Detection of the novel cell adhesion molecule MUC18 in human brain tissue
H Hampel1, D A Körschenhausen, M J Schwarz
1Department of Psychiatry, Ludwig-Maximilian University, Munich, Germany. hampel@psy.med.uni-muenchen.de
Insights
Researchers identified a novel glycoprotein in the central nervous system (CNS) that functions as a cell adhesion molecule (CAM). This molecule shows similarities to known neuronal CAMs and may play a role in neurodevelopment and cell interactions.
Area of Science:
- Neuroscience
- Immunology
- Molecular Biology
Background:
- Cell adhesion molecules (CAMs) are crucial for immune responses in neurological conditions.
- Neural cell adhesion molecule (NCAM) and myelin-associated glycoprotein (MAG) are key CNS CAMs within the immunoglobulin superfamily (IgSF).
- These molecules are involved in neuronal and oligodendrocyte adhesion during development.
Purpose of the Study:
- To identify and characterize novel cell adhesion molecules in the central nervous system (CNS).
- To investigate the potential role of a newly discovered glycoprotein in CNS cell-cell interactions and neurodevelopment.
Main Methods:
- Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) was employed.
- Immunoblotting techniques were used to detect and analyze the novel antigen.
- Analysis of post-mortem frontal lobe tissue from ten human subjects.
Main Results:
- A novel CNS glycoprotein antigen was detected at apparent molecular masses of 65 and 113 kD.
- The antigen demonstrated significant sequence homology to neuronal immunoglobulin superfamily (IgSF) members, such as NCAM.
- This CAM was previously identified in human melanoma cells, with expression increasing in progressing tumors.
Conclusions:
- The novel glycoprotein functions as a cell adhesion molecule (CAM) in the CNS.
- It is likely involved in CNS cell-cell interactions and is developmentally regulated in neuroectodermal tissues.
- Further research is warranted to elucidate its precise functions in neurological processes and diseases.
Abstract:
The implication of cell adhesion molecules (CAMs) in the mediation of the immune response to inflammatory stimuli has been shown in different neurological syndromes. The neural cell adhesion molecule (NCAM) and the myelin associated glycoprotein (MAG) are functionally important CNS-cell adhesion molecules (CAMs) and members of the immunoglobulin gene superfamily (IgSF). Both CAMs are expressed from the time of neuronal induction and myelin formation and are likely to contribute to the generally adhesive properties of neurons and oligodendrocytes. The present study describes, by means of SDS-PAGE and immunoblotting, a novel CNS antigen which is a glycoprotein detected in post mortem frontal lobe tissue of ten subjects at an M(r) 65 and 113 kD which showed the greatest sequence homology to neuronal IgSF members like NCAM. This expected membrane CAM, with probable functions in CNS cell-cell interactions, had been detected first in primary human melanoma cells, with increasing expression as tumors progress and is expected to be a developmentally regulated CAM in neuroectodermal tissues.
