gp130 Protein - IL-6 Signal Transducer
Introduction
<table class="infobox infobox-protein">
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<th class="infobox-header" colspan="2">gp130 Protein - IL-6 Signal Transducer</th>
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<td class="label">Symbol</td>
<td><strong>GP130</strong></td>
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<td class="label">Full Name</td>
<td>gp130 - IL-6 Signal Transducer</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=GP130" target="_blank">Search UniProt</a></td>
</tr>
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<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">4 edges</a></td>
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GP130 (Glycoprotein 130, also known as IL6ST or IL-6 Signal Transducer) is a common signal-transducing receptor subunit used by multiple interleukin-6 family cytokines. As a key component of the IL-6 family cytokine receptor complex, GP130 is essential for signaling through JAK/STAT, MAPK, and PI3K/Akt pathways. Given its central role in cytokine signaling, GP130 has been implicated in neuroinflammation, neuronal survival, and neurodegenerative diseases including Alzheimer's disease, Parkinson's disease, and multiple sclerosis.
title: gp130 Protein
...gp130 Protein - IL-6 Signal Transducer
Introduction
<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">gp130 Protein - IL-6 Signal Transducer</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>GP130</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>gp130 - IL-6 Signal Transducer</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Protein</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/?query=GP130" target="_blank">Search UniProt</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">4 edges</a></td>
</tr>
</table>
GP130 (Glycoprotein 130, also known as IL6ST or IL-6 Signal Transducer) is a common signal-transducing receptor subunit used by multiple interleukin-6 family cytokines. As a key component of the IL-6 family cytokine receptor complex, GP130 is essential for signaling through JAK/STAT, MAPK, and PI3K/Akt pathways. Given its central role in cytokine signaling, GP130 has been implicated in neuroinflammation, neuronal survival, and neurodegenerative diseases including Alzheimer's disease, Parkinson's disease, and multiple sclerosis.
title: gp130 Protein
.infobox.infix-protein
; Protein Name
: Glycoprotein 130 (GP130)
; Gene Symbol
: [IL6ST](/proteins/il6st-protein)
; UniProt ID
: [P40189](https://www.uniprot.org/uniprotkb/P40189)
; Molecular Weight
: ~130 kDa (917 amino acids)
; Subcellular Localization
: Cell membrane, cytoplasm (after ligand binding)
; Protein Family
: IL-6 receptor family (gp130 family)
; Tissue Distribution
: Ubiquitous, high expression in liver, immune cells, brain
Overview
GP130 (encoded by IL6ST gene) is a 917-amino acid transmembrane protein that serves as the common signal-transducing receptor subunit for the interleukin-6 (IL-6) family of cytokines[@heinrich2003]. This family includes IL-6, IL-11, leukemia inhibitory factor (LIF), oncostatin M (OSM), ciliary neurotrophic factor (CNTF), cardiotrophin-1 (CT-1), and IL-27.
Key Features
- Common receptor subunit: Shared by 10+ cytokine receptors
- Signal transducer: Essential for downstream signaling
- Expression pattern: Ubiquitous with high expression in brain
- Isoforms: Multiple splice variants exist
Structure
Extracellular Domain (1-597 aa)
The extracellular region contains:
Immunoglobulin-like Domain (1-100 aa):
- Ig-like fold for protein interactions
- Contributes to ligand binding
Cytokine-binding homology region (CHR):
- Conserved cytokine-binding domain
- Contains characteristic cysteine pairs
- Recognizes cytokine-binding motifs
Fibronectin type III domains:
- Three FNIII repeats
- Provide structural support
- Contain transmembrane junction
Transmembrane Domain (598-622 aa)
- Single alpha-helical transmembrane segment
- Anchors receptor in plasma membrane
Intracellular Domain (623-917 aa)
Contains critical signaling motifs:
Box1 motif: JAK binding site
Box2 motif: Additional JAK interaction
Multiple tyrosine residues: STAT docking sites
Signaling Mechanisms
JAK/STAT Pathway
GP130 activates JAK tyrosine kinases[@oshea2015]:
JAK Activation:
- JAK1, JAK2, or TYK2 bind to Box1/Box2 motifs
- Ligand binding induces receptor dimerization
- JAKs transphosphorylate each other
STAT Phosphorylation:
- STAT3 or STAT1 dock to phosphorylated tyrosines
- JAKs phosphorylate STATs
- STATs dimerize and translocate to nucleus
Gene Transcription:
- STAT dimers act as transcription factors
- Induce acute phase response genes
- Anti-apoptotic gene expression
MAPK Pathway
GP130 also activates MAPK signaling:
- SHP2/Grb2/SOS recruitment
- Ras/Raf/MEK/ERK cascade
- Cell proliferation and differentiation
PI3K/Akt Pathway
- PI3K recruited to membrane
- PIP3 generation
- Akt activation
- Pro-survival signaling
Function in the Nervous System
Neuroinflammation
GP130 is central to neuroinflammatory responses[@erta2012]:
Astrocyte Activation:
- IL-6 signaling via GP130 activates [astrocytes](/entities/astrocytes)
- Leads to production of inflammatory mediators
- Contributes to neuroinflammation
Microglial Activation:
- [Microglia](/entities/microglia) express GP130
- Cytokine signaling modulates microglial phenotype
- Important for CNS immune responses
[Blood-Brain Barrier](/entities/blood-brain-barrier):
- GP130 signaling affects BBB integrity
- Regulates leukocyte recruitment
Neuronal Function
In [neurons](/entities/neurons), GP130 signaling:
- Regulates neuronal survival
- Modulates synaptic plasticity
- Affects neurogenesis
Oligodendrocyte Function
GP130 is important for oligodendrocytes:
- Supports oligodendrocyte progenitor survival
- Myelin maintenance
- Demyelination repair
Role in Neurodegenerative Diseases
Alzheimer's Disease
GP130 has complex roles in AD[@ringheim1995]:
Neuroinflammation:
- Chronic IL-6/GP130 signaling contributes to neuroinflammation
- May exacerbate AD pathology
Neuroprotective Effects:
- Acute IL-6 signaling can be neuroprotective
- May activate anti-apoptotic pathways
Therapeutic Targeting:
- GP130 modulators being investigated
- Balancing pro- and anti-inflammatory effects
Parkinson's Disease
In PD, GP130 signaling may[@bolin2002]:
- Modulate dopaminergic neuron survival
- Influence neuroinflammation
- Affect protein aggregation
Multiple Sclerosis
GP130 is relevant to MS:
- Demyelination involves cytokine signaling
- Remyelination may require GP130 signaling
- Therapeutic targeting explored
Amyotrophic Lateral SALS
In ALS:
- Motor neuron GP130 expression
- Neuroinflammation modulation
- Potential therapeutic target
Clinical Significance
Therapeutic Targeting
GP130 is a drug target:
Inhibitors:
- Siltuximab: Anti-IL-6 monoclonal antibody
- Tocilizumab: IL-6R blocking antibody
- Being explored for neuroinflammation
Agonists:
- IL-6 trans-signaling agonists
- Neuroprotective approaches
Biomarker Potential
GP130 levels may indicate:
- Inflammatory status
- Disease progression
- Treatment response
Genetics
IL6ST Polymorphisms
Genetic variants may affect:
- Cytokine signaling efficiency
- Disease susceptibility
- Treatment response
Research Directions
Unresolved Questions
How does GP130 balance neuroprotective vs. neurotoxic effects?
Can GP130 modulation benefit neurodegenerative patients?
What determines cell-type specific responses?Experimental Approaches
- Transgenic mouse models
- Patient-derived cells
- Small molecule screening
See Also
- [IL6ST Gene](/proteins/il6st-protein)
- [Interleukin-6](/proteins/interleukin-6)
- [Neuroinflammation](/mechanisms/neuroinflammation)
- [JAK-STAT Signaling](/mechanisms/jak-stat-signaling-neurodegeneration))
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Parkinson's Disease](/diseases/parkinsons-disease)
- [Multiple Sclerosis](/diseases/multiple-sclerosis)
External Links
- [GP130 Protein - UniProt P40189](https://www.uniprot.org/uniprotkb/P40189)
- [NCBI Gene: IL6ST](https://www.ncbi.nlm.nih.gov/gene/3569)
- [IL-6 Family Cytokines - IUPHAR](https://www.guidetopharmacology.org/GRAC/FamilyDisplayForward?familyId=555)
Background
The study of Gp130 Protein Il 6 Signal Transducer 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
[Kishimoto T, et al., (1995). IL-6 family of cytokines and GP130. Blood (1995)](https://pubmed.ncbi.nlm.nih.gov/7540141/)
[Scheller J, et al., (2011). The IL-6 family of cytokines. Cold Spring Harb Perspect Biol (2011)](https://pubmed.ncbi.nlm.nih.gov/21934100/)
[Heinrich PC, et al., (2003). Principles of interleukin-6-type cytokine signalling. Biochem J (2003)](https://pubmed.ncbi.nlm.nih.gov/12689679/)
[O'Shea JJ, et al., (2015). JAK/STAT pathways. N Engl J Med (2015)](https://pubmed.ncbi.nlm.nih.gov/26606758/)
[Erta M, et al., (2012). IL-6 in the nervous system. Int J Biol Sci (2012)](https://pubmed.ncbi.nlm.nih.gov/22298955/)
[Ringheim GE, et al., (1995). Interleukin-6 and Alzheimer's disease. Neuroscience (1995)](https://pubmed.ncbi.nlm.nih.gov/8786794/)
[Bolin LM, et al., (2002). Neurotrophic effects of IL-6. Exp Neurol (2002)](https://pubmed.ncbi.nlm.nih.gov/11958850/)