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  2. Neuronal paxillin and drebrin mediate BDNF-induced force transduction and growth cone turning in a soft-tissue-like environment

Neuronal paxillin and drebrin mediate BDNF-induced force transduction and growth cone turning in a soft-tissue-like environment

  • Cell Rep. 2022 Aug 16;40(7):111188. doi: 10.1016/j.celrep.2022.111188.
Chen Chen 1 Chien-Hsin Chu 1 Ying Chu 1 Ting-Ya Chang 1 Sheng-Wen Chen 1 Shu-Yang Liang 1 Yun-Chi Tsai 2 Bi-Chang Chen 2 Hsiung-Lin Tu 3 Pei-Lin Cheng 4
Affiliations

Affiliations

  • 1 Institute of Molecular Biology, Academia Sinica, 128 Academia Road, Section 2, Nankang, Taipei 11529, Taiwan.
  • 2 Research Center for Applied Sciences, Academia Sinica, 128 Academia Road, Section 2, Nankang, Taipei 11529, Taiwan.
  • 3 Institute of Chemistry, Academia Sinica, 128 Academia Road, Section 2, Nankang, Taipei 11529, Taiwan.
  • 4 Institute of Molecular Biology, Academia Sinica, 128 Academia Road, Section 2, Nankang, Taipei 11529, Taiwan. Electronic address: plcheng@imb.sinica.edu.tw.
Abstract

Soft tissue environments govern neuronal morphogenesis. However, the precise molecular mechanisms underlying chemotropism-directed axonal growth cone movement in extremely soft environments remain unclear. Here, we show that drebrin, a growth cone T-zone protein, modulates growth cone turning in response to brain-derived neurotrophic factor (BDNF) coated on a soft substrate. Structurally, axonal growth cones of rodent hippocampal neurons grown on 0.1 kPa hydrogels possess an expanded T zone in which drebrin is highly integrated with both F-actin and microtubules. Biochemically, we identify paxillin as interacting with drebrin in cells grown on 0.1 kPa hydrogels but not on glass coverslips. When grown on 0.1 kPa substrates, growth cones asymmetrically exposed to BDNF-bound stripes exhibit enhanced paxillin-drebrin interaction on the side facing the stripes, an activity that is PKA and AAK1 dependent but independent of Src kinase. Functionally, we show that BDNF-induced growth cone turning and force generation on soft substrates require drebrin phosphorylation and paxillin-drebrin association.

Keywords

BDNF; CP: Cell biology; CP: Neuroscience; Src kinase-independent activity; drebrin; force generation; growth cone T zone; microtubule bundles; paxillin; soft substrates.

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