Interleukin-12 signaling drives Alzheimer's disease pathology through disrupting neuronal and oligodendrocyte homeostasis.

IF 17 Q1 CELL BIOLOGY Nature aging Pub Date : 2025-03-13 DOI:10.1038/s43587-025-00816-2
Shirin Schneeberger, Seung Joon Kim, Maria N Geesdorf, Ekaterina Friebel, Pascale Eede, Marina Jendrach, Anastasiya Boltengagen, Caroline Braeuning, Torben Ruhwedel, Andreas J Hülsmeier, Niclas Gimber, Marlene Foerster, Juliane Obst, Myrto Andreadou, Sarah Mundt, Jan Schmoranzer, Stefan Prokop, Wiebke Kessler, Tanja Kuhlmann, Wiebke Möbius, Klaus-Armin Nave, Thorsten Hornemann, Burkhard Becher, Julia M Edgar, Nikos Karaiskos, Christine Kocks, Nikolaus Rajewsky, Frank L Heppner
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Abstract

Neuroinflammation including interleukin (IL)-12/IL-23-signaling is central to Alzheimer's disease (AD) pathology. Inhibition of p40, a subunit of IL-12/IL-23, attenuates pathology in AD-like mice; however, its signaling mechanism and expression pattern remained elusive. Here we show that IL-12 receptors are predominantly expressed in neurons and oligodendrocytes in AD-like APPPS1 mice and in patients with AD, whereas IL-23 receptor transcripts are barely detectable. Consistently, deletion of the IL-12 receptor in neuroectodermal cells ameliorated AD pathology in APPPS1 mice, whereas removal of IL-23 receptors had no effect. Genetic ablation of IL-12 signaling alone reverted the loss of mature oligodendrocytes, restored myelin homeostasis, rescued the amyloid-β-dependent reduction of parvalbumin-positive interneurons and restored phagocytosis-related changes in microglia of APPPS1 mice. Furthermore, IL-12 protein expression was increased in human AD brains compared to healthy age-matched controls, and human oligodendrocyte-like cells responded profoundly to IL-12 stimulation. We conclude that oligodendroglial and neuronal IL-12 signaling, but not IL-23 signaling, are key in orchestrating AD-related neuroimmune crosstalk and that IL-12 represents an attractive therapeutic target in AD.

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