Lysophosphatidic acid (LPA), an extracellular signaling molecule, influences diverse biological events, including the pathophysiological process induced after ischemic brain injury. However, the molecular mechanisms mediating the pathological change after ischemic stroke remain elusive. Here we report that asparagine endopeptidase (AEP), a lysosomal cysteine proteinase, is regulated by LPA during stroke. AEP proteolytically cleaves tau and generates tauN368 fragments, triggering neuronal death. Inhibiting the generation of LPA reduces the expression of AEP and tauN368, and alleviates neuronal cell death. Together, this evidence indicates that the LPA-AEP pathway plays a key role in the pathophysiological process induced after ischemic stroke. Inhibition of LPA could be a useful therapeutic for treating neuronal injury after stroke.
Experimental Neurology – Elsevier
Published: Aug 1, 2018
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