TY - JOUR T1 - Sex-regulated gene dosage effect of PPARα on synaptic plasticity JF - Life Science Alliance JO - Life Sci. Alliance DO - 10.26508/lsa.201800262 VL - 2 IS - 2 SP - e201800262 AU - Nathalie Pierrot AU - Laurence Ris AU - Ilie-Cosmin Stancu AU - Anna Doshina AU - Floriane Ribeiro AU - Donatienne Tyteca AU - Eric Baugé AU - Fanny Lalloyer AU - Liza Malong AU - Olivier Schakman AU - Karelle Leroy AU - Pascal Kienlen-Campard AU - Philippe Gailly AU - Jean-Pierre Brion AU - Ilse Dewachter AU - Bart Staels AU - Jean-Noël Octave Y1 - 2019/04/01 UR - https://www.life-science-alliance.org/content/2/2/e201800262.abstract N2 - Mechanisms driving cognitive improvements following nuclear receptor activation are poorly understood. The peroxisome proliferator–activated nuclear receptor alpha (PPARα) forms heterodimers with the nuclear retinoid X receptor (RXR). We report that PPARα mediates the improvement of hippocampal synaptic plasticity upon RXR activation in a transgenic mouse model with cognitive deficits. This improvement results from an increase in GluA1 subunit expression of the alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor, eliciting an AMPA response at the excitatory synapses. Associated with a two times higher PPARα expression in males than in females, we show that male, but not female, PPARα null mutants display impaired hippocampal long-term potentiation. Moreover, PPARα knockdown in the hippocampus of cognition-impaired mice compromises the beneficial effects of RXR activation on synaptic plasticity only in males. Furthermore, selective PPARα activation with pemafibrate improves synaptic plasticity in male cognition-impaired mice, but not in females. We conclude that striking sex differences in hippocampal synaptic plasticity are observed in mice, related to differences in PPARα expression levels. ER -