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Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disorder that primarily affects motoneurons in the brain and spinal cord. Astrocyte and microglia activation as well as skeletal muscle atrophy are also typical hallmarks of the disease. However, the functional relationship between astrocytes, microglia and skeletal muscle in the pathogenic process remains unclear. Here, we report that the tumor necrosis factor-like weak inducer of apoptosis (Tweak) and its receptor Fn14 are aberrantly expressed in spinal astrocytes and skeletal muscle of SOD1(G93A) mice. We show that Tweak induces motoneuron death, stimulates astrocytic interleukin-6 release and astrocytic proliferation in vitro. The genetic ablation of Tweak in SOD1(G93A) mice significantly reduces astrocytosis, microgliosis and ameliorates skeletal muscle atrophy. The peripheral neutralization of Tweak through antagonistic anti-Tweak antibody ameliorates muscle pathology and notably, decreases microglial activation in SOD1(G93A) mice. Unexpectedly, none of these approaches improved motor function, lifespan and motoneuron survival. Our work emphasizes the multi-systemic aspect of ALS, and suggests that a combinatorial therapy targeting multiple cell types will be instrumental to halt the neurodegenerative process.

Original publication

DOI

10.1093/hmg/ddv094

Type

Journal article

Journal

Hum Mol Genet

Publication Date

15/06/2015

Volume

24

Pages

3440 - 3456

Keywords

Amyotrophic Lateral Sclerosis, Animals, Antigens, CD, Antigens, Differentiation, Myelomonocytic, Astrocytes, Cell Death, Cell Proliferation, Disease Models, Animal, Gene Deletion, Gene Expression Regulation, Gliosis, Interleukin-6, Life Expectancy, Mice, Mice, Knockout, Mice, Transgenic, Microglia, Motor Endplate, Motor Neurons, Muscle, Skeletal, Muscular Atrophy, Mutation, Receptors, Cell Surface, Receptors, Tumor Necrosis Factor, Signal Transduction, Spinal Cord, Superoxide Dismutase, Tumor Necrosis Factors, Up-Regulation