Abstract
Among the many glycoconjugates contributing to the sugar code, gangliosides have drawn special attention owing to their predominance as the major sialoglycoconjugate category within the nervous system. However, their occurrence, albeit at lower levels, appears ubiquitous in vertebrate cells and even some invertebrate tissues. Now that over 100 gangliosides have been structurally characterized, their diverse physiological functions constitute a remaining enigma. This has been especially true of GM1, for which a surprising array of functions has already been revealed. Our current research has focused on two areas of GM1 function: (a) signaling induced in neural and immune cells by cross-linking of GM1 in the plasma membrane that leads to activation of TRPC5 (transient receptor potiential, canonical form 5) channels, a process important in neuritogenesis and autoimmune suppression; (b) activation by GM1 of a sodium-calcium exchanger (NCX) in the inner membrane of the nuclear envelope (NE) with resulting modulation of nuclear and cellular calcium. The latter has a role in maintaining neuronal viability, loss of which renders neurons vulnerable to Ca2+ overload. Pathological manifestations in mutant mice and their cultured neurons lacking GM1 have shown dramatic rescue with a membrane permeable derivative of GM1 that enters the nucleus and restores NCX activity. Nuclear function of GM1 is related to the presence of neuraminidase in the NE, an enzyme that generates GM1 through hydrolysis of GD1a. A different isoform of this enzyme was found in each of the two membranes of the NE.
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Abbreviations
- CtxB:
-
B subunit of cholera toxin
- ER:
-
Endoplasmic reticulum
- Gal-1:
-
Galectin-1
- IP:
-
Intraperitoneal
- N’ase:
-
Neuraminidase
- NCX:
-
Sodium-calcium exchanger
- NE:
-
Nuclear envelope
- Teff:
-
Effector T cell
- Treg:
-
Regulatory T cell
- TRPC5:
-
Transient receptor potential, isoform 5 of canonical subgroup
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Supported by grants from the NIH and NMSS.
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A note of special appreciation is due Dr. Lajtha, affectionately known as Abel by most everyone in the field. He has given most generously of his time and talent over many years toward building the pillars of what has come to be recognized as the mature discipline of neurochemistry. The journal he created 35 years ago and edited to the present time has been one such pillar, an essential vehicle for publication of findings considered controversial as well as mainstream. Handbook of Neurochemistry and Molecular Neurobiology, another editorial creation of his, has become an essential encyclopedia for working neuroscientists. Abel is one who will have to stoop a bit when passing through portals made for giants. On a personal note, it has been my good fortune to benefit on several occasions from Abel’s generosity of spirit and sound judgement, whether preparing a manuscript, serving together on committees, evaluating new discoveries, or negotiating a ski slope. Abel’s contributions to science and warm personal friendship will be long remembered and appreciated.
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Ledeen, R.W., Wu, G. In Search of a Solution to the Sphinx-Like Riddle of GM1. Neurochem Res 35, 1867–1874 (2010). https://doi.org/10.1007/s11064-010-0286-0
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DOI: https://doi.org/10.1007/s11064-010-0286-0