ArticleTranslational stroke research2020
Complement C5 Contributes to Brain Injury After Subarachnoid Hemorrhage.
Article in Translational stroke research, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 30 papers, 1 of them a synthesis that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
30 citing papers in PubMed, 1 synthesis or guideline pooled it, 41 citations in OpenAlex.
- Compartmental Cerebrospinal Fluid Events Occurring after Subarachnoid Hemorrhage: An "Heparin Oriented" Systematic Review.International journal of molecular sciences · 2023Pooled it
- Safety and pharmacodynamic efficacy of eculizumab in aneurysmal subarachnoid hemorrhage (CLASH): A phase 2a randomized clinical trial.European stroke journal · 2023Trial
- Clearance of Early Complement Protein From CSF After Aneurysmal Subarachnoid Hemorrhage and Influence on Neurologic Outcome.Neurology(R) neuroimmunology & neuroinflammation · 2026Article
- Red Blood Cell-Derived Exosomes Deliver Complement C5 to Exacerbate Neuroinflammation and Neuronal Injury after Intracerebral Hemorrhage.Inflammation · 2026Article
- Recent research progress and future directions of intracerebral hemorrhage.Frontiers in immunology · 2026Review
- C5a in the peripheral plasma of female fibromyalgia patients is elevated but not related to pain sensitivity as in healthy controls.Scientific reports · 2025Article
- Delayed Cerebral Ischemia After Aneurysmal Subarachnoid Hemorrhage: The Role of the Complement and Innate Immune System.Translational stroke research · 2025Review
- Astrocyte-microglia crosstalk in subarachnoid hemorrhage: mechanisms and treatments.Frontiers in immunology · 2025Review
- Mechanisms of hydrocephalus after intraventricular haemorrhage: a review.Child's nervous system : ChNS : official journal of the International Society for Pediatric Neurosurgery · 2024Review
- Betulin ameliorates neuronal apoptosis and oxidative injury via DJ-1/Akt/Nrf2 signaling pathway after subarachnoid hemorrhage.CNS neuroscience & therapeutics · 2024Article
- Transcriptomics and metabolomics reveal hypothalamic metabolic characteristics and key genes after subarachnoid hemorrhage in rats.Metabolic brain disease · 2024Article
- C5a-C5AR1 axis as a potential trigger of the rupture of intracranial aneurysms.Scientific reports · 2024Article
- Clinical Potential of Immunotherapies in Subarachnoid Hemorrhage Treatment: Mechanistic Dissection of Innate and Adaptive Immune Responses.Aging and disease · 2023Review
- Glial cell response and microthrombosis in aneurysmal subarachnoid hemorrhage patients: An autopsy study.Journal of neuropathology and experimental neurology · 2023Article
- Systemic Inflammation after Aneurysmal Subarachnoid Hemorrhage.International journal of molecular sciences · 2023Review
- Brain edema formation and therapy after intracerebral hemorrhage.Neurobiology of disease · 2023Review
- Advances in Antibody-Based Therapeutics for Cerebral Ischemia.Pharmaceutics · 2022Review
- The blood-brain barrier and the neurovascular unit in subarachnoid hemorrhage: molecular events and potential treatments.Fluids and barriers of the CNS · 2022Review
- Mechanisms of neuroinflammation in hydrocephalus after intraventricular hemorrhage: a review.Fluids and barriers of the CNS · 2022Review
- Inhibition of Prostaglandin E2 Receptor EP3 Attenuates Oxidative Stress and Neuronal Apoptosis Partially by Modulating p38MAPK/FOXO3/Mul1/Mfn2 Pathway after Subarachnoid Hemorrhage in Rats.Oxidative medicine and cellular longevity · 2022Article
Corrections and comments
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Authors and funding
15 authors at 8 institutions in 5 countries.
Funding
Abstract
Previous studies showed that complement activation is associated with poor functional outcome after aneurysmal subarachnoid hemorrhage (SAH). We investigated whether complement activation is underlying brain injury after aneurysmal SAH (n = 7) and if it is an appropriate treatment target. We investigated complement expression in brain tissue of aneurysmal SAH patients (n = 930) and studied the role of common genetic variants in C3 and C5 genes in outcome. We analyzed plasma levels (n = 229) to identify the functionality of a single nucleotide polymorphism (SNP) associated with outcome. The time course of C5a levels was measured in plasma (n = 31) and CSF (n = 10). In an SAH mouse model, we studied the extent of microglia activation and cell death in wild-type mice, mice lacking the C5a receptor, and in mice treated with C5-specific antibodies (n = 15 per group). Brain sections from aneurysmal SAH patients showed increased presence of complement components C1q and C3/C3b/iC3B compared to controls. The complement component 5 (C5) SNP correlated with C5a plasma levels and poor disease outcome. Serial measurements in CSF revealed that C5a was > 1400-fold increased 1 day after aneurysmal SAH and then gradually decreased. C5a in plasma was 2-fold increased at days 3-10 after aneurysmal SAH. In the SAH mouse model, we observed a ≈ 40% reduction in both microglia activation and cell death in mice lacking the C5a receptor, and in mice treated with C5-specific antibodies. These data show that C5 contributes to brain injury after experimental SAH, and support further study of C5-specific antibodies as novel treatment option to reduce brain injury and improve prognosis after aneurysmal SAH.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.