Experimental set-up for monocyte infusions, cognitive evaluations and neurobiological analysis.

At 5 months of age (mice do not display any extracellular plaques), APPSwDI mice were evaluated by the black/white (B/W) box and 8-arm radial maze, which included both training, learning and retention sessions. Following these evaluations, mice were infused intravenously with (I) approx. 5 x 10⁶ young CD11b+ monocytes (isolated from 14 day-old wildtype mice; n = 8) or with (II) saline (n = 7). Every two weeks, animals were tested in the B/W box and 8-arm maze for changes in anxiety and memory, respectively. Intravenous infusions were repeated at months 6 and 7, following cognitive evaluations. At 8 months of age, mice were sacrificed (TAKE) following retention and analyzed.