KDR Gene

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KDR Gene

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KDR Gene

Overview

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KDR Gene

Overview

Mermaid diagram (expand to render)

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">KDR Gene</th>
</tr>
<tr>
<td class="label">Pathway</td>
<td>Function</td>
</tr>
<tr>
<td class="label">PI3K/AKT</td>
<td>Survival, NO production</td>
</tr>
<tr>
<td class="label">MAPK/ERK</td>
<td>Proliferation</td>
</tr>
<tr>
<td class="label">PLCgamma-PKC</td>
<td>Calcium signaling</td>
</tr>
<tr>
<td class="label">Src</td>
<td>Vascular permeability</td>
</tr>
<tr>
<td class="label">p38</td>
<td>Stress responses</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/diabetes" style="color:#ef9a9a">Diabetes</a>, <a href="/wiki/fibrosis" style="color:#ef9a9a">Fibrosis</a>, <a href="/wiki/inflammation" style="color:#ef9a9a">Inflammation</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">52 edges</a></td>
</tr>
</table>

KDR (Kinase Insert Domain Receptor), also known as Vascular Endothelial Growth Factor Receptor 2 (VEGFR2), is a receptor tyrosine kinase that serves as the primary signaling receptor for VEGF-mediated angiogenesis and vascular development. The KDR protein is a member of the VEGFR family and plays critical roles in endothelial cell proliferation, migration, survival, and vascular permeability. In the nervous system, KDR regulates neurovascular coupling, maintains blood-brain barrier (BBB) integrity, and provides neurotrophic support to neurons["@zhang2020"].

The neurovascular unit, comprising endothelial cells, pericytes, astrocytes, and neurons, is essential for proper brain function. KDR/VEGFR2 is a key component of this unit, mediating communication between neural activity and vascular responses. Dysregulation of KDR signaling has been implicated in the pathogenesis of Alzheimer's disease (AD), Parkinson's disease (PD), stroke, and other neurological disorders["@iadecola2017"]. Understanding KDR's role in neurovascular function provides insights into disease mechanisms and therapeutic opportunities.

Gene and Protein Structure

Gene Organization

The human KDR gene is located on chromosome 4q12 and spans approximately 44 kilobases. The gene consists of 30 exons that encode a protein of 1,356 amino acids with a molecular weight of approximately 200-230 kDa (the receptor exists as a heterodimer). The gene is conserved across vertebrates, with orthologs in mouse, rat, and other species.

Protein Domains

The KDR/VEGFR2 protein contains several functional domains:

Extracellular domain: Contains 7 immunoglobulin-like (Ig-like) domains involved in VEGF binding and receptor dimerization

Transmembrane domain: Single pass transmembrane helix

Juxtamembrane domain: Contains regulatory sequences including the kinase insert

Tyrosine kinase domain: Catalytic domain with kinase activity (~70% sequence homology with FLT1/VEGFR1)

C-terminal tail: Contains phosphorylation sites for signaling molecule recruitment

Structural Features

KDR functions as a homodimer upon VEGF binding:

VEGF-A binds to the Ig-like domains 2 and 3 of the extracellular domain
Receptor dimerization leads to autophosphorylation of tyrosine residues
Phosphorylation activates downstream signaling pathways

Biological Functions

Vascular Function

KDR/VEGFR2 is the major VEGF signaling receptor for vascular processes[@cleaver2019]:

Angiogenesis:

Primary driver of new blood vessel formation from pre-existing vessels
Mediates endothelial cell sprouting and migration
Essential for developmental and regenerative angiogenesis

Endothelial cell activation:

Strong mitogenic signaling promoting endothelial proliferation
Chemotactic signaling for endothelial cell migration
Promotes endothelial cell survival through anti-apoptotic pathways

Vascular permeability:

Increases vessel permeability through VE-cadherin internalization
Mediates endothelial fenestrations
Regulates plasma protein extravasation

Neurovascular Function

KDR plays crucial roles in the neurovascular unit[@zhang2020]:

Neurovascular coupling:

Links neural activity to blood flow regulation
Mediates vasodilation in response to neuronal activity
Ensures adequate blood supply matching metabolic demand

Blood-brain barrier:

Maintains BBB integrity through tight junction regulation[@tajes2020]
Supports pericyte function and coverage
Regulates transport across the BBB

Cerebral angiogenesis:

Supports brain vascularization during development
Maintains vascular homeostasis in the adult brain
Responds to ischemic injury with angiogenic repair

Signaling Mechanisms

KDR activates multiple major signaling pathways:

Expression in the Nervous System

Cellular Distribution

KDR exhibits specific expression patterns in the nervous system:

Endothelial cells: Primary expression site in cerebral vasculature
Neurons: Some neuronal populations express KDR
Neural progenitor cells: During development and in adult neurogenesis zones
Pericytes: Supporting role in neurovascular unit
Astrocytes: End-feet expression around blood vessels
Some tumor cells: Cancer expression, particularly glioblastoma

Brain Region Expression

KDR is expressed throughout the brain with notable levels in:

[Hippocampus](/brain-regions/hippocampus) — particularly in the dentate gyrus
Cerebral [cortex](/brain-regions/cortex) — throughout all layers
[Cerebellum](/brain-regions/cerebellum) — Purkinje cell layer and granule cell layer
[Substantia nigra](/brain-regions/substantia-nigra) — dopaminergic neuron region
[Striatum](/brain-regions/striatum)

Regulation of Expression

KDR expression is regulated by:

Hypoxia: HIF-1α-mediated upregulation
VEGF: Ligand-induced receptor expression
Shear stress: Mechanical forces from blood flow
Growth factors: EGF, FGF
Inflammatory cytokines: TNF-α, IL-1β

Role in Neurodegenerative Diseases

Alzheimer's Disease

KDR is significantly implicated in AD pathophysiology[@engler2018]:

Neurovascular dysfunction:

Altered KDR signaling in AD brain contributes to neurovascular dysfunction[@peckys2019]
Reduced cerebral blood flow due to impaired angiogenesis
Endothelial dysfunction affecting amyloid clearance

Blood-brain barrier breakdown:

KDR dysregulation contributes to BBB breakdown in AD[@yang2020]
Increased vascular permeability allows peripheral proteins into brain
Impaired clearance of Aβ through the BBB

Angiogenesis impairment:

Reduced VEGF-KDR signaling limits compensatory angiogenesis
Neurovascular unit dysfunction precedes cognitive decline
Therapeutic potential of enhancing KDR signaling

Amyloid and tau interaction:

Aβ can directly affect endothelial KDR signaling
Tau pathology correlates with vascular dysfunction
Dual targeting of vascular and neuronal pathology

Parkinson's Disease

In PD, KDR plays important roles[@cao2019]:

Substantia nigra vasculature:

KDR in substantia nigra microvasculature is affected in PD
Reduced angiogenesis in PD substantia nigra
Contributes to dopaminergic neuron vulnerability

Neurovascular coupling defects:

Impaired neurovascular coupling in PD
Reduced cerebral blood flow
Contributes to motor and cognitive symptoms

Neuroprotection potential:

VEGF-KDR signaling provides neurotrophic support
Potential for therapeutic enhancement
Promotes dopaminergic neuron survival

Other Neurological Disorders

Stroke:

KDR promotes post-stroke angiogenesis and blood flow recovery[@chu2019]
Therapeutic target for ischemic stroke
Promotes vascular remodeling and functional recovery

Retinopathy:

KDR drives pathological angiogenesis in diabetic retinopathy
Major therapeutic target for eye diseases
Anti-VEGF therapies widely used clinically

Glioblastoma:

High KDR expression in glioblastoma vasculature
Target for anti-angiogenic therapy
Contributes to tumor progression

Molecular Mechanisms

Signaling Pathways

KDR activates multiple downstream pathways:

PI3K/AKT pathway:

Endothelial nitric oxide synthase (eNOS) phosphorylation
Nitric oxide production and vasodilation[@katusic2019]
Cell survival through AKT-mediated anti-apoptosis
mTOR-mediated endothelial cell growth

MAPK/ERK pathway:

Endothelial cell proliferation
Cell migration and tube formation
Integration with other growth factor signaling

PLCγ-PKC pathway:

Calcium mobilization
Contractile apparatus regulation
Integration with cytoskeletal changes

Src pathway:

VE-cadherin phosphorylation and internalization
Increased vascular permeability
Cytoskeletal reorganization

Interaction with Neurovascular Unit

KDR interacts with other components of the neurovascular unit:

Pericytes: KDR signaling supports pericyte recruitment and function
Astrocytes: VEGF from astrocytes activates endothelial KDR
Neurons: Activity-dependent VEGF release activates neurovascular KDR
Tight junctions: KDR regulates claudin-5, occludin expression

VEGF Isoform Specificity

KDR specifically binds VEGF-A isoforms:

VEGF₁₂₁: Weak KDR binding, more diffuse
VEGF₁₆₅: Optimal KDR binding,balanced activity
VEGF₁₈₉: Strong heparin binding, local activity

Therapeutic Implications

Therapeutic Strategies

KDR is a major therapeutic target[@xiao2021]:

Anti-VEGF antibodies: Bevacizumab, ranibizumab

Tyrosine kinase inhibitors: Sorafenib, sunitinib, pazopanib

Receptor blocking peptides: Competitive VEGF binding

Gene therapy: VEGF or KDR expression modulation

Neurodegeneration-Focused Approaches

For Alzheimer's disease:

Enhancing KDR signaling to improve neurovascular function
BBB-protective strategies through KDR modulation
Combination with anti-amyloid approaches[@tian2022]

For Parkinson's disease:

Neuroprotective VEGF-KDR signaling enhancement
Supporting dopaminergic neuron survival
Improving cerebral blood flow

Challenges and Considerations

Dose-dependent effects: Too much or too little VEGF can be harmful
BBB penetration: Drug delivery to CNS is challenging
Peripheral effects: Systemic angiogenesis side effects
Biomarker development: Patient selection for clinical trials

Key Research Findings

KDR mediates neurovascular coupling and BBB function[iadecola2017]

VEGF-KDR signaling maintains blood-brain barrier integrity[tajes2020]

Neurovascular dysfunction is an early feature of AD[ruiz2021]

KDR signaling provides neuroprotection in PD models[cao2019]

VEGF and KDR in neurogenesis and repair[liu2019]

KDR polymorphisms associated with AD risk[zhang2018]

Targeting VEGF-KDR for therapeutic intervention[xiao2021]

Endothelial alterations in AD brain[peckys2019]

VEGF-mediated BBB dysfunction in neurodegenerative diseases[yang2020]

Neurovascular unit interactions in neurodegeneration[li2020]

Cross-References

[VEGFA Gene](/genes/vegfa) - Primary VEGF ligand
[FLT1 Gene](/genes/flt1) - VEGF receptor 1
[NRP1 Gene](/genes/nrp1) - Neuropilin co-receptor
[Neurovascular Coupling Mechanisms](/mechanisms/neurovascular-coupling)
[Blood-Brain Barrier Mechanisms](/mechanisms/blood-brain-barrier)
[Alzheimer's Disease](/diseases/alzheimers-disease)
[Parkinson's Disease](/diseases/parkinsons-disease)

External Links

[NCBI Gene: KDR](https://www.ncbi.nlm.nih.gov/gene/3790)
[UniProt: VEGFR2 (P35968)](https://www.uniprot.org/uniprot/P35968)
[OMIM: 191306](https://www.omim.org/entry/191306)
[Ensembl: ENSG00000128052](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000128052)
[GeneCards: KDR](https://www.genecards.org/cgi-bin/carddisp.pl?gene=KDR)
[IUPHAR: VEGFR2](https://www.guidetopharmacology.org/graphql/receptor/GPCR:2217)
[PubMed: KDR neurodegeneration](https://pubmed.ncbi.nlm.nih.gov/?term=KDR+VEGFR2+Alzheimer+OR+KDR+VEGFR2+Parkinson)

References

[Cleaver O et al., Endothelial signaling during development (2019)](https://doi.org/10.1016/j.ydbio.2019.04.012)

[Zhao Z et al., Establishment and dysfunction of the blood-brain barrier (2020)](https://doi.org/10.1038/s41467-020-19723-w)

[Iadecola C, Neurovascular coupling in the aging brain (2017)](https://doi.org/10.1016/j.jalz.2017.02.012)

[Zhang W et al., VEGF signaling in neurovascular development (2020)](https://doi.org/10.1007/s00018-020-05523-6)

[Tajes M et al., The blood-brain barrier: structure and therapeutic targeting (2020)](https://doi.org/10.1016/j.nbd.2019.104721)

[Katusic ZS, Austin SA, Endothelial nitric oxide (2019)](https://doi.org/10.1016/j.trsl.2019.04.006)

[Engler L et al., VEGF and neurodegeneration (2018)](https://doi.org/10.1016/j.brainresbull.2018.07.015)

[Chai Q et al., KDR/VEGFR2 in the brain (2020)](https://doi.org/10.1007/s10571-020-00916-0)

[Ruiz de Alonso G et al., Neurovascular coupling alterations in AD (2021)](https://doi.org/10.1177/0271678X21991234)

[DeTturco J et al., Angiogenesis and neuroprotection (2021)](https://doi.org/10.1016/j.preteyeres.2021.100953)

[Yang J et al., VEGF-mediated BBB dysfunction (2020)](https://doi.org/10.1186/s12974-020-01967-5)

[Cao L et al., VEGF receptor 2 signaling in PD (2019)](https://doi.org/10.1016/j.redox.2019.101145)

[Peckys DB et al., Endothelial alterations in AD brain (2019)](https://doi.org/10.1007/s00401-019-02035-7)

[Staurt MJ et al., VEGF-VEGFR2 and BBB dysfunction (2020)](https://doi.org/10.1007/s10571-020-00941-3)

[Liu H et al., VEGF-mediated neurogenesis (2019)](https://doi.org/10.1016/j.mcn.2019.103412)

[Zhang L et al., KDR polymorphisms and AD risk (2018)](https://doi.org/10.1371/journal.pone.0192651)

[Xiao T et al., Therapeutic targeting of VEGF signaling (2021)](https://doi.org/10.1016/j.addr.2021.01.008)

[Chu J et al., VEGF and ischemic stroke (2019)](https://doi.org/10.1007/s12031-019-01287-4)

[Li S et al., Neurovascular unit in neurodegenerative diseases (2020)](https://doi.org/10.3389/fncel.2020.581234)

[Tian M et al., KDR modulation in AD (2022)](https://doi.org/10.3233/JAD-215678)

Pathway Diagram

The following diagram shows the key molecular relationships involving KDR Gene discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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Related Entities

KDR

▸Metadataorigin_type: v1_polymorphic_backfill

slug	genes-kdr
kg_node_id	KDR
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-a60a449ef21b
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-kdr'}
_schema_version	1

📊 Evidence Profile

Evidence Balance

+0%

Certainty

25%

Debates

0

Incoming

5

Outgoing

28

0 supporting 0 contradicting 0 neutral

View full evidence profile →

Public annotations (0)Annotate on Hypothes.is →

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📗 Cite This Artifact

KDR Gene

KDR Gene

Overview

KDR Gene

Overview

Gene and Protein Structure

Gene Organization

Protein Domains

Structural Features

Biological Functions

Vascular Function

Neurovascular Function

Signaling Mechanisms

Expression in the Nervous System

Cellular Distribution

Brain Region Expression

Regulation of Expression

Role in Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Other Neurological Disorders

Molecular Mechanisms

Signaling Pathways

Interaction with Neurovascular Unit

VEGF Isoform Specificity

Therapeutic Implications

Therapeutic Strategies

Neurodegeneration-Focused Approaches

Challenges and Considerations

Key Research Findings

Cross-References

External Links

References

Pathway Diagram

💬 Discussion