. gert.lubec@akh-wien.ac.at
Abstract:
Moesin is a member of the ERM family and is involved in plasma membrane-actin cytoskeleton cross-linking, resulting cell adhesion, shape, and motility. Because moesin was shown to be highly expressed in growth cones and moesin/radixin suppression led to impaired structure and function of this key element in brain development, we tested the ERM family, ezrin, radixin, and moesin, in fetal Down syndrome (DS) cortex at the early second trimester. We applied two-dimensional gel electrophoresis with subsequent MALDI detection and identification of protein spots followed by quantification with specific software. Moesin was shown to be significantly and manifold reduced in fetal DS brain, whereas reduction of ezrin and radixin did not reach statistical significance. We therefore propose the involvement of moesin in developmental impairment of DS brain, including deteriorated arborisation, neuritic outgrowth, and neuronal migration. Furthermore, decreased moesin is the second F-actin bundling protein, besides drebrin, that is manifold reduced in fetal DS brain.
Insights
Moesin protein levels are significantly reduced in fetal Down syndrome (DS) brain, impacting neuronal development. This decrease, alongside reduced drebrin, suggests a role for moesin in DS-related brain abnormalities.
Area of Science:
- Neuroscience
- Developmental Biology
- Biochemistry
Background:
- Moesin is an ERM family protein crucial for linking the plasma membrane to the actin cytoskeleton.
- This linkage is vital for cell adhesion, shape, and motility, particularly in neuronal growth cones during brain development.
Purpose of the Study:
- To investigate the expression levels of ERM proteins (ezrin, radixin, moesin) in the fetal Down syndrome (DS) cortex.
- To determine if alterations in these proteins contribute to the developmental impairments observed in DS.
Main Methods:
- Two-dimensional gel electrophoresis was used to separate proteins from fetal DS cortex samples.
- Mass spectrometry (MALDI) identified protein spots, and specialized software quantified protein levels.
Main Results:
- Moesin was found to be significantly and substantially reduced in the fetal DS brain cortex.
- Reductions in ezrin and radixin did not reach statistical significance.
- Decreased moesin levels were observed alongside reduced drebrin, another F-actin bundling protein.
Conclusions:
- Moesin deficiency is proposed to be involved in the developmental impairments of the DS brain, such as altered neuritic outgrowth and neuronal migration.
- Reduced moesin may contribute to the structural and functional deficits seen in fetal DS brains.