gp130 Protein - IL-6 Signal Transducer

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

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

• Conserved cytokine-binding domain
• Contains characteristic cysteine pairs
• Recognizes cytokine-binding motifs

• 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

• STAT3 or STAT1 dock to phosphorylated tyrosines
• JAKs phosphorylate STATs
• STATs dimerize and translocate to nucleus

• 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

• [Microglia](/entities/microglia) express GP130
• Cytokine signaling modulates microglial phenotype
• Important for CNS immune responses

• 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

• Acute IL-6 signaling can be neuroprotective
• May activate anti-apoptotic pathways

• 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

• 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

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