Biological activity of neurotrophins is dependent on recruitment of Rac1 to lipid rafts
2004; Elsevier BV; Volume: 327; Issue: 1 Linguagem: Inglês
10.1016/j.bbrc.2004.11.151
ISSN1090-2104
AutoresMasashi Fujitani, Akiko Honda, Katsuhiko Hata, Satoru Yamagishi, Masaya Tohyama, Toshihide Yamashita,
Tópico(s)Protein Kinase Regulation and GTPase Signaling
ResumoThe Rho family of small GTPases, key regulators of the actin cytoskeleton in eukaryotic cells, is implicated in the control of neuronal morphology. Here, we report that neurotrophin dependent cytoskeletal changes, characteristic of the phenotype of Rac1, in the hippocampal neurons or PC12 cells are inhibited by the disruption of lipid raft integrity. Activation of Rac1 induced by NGF is impaired in cholesterol-depleted PC12 cells. Pretreatment with gammaGTP shifted significant amount of Rac1, presumably in a GTP-bound form, from non-raft to raft fractions. Proper recruitment of activated Rac1 to lipid rafts, structures that represent specialized signaling organelles, is of fundamental importance in determining neurotrophins' bioactivity.
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