Cited by 27Hereditary Neurological DisordersCellular transport and secretionNerve injury and regeneration

Schwann cell‐specific deletion of the endosomal PI 3‐kinase Vps34 leads to delayed radial sorting of axons, arrested myelination, and abnormal ErbB2‐ErbB3 tyrosine kinase signaling

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Logan, Anne M., Mammel, Anna E., Robinson, Danielle C., Chin, Andrea L., Condon, Alec F., Robinson, Fred L.·2017·Glia

Abstract

The PI 3‐kinase Vps34 (Pik3c3) synthesizes phosphatidylinositol 3‐phosphate (PI3P), a lipid critical for both endosomal membrane traffic and macroautophagy. Human genetics have implicated PI3P dysregulation, and endosomal trafficking in general, as a recurring cause of demyelinating Charcot‐Marie‐Tooth (CMT) peripheral neuropathy. Here, we investigated the role of Vps34, and PI3P, in mouse Schwann cells by selectively deleting Vps34 in this cell type. Vps34‐Schwann cell knockout (Vps34 SCKO) mice show severe hypomyelination in peripheral nerves. Vps34–/– Schwann cells interact abnormally with axons, and there is a delay in radial sorting, a process by which large axons are selected for myelination. Upon reaching the promyelinating stage, Vps34–/– Schwann cells are significantly impaired in the elaboration of myelin. Nerves from Vps34 SCKO mice contain elevated levels of the LC3 and p62 proteins, indicating impaired autophagy. However, in the light of recent demonstrations that autophagy is dispensable for myelination, it is unlikely that hypomyelination in Vps34 SCKO mice is caused by impaired autophagy. Endosomal trafficking is also disturbed in Vps34–/– Schwann cells. We investigated the activation of the ErbB2/3 receptor tyrosine kinases in Vps34 SCKO nerves, as these proteins, which play essential roles in Schwann cell myelination, are known to traffic through endosomes. In Vps34 SCKO nerves, ErbB3 was hyperphosphorylated on a tyrosine known to be phosphorylated in response to neuregulin 1 exposure. ErbB2 protein levels were also decreased during myelination. Our findings suggest that the loss of Vps34 alters the trafficking of ErbB2/3 through endosomes. Abnormal ErbB2/3 signaling to downstream targets may contribute to the hypomyelination observed in Vps34 SCKO mice.

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  • Conditional deletion of Pik3c3 in murine Schwann cells results in hypomyelination and non-cell autonomous disruption of neuronal autophagic flux and dysregulated neuronal trafficking of ERBB2 or ERBB3 receptor tyrosine kinases.

    “Furthermore, conditional deletion of Pik3c3 in murine Schwann cells not only results in hypomyelination, but also in non-cell autonomous disruption of neuronal autophagic flux and dysregulated neuronal trafficking of ERBB2 or ERBB3 receptor tyrosine kinases [460].”

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Authors
Logan, A. M., Mammel, A. E., Robinson, D. C., Chin, A. L., Condon, A. F., & Robinson, F. L.
Affiliations
Oregon Health & Science University (US)
Corresponding author
Robinson, Fred L.
Venue
Glia
Publisher
Wiley
Published
2017-06-15
Volume
65
Issue
9
Pages
1452-1470
ISSN
  • 0894-1491 (ISSN-L)
  • 1098-1136
OpenAlex
W2625542865
Cited by
27
References
77
Citations by year
2026: 1 · 2025: 4 · 2024: 3 · 2023: 3 · 2022: 4 · 2021: 4 · 2020: 3 · 2019: 2 · 2018: 2 · 2017: 1
FWCI
1.07
Type
journal article
Language
en
Open access
Locations
  • Glia (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Institute of Neurological Disorders and Stroke (NS057903 and NS086812)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Hereditary Neurological Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Nerve injury and regeneration
Keywords
Vps34, PIK3C3, phosphatidylinositol 3-phosphate, Schwann cells, myelination, hypomyelination, endosomal trafficking, autophagy, ERBB2, HER3, neuregulin-1, receptor tyrosine kinase signaling, Charcot-Marie-Tooth disease, peripheral neuropathy
MeSH terms
Neuronal Outgrowth, Animals, Autophagy, Axons, Female, Male, Mice, Inbred C57BL, Motor Activity, Peripheral Nerves, Phosphorylation, Endosomes, Schwann Cells, Sciatic Nerve, Signal Transduction, Mice, Knockout, Receptor, ErbB-2, Erb-b2 Receptor Tyrosine Kinases, Receptor, ErbB-3, Cell Proliferation, Mice, 129 Strain, Class III Phosphatidylinositol 3-Kinases

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