The development and maintenance of polarity is paramount to neuronal development and function. The loss of this cell state is realized in many neurodegenerative diseases and ultimately leads to cell death. This project will lead to a greater understanding of the mechanisms responsible for polarization and its maintenance. The goal of this project is to characterize the contribution that the recently discovered LKB1 kinase pathway plays in axon growth and branching through polarized transport of cargo.
Specific Aim 1 will provide the necessary framework for understanding how LKB1 and NUAK1/2 affect the transport of mitochondria in the axon.
Specific Aim 2 will characterize the mechanism by which transport is regulated by determining the downstream components of the kinase pathway. The interaction between LKB1/NUAK and the mitochondrial anchor protein syntaphilin will be the main focus of this aim.
Specific Aim 3 will then attempt to link mitochondrial transport in the axon to proper axon branching and projection within layer 2/3 neurons of the cortex. This research will provide important new knowledge that will be useful in understanding the basic mechanisms at work in many neurodegenerative diseases including Alzheimer's, Huntington's and Parkinson's.

Public Health Relevance

Neuron polarization is required for proper neuron function. Disruption of polarization and the mechanisms that underlie its maintenance are known to be major factors in many neurodegenerative diseases including ALS, Alzheimer's, Huntington's and Parkinson's.

Agency
National Institute of Health (NIH)
Type
Postdoctoral Individual National Research Service Award (F32)
Project #
5F32NS080464-04
Application #
8694114
Study Section
Special Emphasis Panel (ZRG1)
Program Officer
Riddle, Robert D
Project Start
Project End
Budget Start
Budget End
Support Year
4
Fiscal Year
2014
Total Cost
Indirect Cost
Name
Columbia University (N.Y.)
Department
Neurosciences
Type
Schools of Medicine
DUNS #
City
New York
State
NY
Country
United States
Zip Code
10032
Lewis Jr, Tommy L; Courchet, Julien; Polleux, Franck (2013) Cell biology in neuroscience: Cellular and molecular mechanisms underlying axon formation, growth, and branching. J Cell Biol 202:837-48
Courchet, Julien; Lewis Jr, Tommy L; Lee, Sohyon et al. (2013) Terminal axon branching is regulated by the LKB1-NUAK1 kinase pathway via presynaptic mitochondrial capture. Cell 153:1510-25