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Genome-wide analysis of lupus immune complex stimulation of peripheral blood mononuclear cells and how this is regulated by C1q

ABSTRACT: The goal of this study was to determine what genes are up- and down-regulated in response to lupus immune complexes in total peripheral blood mononuclear cells (PBMCs). Our results have shown that novel genes are induced by immune complexes that are likely important for lupus pathogenesis plus that C1q regulates these pathways and induces multiple new pathways not previously identified. Total RNA was isolated from PBMCs from 2 donors after 5 hours with the following condiitons: 1) Unstimulated, 2) Lupus immune complex alone, 3) Lupus immune complex + C1q, 4) C1q alone

ORGANISM(S): Homo sapiens

SUBMITTER: Deanna Santer

PROVIDER: E-GEOD-32279 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Genome-wide analysis of lupus immune complex stimulation of purified CD14+ monocytes and how this response is regulated by C1q

Project description:The goal of this study was to determine what genes are up- and down-regulated in response to lupus immune complexes in purified CD14+ monocyte stimulations. Our results have shown that novel genes are induced by immune complexes but the response is less robust when using purified monocytes versus total PBMCs Total RNA was isolated from CD14+ monocytes from 2 donors after 5 hours with the following conditions: 1) Unstimulated, 2) Lupus immune complex alone, 3) Lupus immune complex + C1q, 4) C1q alone

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Genome-wide analysis of lupus immune complex stimulation and how this response is regulated by C1q

Project description:This SuperSeries is composed of the following subset Series: GSE32278: Genome-wide analysis of lupus immune complex stimulation of purified CD14+ monocytes and how this response is regulated by C1q GSE32279: Genome-wide analysis of lupus immune complex stimulation of peripheral blood mononuclear cells and how this is regulated by C1q Refer to individual Series

2011-12-07 | E-GEOD-32285 | biostudies-arrayexpress

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Genome-wide analysis of lupus immune complex stimulation of purified CD14+ monocytes and how this response is regulated by C1q

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Genome-wide analysis of lupus immune complex stimulation and how this response is regulated by C1q

Project description:Genome-wide analysis of lupus immune complex stimulation and how this response is regulated by C1q

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Lupus autoantibodies initiate a maladaptive homeostasis sustained by HMGB1:RAGE signaling and reversed by LAIR-1:C1q signaling

Project description:Cognitive impairment is a frequent manifestation of neuropsychiatric systemic lupus erythematosus (NPSLE), present in up to 80% of patients and leading to a diminished quality of life. We have developed a model of lupus-like cognitive impairment which is initiated when anti-DNA, anti-N-methyl D-aspartate receptor (NMDAR) cross- reactive antibodies, which are present in 30% of SLE patients, penetrate the hippocampus. This leads to immediate, self-limited excitotoxic death of CA1 pyramidal neurons followed by loss of dendritic arborization in the remaining CA1 pyramidal neurons and impaired spatial memory. Both microglia and C1q are required for dendritic loss. Here we show that this pattern of hippocampal injury creates a maladaptive homeostasis that is sustained for at least one year. It requires HMGB1 secretion by neurons to bind RAGE, a receptor for HMGB1 expressed on microglia, and leads to decreased expression of microglial LAIR-1, an inhibitory receptor for C1q. The angiotensin converting enzyme (ACE) inhibitor captopril, which can restore a healthy homeostasis, microglial quiescence, and intact spatial memory, leads to upregulation of LAIR-1. This paradigm highlights HMGB1:RAGE and C1q:LAIR-1 interactions as pivotal pathways in the microglial–neuronal interplay that defines a physiologic versus a maladaptive homeostasis.

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Project description:Neuroimmune interactions mediate intercellular communication and underlie critical brain functions. Microglia, CNS-resident macrophages, modulate the brain through direct physical interactions and the secretion of molecules. One such secreted factor, the complement protein C1q, contributes to complement-mediated synapse elimination in development and disease models, yet brain C1q protein levels increase significantly throughout aging. How age-related C1q affects neuronal function has not been demonstrated. Here we report that C1q interacts with neuronal ribonucleoprotein (RNP) complexes in an age-dependent manner. Purified C1q protein undergoes RNA-dependent liquid-liquid phase separation (LLPS) in vitro, and the interaction of C1q with neuronal RNP complexes in vivo is dependent on RNA and endocytosis. Mice lacking C1q have age-specific alterations in neuronal protein synthesis in vivo and impaired fear memory extinction. Together, our findings reveal a biophysical property of C1q that underlies RNA- and age-dependent neuronal interactions and demonstrate a unique role of C1q in critical intracellular neuronal processes.

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