title: Neuroprotective effect of endogenous cannabinoids on ischemic brain injury induced by the excess microglia-mediated inflammation.
abstract: Increasing evidence has demonstrated the role of endogenous cannabinoids system (ECS) on protecting brain injury caused by ischemia (IMI). Papers reported that microglia-mediated inflammation has become one of the most pivotal mechanisms for IMI. This study was aimed to investigate the potential roles of ECS on neuron protection under microglia-mediated inflammation. Inflammatory cytokines level both in vitro (BV-2 cells) and in vivo (brain tissue from constructed IMI model and brain-isolated microglia) was detected. ECS levels were detected, and its effects on inflammations was also analyzed. Influence of microglia-mediated inflammation on neuron injury was analyzed. Moreover, the effects of ECS on protecting neuron injury were also analyzed. Our results showed that the levels of inflammatory cytokines including TNFα and IL-1β were higher while IKBα was lower in IMI model brain tissue, brain-isolated microglia and BV-2 cells compared to the control. Inflammation was activated in microglia, as well as the activation of ECS characterized by the increasing level of AEA and 2-AG. Furthermore, the activated microglia-mediated self-inflammation performed harmful influence on neurons via suppressing cell viability and inducing apoptosis. Moreover, ECS functioned as a protector on neuron injury though promoting cell proliferation and suppressing cell apoptosis which were caused by the activated BV-2 cells (LPS induced for 3 h). Our data suggested that ECS may play certain neuroprotective effects on microglia-mediated inflammations-induced IMI through anti-inflammatory function.
authors.affiliation: Department of Pharmaceutics, Tangdu Hospital, The Fourth Military Medical University Xi'an, Shaanxi 710038, China.
authors.forename: Shuyun
authors.initials: S
authors.lastname: Guo
authors.affiliation: Institute of Orthopedics, Xijing Hospital, The Fourth Military Medical University Xi'an, Shaanxi 710032, China.
authors.forename: Yanwu
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Department of Anesthesiology, Xijing Hospital, The Fourth Military Medical University Xi'an, Shaanxi 710032, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Ma
authors.affiliation: Department of Burns and Cutaneous Surgery, Xijing Hospital, The Fourth Military Medical University Xi'an, Shaanxi 710032, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.affiliation: Department of Anesthesiology, Xijing Hospital, The Fourth Military Medical University Xi'an, Shaanxi 710032, China.
authors.forename: Binxiao
authors.initials: B
authors.lastname: Su
keywords: Endogenous cannabinoids; excess inflammation; ischemic brain injury; microglia