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• W2076271128 abstract "Loss-of-function mutations in the KRIT1 gene (CCM1) have been associated with the pathogenesis of cerebral cavernous malformations (CCM), a major cerebrovascular disease. However, KRIT1 functions and CCM pathogenetic mechanisms remain incompletely understood. Indeed, recent experiments in animal models have clearly demonstrated that the homozygous loss of KRIT1 is not sufficient to induce CCM lesions, suggesting that additional factors are necessary to cause CCM disease. Previously, we found that KRIT1 is involved in the maintenance of the intracellular reactive oxygen species (ROS) homeostasis to prevent ROS-induced cellular dysfunctions, including a reduced ability to maintain a quiescent state. Here, we show that KRIT1 loss of function leads to enhanced expression and phosphorylation of the redox-sensitive transcription factor c-Jun, as well as induction of its downstream target COX-2, in both cellular models and human CCM tissues. Furthermore, we demonstrate that c-Jun upregulation can be reversed by either KRIT1 re-expression or ROS scavenging, whereas KRIT1 overexpression prevents forced upregulation of c-Jun induced by oxidative stimuli. Taken together with the reported role of c-Jun in vascular dysfunctions triggered by oxidative stress, our findings shed new light on the molecular mechanisms underlying KRIT1 function and CCM pathogenesis." @default.
• W2076271128 created "2016-06-24" @default.
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• W2076271128 date "2014-03-01" @default.
• W2076271128 modified "2023-10-02" @default.
• W2076271128 title "KRIT1 loss of function causes a ROS-dependent upregulation of c-Jun" @default.
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• W2076271128 doi "https://doi.org/10.1016/j.freeradbiomed.2013.11.020" @default.
• W2076271128 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3994518" @default.
• W2076271128 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24291398" @default.
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