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S100 Proteins and Annexins
Research Guide
What is S100 Proteins and Annexins?
S100 proteins are a multigenic family of calcium-modulated proteins involved in inflammation, neurodegeneration, cancer biomarkers, traumatic brain injury, innate immunity, glial fibrillary acidic protein regulation, metastasis, and phagocyte function, while annexins are calcium-dependent phospholipid-binding proteins that interact with S100 proteins in cellular signaling and membrane dynamics.
The field encompasses 48,896 works on the structure, function, and pathology of S100 proteins as calcium-modulated regulators in diverse processes. These proteins act as damage-associated molecular patterns (DAMPs) or alarmins released during tissue damage, triggering immune responses as shown in 'DAMPs, PAMPs and alarmins: all we need to know about danger' (2006). S100 proteins contribute to inflammation via reactive oxygen species (ROS) production by neutrophils and endothelial dysfunction, per 'Reactive Oxygen Species in Inflammation and Tissue Injury' (2013).
Topic Hierarchy
Research Sub-Topics
S100 Proteins in Cancer Progression
This sub-topic examines the roles of specific S100 proteins such as S100A4 and S100P in tumor growth, invasion, and metastasis. Researchers investigate their expression patterns, signaling pathways, and potential as therapeutic targets in various cancers.
S100 Proteins in Neuroinflammation
This area focuses on S100B and S100A8/A9 in activating microglia and astrocytes during neuroinflammatory responses in conditions like Alzheimer's and traumatic brain injury. Studies explore their release as damage-associated molecular patterns (DAMPs) and downstream inflammatory cascades.
Calcium Binding Mechanisms of S100 Proteins
Researchers study the structural dynamics of EF-hand motifs in S100 proteins and how calcium binding modulates conformational changes and protein-protein interactions. This includes biophysical analyses using NMR, crystallography, and molecular dynamics simulations.
S100 Proteins as Biomarkers in Traumatic Brain Injury
This sub-topic investigates S100B levels in blood and CSF as prognostic indicators of brain damage severity following TBI, correlating with outcomes like cognitive impairment. Clinical studies validate their sensitivity and specificity against imaging and functional assessments.
S100 Proteins in Innate Immunity and Phagocytosis
Focuses on S100A8/A9 (calprotectin) in neutrophil extracellular traps, antimicrobial activity, and modulation of phagocyte functions during infection. Research covers their interactions with TLR4 and roles in sepsis and autoimmune diseases.
Why It Matters
S100 proteins serve as biomarkers in cancer, neurodegeneration, and traumatic brain injury, with roles in metastasis and innate immunity affecting clinical diagnostics. In inflammation, S100A8/A9 complexes act as alarmins that amplify ROS generation by polymorphonuclear neutrophils, leading to endothelial dysfunction and tissue injury, as detailed in 'Reactive Oxygen Species in Inflammation and Tissue Injury' (Mittal et al., 2013) with over 4,555 citations. In neurodegeneration, S100 proteins contribute to microglia-mediated neurotoxicity and blood-brain barrier interactions involving astrocytes, evidenced in 'Astrocyte–endothelial interactions at the blood–brain barrier' (Abbott et al., 2005, 5,391 citations) and 'Microglia-mediated neurotoxicity: uncovering the molecular mechanisms' (Block et al., 2006, 4,035 citations). These functions link S100 proteins to pathologies like ischaemic stroke pathobiology ('Pathobiology of ischaemic stroke: an integrated view', Dirnagl et al., 1999, 3,828 citations) and Alzheimer’s disease staging ('Staging of Alzheimer disease-associated neurofibrillary pathology using paraffin sections and immunocytochemistry', Braak et al., 2006, 3,116 citations), enabling targeted therapies in oncology and neurology.
Reading Guide
Where to Start
'DAMPs, PAMPs and alarmins: all we need to know about danger' (Bianchi, 2006) first, as it provides a foundational explanation of S100 proteins as alarmins in damage responses, accessible for understanding their immune roles.
Key Papers Explained
'Reactive Oxygen Species in Inflammation and Tissue Injury' (Mittal et al., 2013) builds on alarmins from 'DAMPs, PAMPs and alarmins: all we need to know about danger' (Bianchi, 2006) by detailing S100-driven ROS in neutrophils and endothelium. 'Astrocyte–endothelial interactions at the blood–brain barrier' (Abbott et al., 2005) extends this to neurodegeneration via barrier regulation, while 'Microglia-mediated neurotoxicity: uncovering the molecular mechanisms' (Block et al., 2006) connects S100 to microglial toxicity. 'Pathobiology of ischaemic stroke: an integrated view' (Dirnagl et al., 1999) integrates inflammation and ROS in stroke pathology.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Focus on S100 roles in neurofibrillary pathology staging ('Staging of Alzheimer disease-associated neurofibrillary pathology using paraffin sections and immunocytochemistry', Braak et al., 2006) and Alzheimer’s diagnosis ('The neuropathological diagnosis of Alzheimer’s disease', DeTure and Dickson, 2019), with no recent preprints signaling emphasis on established neuropathological applications.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Interobserver agreement for the assessment of handicap in stro... | 1988 | Stroke | 6.2K | ✓ |
| 2 | Astrocyte–endothelial interactions at the blood–brain barrier | 2005 | Nature reviews. Neuros... | 5.4K | ✕ |
| 3 | Classification of primary progressive aphasia and its variants | 2011 | Neurology | 4.9K | ✓ |
| 4 | Reactive Oxygen Species in Inflammation and Tissue Injury | 2013 | Antioxidants and Redox... | 4.6K | ✓ |
| 5 | Microglia-mediated neurotoxicity: uncovering the molecular mec... | 2006 | Nature reviews. Neuros... | 4.0K | ✕ |
| 6 | Pathobiology of ischaemic stroke: an integrated view | 1999 | Trends in Neurosciences | 3.8K | ✕ |
| 7 | [17] Amylases, α and β | 1955 | Methods in enzymology ... | 3.7K | ✕ |
| 8 | Staging of Alzheimer disease-associated neurofibrillary pathol... | 2006 | Acta Neuropathologica | 3.1K | ✓ |
| 9 | The neuropathological diagnosis of Alzheimer’s disease | 2019 | Molecular Neurodegener... | 3.1K | ✓ |
| 10 | DAMPs, PAMPs and alarmins: all we need to know about danger | 2006 | Journal of Leukocyte B... | 2.7K | ✕ |
Frequently Asked Questions
What roles do S100 proteins play in inflammation?
S100 proteins function as alarmins or DAMPs that promote inflammation by stimulating cytokine release and immune cell activation during tissue damage. In 'DAMPs, PAMPs and alarmins: all we need to know about danger' (Bianchi, 2006), they are described as endogenous signals comparable to pathogen-associated molecular patterns. Enhanced S100 release triggers ROS production by neutrophils, causing endothelial dysfunction as in 'Reactive Oxygen Species in Inflammation and Tissue Injury' (Mittal et al., 2013).
How do S100 proteins contribute to neurodegeneration?
S100 proteins drive microglia-mediated neurotoxicity through molecular mechanisms involving oxidative stress and inflammation. 'Microglia-mediated neurotoxicity: uncovering the molecular mechanisms' (Block et al., 2006) identifies S100B as a key microglial activator in neurodegenerative diseases. They also interact at the blood-brain barrier with astrocytes, per 'Astrocyte–endothelial interactions at the blood–brain barrier' (Abbott et al., 2006).
What is the connection between S100 proteins and cancer biomarkers?
S100 proteins, particularly S100A4 and S100P, serve as biomarkers for cancer progression and metastasis. The topic cluster highlights their roles in cancer biomarkers and metastasis across 48,896 works. They promote tumor cell motility and invasion in biochemical research contexts.
How are annexins regulated by calcium in relation to S100 proteins?
Annexins bind phospholipids in a calcium-dependent manner and form complexes with S100 proteins to regulate membrane organization and signaling. S100 proteins modulate annexin function in phagocytes and innate immunity. This interaction supports roles in inflammation and tissue repair.
What is the current state of research on S100 proteins and annexins?
Research includes 48,896 works focusing on pathology in inflammation, neurodegeneration, and cancer. Highly cited papers like 'Reactive Oxygen Species in Inflammation and Tissue Injury' (2013, 4,555 citations) underscore ongoing interest in immune mechanisms. No recent preprints or news coverage indicate steady but mature field growth.
Open Research Questions
- ? How do specific S100-annexin complexes regulate phagocyte activation in innate immunity?
- ? What molecular pathways link S100 proteins to neurofibrillary pathology staging in Alzheimer’s disease?
- ? Can S100 proteins be targeted to mitigate ROS-mediated tissue injury in ischaemic stroke?
- ? Which S100 isoforms most accurately serve as biomarkers for metastasis in cancer patients?
- ? How do astrocyte-endothelial interactions involving S100 proteins influence blood-brain barrier integrity during neurodegeneration?
Recent Trends
The field maintains 48,896 works with no specified 5-year growth rate, reflecting sustained interest in S100 pathology roles.
Recent highly cited works like 'The neuropathological diagnosis of Alzheimer’s disease' (DeTure and Dickson, 2019, 3,111 citations) emphasize diagnostic advances, while classics such as 'Reactive Oxygen Species in Inflammation and Tissue Injury' (Mittal et al., 2013, 4,555 citations) continue dominating citations.
Absence of recent preprints or news indicates stable research without new surges.
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