Differential cyclin D1 requirements of proliferating Schwann cells during development and after injury

Mol Cell Neurosci. 2001 Dec;18(6):581-92. doi: 10.1006/mcne.2001.1055.


Neurons regulate Schwann cell proliferation, but little is known about the molecular basis of this interaction. We have examined the possibility that cyclin D1 is a key regulator of the cell cycle in Schwann cells. Myelinating Schwann cells express cyclin D1 in the perinuclear region, but after axons are severed, cyclin D1 is strongly upregulated in parallel with Schwann cell proliferation and translocates into Schwann cell nuclei. During development, cyclin D1 expression is confined to the perinuclear region of proliferating Schwann cells and the analysis of cyclin D1-null mice indicates that cyclin D1 is not required for this type of Schwann cell proliferation. As in the adult, injury to immature peripheral nerves leads to translocation of cyclin D1 to Schwann cell nuclei and injury-induced proliferation is impaired in both immature and mature cyclin D1-deficient Schwann cells. Thus, our data indicate that the molecular mechanisms regulating proliferation of Schwann cells during development or activated by axonal damage are fundamentally different.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Aging / physiology
  • Animals
  • Animals, Newborn
  • Cell Compartmentation / physiology
  • Cell Differentiation / physiology
  • Cell Division / physiology*
  • Cell Nucleus / metabolism
  • Cell Nucleus / ultrastructure
  • Cells, Cultured
  • Cyclin D1 / deficiency*
  • Cyclin D1 / genetics
  • Cytoplasm / metabolism
  • Cytoplasm / ultrastructure
  • Gene Expression Regulation / physiology
  • Immunohistochemistry
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Myelin Sheath / genetics
  • Myelin Sheath / metabolism
  • Nerve Crush
  • Nerve Regeneration / physiology*
  • Peripheral Nerve Injuries
  • Peripheral Nerves / growth & development*
  • Peripheral Nerves / metabolism*
  • Rats
  • Rats, Inbred Strains
  • Schwann Cells / cytology
  • Schwann Cells / metabolism*
  • Sciatic Nerve / growth & development
  • Sciatic Nerve / injuries
  • Sciatic Nerve / metabolism
  • Wallerian Degeneration / metabolism*
  • Wallerian Degeneration / physiopathology


  • Cyclin D1