NDLI: C1q-induced LRP1B and GPR6 proteins expressed early in Alzheimer disease mouse models, are essential for the C1q-mediated protection against amyloid-ß neurotoxicity.

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C1q-induced LRP1B and GPR6 proteins expressed early in Alzheimer disease mouse models, are essential for the C1q-mediated protection against amyloid-ß neurotoxicity.

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C1q-induced LRP1B and GPR6 proteins expressed early in Alzheimer disease mouse models, are essential for the C1q-mediated protection against amyloid-ß neurotoxicity.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Dinh, Minhan L. Benavente, Francisca Benoit, Marie E. Vasquez, Osvaldo Hernandez, Michael X. Tenner, Andrea J.
Description	Author Affiliation: Benoit ME ( Department of Molecular Biology and Biochemistry, of California at Irvine, Irvine, California 92697, USA.)
Abstract	Complement protein C1q is induced in the brain in response to a variety of neuronal injuries, including Alzheimer disease (AD), and blocks fibrillar amyloid-ß (fAß) neurotoxicity in vitro. Here, we show that C1q protects immature and mature primary neurons against fAß toxicity, and we report for the first time that C1q prevents toxicity induced by oligomeric forms of amyloid-ß (Aß). Gene expression analysis reveals C1q-activated phosphorylated cAMP-response element-binding protein and AP-1, two transcription factors associated with neuronal survival and neurite outgrowth, and increased LRP1B and G protein-coupled receptor 6(GPR6) expression in fAß-injured neurons. Silencing of cAMP-response element-binding protein, LRP1B or GPR6 expression inhibited C1q-mediated neuroprotection from fAß-induced injury. In addition, C1q altered the association of oligomeric Aß and fAß with neurons. In vivo, increased hippocampal expression of C1q, LRP1B, and GPR6 is observed as early as 2 months of age in the 3 × Tg mouse model of AD, whereas no such induction of LRP1B and GPR6 was seen in C1q-deficient AD mice. In contrast, expression of C1r and C1s, proteases required to activate the classical complement pathway, and C3 showed a significant age-dependent increase only after 10-13 months of age when Aß plaques start to accumulate in this AD model. Thus, our results identify pathways by which C1q, up-regulated in vivo early in response to injury without the coordinate induction of other complement components, can induce a program of gene expression that promotes neuroprotection and thus may provide protection against Aß in preclinical stages of AD and other neurodegenerative processes.
ISSN	00219258
e-ISSN	1083351X
Journal	Journal of Biological Chemistry
Issue Number	1
Volume Number	288
Language	English
Publisher	American Society for Biochemistry and Molecular Biology (United States)
Publisher Date	2013-01-04
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Alzheimer Disease Metabolism Amyloid Beta-Peptides Complement C1q Gene Expression Regulation Receptors, G-Protein-Coupled Physiology Receptors, LDL Tumor Suppressor Proteins Animals Disease Models, Animal Gene Expression Profiling Mice Models, Biological Neurodegenerative Diseases Up-Regulation Research Support, N.I.H., Extramural Biochemistry Molecular Biology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry Molecular Biology

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