“…Activation of microglia and brain in ammation are prominent pathological features of AD (110,123) LPS injection into the central nervous system, chicken type II collagen and Freund's adjuvant can induce neuroin ammation and cause learning and memory de cits in animal models of cognitive impairment (122,128,129) and AD (55,118,130). In contrast, salidroside treatment effectively ameliorates LPSinduced de cits in learning, memory and cognition (122,128,129) and signi cantly reduces the levels of proin ammatory cytokines (TNF-α, IL-1β and IL-6) in the serum, hippocampus, and cell supernatant in vivo and in vitro (122,129,131). Furthermore, it markedly decreases the levels of IL-1α, IL-6, IL-17 and IL-12 in the peripheral circulation (128), reduces the release of TNF-α and IL-1β in iso urane-exposed rats (115), and downregulates the expression of IL-6 and TNF-α in APPswe/PS1ΔE9 mice (118).…”