(A) Representative in vivo T2-weighted images of 10- to 14-month-old mice used for volumetric analyses. The hippocampal volume was significantly smaller in female GLUT3cKO mice. Data are means ± SEM; n = 6–7 mice/group.
(B) Total brain and thalamus volumes calculated from in vivo T2-weighted images of 10- to 14-month-old mice were smaller in female GLUT3cKO mice, while ventricle volume was unchanged. n = 6–7 mice/group.
(C) Representative ex vivo T2-weighted images of 19-month-old mice used for volumetric analyses. CA1, hippocampal, and entire brain volumes were smaller in female GLUT3cKO mice. n = 3 mice/group.
(D and E) [18F]FDG-PET signal from the hippocampus (D) and specifically from the CA1 area (E) was similar between 12- and 14-month-old females and males. n = 6 mice/group.
(F) Representative 13C spectra of 8- to 14-month-old mice showing HP [1-13C]pyruvate and HP [1-13C]lactate levels from a region containing CA1 (red square) for female and male mice. HP [1-13C]lactate-to-pyruvate ratios were significantly lower in female GLUT3cKO mice. n = 6–7 mice/group.
*p % 0.05,**p % 0.01,***p % 0.001 by unpaired t tests.