CXCR4 and CXCR7 Have Distinct Functions in Regulating Interneuron Migration

Overview

Journal Neuron

Publisher Cell Press

Specialty Neurology

Date 2011 Jan 12

PMID 21220099

Citations 158

Authors

Yanling Wang

Guangnan Li

Amelia Stanco

Jason E Long

Dianna Crawford

Gregory B Potter

Samuel J Pleasure

Timothy Behrens

John L R Rubenstein

Affiliations

Soon will be listed here.

Abstract

CXCL12/CXCR4 signaling is critical for cortical interneuron migration and their final laminar distribution. No information is yet available on CXCR7, a newly defined CXCL12 receptor. Here we demonstrated that CXCR7 regulated interneuron migration autonomously, as well as nonautonomously through its expression in immature projection neurons. Migrating cortical interneurons coexpressed Cxcr4 and Cxcr7, and Cxcr7(-/-) and Cxcr4(-/-) mutants had similar defects in interneuron positioning. Ectopic CXCL12 expression and pharmacological blockade of CXCR4 in Cxcr7(-/-) mutants showed that both receptors were essential for responding to CXCL12 during interneuron migration. Furthermore, live imaging revealed that Cxcr4(-/-) and Cxcr7(-/-) mutants had opposite defects in interneuron motility and leading process morphology. In vivo inhibition of Gα(i/o) signaling in migrating interneurons phenocopied the interneuron lamination defects of Cxcr4(-/-) mutants. On the other hand, CXCL12 stimulation of CXCR7, but not CXCR4, promoted MAP kinase signaling. Thus, we suggest that CXCR4 and CXCR7 have distinct roles and signal transduction in regulating interneuron movement and laminar positioning.

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