NF-kappaB p105 Protein
Pathway Diagram
Mermaid diagram (expand to render)
<table class="infobox infobox-protein">
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<th class="infobox-header" colspan="2">NF-kappaB p105 Protein</th>
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<td class="label">Symbol</td>
<td><strong>NFKB1</strong></td>
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<td class="label">Full Name</td>
<td>NF-kappaB p105</td>
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<td class="label">Type</td>
<td>Protein</td>
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<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/?query=NFKB1" target="_blank">Search UniProt</a></td>
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<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/alzheimer's-disease" style="color:#ef9a9a">Alzheimer's Disease</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a></td>
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<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">217 edges</a></td>
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</table>
Introduction
Nf Κb P105 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Overview
[NF-kappaB p105](/proteins/nfkb1-protein) is the precursor form encoded by [NFKB1](/genes/nfkb1). Proteasome-dependent processing of p105 generates the p50 subunit, a core component of canonical NF-kappaB transcriptional complexes that regulate inflammatory, stress-response, and survival gene programs in the central nervous system.[@hayden2012][@kaltschmidt2009] In neurodegeneration, p105/p50 signaling is a major convergence node linking [microglia](/cell-types/microglia-in-neuroinflammation), [astrocytes](/cell-types/reactive-astrocytes-a2), and vulnerable [neurons](/entities/neurons) to sustained cytokine signaling and synaptic dysfunction.[@heneka2018][@lian2015]
Domain Architecture and Processing Logic
p105 contains an N-terminal Rel homology domain (RHD) responsible for DNA binding/dimerization and a C-terminal ankyrin-repeat region that has IkappaB-like inhibitory properties. This dual architecture allows p105 to function both as a precursor to p50 and as a scaffold-like inhibitor retaining Rel proteins in the cytoplasm until pathway activation cues are received.[@hayden2012][@oeckinghaus2065]
Upon receptor-driven signaling (for example through TNF, IL-1, or pattern-recognition pathways), IKK-mediated phosphorylation and ubiquitin-dependent proteolysis drive partial processing of p105 to p50 or complete degradation, thereby changing the transcriptional state of the cell.[@kaltschmidt2009][@oeckinghaus2065] Coupling to the [ubiquitin-proteasome system](/cell-types/ubiquitin-proteasome-system) makes this step sensitive to proteostasis stress, a recurrent feature of AD and PD brains.[@ciechanover2017]
NF-kappaB p105 in CNS Cell Types
In [microglia](/cell-types/microglia-neuroinflammation), canonical NF-kappaB signaling amplifies production of IL-1beta, TNF, and chemokines that reinforce neuroinflammatory loops and can accelerate synapse loss in disease contexts.[@heneka2018][@glass2010] In [astrocytes](/entities/astrocytes), p50-containing complexes help control transition toward reactive states that alter glutamate handling, trophic support, and [blood-brain barrier](/entities/blood-brain-barrier) communication.[@lian2015][@colombo2016] In neurons, activity-dependent NF-kappaB signaling has context-dependent roles: it can support survival and plasticity under physiological conditions but becomes maladaptive under chronic inflammatory or oxidative stress.[@kaltschmidt2009][@mattson2001]
Alzheimer's Disease Mechanistic Relevance
AD-relevant stimuli including soluble [Aβ](/proteins/amyloid-beta) oligomers and fibrillar amyloid activate NF-kappaB signaling in glia and neurons. This increases expression of inflammatory mediators and can feed forward into [APP](/entities/app-protein)-processing and [tau](/proteins/tau)-phosphorylation pathways.[@glass2010][@wang2015] Cross-talk between [APP](/genes/app)/[NCT](/genes/nct)-dependent proteolytic systems and NF-kappaB-regulated transcription is an active area of study, especially for understanding stage-specific transitions from compensatory to toxic inflammation.[@wang2015][@selkoe2016]
Beyond inflammation, NF-kappaB influences genes controlling synaptic plasticity and mitochondrial resilience. Dysregulated p105/p50 signaling may therefore contribute simultaneously to cognitive decline and neuroimmune activation in AD.[@kaltschmidt2009][@mattson2001]
Parkinson's Disease and Synucleinopathies
In PD and related synucleinopathies, [alpha-synuclein](/proteins/alpha-synuclein) species activate microglial pattern-recognition pathways that converge on IKK-NF-kappaB signaling. Elevated p50/Rel complexes are observed in affected regions, consistent with chronic innate immune activation and progressive dopaminergic stress.[@tansey2019][@hirsch2009] These mechanisms intersect with mitochondrial dysfunction, lysosomal impairment, and oxidant stress, linking inflammatory transcriptional programs to neuronal vulnerability in the substantia nigra.[@hirsch2009][@ryan2015]
Therapeutic Implications
Direct global NF-kappaB blockade has been limited by broad immunologic and homeostatic liabilities. Current translational strategies are shifting toward cell-type-selective modulation, upstream trigger control (for example inflammasome or TLR signaling), or context-tuned pathway dampening rather than full suppression.[@heneka2018][@leng2021] Mapping p105-specific processing checkpoints may provide finer control points, particularly where proteasome state or scaffold function determines inflammatory set point.
Open Questions
Which p105 processing states in human brain best predict transition from adaptive to maladaptive neuroinflammation?
Can microglia- or astrocyte-selective NF-kappaB modulation preserve host defense while reducing neurotoxicity?
How do p105-dependent transcriptional programs interact with amyloid and synuclein proteostasis pathways over disease stage?See Also
- [NFKB1 Gene](/genes/nfkb1)
- [NCT (Nicastrin) Gene](/genes/nct)
- [Microglia in Chronic Neuroinflammation](/cell-types/microglia-in-neuroinflammation)
- [Reactive Astrocytes (A2 Phenotype)](/cell-types/reactive-astrocytes-a2)
- [Parkinson's Disease](/diseases/parkinsons-disease)
- [Alzheimer's Disease](/diseases/alzheimers-disease)
Background
The study of Nf Κb P105 Protein 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.
External Links
- [PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
- [Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
- [Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data
References
[Hayden MS, Ghosh S, NF-kappaB, the first quarter-century: remarkable progress and outstanding questions (2012)](https://doi.org/10.1101/gad.183434.111)
[Kaltschmidt B, Kaltschmidt C, NF-kappaB in the nervous system (2009)](https://doi.org/10.1101/cshperspect.a001271)
[Heneka MT, McManus RM, Latz E, Inflammasome signalling in brain function and neurodegenerative disease (2018)](https://doi.org/10.1038/s41583-018-0055-7)
[Lian H, Yang L, Cole A, et al, NFkappaB-activated astroglial release of complement C3 compromises neuronal morphology and function (2015)](https://doi.org/10.1016/j.neuron.2015.08.018)
[Oeckinghaus A, Hayden MS, Ghosh S, Crosstalk in NF-kappaB signaling pathways (2065)](https://doi.org/10.1038/ni.2065)
[Ciechanover A, Kwon YT, Protein quality control by molecular chaperones in neurodegeneration (2017)](https://doi.org/10.1016/j.neuron.2017.05.007)
[Glass CK, Saijo K, Winner B, et al, Mechanisms underlying inflammation in neurodegeneration (2010)](https://doi.org/10.1016/j.cell.2010.02.016)
[Colombo E, Farina C, Astrocytes: key regulators of neuroinflammation (2016)](https://doi.org/10.1016/j.tins.2016.10.006)
[Mattson MP, Camandola S, NF-kappaB in neuronal plasticity and neurodegenerative disorders (2001)](https://pubmed.ncbi.nlm.nih.gov/18278371/)
[Wang WY, Tan MS, Yu JT, Tan L, Role of pro-inflammatory cytokines released from microglia in Alzheimer's disease (2015)](https://doi.org/10.1111/nan.12157)
[Selkoe DJ, Hardy J, The amyloid hypothesis of Alzheimer's disease at 25 years (2016)](https://doi.org/10.1016/S0092-8674(16)
[Tansey MG, Romero-Ramos M, Immune system responses in Parkinson's disease: early and dynamic (2019)](https://doi.org/10.1038/nrn3883)
[Hirsch EC, Hunot S, Neuroinflammation in Parkinson's disease: a target for neuroprotection? (2009)](https://doi.org/10.1016/j.tins.2009.09.003)
[Ryan BJ, Hoek S, Fon EA, Wade-Martins R, Mitochondrial dysfunction and mitophagy in Parkinson's (2015)](https://doi.org/10.1016/j.neurobiolaging.2015.08.012)
[Leng F, Edison P, Neuroinflammation and microglial activation in Alzheimer disease (2021)](https://doi.org/10.1038/s41582-020-00435-y)