Abstract
Dendritic arborization and axon outgrowth are critical steps in the establishment of neural connectivity in the developing brain. Changes in the connectivity underlie cognitive dysfunction in neurodevelopmental disorders. However, molecules and associated mechanisms that play important roles in dendritic and axon outgrowth in the brain are only partially understood. Here, we show that microtubule-actin crosslinking factor 1 (MACF1) regulates dendritic arborization and axon outgrowth of developing pyramidal neurons by arranging cytoskeleton components and mediating GSK-3 signaling. MACF1 deletion using conditional mutant mice and in utero gene transfer in the developing brain markedly decreased dendritic branching of cortical and hippocampal pyramidal neurons. MACF1-deficient neurons showed reduced density and aberrant morphology of dendritic spines. Also, loss of MACF1 impaired the elongation of callosal axons in the brain. Actin and microtubule arrangement appeared abnormal in MACF1-deficient neurites. Finally, we found that GSK-3 is associated with MACF1-controlled dendritic differentiation. Our findings demonstrate a novel role for MACF1 in neurite differentiation that is critical to the creation of neuronal connectivity in the developing brain.
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Acknowledgments
We thank Dr. Robert Norgren for valuable comments on the manuscript. Research reported in this publication was supported by an award from the National Institute of Neurological Disorders and Stroke of the National Institutes of Health under award number R01NS091220, an Institutional Development Award (IDeA) from the National Institute of General Medical Sciences of the National Institutes of Health under award number P20GM103471, a grant from NE DHHS (Stem Cell 2012-05), and a grant from Alzheimer’s Association (NIRP-12-258440) to WYK.
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M.K. and W.K. conceived, designed, performed and analyzed the study. W.K. supervised the work. M.K. and W.K. wrote the paper.
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Supplemental Fig. 1
MACF1 deletion effect on dendrites in cultured neurons (a) Cortical neurons from control (MACF1 loxP/+; Nex-cre) and MACF1 loxP/loxP; Nex-cre brains at E14.5 were cultured for 3 days. Dendrites were visualized by MAP2 immunostaining. (b) The number and the length of dendrites were quantified. n = 75 cells from 3 independent cultures using 3 mice for each condition. Statistical significance was determined by two-tailed Student’s t-test. ***p < 0.001 (PDF 82 kb).
Supplemental Fig. 2
MACF1 deletion effect on callosal axon projection Callosal axons from P0 control (MACF1 loxP/+; Nex-cre) and MACF1 loxP/loxP; Nex-cre brains were examined. Brains were immunostained with an L1 antibody. Reduced intensity of L1 fluorescence was shown in MACF1 loxP/loxP; Nex-cre brains compared with controls (PDF 212 kb).
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Ka, M., Kim, WY. Microtubule-Actin Crosslinking Factor 1 Is Required for Dendritic Arborization and Axon Outgrowth in the Developing Brain. Mol Neurobiol 53, 6018–6032 (2016). https://doi.org/10.1007/s12035-015-9508-4
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DOI: https://doi.org/10.1007/s12035-015-9508-4