IL5 and Alzheimer disease: The levels of T-helper 2 (Th2) cytokines (IL-5 and IL-13) in BALF from AD + Df/Df mice were significantly decreased by Prl treatment (p < 0.05; Figure 3), while the Th1 cytokine (IFN-γ) and inflammatory cytokines’ (IL-6, MIP-2/CXCL2, and KC/CXCL1) levels were not significantly decreased after Prl treatment.