Bergmann glia and the recognition molecule CHL1 organize GABAergic axons and direct innervation of Purkinje cell dendrites.

Journal Article (Journal Article)

The geometric and subcellular organization of axon arbors distributes and regulates electrical signaling in neurons and networks, but the underlying mechanisms have remained elusive. In rodent cerebellar cortex, stellate interneurons elaborate characteristic axon arbors that selectively innervate Purkinje cell dendrites and likely regulate dendritic integration. We used GFP BAC transgenic reporter mice to examine the cellular processes and molecular mechanisms underlying the development of stellate cell axons and their innervation pattern. We show that stellate axons are organized and guided towards Purkinje cell dendrites by an intermediate scaffold of Bergmann glial (BG) fibers. The L1 family immunoglobulin protein Close Homologue of L1 (CHL1) is localized to apical BG fibers and stellate cells during the development of stellate axon arbors. In the absence of CHL1, stellate axons deviate from BG fibers and show aberrant branching and orientation. Furthermore, synapse formation between aberrant stellate axons and Purkinje dendrites is reduced and cannot be maintained, leading to progressive atrophy of axon terminals. These results establish BG fibers as a guiding scaffold and CHL1 a molecular signal in the organization of stellate axon arbors and in directing their dendritic innervation.

Full Text

Duke Authors

Cited Authors

  • Ango, F; Wu, C; Van der Want, JJ; Wu, P; Schachner, M; Huang, ZJ

Published Date

  • April 29, 2008

Published In

Volume / Issue

  • 6 / 4

Start / End Page

  • e103 -

PubMed ID

  • 18447583

Pubmed Central ID

  • PMC2689695

Electronic International Standard Serial Number (EISSN)

  • 1545-7885

Digital Object Identifier (DOI)

  • 10.1371/journal.pbio.0060103

Language

  • eng

Conference Location

  • United States