AI Article Synopsis
- The study highlights the role of the MUK/DLK/ZPK protein and JNK activity in the radial migration of developing neurons in the mouse neocortex, which is crucial for proper brain development.
- Ectopic expression of MUK/DLK/ZPK in neural precursor cells disrupts radial migration but allows these cells to differentiate into neurons, indicating its influence on both migration and differentiation.
- Furthermore, MUK/DLK/ZPK is shown to affect microtubule organization, suggesting that it regulates neuronal migration through microtubule-related processes.
Article Abstract
The radial migration of differentiating neurons provides an essential step in the generation of laminated neocortex, although its molecular mechanism is not fully understood. We show that the protein levels of a JNK activator kinase, MUK/DLK/ZPK, and JNK activity increase potently and temporally in newly generated neurons in developing mouse telencephalon during radial migration. The ectopic expression of MUK/DLK/ZPK in neural precursor cells in utero impairs radial migration, whereas it allows these cells to leave the ventricular zone and differentiate into neural cells. The MUK/DLK/ZPK protein is associated with dotted structures that are frequently located along microtubules and with Golgi apparatus in cultured embryonic cortical cells. In COS-1 cells, MUK/DLK/ZPK overexpression impairs the radial organization of microtubules without massive depolymerization. These results suggest that MUK/DLK/ZPK and JNK regulate radial cell migration via microtubule-based events.
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| http://dx.doi.org/10.1242/dev.129.19.4483 | DOI Listing |
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