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Developmental Brain Science Group, RIKEN Brain Science Institute (BSI), Wako, Saitama, 351-0198, Japan

Address correspondence to Hiroyuki Kamiguchi, Developmental Brain Science Group, RIKEN Brain Science Institute (BSI), 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan. Tel.: 81-48-467-6137. Fax: 81-48-467-9744. E-mail: kamiguchi{at}brain.riken.go.jp

Motility of nerve growth cones (GCs) is regulated by region-specific activities of cell adhesion molecules (CAMs). CAM activities could be modified by their localization to detergent-resistant membranes (DRMs), specialized microdomains enriched in signaling molecules. This paper deals with a question of whether DRMs are involved in GC migration stimulated by three CAMs; L1, N-cadherin (Ncad), and ß1 integrin. We demonstrate that L1 and Ncad are present in DRMs, whereas ß1 integrin is exclusively detected in non-DRMs of neurons and that localization of L1 and Ncad to DRMs is developmentally regulated. GC migration mediated by L1 and Ncad but not by ß1 integrin is inhibited after DRM disruption by micro-scale chromophore-assisted laser inactivation (micro-CALI) of GM1 gangliosides or by pharmacological treatments that deplete cellular cholesterol or sphingolipids, essential components for DRMs. Characteristic morphology of GCs induced by L1 and Ncad is also affected by micro-CALI–mediated DRM disruption. Micro-CALI within the peripheral domain of GCs, or even within smaller areas such as the filopodia and the lamellipodia, is sufficient to impair their migration. However, micro-CALI within the central domain does not affect GC migration. These results demonstrate the region-specific involvement of DRMs in CAM-dependent GC behavior.

Key Words: lipid raft; micro-CALI; neuron; L1; N-cadherin

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