Suppression of Lipopolysaccharide-Induced Microglial Activation by a Benzothiazole Derivative

We previously reported that KHG21834, a benzothiazole derivative, attenuates the beta-amyloid (Aβ)-induced degeneration of both cortical and mesencephalic neurons in vitro. Central nervous system inflammation mediated by activated microglia is a key event in the development of neurodegenerative disease. In this study, we show that KHG21834 suppresses inflammation-mediated cytokine upregulation. Specifically, KHG21834 induces significant reductions in the lipopolysaccharide-induced activation of microglia and production of proinflammatory mediators such as tumor necrosis factor-α, interlukin-1β, nitric oxide,and inducible nitric oxide synthase. In addition, KHG21834blocks the expression of mitogen-activated protein kinases,including ERK, p38 MAPK, JNK, and Akt. In vivo intracerebroventricular infusion of KHG21834 also leads to decreases the level of interleukin-1β and tumor necrosis factor-α in brain. These results, in combination with our previous findings on Aβ-induced degeneration, support the potential therapeutic efficacy of KHG21834 for the treatment of neurodegenerative disorders via the targeting of key glial activation pathways.