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Development. 2009 Apr;136(7):1147-57. doi: 10.1242/dev.030254.

Neurexin IV and Wrapper interactions mediate Drosophila midline glial migration and axonal ensheathment.

Author information

1
Department of Biochemistry and Biophysics, The University of North Carolina, Chapel Hill, NC 27599, USA.

Abstract

Glia play crucial roles in ensheathing axons, a process that requires an intricate series of glia-neuron interactions. The membrane-anchored protein Wrapper is present in Drosophila midline glia and is required for ensheathment of commissural axons. By contrast, Neurexin IV is present on the membranes of neurons and commissural axons, and is highly concentrated at their interfaces with midline glia. Analysis of Neurexin IV and wrapper mutant embryos revealed identical defects in glial migration, ensheathment and glial subdivision of the commissures. Mutant and misexpression experiments indicated that Neurexin IV membrane localization is dependent on interactions with Wrapper. Cell culture aggregation assays and biochemical experiments demonstrated the ability of Neurexin IV to promote cell adhesion by binding to Wrapper. These results show that neuronal-expressed Neurexin IV and midline glial-expressed Wrapper act as heterophilic adhesion molecules that mediate multiple cellular events involved in glia-neuron interactions.

PMID:
19270173
PMCID:
PMC2685933
DOI:
10.1242/dev.030254
[Indexed for MEDLINE]
Free PMC Article

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