Axonal TAU Sorting Requires the C-terminus of TAU but is Independent of ANKG and TRIM46 Enrichment at the AIS

•SH-SY5Y-derived neurons are a suitable human cell model for studying TAU sorting.•The N-terminal protein half is not sufficient for anterograde axonal targeting of TAU protein.•Axonal TAU sorting in human neurons may be independent of classical AIS formation. Somatodendritic missorting of the axona...

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Published in:	Neuroscience Vol. 461; pp. 155 - 171
Main Authors:	Bell, M., Bachmann, S., Klimek, J., Langerscheidt, F., Zempel, H.
Format:	Journal Article
Language:	English
Published:	United States Elsevier Ltd 01-05-2021
Subjects:	Alzheimer’s disease Animals ANKG Ankyrins Axon Initial Segment - metabolism Axons - metabolism Cell Line, Tumor Humans Mice Nerve Tissue Proteins - metabolism neuronal polarity Neurons - metabolism Protein Transport SH-SY5Y-derived neurons tau Proteins - metabolism TAU sorting TRIM46 SH-SY5Y Nav TPA SHM-0 SHM-10 TAU TAU sorting N-term-TAUHA MFI 0N3R-TAUHA d7 ANOVA FBS ANKG TRIM46 PDL FYN AEF AD DEF Alzheimer’s disease BDNF MT neuronal polarity div7 AIS CMV ROI RA TTLL6 HA tag DNA IPSCs EB3 Ngn2 MAP SH-SY5Y-derived neurons
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Summary:	•SH-SY5Y-derived neurons are a suitable human cell model for studying TAU sorting.•The N-terminal protein half is not sufficient for anterograde axonal targeting of TAU protein.•Axonal TAU sorting in human neurons may be independent of classical AIS formation. Somatodendritic missorting of the axonal protein TAU is a hallmark of Alzheimer’s disease and related tauopathies. Rodent primary neurons and iPSC-derived neurons are used for studying mechanisms of neuronal polarity, including TAU trafficking. However, these models are expensive, time-consuming, and/or require the killing of animals. In this study, we tested four differentiation procedures to generate mature neuron cultures from human SH-SY5Y neuroblastoma cells and assessed the TAU sorting capacity. We show that SH-SY5Y-derived neurons, differentiated with sequential RA/BDNF treatment, are suitable for investigating axonal TAU sorting. These human neurons show pronounced neuronal polarity, axodendritic outgrowth, expression of the neuronal maturation markers TAU and MAP2, and, importantly, efficient axonal sorting of endogenous and transfected human wild-type TAU, similar to mouse primary neurons. We demonstrate that the N-terminal half of TAU is not sufficient for axonal targeting, as a C-terminus-lacking construct (N-term-TAUHA) is not axonally enriched in both neuronal cell models. Importantly, SH-SY5Y-derived neurons do not show the formation of a classical axon initial segment (AIS), indicated by the lack of ankyrin G (ANKG) and tripartite motif-containing protein 46 (TRIM46) at the proximal axon, which suggests that successful axonal TAU sorting is independent of classical AIS formation. Taken together, our results provide evidence that (i) SH-SY5Y-derived neurons are a valuable human neuronal cell model for studying TAU sorting readily accessible at low cost and without animal need, and that (ii) efficient axonal TAU targeting is independent of ANKG or TRIM46 enrichment at the proximal axon in these neurons.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0306-4522 1873-7544
DOI:	10.1016/j.neuroscience.2021.01.041