Amyloid Β Oligomers Induce Sex-Specific Pathophysiological mGluR5 Signaling in Alzheimer Mice

Abstract

Sex is an important modifier of Alzheimer’s disease (AD) prevalence and progression. Aβ oligomers engage metabotropic glutamate receptor 5 (mGluR5) to mediate pathological signaling in AD.  We find here, that mGluR5 signaling is intrinsically different in male versus female mouse neurons, as mGluR5 agonist and Aβ oligomer treatments inactivate a GSK3β/ZBTB16/ATG14-regulated autophagy pathway via Ser9 phosphorylation of GSK3β in a mGluR5-dependent mechanism in male, but not female, primary neuronal cultures.  These observed sex-specific differences in mGluR5 signaling translate into in vivo differences in mGluR5-dependent pathological signaling in male and female AD mice.  We demonstrate that treatment of male, but not female, APPswe/PS1ΔE9 mice with the mGluR5-selective negative allosteric modulator (NAM), CTEP, improved cognition, reduced Aβ oligomer-mediated pathology, attenuated inflammatory responses and enhanced autophagy.  These differences in male versus female APPswe/PS1ΔE9 responses to CTEP correlate with sex-specific differences in cell surface mGluR5 trafficking.  This study demonstrates clear sex-specific differences in mGluR5 cellular signaling and trafficking in a mouse model of AD and strongly indicates a need to redesign and reanalyze sex-specific AD treatment strategies.

Keywords: Alzheimer's disease, autophagy, mGluR5, neuroglia, sex