Riederer B M, Pellier V, Antonsson B, Di Paolo G, Stimpson S A, Lütjens R, Catsicas S, Grenningloh G
Institut de Biologie Cellulaire et de Morphologie, Lausanne, Switzerland.
Proc Natl Acad Sci U S A. 1997 Jan 21;94(2):741-5. doi: 10.1073/pnas.94.2.741.
Dynamic assembly and disassembly of microtubules is essential for cell division, cell movements, and intracellular transport. In the developing nervous system, microtubule dynamics play a fundamental role during neurite outgrowth, elongation, and branching, but the molecular mechanisms involved are unknown. SCG10 is a neuron-specific protein that is membrane-associated and highly enriched in growth cones. Here we show that SCG10 binds to microtubules, inhibits their assembly, and can induce microtubule disassembly. We also show that SCG10 overexpression enhances neurite outgrowth in a stably transfected neuronal cell line. These data identify SCG10 as a key regulator of neurite extension through regulation of microtubule instability.
微管的动态组装和解聚对于细胞分裂、细胞运动及细胞内运输至关重要。在发育中的神经系统里,微管动力学在神经突生长、延伸及分支过程中发挥着重要作用,但其涉及的分子机制尚不清楚。SCG10是一种神经元特异性蛋白,与细胞膜相关且在生长锥中高度富集。在此我们表明,SCG10与微管结合,抑制其组装,并能诱导微管解聚。我们还表明,在稳定转染的神经元细胞系中,SCG10的过表达可增强神经突生长。这些数据表明,SCG10是通过调节微管不稳定性来作为神经突延伸的关键调节因子。