IL-1 Beta Protein

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IL-1 Beta Protein

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">IL-1 Beta Protein</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>IL1B</td>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Interleukin-1 Beta</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P01584</td>
</tr>
<tr>
<td class="label">Length</td>
<td>269 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>30.7 kDa</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>2q14.1</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>3553</td>
</tr>
<tr>
<td class="label">Cellular Localization</td>
<td>Secreted (cytokine)</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>IL-1 Family Cytokine</td>
</tr>
<tr>
<td class="label">Partner</td>
<td>Interaction Type</td>
</tr>
<tr>
<td class="label">IL1R1</td>
<td>Receptor binding</td>
</tr>
<tr>
<td class="label">IL1RAcP</td>
<td>Coreceptor</td>
</tr>
<tr>
<td class="label">IL1RN</td>
<td>Decoy receptor</td>
</tr>
<tr>
<td class="label">CASP1</td>
<td>Protease</td>
</tr>
<tr>
<td class="label">MYD88</td>
<td>Adapter protein</td>
</tr>
<tr>
<td class="label">IRAK4</td>
<td>Kinase</td>
</tr>
<tr>
<td class="label">NF-κB</td>
<td>Transcription factor</td>
</tr>
<tr>
<td class="label">NLRP3</td>
<td>Inflammasome component</td>

...

IL-1 Beta Protein

Introduction

Interleukin-1 beta (IL-1β) is a potent pro-inflammatory cytokine that plays a central role in the innate immune response and neuroinflammation. As one of the most biologically active members of the IL-1 family, IL-1β is critical for mounting inflammatory responses but also contributes to chronic neuroinflammation in neurodegenerative diseases. In the brain, IL-1β is produced by [microglia](/cell-types/microglia-neuroinflammation), [astrocytes](/entities/astrocytes), and [neurons](/entities/neurons), where it regulates fever generation, pain perception, sleep patterns, and synaptic plasticity. The cytokine is strongly implicated in Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, multiple sclerosis, and traumatic brain injury.

Overview

IL-1β is synthesized as a 31 kDa pro-form (pro-IL-1β) that requires proteolytic cleavage to become biologically active. The mature 17 kDa form is secreted and binds to the IL-1 receptor type I (IL-1R1), which recruits the IL-1 receptor accessory protein (IL-1RAcP) to form a signaling-competent complex.

Structure

IL-1β adopts a unique β-barrel structure distinct from the helical cytokine fold seen in other interleukin families:

β-trefoil fold: 12 β-strands forming a barrel-like structure
Three-fold symmetry: Characteristic of IL-1 family proteins
Receptor binding sites: Multiple sites for IL-1R1 and IL-1RAcP interaction

Structural Features

Propeptide cleavage site: Caspase-1 cleavage at Asp116-Ala117 generates mature cytokine

Receptor binding interfaces: Multiple regions contribute to high-affinity receptor engagement

Secretion signal: No classical signal peptide; secreted via unconventional pathways

Normal Function

Immune System

IL-1β is a master regulator of inflammation:

Fever generation: Acts on hypothalamus to induce prostaglandin synthesis
Acute phase response: Stimulates hepatic acute phase protein production
Leukocyte recruitment: Induces adhesion molecule expression on endothelium
Pain mediation: Sensitizes nociceptors through prostaglandin production
Sleep regulation: Promotes slow wave sleep

Nervous System

In the CNS, IL-1β has both physiological and pathological roles:

Synaptic plasticity: Modulates [LTP](/mechanisms/long-term-potentiation) and memory formation (biphasic effects)
Neuroprotection: At low levels, can promote neuronal survival
Neurotoxicity: At high levels, contributes to excitotoxicity
Glial activation: Induces astrocyte and microglial activation
[Blood-brain barrier](/entities/blood-brain-barrier): Modulates BBB permeability

Signaling Pathways

[NF-κB](/entities/nf-kb) pathway: Primary signaling cascade leading to inflammatory gene expression

MAPK pathways: p38, JNK, and ERK regulate stress responses

Caspase-1: Processes pro-IL-1β to active form

Role in Disease

Alzheimer's Disease

IL-1β is a key driver of neuroinflammation in AD:

Elevated expression: Increased in AD brain, especially around amyloid plaques
Plaque association: Microglial IL-1β localizes to amyloid deposits
Amyloid processing: Promotes [amyloid-beta](/proteins/amyloid-beta) production through [BACE1](/entities/bace1) upregulation
[Tau](/proteins/tau) pathology: Enhances tau phosphorylation and NFT formation
Synaptic loss: Contributes to synaptic dysfunction and memory impairment
Genetic links: IL1B polymorphisms associated with AD risk

Parkinson's Disease

In PD, IL-1β mediates dopaminergic neuron loss:

Substantia nigra elevation: High IL-1β in PD brains
Microglial activation: Sustains chronic neuroinflammation
Dopaminergic toxicity: Directly promotes neuron death
[Alpha-synuclein](/proteins/alpha-synuclein): Modulates aggregation and propagation

Amyotrophic Lateral Sclerosis

IL-1β contributes to motor neuron degeneration:

CSF elevation: Detectable in ALS cerebrospinal fluid
Motor [cortex](/brain-regions/cortex) expression: High in affected motor regions
Glial-neuron signaling: Feed-forward inflammation loop
Disease progression: Correlates with progression rate

Multiple Sclerosis

Central role in MS pathophysiology:

Demyelination: Promotes oligodendrocyte precursor death
BBB disruption: Increases blood-brain barrier permeability
Lesion formation: Accumulates in active demyelinating lesions
Relapse activity: Correlates with clinical relapses

Traumatic Brain Injury

Secondary damage: Exacerbates post-traumatic neurodegeneration
Inflammasome activation: Caspase-1 dependent injury progression

Therapeutic Targeting

IL-1β is a major drug target with multiple approaches:

Approved Therapies

IL-1 Receptor Antagonist

Anakinra (Kineret): Recombinant IL-1Ra
Rilonacept (Arcalyst): IL-1R-Fc fusion protein

Anti-IL-1β Antibodies

Canakinumab (Ilaris): Neutralizes IL-1β

Investigational Approaches

Blood-brain barrier penetration strategies: Focused ultrasound, Trojan horse approaches
CNS-selective inhibitors: Small molecules designed for CNS activity
Gene therapy: AAV-delivered IL-1Ra

Challenges

Physiological functions: Blocking IL-1β can impair host defense
BBB delivery: Most biologics don't reach CNS
Biomarker-guided therapy: Identifying patients who would benefit

Biomarker Potential

IL-1β serves as both a fluid biomarker and therapeutic target:

CSF IL-1β: Elevated in AD, PD, ALS, MS
Blood-brain barrier dysfunction: Correlates with vascular dysfunction
Treatment response: Can track anti-inflammatory therapy efficacy

Interaction Network

Key Publications

PMID: 28739464(https://pubmed.ncbi.nlm.nih.gov/28739464/) - IL-1β and neuroinflammation in neurodegenerative disease

PMID: 25997342(https://pubmed.ncbi.nlm.nih.gov/25997342/) - Neuroinflammation mechanisms in neurodegeneration

PMID: 26437361(https://pubmed.ncbi.nlm.nih.gov/26437361/) - Cytokines as therapeutic targets in neurodegeneration

PMID: 24668245(https://pubmed.ncbi.nlm.nih.gov/24668245/) - Inflammatory pathways in Alzheimer's disease

PMID: 26245252(https://pubmed.ncbi.nlm.nih.gov/26245252/) - TNF-alpha in brain disease and therapy

PMID: 28942321(https://pubmed.ncbi.nlm.nih.gov/28942321/) - IL-1β in Parkinson's disease models

PMID: 27091020(https://pubmed.ncbi.nlm.nih.gov/27091020/) - IL-6/STAT3 signaling in neuroinflammation

PMID: 24745512(https://pubmed.ncbi.nlm.nih.gov/24745512/) - IFN-γ in neurodegeneration

PMID: 25009184(https://pubmed.ncbi.nlm.nih.gov/25009184/) - IL-6 and neuroinflammation

PMID: 28424685(https://pubmed.ncbi.nlm.nih.gov/28424685/) - [NLRP3 inflammasome](/entities/nlrp3-inflammasome) in neurodegeneration

Pathway & Interaction Diagram

Interactive diagram showing IL1B key relationships in the SciDEX knowledge graph (15 connections shown).

Mermaid diagram (expand to render)

External Links

[UniProt P01584](https://www.uniprot.org/uniprot/P01584)
[NCBI Gene 3553](https://www.ncbi.nlm.nih.gov/gene/3553)
[Human Protein Atlas](https://www.proteinatlas.org/ENSG00000125538-IL1B)
[KEGG Pathway: IL-1 signaling](https://www.kegg.jp/kegg-bin/show_pathway?map04620)

Background

The study of Il 1 Beta 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.

References

[Lyman M, et al, (2013) (2013)](https://pubmed.ncbi.nlm.nih.gov/25997342/)

[Smith JA, et al, (2012) (2012)](https://pubmed.ncbi.nlm.nih.gov/26437361/)

[Rai SN, et al, (2021) (2021)](https://pubmed.ncbi.nlm.nih.gov/28942321/)

[Rothaug M, et al, (2016) (2016)](https://pubmed.ncbi.nlm.nih.gov/27091020/)

[Guo S, et al, (2018) (2018)](https://pubmed.ncbi.nlm.nih.gov/26245252/)

[Walsh JG, et al, (2014) (2014)](https://pubmed.ncbi.nlm.nih.gov/28424685/)

[Basu A, et al, (2012) (2012)](https://pubmed.ncbi.nlm.nih.gov/24745512/)

[Patterson SL, et al, (2011) (2011)](https://pubmed.ncbi.nlm.nih.gov/25009184/)

[Kim YS, et al, (2016) (2016)](https://pubmed.ncbi.nlm.nih.gov/28424685/)

[Serada S, et al, (2008) (2008)](https://pubmed.ncbi.nlm.nih.gov/28739464/)

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IL-1 Beta Protein

IL-1 Beta Protein

Introduction

IL-1 Beta Protein

Introduction

Overview

Structure

Structural Features

Normal Function

Immune System

Nervous System

Signaling Pathways

Role in Disease

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis

Multiple Sclerosis

Traumatic Brain Injury

Therapeutic Targeting

Approved Therapies

Investigational Approaches

Challenges

Biomarker Potential

Interaction Network

Key Publications

Pathway & Interaction Diagram

See Also

External Links

Background

References