Related Experiment Videos
Sulfated glucuronyl paragloboside in rat brain microvessels.
N Miyatani1, T Kohriyama, Y Maeda
1Department of Biochemistry and Molecular Biophysics, Medical College of Virginia, Richmond 23298-0614.
Journal of Neurochemistry
|August 1, 1990
Summary
Monoclonal antibodies in paraproteinemic neuropathy may target brain endothelial cells. This interaction could breach the blood-brain barrier, allowing immunoglobulin entry and nerve damage.
Area of Science:
- Neuroimmunology
- Vascular Biology
- Glycosphingolipid Biochemistry
Background:
- Neuropathy associated with paraproteinemia involves monoclonal IgM antibodies targeting myelin-associated glycoprotein and sulfated glucuronyl glycolipids.
- The mechanism of autoantibody access to nervous tissue across the blood-brain barrier (BBB) or blood-nerve barrier (BNB) remains unclear.
Purpose of the Study:
- To investigate the presence of sulfated glucuronyl glycolipid antigens on brain endothelial cells.
- To explore a potential mechanism for autoantibody penetration into the central nervous system.
Main Methods:
- Isolation of microvessels from adult Lewis rat brain cortex.
- Detection of sulfated glucuronyl paragloboside (SGPG) using thin-layer chromatography (TLC) immunostaining.
- Immunofluorescence studies on microvessels and cultured human umbilical vein endothelial cells.
Main Results:
- SGPG was identified in the acidic lipid fraction of rat brain microvessels.
- Positive immunofluorescence staining for SGPG was observed on the surface of isolated microvessels.
- SGPG was also detected in cultured human umbilical vein endothelial cells.
Conclusions:
- Endothelial cells possess antigenic sites (SGPG) capable of interacting with autoantibodies.
- This interaction may impair endothelial cell function, altering BBB permeability.
- Increased BBB permeability could facilitate immunoglobulin entry into the endoneurial space, contributing to neuropathy.