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Bcl-x_L increases mitochondrial fission, fusion, and biomass in neurons

¹ W. Harry Feinstone Department of Molecular Microbiology and Immunology, and ² Department of Biostatistics, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21205
³ Department of Neurology and ⁴ Department of Pharmacology and Molecular Sciences, Johns Hopkins School of Medicine, Baltimore, MD 21205
⁵ Department of Neurology, Pittsburgh Institute for Neurodegenerative Diseases, University of Pittsburgh, Pittsburgh, PA 15260
⁶ Department of Biology, and the Integrated Imaging Center, Johns Hopkins University, Baltimore, MD 21218
⁷ Animal Sciences Unit, University of Missouri, Columbia, MO 65211
⁸ Department of Neurogenetics, Max-Planck-Institute of Experimental Medicine, D-37075 Goettingen, Germany
⁹ Department of Internal Medicine, Yale University, New Haven, CT 06520

Correspondence to J. Marie Hardwick: hardwick{at}jhu.edu

Mitochondrial fission and fusion are linked to synaptic activity in healthy neurons and are implicated in the regulation of apoptotic cell death in many cell types. We developed fluorescence microscopy and computational strategies to directly measure mitochondrial fission and fusion frequencies and their effects on mitochondrial morphology in cultured neurons. We found that the rate of fission exceeds the rate of fusion in healthy neuronal processes, and, therefore, the fission/fusion ratio alone is insufficient to explain mitochondrial morphology at steady state. This imbalance between fission and fusion is compensated by growth of mitochondrial organelles. Bcl-x_L increases the rates of both fusion and fission, but more important for explaining the longer organelle morphology induced by Bcl-x_L is its ability to increase mitochondrial biomass. Deficits in these Bcl-x_L–dependent mechanisms may be critical in neuronal dysfunction during the earliest phases of neurodegeneration, long before commitment to cell death.

© 2009 Berman et al.
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