TGFB3 Protein

TGFB3 Protein

Introduction

Transforming Growth Factor Beta 3 (TGF-β3) is a member of the TGF-β superfamily of cytokines. Unlike TGF-β1 and TGF-β2, TGF-β3 has unique expression patterns and functions in the developing and adult central nervous system (CNS). It plays critical roles in neuronal development, synaptic plasticity, and neuroprotection[@krieglstein2002]. [@krieglstein2002]

Overview

TGF-β3 is encoded by the TGFB3 gene and secreted as a latent propeptide that requires proteolytic cleavage for activation. It signals through the same receptor complex as TGF-β1 and TGF-β2 (TβRI and TβRII), but has distinct biological effects in the nervous system[@massagu2012]. [@massagu2012]

TGFB3 Protein

Introduction

Transforming Growth Factor Beta 3 (TGF-β3) is a member of the TGF-β superfamily of cytokines. Unlike TGF-β1 and TGF-β2, TGF-β3 has unique expression patterns and functions in the developing and adult central nervous system (CNS). It plays critical roles in neuronal development, synaptic plasticity, and neuroprotection[@krieglstein2002]. [@krieglstein2002]

Overview

TGF-β3 is encoded by the TGFB3 gene and secreted as a latent propeptide that requires proteolytic cleavage for activation. It signals through the same receptor complex as TGF-β1 and TGF-β2 (TβRI and TβRII), but has distinct biological effects in the nervous system[@massagu2012]. [@massagu2012]

<table class="infobox infobox-protein"> [@wysscoray2000]
<tr><th colspan="2" style="background:#f0f0f0;">TGFB3 Protein</th></tr> [@tesseur2006]
<tr><td><b>Protein Name</b></td><td>Transforming Growth Factor Beta 3</td></tr> [@zhu2002]
<tr><td><b>Gene</b></td><td>[TGFB3](/genes/tgfb3)</td></tr>
<tr><td><b>UniProt ID</b></td><td>[P10615](https://www.uniprot.org/uniprot/P10615)</td></tr>
<tr><td><b>PDB ID</b></td><td>[1TGK](https://www.rcsb.org/structure/1TGK)</td></tr>
<tr><td><b>Molecular Weight</b></td><td>44,700 Da</td></tr>
<tr><td><b>Subcellular Location</b></td><td>Extracellular, secreted</td></tr>
<tr><td><b>Protein Family</b></td><td>TGF-beta family</td></tr>
<tr><td><b>Chromosome</b></td><td>14q13</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/migraine" style="color:#ef9a9a">Migraine</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">13 edges</a></td>
</tr>
</table>

Protein Structure

TGF-β3 shares the characteristic TGF-β structure:

• Latent TGF-β binding protein (LTBP) binding site: N-terminal region
• Latency-associated peptide (LAP): Forms inactive complex with mature TGF-β
• Mature TGF-β3: C-terminal disulfide-linked homodimer
• RGD sequence: Integrin recognition motif for activation

Normal Function in the Nervous System

Neuronal Development

Synaptic Plasticity

• [Long-term potentiation](/mechanisms/long-term-potentiation) (LTP) in [hippocampus](/brain-regions/hippocampus)
• Synaptic strength and stability
• GABAergic signaling

Neuroprotection

• Excitotoxicity
• Oxidative stress
• Ischemic injury

Role in Alzheimer's Disease

TGF-β3 has complex, context-dependent roles in AD pathogenesis:

Protective Effects

• Promotes [Aβ](/proteins/amyloid-beta) clearance through upregulated Aβ-degrading enzymes
• Modulates microglial activation toward anti-inflammatory phenotype
• Protects against [tau](/proteins/tau)-induced neurodegeneration

Dysregulation

• TGF-β3 levels are altered in AD brain
• Impaired TGF-β signaling contributes to synaptic dysfunction
• Interactions with [APOE](/proteins/apoe-protein) affect disease progression[@tesseur2006]

Role in Parkinson's Disease

Dopaminergic Neuron Survival

• Upregulates anti-apoptotic proteins (Bcl-2, Bcl-xL)
• Modulates [autophagy](/entities/autophagy)
• Reduces neuroinflammation

Therapeutic Potential

Role in Neuroinflammation

TGF-β3 modulates glial cell function:

Microglial Polarization

• Promotes M2 (anti-inflammatory) phenotype
• Reduces pro-inflammatory cytokine production
• Enhances phagocytic clearance

Astrocyte Function

• Regulates astrocytic reactivity
• Modulates glutamate uptake
• Supports [blood-brain barrier](/entities/blood-brain-barrier) integrity

Signaling Pathways

TGF-β3 signals through canonical and non-canonical pathways:

Canonical SMAD Pathway

Non-Canonical Pathways

• PI3K/AKT
• MAPK/ERK
• Rho GTPases

Therapeutic Targeting

TGF-β3-based therapies for neurodegeneration:

| Approach | Status | Indication |
|----------|--------|------------|
| Recombinant TGF-β3 | Preclinical | PD, stroke |
| TGF-β3 gene therapy | Preclinical | AD |
| SMAD7 overexpression | Preclinical | Neuroinflammation |

Background

The study of Tgfb3 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.

See Also

• TGFB3 Gene
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Neuroinflammation Pathway](/mechanisms/neuroinflammation-pathway)
• TGF-beta Signaling
• [Microglia](/cell-types/microglia)

External Links

• [UniProt](https://www.uniprot.org/uniprot/P10615)
• [PDB](https://www.rcsb.org/structure/1TGK)
• [NCBI Gene](https://www.ncbi.nlm.nih.gov/gene/7048)

References