The NR4A2/VGF pathway fuels inflammation-induced neurodegeneration via promoting neuronal glycolysis

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Abstract

A disturbed balance between excitation and inhibition (E/I balance) is increasingly recognized as a key driver of neurodegeneration in multiple sclerosis (MS), a chronic inflammatory disease of the central nervous system. To understand how chronic hyperexcitability contributes to neuronal loss in MS, we transcriptionally profiled neurons from mice lacking inhibitory metabotropic glutamate signaling with shifted E/I balance and increased vulnerability to inflammation-induced neurodegeneration. This revealed a prominent induction of the nuclear receptor NR4A2 in neurons. Mechanistically, NR4A2 increased susceptibility to excitotoxicity by stimulating continuous VGF secretion leading to glycolysis-dependent neuronal cell death. Extending these findings to people with MS (pwMS), we observed increased VGF levels in serum and brain biopsies. Notably, neuron-specific deletion of Vgf in a mouse model of MS ameliorated neurodegeneration. These findings underscore the detrimental effect of a persistent metabolic shift driven by excitatory activity as a fundamental mechanism in inflammation-induced neurodegeneration.

Authors

Marcel S. Woo, Lukas C. Bal, Ingo Winschel, Elias Manca, Mark Walkenhorst, Bachar Sevgili, Jana K. Sonner, Giovanni Di Liberto, Christina Mayer, Lars Binkle-Ladisch, Nicola Rothammer, Lisa Unger, Lukas Raich, Alexandros Hadjilaou, Barbara Noli, Antonio L. Manai, Vanessa Vieira, Nina Meurs, Ingrid Wagner, Ole Pless, Cristina Cocco, Samuel B. Stephens, Markus Glatzel, Doron Merkler, Manuel A. Friese