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Kallikrein-8 inhibition attenuates Alzheimer's disease pathology in mice.

Alzheimer's & dementia : the journal of the Alzheimer's Association (2016-06-22)
Arne Herring, Yvonne Münster, Tamer Akkaya, Sahar Moghaddam, Katharina Deinsberger, Jakob Meyer, Julia Zahel, Eduardo Sanchez-Mendoza, Yachao Wang, Dirk M Hermann, Thomas Arzberger, Sarah Teuber-Hanselmann, Kathy Keyvani
ABSTRACT

Memory loss and increased anxiety are clinical hallmarks of Alzheimer's disease (AD). Kallikrein-8 is a protease implicated in memory acquisition and anxiety, and its mRNA is known to be up-regulated in AD-affected human hippocampus. Therefore, an involvement of Kallikrein-8 in Alzheimer's pathogenesis is conceivable but remains to be proved. We determined the cerebral expression of Kallikrein-8 mRNA and protein during the course of AD in patients and in transgenic mice and tested the impact of Kallikrein-8 inhibition on AD-related pathology in mice and in primary glial cells. Kallikrein-8 mRNA and protein were up-regulated in both species at incipient stages of AD. Kallikrein-8 inhibition impeded amyloidogenic amyloid-precursor-protein processing, facilitated amyloid β (Aβ) clearance across the blood-brain-barrier, boosted autophagy, reduced Aβ load and tau pathology, enhanced neuroplasticity, reversed molecular signatures of anxiety, and ultimately improved memory and reduced fear. Kallikrein-8 is a promising new therapeutic target against AD.

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