Ro5-4864 regulates brain testosterone and progesterone levels and improves behavioral deficits in 3xTgAD mice. A, Brain testosterone levels were quantified in limbic structures. Ro5-4864 treatment attenuated GDX-induced testosterone depletion in young-adult 7-month-old mice. B, Brain progesterone levels were quantified in limbic structures. Ro5-4864 treatment increased PROG more than twofold in GDX 7-month-old mice. C, Percentage duration (±SEM) spent exploring the open arm of the EPM, with increased exploration of the open arm indicative of reduced anxiety. D, SAB, represented as percentage alternation (±SEM); both 7-month-old GDX and 24-month-old 3xTgAD mice administered Ro5-4864 exhibited significantly improved SAB performance. #p < 0.05, compared with sham + vehicle. *p < 0.05, compared with all other groups.