Abstract
Since the 1980s, it has been known that the administration of ganglioside GM1 to cultured cells induced or enhanced neuronal differentiation. GM1 mechanism of action relies on its direct interaction and subsequent activation of the membrane tyrosine kinase receptor, TrkA, which naturally serves as NGF receptor. This process is mediated by the sole oligosaccharide portion of GM1, the pentasaccharide β-Gal-(1-3)-β-GalNAc-(1-4)-[α-Neu5Ac-(2-3)]-β-Gal-(1-4)-β-Glc. Here we detailed the minimum structural requirements of the oligosaccharide portion of GM1 for mediating the TrkA dependent neuritogenic processing. By in vitro and in silico biochemical approaches, we demonstrated that the minimal portion of GM1 required for the TrkA activation is the inner core of the ganglioside’s oligosaccharide β-Gal-(1-3)-β-GalNAc-(1-4)-[α-Neu5Ac-(2-3)]-β-Gal. The addition of a sialic acid residue at position 3 of the outer galactose of the GM1 oligosaccharide, which forms the oligosaccharide of GD1a, prevented the interaction with TrkA and the resulting neuritogenesis. On the contrary, the addition of a fucose residue at position 2 of the outer galactose, forming the Fucosyl-GM1 oligosaccharide, did not prevent the TrkA-mediated neuritogenesis.
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Data availability statement
The data presented in this study are available upon reasonable request to the corresponding author.
Abbreviations
- Asialo-GM1:
-
Gg4Cer, β-Gal-(1-3)-β-GalNAc-(1-4)-β-Gal-(1-4)-β-Glc-(1-1)-Cer
- Asialo-OligoGM1:
-
Gg4, β-Gal-(1-3)-β-GalNAc-(1-4)-β-Gal-(1-4)-Glc
- BSA:
-
Bovine serum albumin
- CTRL:
-
Control
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- DTT:
-
1,4-Dithiothreitol
- ESI:
-
Electrospray ionization process
- FBS:
-
Fetal bovine serum
- Fuc-OligoGM1:
-
Fucosyl-GM1 oligosaccharide, IV2αFucII3Neu5Ac-Gg4, α-Fuc-(1-2)-β-Gal-(1-3)-β-GalNAc-(1-4)-[α-Neu5Ac-(2-3)]-β-Gal-(1-4)-Glc
- Fuc-GM1:
-
Fucosyl-GM1, Fucosyl-GM1IV2αFucII3Neu5AcGg4Cer, α-Fuc-(1-2)-β-Gal-(1-3)-β-GalNAc-(1-4)-[α-Neu5Ac-(2-3)]-β-Gal-(1-4)-β-Glc-(1-1)-Cer
- GM1:
-
II3Neu5Ac-Gg4Cer, β-Gal-(1-3)-β-GalNAc-(1-4)-[α-Neu5Ac-(2-3)]-β-Gal-(1-4)-β-Glc-(1-1)-Cer
- GM2:
-
II3Neu5Ac-Gg3Cer, β-GalNAc-(1-4)-[α-Neu5Ac-(2-3)]-β-Gal-(1-4)-β-Glc-(1-1)-Cer
- GM3:
-
II3Neu5Ac-Lac-Cer, α-Neu5Ac-(2-3)-β-Gal-(1-4)-β-Glc-(1-1)-Cer
- GD1a:
-
IV3Ne5AcII3Neu5Ac-Gg4Cer, α-Neu5Ac-(2-3)-β-Gal-(1-3)-β-GalNAc-(1-4)-[α-Neu5Ac-(2-3)]-β-Gal-(1-4)-β-Glc-(1-1)-Cer
- HPTLC:
-
High-performance thin-layer chromatography
- MAPK:
-
Mitogen-activated protein kinase
- MS:
-
Mass spectrometry
- N2a:
-
Neuroblastoma Neuro2a cells
- NGF:
-
Nerve growth factor
- NMR:
-
Nuclear magnetic resonance
- OligoGM1:
-
GM1 oligosaccharide, II3Neu5Ac-Gg4, β-Gal-(1-3)-β-GalNAc-(1-4)-[α-Neu5Ac-(2-3)]-β-Gal-(1-4)-Glc
- OligoGD1a:
-
GD1a oligosaccharide, IV3Ne5AcII3Neu5Ac-Gg4
- OligoGM3:
-
GM3 oligosaccharide, II3Neu5Ac-Lac, α-Neu5Ac-(2-3)-β-Gal-(1-4)-Glc
- OligoGM2:
-
GM2 oligosaccharide, II3Neu5Ac-Gg3, β-GalNAc-(1-4)-[α-Neu5Ac-(2-3)]-β-Gal-(1-4)-Glc
- OligoGM1 w/o Glc:
-
GM1 oligosaccharide without glucose; β-Gal-(1-3)-β-GalNAc-(1-4)-[α-Neu5Ac-(2-3)]-Gal
- P/S:
-
Penicillin/streptomycin
- pTrk:
-
Phosphorylated Trk
- PVDF:
-
Polyvinylidene difluoride
- reduced-OligoGM1:
-
GM1 oligosaccharide containing reduced glucose in position 1, β-Gal-(1-3)-β-GalNAc-(1-4)-[α-Neu5Ac-(2-3)]-β-Gal-(1-4)-Glucitol
- TBS-T:
-
Tris-buffered saline containing 0.1% Tween-20
- Tyr:
-
Tyrosine
- Trk:
-
Neurotrophin tyrosin kinase receptor
- w/o:
-
Without
- WT:
-
Wild-type
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Funding
E.C. was supported by PSR 2019, University of Milano. L.M. was supported by RV_TAR16SSONN_M. I.E., L.P., Si.Sa. and O.B.M. were supported by MIUR “Progetto d’Eccellenza 2023–2025”. L.P. was supported by PSR 2022, University of Milano.
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Conceptualization, methodology, investigation, analysis, and draft of the manuscript, M.F., G.L., E.D.B.; M.M., E.V.C., L.C., L.V., E.C., Si.Sa., O.B.M., L.P., I.E., M.A., N.L., M.G.C. Supervision, conceptualization, draft and revision of the manuscript, M.F., G.L., Sa.So., I.E., E.C.; GM1 and derivatives chemical synthesis, L.M., M.G.C., K.T., A.I., H.I., Docking Analysis: I.E., O.B.M., Si.Sa., L.P.; All authors have revised, read and agreed to the published version of the manuscript.
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Fazzari, M., Lunghi, G., Di Biase, E. et al. GM1 structural requirements to mediate neuronal functions. Glycoconj J 40, 655–668 (2023). https://doi.org/10.1007/s10719-023-10141-8
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DOI: https://doi.org/10.1007/s10719-023-10141-8