Cfb — Complement Factor B plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.
Introduction
Cfb — Complement Factor B is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes. [@molecular2018]
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CFB — Complement Factor B
Overview
Mermaid diagram (expand to render)
Cfb — Complement Factor B plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.
Introduction
Cfb — Complement Factor B is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes. [@molecular2018]
Complement Factor B (CFB) is a serine protease that plays a critical role in the alternative pathway of the [complement system](/entities/complement-system). It is synthesized in the liver and is present in the blood as a single-chain polypeptide. Upon activation, CFB is cleaved into two fragments: Ba (small fragment) and Bb (large fragment), which together form the C3 convertase (C3bBb) complex [1]. [@cellular2018]
In the central nervous system, complement proteins including CFB are produced by [astrocytes](/entities/astrocytes) and [microglia](/cell-types/microglia-neuroinflammation), where they participate in synaptic pruning, immune surveillance, and neuroinflammatory responses [2]. [@therapeutic2017]
Disease Associations
Alzheimer's Disease
Genetic variants in the CFB gene have been associated with an increased risk of late-onset Alzheimer's disease (LOAD) [3]
The CFB rs641153 polymorphism (R32Q) shows a protective effect against AD in some populations [4]
Elevated CFB levels have been detected in AD brain tissue and cerebrospinal fluid, suggesting complement activation in disease progression [5]
Complement-mediated synaptic loss is a key feature of AD pathogenesis, and CFB contributes to this process through opsonization and microglial recruitment [6]
Age-Related Macular Degeneration
Strong association between CFB variants and AMD risk [7]
The Y402H variant in CFH (complement factor H) interacts with CFB to modulate AMD susceptibility [8]
Other Neurodegenerative Conditions
Multiple Sclerosis: CFB expression is elevated in demyelinating lesions [9]
[Parkinson's Disease](/diseases/parkinsons-disease): Complement activation contributes to dopaminergic neuron loss [10]
Expression
Brain: CFB is expressed at low levels in healthy brain tissue, primarily by astrocytes and microglia
Regional Distribution: Higher expression in the [hippocampus](/brain-regions/hippocampus) and cerebral [cortex](/brain-regions/cortex)
Upregulation: Strongly induced during neuroinflammation and in neurodegenerative disease states
Cellular Localization: Secreted protein, localizes to [blood-brain barrier](/entities/blood-brain-barrier) and choroid plexus in brain
Key Publications
[Barnum et al., Complement factor B: structure and function (1992)](https://doi.org/10.1016/0165-5728(92)90017-s)
[Schwab & McGeer, Complement activation in AD brain (2008)](https://doi.org/10.3233/JAD-2008-15304)
[Haure-Mirande et al., CFB variants and AD risk (2016)](https://doi.org/10.1038/ncomms10674)
[Yates et al., CFH and CFB variants in AMD (2007)](https://doi.org/10.1056/NEJMoa072618)
[Stephan et al., Complement and synaptic pruning in AD (2012)](https://doi.org/10.1016/j.neuron.2012.03.026)
Cfb — Complement Factor B plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications. [@biomarkers2016]
Background
The study of Cfb — Complement Factor B has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.