NEFH Protein

NEFH Protein

title: NEFH Protein
<div class="infobox infobox-protein"> [@xu2013]
<table> [@perrot2008]
<tr><th>Protein Name</th><td>Neurofilament Heavy Chain (NF-H)</td></tr> [@nixon1993]
<tr><th>Gene</th><td>[NEFH](/genes/NEFH)</td></tr> [@lee2018]
<tr><th>UniProt ID</th><td>[P12036](https://www.uniprot.org/uniprot/P12036)</td></tr> [@lu2017]
<tr><th>PDB Structure</th><td>1G3C, 2N3P</td></tr>
<tr><th>Molecular Weight</th><td>200 kDa (1,026 amino acids)</td></tr>
<tr><th>Subcellular Localization</th><td>Axons, neuronal cytoskeleton</td></tr>
<tr><th>Protein Family</th><td>Intermediate filament family</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/alzheimer's-disease" style="color:#ef9a9a">ALZHEIMER'S DISEASE</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/inflammation" style="color:#ef9a9a">Inflammation</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">38 edges</a></td>
</tr>
</table>
</div>

NEFH Protein (Neurofilament Heavy Chain)

Overview

Nefh Protein plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.

Introduction

...

NEFH Protein

title: NEFH Protein
<div class="infobox infobox-protein"> [@xu2013]
<table> [@perrot2008]
<tr><th>Protein Name</th><td>Neurofilament Heavy Chain (NF-H)</td></tr> [@nixon1993]
<tr><th>Gene</th><td>[NEFH](/genes/NEFH)</td></tr> [@lee2018]
<tr><th>UniProt ID</th><td>[P12036](https://www.uniprot.org/uniprot/P12036)</td></tr> [@lu2017]
<tr><th>PDB Structure</th><td>1G3C, 2N3P</td></tr>
<tr><th>Molecular Weight</th><td>200 kDa (1,026 amino acids)</td></tr>
<tr><th>Subcellular Localization</th><td>Axons, neuronal cytoskeleton</td></tr>
<tr><th>Protein Family</th><td>Intermediate filament family</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/alzheimer's-disease" style="color:#ef9a9a">ALZHEIMER'S DISEASE</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/inflammation" style="color:#ef9a9a">Inflammation</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">38 edges</a></td>
</tr>
</table>
</div>

NEFH Protein (Neurofilament Heavy Chain)

Overview

Nefh Protein plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.

Introduction

Neurofilament Heavy Chain (NEFH) is the heaviest subunit of the neurofilament intermediate filament family, which also includes NEFL (light) and NEFM (medium) subunits. Neurofilaments are essential structural proteins that maintain axonal caliber, facilitate rapid axonal transport, and provide structural stability to large myelinated axons. NEFH is particularly important in large-diameter motor and sensory [neurons](/entities/neurons), where it constitutes up to 50% of the total neurofilament protein content.

Structure

NEFH is the heaviest neurofilament subunit with unique structural features:

• Alpha-helical rod domain (aa 150-420): Central coiled-coil region that mediates dimerization and filament assembly
• Lysine-serine-proline (KSP) repeats: Over 50 potential phosphorylation sites in the tail domain
• C-terminal tail domain: Long projections (~450 aa) with multiple phosphorylation sites creating side-arm projections

Phosphorylation

The KSP repeat domain is heavily phosphorylated:

• Phosphorylation occurs primarily on serine residues within KSP motifs
• Creates negative charges that regulate interfilament spacing
• Controls binding to microtubule-based motors
• Hyperphosphorylation is a pathological feature in some diseases

Normal Function

Structural Role

• Axonal scaffold: Provides structural integrity to large myelinated axons
• Caliber determinant: Regulates axonal diameter through phosphorylation state
• Transport modulator: Phosphorylation controls binding to kinesin/dynein motors
• Myelination coordinator: Coordinates with myelinating oligodendrocytes and Schwann cells

Phosphorylation-Dependent Regulation

| Phosphorylation State | Effect |
|---------------------|--------|
| Unphosphorylated | Axonal transport, assembly |
| Phosphorylated | Increased caliber, reduced transport |

Role in Disease

Amyotrophic Lateral Sclerosis (ALS)

NEFH is critically involved in ALS pathogenesis:

• Disrupted filament assembly: Mutations in NEFH impair proper neurofilament assembly
• Impaired axonal transport: Defective transport leads to axonal dysfunction
• Aggregation in inclusion bodies: NEFH-positive aggregates found in motor neurons
• Biomarker: NEFH fragments in CSF and blood correlate with disease progression

Charcot-Marie-Tooth Disease (CMT2)

NEFH mutations cause:

• Distal axon degeneration
• Reduced nerve conduction velocity
• Secondary demyelination
• Axonal loss in peripheral nerves

Alzheimer's Disease

• NEFH accumulates in neurofibrillary tangles
• Cross-linking with [tau](/proteins/tau) protein
• Axonal transport deficits

Parkinson's Disease

• Reduced NEFH expression in dopaminergic neurons
• Axonal pathology in substantia nigra

Biomarker Applications

NEFH and its fragments serve as important biomarkers:

| Application | Fluid | Significance |
|------------|-------|--------------|
| ALS diagnosis | CSF | Elevated NEFH |
| Disease progression | Blood/CSF | Correlates with progression rate |
| Treatment response | CSF/Blood | NEFH change predicts outcome |
| CMT assessment | Serum | Axonal loss indicator |

Clinical Utility

• Diagnostic specificity: High in ALS vs. mimics
• Prognostic value: Higher levels = faster progression
• Therapeutic monitoring: Treatment response reflected in levels

Expression Patterns

Brain Regions

• Motor [cortex](/brain-regions/cortex): High expression in pyramidal neurons
• Spinal cord: Abundant in anterior horn cells
• Peripheral nerves: Large-diameter sensory and motor neurons

Development

• Expression increases postnatally
• Correlates with myelination
• Maintained throughout adult life

Animal Models

Transgenic Mice

• NEFH overexpression: Motor neuron degeneration
• NEFH knockout: Reduced axonal caliber
• Phosphorylation mutants: Transport defects

Therapeutic Implications

Drug Targets

• Phosphorylation modulators: Affect neurofilament transport
• Aggregation inhibitors: Prevent toxic aggregation
• Axonal transport enhancers: Restore function

Clinical Trials

• Neurofilament levels as outcome measures
• Monitoring treatment response

Key Publications

[Lee MK, et al. (1995). The neurofilament heavy subunit is required for neurofilament assembly. J Cell Biol.](https://doi.org/10.1083/jcb.130.6.1383)

[Julien JP, et al. (1999). Neurofilament functions in health and disease. Biochim Biophys Acta.](https://doi.org/10.1016/S0304-4165(98)00137-4)

[Friedreich A, et al. (2015). Neurofilament light chain and heavy chain as biomarkers in ALS. Ann Neurol.](https://doi.org/10.1002/ana.24431)

[Xu Z, et al. (2013). Phosphorylation of neurofilament heavy chain regulates axonal transport. J Neurochem.](https://doi.org/10.1111/jnc.12376)

[Perrot R, et al. (2008). Neurofilaments in health and disease. Prog Neurobiol.](https://doi.org/10.1016/j.pneurobio.2008.09.002)

See Also

• [NEFH Gene](/genes/NEFH)
• [NEFL Gene](/genes/NEFL)
• [NEFM Protein](/proteins/nefm-protein)
• [Neurofilaments](/mechanisms/neurofilaments)
• [Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)
• [Charcot-Marie-Tooth Disease](/diseases/charcot-marie-tooth-disease)
• [Axonal Transport](/mechanisms/axonal-transport)

External Links

• [UniProt P12036](https://www.uniprot.org/uniprot/P12036)
• [RCSB PDB 1G3C](https://www.rcsb.org/structure/1G3C)
• [NCBI Gene NEFH](https://www.ncbi.nlm.nih.gov/gene/4744)
• [Allen Brain Atlas](https://human.brain-map.org/microarray/search/show?search_term=NEFH)

Overview

Nefh Protein plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.

Background

The study of Nefh 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

[Lee MK, et al, (1995) (1995)](https://pubmed.ncbi.nlm.nih.gov/7615644/)

[Julien JP, et al, (1999) (1999)](https://pubmed.ncbi.nlm.nih.gov/9920427/)

[Friedreich A, et al, (2015) (2015)](https://pubmed.ncbi.nlm.nih.gov/25940586/)

[Xu Z, et al, (2013) (2013)](https://pubmed.ncbi.nlm.nih.gov/24028532/)

[Perrot R, et al, (2008) (2008)](https://pubmed.ncbi.nlm.nih.gov/18804014/)

[Nixon RA, et al, (1993) (1993)](https://pubmed.ncbi.nlm.nih.gov/8385673/)

[Lee JC, et al, (2018) (2018)](https://pubmed.ncbi.nlm.nih.gov/29643113/)

[Lu CH, et al, (2017) (2017)](https://pubmed.ncbi.nlm.nih.gov/28663219/)