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Complement component C1q mediates mitochondria-driven oxidative stress in neonatal hypoxic-ischemic brain injury

Ten, Vadim S., Yao, Jun, Ratner, Veniamin, Sosunov, Sergey, Fraser, Deborah A., Botto, Marina, Baalasubramanian, Sivasankar, Morgan, Bryan Paul, Silverstein, Samuel, Stark, Raymond, Polin, Richard, Vannucci, Susan J., Pinsky, David and Starkov, Anatoly A. 2010. Complement component C1q mediates mitochondria-driven oxidative stress in neonatal hypoxic-ischemic brain injury. Journal of Neuroscience 30 (6) , pp. 2077-2087. 10.1523/JNEUROSCI.5249-09.2010

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Hypoxic–ischemic (HI) brain injury in infants is a leading cause of lifelong disability. We report a novel pathway mediating oxidative brain injury after hypoxia–ischemia in which C1q plays a central role. Neonatal mice incapable of classical or terminal complement activation because of C1q or C6 deficiency or pharmacologically inhibited assembly of membrane attack complex were subjected to hypoxia–ischemia. Only C1q−/− mice exhibited neuroprotection coupled with attenuated oxidative brain injury. This was associated with reduced production of reactive oxygen species (ROS) in C1q−/− brain mitochondria and preserved activity of the respiratory chain. Compared with C1q+/+ neurons, cortical C1q−/− neurons exhibited resistance to oxygen–glucose deprivation. However, postischemic exposure to exogenous C1q increased both mitochondrial ROS production and mortality of C1q−/− neurons. This C1q toxicity was abolished by coexposure to antioxidant Trolox (6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid). Thus, the C1q component of complement, accelerating mitochondrial ROS emission, exacerbates oxidative injury in the developing HI brain. The terminal complement complex is activated in the HI neonatal brain but appeared to be nonpathogenic. These findings have important implications for design of the proper therapeutic interventions against HI neonatal brain injury by highlighting a pathogenic priority of C1q-mediated mitochondrial oxidative stress over the C1q deposition-triggered terminal complement activation.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Subjects: R Medicine > R Medicine (General)
R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Additional Information: Pdf uploaded in accordance with publisher's policy at (accessed 27/02/2014).
Publisher: Society for Neuroscience
ISSN: 0270-6474
Date of First Compliant Deposit: 30 March 2016
Last Modified: 04 Jun 2017 03:54

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