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Glycosphingolipids of human plasma
Archives of Biochemistry and Biophysics
|May 1, 1985
Summary
This study identifies previously unknown gangliosides and neutral glycosphingolipids in human plasma. These findings expand our understanding of plasma lipid-bound sialic acid composition and glycolipid structures.
Area of Science:
- Biochemistry
- Glycobiology
- Human Physiology
Background:
- Human plasma contains various complex lipids, including glycosphingolipids, which play crucial roles in cellular functions.
- The comprehensive characterization of plasma glycosphingolipids, particularly gangliosides, remains an active area of research.
Purpose of the Study:
- To identify and characterize novel glycosphingolipids, including gangliosides, present in human plasma.
- To determine the distribution and structural diversity of these identified glycosphingolipids.
Main Methods:
- Purification of individual glycosphingolipids using high-performance liquid chromatography (HPLC) and thin-layer chromatography (TLC).
- Structural characterization through carbohydrate composition analysis, glycosidase hydrolysis, methylation analysis, and immunostaining with specific antibodies.
Main Results:
- Identification of 10 gangliosides not previously reported in human plasma.
- Quantification of lipid-bound sialic acid and the distribution of mono-, di-, tri-, and tetrasialo gangliosides.
- Characterization of various monosialogangliosides (e.g., GM3, GM2) and polysialo gangliosides (e.g., GD3, GD1a, GD1b, GQ1b) with ganglio-N-tetraose backbones.
- Identification of abundant neutral glycosphingolipids including glucosyl, lactosyl, and globotriaosylceramides, as well as H1, Lea, and Leb structures.
Conclusions:
- This study significantly expands the known repertoire of glycosphingolipids in human plasma.
- The detailed characterization provides a foundation for understanding the physiological roles of these newly identified plasma glycosphingolipids.