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Sorting mechanisms of Tau and MAP2 in neurons: Suppressed axonal transit of MAP2 and locally regulated microtubule binding
Open accessAbstract
Tau is abundant in the axon, whereas MAP2 is found in the cell body and dendrites. To understand their differential localization, we performed transfection studies on primary cultured neurons using tagged tau, MAP2, MAP2C, and their chimeric/deletion mutants. We found that MAP2 was prevented from entering the axon by its N-terminal projection domain and that microtubule binding of tau was stronger in the axon than in the cell body and dendrites, whereas that of MAP2/MAP2C was tighter in the cell body and dendrites than in the axon. These binding properties were determined by their microtubule-binding domains and were suggested to be regulated by phosphorylation, at least in the case of tau. Thus, the suppressed axonal transit of MAP2 and locally regulated microtubule binding may play important roles for their sorting in neurons.
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“Kanai et al. (6) also reported that the projection domain (PD) of MAP2, which exists only in MAP2A and B, prevents MAP2 from entering the axon, resulting in the somatodendritic localization of HMW MAP2”
From Active transport by cytoplasmic dynein sustains dendritic MAP2 localization in developing neurons (2026) · cites this paper as [6]
In the citing paper
“Tau is highly expressed in neurons in the mammalian brain, and normally localizes predominantly to axons as an important regulator of axonal transport [124–126].”
From Molecular and cellular mechanisms underlying the pathogenesis of Alzheimer’s disease (2020) · cites this paper as [125]
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Lost after translation: missorting of Tau protein and consequences for Alzheimer disease
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“…with rhodamine-coupled phalloidin. that their localization is determined by mRNA localization (Garner et al., 1988; Litman et al., 1993), by locally differing protein turnover (Okabe and Hirokawa, 1989), or by locally regulated microtubule binding (Ferreira et al., 1993; Kanai and Hirokawa, 1995).”
Regulation of microtubule-associated proteins
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Fibroblast growth factor 14 is an intracellular modulator of voltage‐gated sodium channels
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“In the case of MAP2C, mRNA is confined to the cell body (Garner et al., 1988) and despite its transport of the protein into the axon (Kanai and Hirokawa , 1995), MAP2C is compartmentalized in cell bodies and dendrites in matured neurons (Tucker et al., 1988b).”
BackgroundResultInfluentialSelf-citationSaito, N., Okada, Y., Noda, Y., Kinoshita, Y., Kondo, S., & Hirokawa, N. (1997) · Neuron · doi:10.1016/s0896-6273(00)81243-x · Cited by 168
Self-citationMarszalek, J. R., Weiner, J. A., Farlow, S. J., Chun, J. J. M., & Goldstein, L. S. B. (1999) · The Journal of Cell Biology · doi:10.1083/jcb.145.3.469 · Cited by 167
“There is some evidence that differences in protein stability between the axonal and dendritic processes can account for enrichment of protein within one of the processes (i.e., MAP2; Okabe and Hirokawa, 1989; Kanai and Hirokawa, 1995).”
BackgroundMore than a marker: potential pathogenic functions of MAP2
DeGiosio, R. A., Grubisha, M. J., MacDonald, M. L., McKinney, B. C., Camacho, C. J., & Sweet, R. A. (2022) · Frontiers in Molecular Neuroscience · doi:10.3389/fnmol.2022.974890 · Cited by 173
“An enhanced selectivity of the HMW forms for the dendritic compartment may be due to presence of the projection domain, which inhibits MAP2A/B access to axons (Kanai and Hirokawa, 1995), perhaps via interactions with axonal initial segment proteins such as AnkyrinG (Hedstrom et al.”
BackgroundChiasseu, M., Alarcón-Martínez, L., Belforte, N., Quintero, H., Dotigny, F., Destroismaisons, L., Velde, C. V., Panayi, F., Louis, C., & Polo, A. D. (2017) · Molecular Neurodegeneration · doi:10.1186/s13024-017-0199-3 · Cited by 158
“Changes in tau phosphorylation might reduce its affinity for axonal microtubules and increase it for dendritic microtubules, as shown in cultured spinal cord neurons [113].”
Swimming against the Tide: Mobility of the Microtubule-Associated Protein Tau in Neurons
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“…localizations in the neuron during the different stages of neuronal development (Conde and Ca´-ceres, 2009 (legend continued on next page) polarization of MAPs, like MAP2 and Tau (Garner et al., 1988; Hir-okawa et al., 1996; Kanai and Hirokawa, 1995; Li et al., 2011; Okabe and Hirokawa, 1989).”
Somatodendritic localization of phosphorylated tau in neonatal and adult rat cerebral cortex
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Acetylated Microtubules Are Preferentially Bundled Leading to Enhanced Kinesin-1 Motility
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Tau Accumulation, Altered Phosphorylation, and Missorting Promote Neurodegeneration in Glaucoma
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“How Tau is sorted into axons and/or depleted from the somatodendritic compartment is still not well understood, although several pathways have been discovered which may operate in parallel [8, 43, 51, 63, 110].”
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“Proper axonal sorting of Tau depends on intact Tau-microtubule interactions [34].”
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“Transfection experiments suggested that the presence of long PD prevents MAP2a/b from entering the axons [6].”
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Microtubule Binding and Trapping at the Tip of Neurites Regulate Tau Motion in Living Neurons
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Artificial confocal microscopy for deep label-free imaging
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“We used two common stains to tag the Tau and MAP2 proteins 44 (see Methods) the ratios of which are a popular model for differentiating the long axon from smaller dendrites.”
MethodThe value of serum tau protein for the diagnosis of intracranial injury in minor head trauma
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Application of novel vectors for GFP-tagging of proteins to study microtubule-associated proteins
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Behind the curtain of tauopathy: a show of multiple players orchestrating tau toxicity
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“So far, several possible mechanisms for the selective localization of tau in the axon and MAP2 in the dendrites have been suggested; first is the locally differing microtubule-binding affinities of the two proteins (Kanai and Hirokawa, 1995), second is the decreased transit of MAP2 in the axons (Kanai and Hirokawa, 19…”
Regulatory mechanisms for the axonal localization of tau protein in neurons
Iwata, M., Watanabe, S., Yamane, A., Miyasaka, T., & Misonou, H. (2019) · Molecular Biology of the Cell · doi:10.1091/mbc.e19-03-0183 · Cited by 51
“This was very surprising from its diffusive nature (Figure 6) and literature reporting the importance of MTBD in the axonal localization and transport of tau (Kanai and Hirokawa, 1995; Utton et al., 2005; Falzone et al., 2009; Weissmann et al., 2009; Li et al., 2011; Scholz and Mandelkow, 2014).”
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Insights into secretory and endocytic membrane traffic using green fluorescent protein chimeras
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“Axonal localization of tau may also be caused by locally regulated microtubule binding (67, 68).”
BackgroundNormal dendritic arborization in spinal motoneurons requires neurofilament subunit L
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“…and Johnston, 1997; Markram et al., 1997), and allow neurons to compartmentally regulate the distribution of a variety of cellular components, including cytoskeleton (Kosik and Finch, 1987; Kanai and Hirokawa, 1995), ion channels, and receptors (Crino and Eberwine, 1996; Johnston et al., 1996).”
BackgroundDephosphorylation of tau during transient forebrain ischemia in the rat
Shackelford, D. A., & Yeh, R. Y. (1998) · Molecular and Chemical Neuropathology · doi:10.1007/bf02815073 · Cited by 40
“Dephosphorylatio n/phosphorylatio n of z is proposed to regulate its binding to microtubules and its preferential localization in axons (Lindwall and Cole, 1984; Drechsel et al., 1992; Biernat et al., 1993; Drewes et al., 1995; Kanai and Hirokawa, 1995 ).”
BackgroundTruncated tau deregulates synaptic markers in rat model for human tauopathy
Jadhav, S., Katina, S., Kováč, A., Kazmerova, Z., Novák, M., & Žilka, N. (2015) · Frontiers in Cellular Neuroscience · doi:10.3389/fncel.2015.00024 · Cited by 40
“This difference may be attributed to the regional binding affinity of tau and the preference to axonal tubulin binding activity in neurons (Kanai and Hirokawa, 1995).”
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Dendritic/Post-synaptic Tau and Early Pathology of Alzheimer’s Disease
Yin, X., Zhao, C., Qiu, Y., Zhou, Z., Bao, J., & Qian, W. (2021) · Frontiers in Molecular Neuroscience · doi:10.3389/fnmol.2021.671779 · Cited by 41
Transgenic Expression of Embryonic MAP2 in Adult Mouse Brain: Implications for Neuronal Polarization
Marsden, K. M., Doll, T., Ferralli, J., Botteri, F. M., & Matus, A. I. (1996) · Journal of Neuroscience · doi:10.1523/jneurosci.16-10-03265.1996 · Cited by 35
Defective axonal transport in motor neuron disease
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“This is achieved partially by selective transport and stabilization of tau (an MAP) in axons and MAP2 in dendrites (Okabe and Hirokawa, 1989; Kanai and Hirokawa, 1995; Hirokawa et al., 1996).”
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“On the protein level, mechanisms suggested for the axonal localization of MAPT included: (1) differential turnover of MAPT in axons and in somatodendritic compartments; (2) tighter binding of MAPT to microtubules in axons than in dendrites [14,15]; (3) preferential axonal transport of MAPT soon after its synthesis in…”
BackgroundMethodSerum Biomarkers of Neurologic Injury in Cardiac Operations
Seco, M., Edelman, J. J., Wilson, M. K., Bannon, P. G., & Vallely, M. P. (2012) · The Annals of Thoracic Surgery · doi:10.1016/j.athoracsur.2012.04.142 · Cited by 32
Schwab, Y., Mouton, J., Chasserot‐Golaz, S., Marty, I., Maulet, Y., & Jover, E. (2001) · Molecular Brain Research · doi:10.1016/s0169-328x(01)00244-3 · Cited by 32
Potentiation of Tau Aggregation by cdk5 and GSK3β
Lee, S., Hall, G. F., & Shea, T. B. (2011) · Journal of Alzheimer s Disease · doi:10.3233/jad-2011-102016 · Cited by 30
MAP2d promotes bundling and stabilization of both microtubules and microfilaments
Ferhat, L., Represa, A., Bernard, A., Ben-Ari, Y., & Khrestchatisky, M. (1996) · Journal of Cell Science · doi:10.1242/jcs.109.5.1095 · Cited by 30
Mechanisms of Axonal Sorting of Tau and Influence of the Axon Initial Segment on Tau Cell Polarity
Zempel, H., & Mandelkow�, E. (2019) · Advances in experimental medicine and biology · doi:10.1007/978-981-32-9358-8_6 · Cited by 30
Teravskis, P. J., Ashe, K. H., & Liao, D. (2020) · The Neuroscientist · doi:10.1177/1073858420916696 · Cited by 31
“Expressing exogenous tau cDNA lacking native introns and untranslated regions (UTR) late in neuronal development leads to homogeneous distribution throughout cultured neurons (Hoover and others 2010; Kanai and Hirokawa 1995).”
BackgroundXie, C., Miyasaka, T., Yoshimura, S., Hatsuta, H., Yoshina, S., Kage-Nakadai, E., Mitani, S., Murayama, S., & Ihara, Y. (2014) · PLoS ONE · doi:10.1371/journal.pone.0089796 · Cited by 28
“Microtubule-associated protein 2 (MAP2) and Tau differ notably in their subcellular localization within neurons: whereas Tau is distributed abundantly in the axonal compartment, MAP2 is found exclusively in the somatodendritic compartment [9,10].”
BackgroundMolecular diversity of neocortical GABAergic interneurones
Blatow, M., Caputi, A., & Monyer, H. (2004) · The Journal of Physiology · doi:10.1113/jphysiol.2004.078584 · Cited by 28
“In addition to detecting whether a protein is expressed in GABAergic interneurones or not, the availability of antibodies also permits localization studies with respect to defined cellular compartments (Kanai & Hirokawa, 1995; Waldvogel et al. 1999).”
BackgroundCellular Biology of Tau Diversity and Pathogenic Conformers
Kang, S., Eskandari‐Sedighi, G., Hromádková, L., Safar, J., & Westaway, D. A. (2020) · Frontiers in Neurology · doi:10.3389/fneur.2020.590199 · Cited by 29
“Unlike MAP2 which is another major species of MAPs found in the neuronal bodies and dendrites, tau is abundant in the axon (35) (Figure 1B).”
BackgroundTau differentially regulates the transport of early endosomes and lysosomes
Balabanian, L., Lessard, D. V., Swaminathan, K., Yaninska, P., Sébastien, M., Wang, S., Stevens, P. W., Wiseman, P. W., Berger, C. L., & Hendricks, A. G. (2022) · Molecular Biology of the Cell · doi:10.1091/mbc.e22-01-0018 · Cited by 26
“Axonal microtubule bundles are heavily decorated with tau, yet robust intracellular transport in axons supports neuronal signaling and homeostasis (Kosik and Finch, 1987; Kanai and Hirokawa, 1995).”
Tau isoforms which contain the domain encoded by exon 6 and their role in neurite elongation
Luo, M., Leski, M. L., & Andreadis, A. (2004) · Journal of Cellular Biochemistry · doi:10.1002/jcb.20029 · Cited by 27
“A tau proline-rich domain directly downstream of exon 6 is a substrate for kinases and indispensable for MT binding [Kanai and Hirokawa, 1995; Mandelkow et al., 1995; Goode et al., 1997].”
BackgroundEnhanced Tau Protein Translation by Hyper-Excitation
Kobayashi, S., Tanaka, T., Soeda, Y., & Takashima, A. (2019) · Frontiers in Aging Neuroscience · doi:10.3389/fnagi.2019.00322 · Cited by 22
KIF5C, a novel neuronal kinesin enriched in motor neurons
Kanai, Y. (2000) · Neuroscience Research · doi:10.1016/s0168-0102(00)81149-9 · Cited by 26
“We constructed deleted fragments of the clones by the conventional 3Ј deletion method using E xonuclease III /mung bean nuclease (TaKaRa, Tokyo, Japan) to read the entire sequence (Kanai et al., 1992; Kanai and Hirokawa , 1995).”
MethodSelf-citationYi, Y., Chang, Y., Li, S., Zhu, J., Wu, Y., Jiang, X., Li, L., Liu, R., Ma, R., & Li, G. (2023) · Brain Research Bulletin · doi:10.1016/j.brainresbull.2023.110685 · Cited by 24
“As the affinity of tau to axonal microtubules is higher than that of postsynaptic structures including dendrites or soma in neurons, tau is predominantly localized to axons(3, 4).”
BackgroundThe specific targeting of guidance receptors within neurons: Who directs the directors?
Allen, J., & Chilton, J. K. (2008) · Developmental Biology · doi:10.1016/j.ydbio.2008.12.013 · Cited by 24
Localization of calcitonin gene-related peptide mRNA in developing olfactory axons
Denis‐Donini, S., Branduardi, P., Campiglio, S., & Carnevali, C. (1998) · Cell and Tissue Research · doi:10.1007/s004410051158 · Cited by 23
“…is active transport along the cytoskeletal components (Singer 1992) and the integrity of microtubules has been shown to be necessary to maintain mRNA localization in different types of neurons (Litman et al. 1994; Bassel et al. 1994; Kanai and Hirokawa 1995; Olink-Coux and Hollenbeck 1996).”
BackgroundWozniak, M., & Limbird, L. E. (1998) · Brain Research · doi:10.1016/s0006-8993(97)01216-x · Cited by 21
Fujiwara, H., Watanabe, S., Iwata, M., Ueda, S., Nobuhara, M., Wada-Kakuda, S., Misonou, H., & Miyasaka, T. (2019) · Biochemical and Biophysical Research Communications - BBRC · doi:10.1016/j.bbrc.2019.10.191 · Cited by 16
Miller, N. M., Shriver, L. P., Bodiga, V. L., Ray, A., Basu, S., Ahuja, R., Jana, A., Pahan, K., & Dittel, B. N. (2013) · ASN NEURO · doi:10.1042/an20120087 · Cited by 19
“To investigate this question, we stained neurons that had been exposed to lytic granules with anti-β3-tubulin (green) to stain microtubules in both axons and dendrites in combination with anti-MAP2 (blue) to mark dendrites and anti-ankyrin G (red) to mark axons (Figure 8) (Boiko et al., 2007; Kaech and Banker, 2006; K…”
BackgroundMethodQuantitative Analysis of MAP-Mediated Regulation of Microtubule Dynamic Instability In Vitro
Kiris, E., Ventimiglia, D., & Feinstein, S. C. (2010) · Methods in cell biology · doi:10.1016/s0091-679x(10)95024-3 · Cited by 19
Kristensson, K. (1996) · Brain Research Bulletin · doi:10.1016/s0361-9230(96)00255-9 · Cited by 19
MAP2 phosphorylation: mechanisms, functional consequences, and emerging insights
Lyu, J., DeMarco, A. G., Sweet, R. A., & Grubisha, M. J. (2025) · Frontiers in Cellular Neuroscience · doi:10.3389/fncel.2025.1610371 · Cited by 20
“Furthermore, it prevents the entry of MAP2A and MAP2B into axons, thereby directing their localization to dendrites (Kanai and Hirokawa, 1995).”
Sayas, C. L., & Ávila, J. (2014) · Journal of Alzheimer s Disease · doi:10.3233/jad-132315 · Cited by 15
Modeling tauopathy: a range of complementary approaches
Hall, G. F., & Yao, J. (2004) · Biochimica et Biophysica Acta (BBA) - Molecular Basis of Disease · doi:10.1016/j.bbadis.2004.10.002 · Cited by 14
“Finally, primary neuron culture is an additional approach that can be taken to ensure that a fully differentiated neuronal phenotype is present, which can be a critical factor in studies of normal functions of tau, such as the developmental sorting of tau and other MAPs between axons and dendrites [28,29,119].”
BackgroundMicrotubule Organization and Microtubule-Associated Proteins (MAPs)
Tortosa, E., Kapitein, L. C., & Hoogenraad, C. C. (2016) · Springer eBooks · doi:10.1007/978-4-431-56050-0_3 · Cited by 13
“…due to a combination of several mechanisms, including dendrite-specific localization of MAP2 mRNA, suppression of MAP2 sorting into axons, and differential protein stability and turnover of MAP2 dendrites (Garner et al. 1988; Hirokawa et al. 1996; Kanai and Hirokawa 1995; Okabe and Hirokawa 1989).”
Metadata
- Authors
- Kanai, Y., & Hirokawa, N.
- Affiliations
- The University of Tokyo (JP)
- Venue
- Neuron
- Publisher
- Elsevier BV
- Published
- 1995-02
- Volume
- 14
- Issue
- 2
- Pages
- 421-432
- ISSN
- 0896-6273 (ISSN-L)
- OpenAlex
- W2039754449
- Cited by
- 144
- References
- 70
- Citations by year
- 2026: 4 · 2025: 2 · 2024: 3 · 2023: 7 · 2022: 2 · 2021: 4 · 2020: 5 · 2019: 7 · 2018: 4 · 2017: 5 · 2016: 4 · 2015: 7 · 2014: 6 · 2013: 4 · 2012: 6
- FWCI
- 5.86
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Neuron (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Ministry of Education, Culture, Sports, Science and Technology
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Alzheimer's disease research and treatments
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Keywords
- tau protein, MAP2, MAP2c, axonal transport, microtubule binding, projection domain, tau phosphorylation, neuronal cytoskeleton, chimeric mutants
- MeSH terms
- Amino Acid Sequence, Animals, Axons, Cells, Cultured, Dendrites, Embryo, Mammalian, Fluorescent Antibody Technique, Microtubule-Associated Proteins, Microtubules, Molecular Sequence Data, Neurons, Protein Binding, Sheep, Spinal Cord, Transfection, Proto-Oncogene Proteins c-myc, tau Proteins, Sequence Homology, Amino Acid, In Situ Hybridization, Mice
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