Ablation of proliferating microglia does not affect motor neuron degeneration in amyotrophic lateral sclerosis caused by mutant superoxide dismutase.

Publication Type:

Journal Article

Authors:

Gowing, Geneviève; Philips, Thomas; Van Wijmeersch, Bart; Audet, Jean-Nicolas; Dewil, Maarten; Van Den Bosch, Ludo; Billiau, An D; Robberecht, Wim; J-P Julien

Source:

J Neurosci, Volume 28, Issue 41, p.10234-44 (2008)

Keywords:

Amyotrophic Lateral Sclerosis, Animals, Antigens, CD11b, Biomarkers, Cell Aging, Cell Count, Cell Proliferation, Dendritic Cells, Disease Progression, Mice, Mice, Transgenic, Microglia, Motor Neurons, Mutation, Nerve Degeneration, Neuroglia, Phenotype, Spinal Cord, Stem Cells, Superoxide Dismutase, T-Lymphocytes

Abstract:

<p>Microglial activation is a hallmark of all neurodegenerative diseases including amyotrophic lateral sclerosis (ALS). Here, a detailed characterization of the microglial cell population within the spinal cord of a mouse model of familial ALS was performed. Using flow cytometry, we detected three distinct microglial populations within the spinal cord of mice overexpressing mutant superoxide dismutase (SOD1): mature microglial cells (CD11b(+), CD45(low)), myeloid precursor cells (CD11b(+), CD45(int)), and macrophages (CD11b(+), CD45(high)). Characterization of cell proliferation within the CNS of SOD1(G93A) mice revealed that the expansion in microglial cell population is mainly attributable to the proliferation of myeloid precursor cells. To assess the contribution of proliferating microglia in motor neuron degeneration, we generated CD11b-TK(mut-30); SOD1(G93A) doubly transgenic mice that allow the elimination of proliferating microglia on administration of ganciclovir. Surprisingly, a 50% reduction in reactive microglia specifically in the lumbar spinal cord of CD11b-TK(mut-30); SOD1(G93A) doubly transgenic mice had no effect on motor neuron degeneration. This suggests that proliferating microglia-expressing mutant SOD1 are not central contributors of the neurodegenerative process in ALS caused by mutant SOD1.</p>