ANXA2 — Annexin A2

ANXA2 — Annexin A2

Introduction

Anxa2 — Annexin A2 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox infobox-gene">
<span class="infobox-title">ANXA2 Gene</span>
| Property | Value |
|----------|-------|
| Gene Symbol | ANXA2 |
| Full Name | Annexin A2 |
| Chromosomal Location | 15q22.2 |
| NCBI Gene ID | 303 |
| OMIM ID | 151680 |
| Ensembl ID | ENSG00000146232 |
| UniProt ID | P07355 |
| Associated Diseases | Alzheimer's Disease, Parkinson's Disease, Cancer, Cardiovascular Disease |
| Protein Class | Annexin Family |
| Molecular Weight | ~36 kDa |
</div>

Pathway Diagram

ANXA2 — Annexin A2

Introduction

Anxa2 — Annexin A2 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox infobox-gene">
<span class="infobox-title">ANXA2 Gene</span>
| Property | Value |
|----------|-------|
| Gene Symbol | ANXA2 |
| Full Name | Annexin A2 |
| Chromosomal Location | 15q22.2 |
| NCBI Gene ID | 303 |
| OMIM ID | 151680 |
| Ensembl ID | ENSG00000146232 |
| UniProt ID | P07355 |
| Associated Diseases | Alzheimer's Disease, Parkinson's Disease, Cancer, Cardiovascular Disease |
| Protein Class | Annexin Family |
| Molecular Weight | ~36 kDa |
</div>

Pathway Diagram

Overview

ANXA2 (Annexin A2) is a calcium-dependent phospholipid-binding protein that functions as both a membrane-associated protein and a secreted form with extracellular functions. Originally identified as a substrate for several protein kinases, ANXA2 plays critical roles in membrane trafficking, cytoskeletal organization, cell adhesion, and fibrinolysis. In the nervous system, ANXA2 is involved in neuroplasticity, neurotransmitter release, and has been implicated in neurodegenerative diseases.

Gene Structure

The ANXA2 gene is located on chromosome 15q22.2 and consists of 14 exons encoding a protein of 338 amino acids. The gene produces multiple splice variants with tissue-specific expression patterns.

Normal Function

ANXA2 performs essential cellular functions:

Membrane Dynamics

• Endocytosis and exocytosis regulation
• Endosomal trafficking
• Membrane organization
• Lipid raft function

Cytoskeletal Interactions

• Actin cross-linking
• Cytoskeletal stability
• Cell adhesion
• Cell migration

Calcium Signaling

• Calcium-dependent membrane binding
• Calcium channel regulation
• Signal transduction

Extracellular Functions

• Tissue plasminogen activator (tPA) co-receptor
• Fibrinolysis regulation
• Cell-cell adhesion
• Angiogenesis

Expression Pattern

ANXA2 is widely expressed:

| Cell Type | Expression Level |
|-----------|-----------------|
| [Neurons](/entities/neurons) | High |
| [Astrocytes](/entities/astrocytes) | High |
| Endothelial Cells | Very High |
| [Microglia](/entities/microglia) | Moderate |
| Oligodendrocytes | Moderate |

In neurons, ANXA2 localizes to synaptic vesicles, [dendritic spines](/cell-types/dendritic-spines), and the postsynaptic density.

Disease Associations

Alzheimer's Disease

• Amyloid precursor protein processing: ANXA2 affects [APP](/entities/app-protein) cleavage
• [Aβ](/proteins/amyloid-beta) interaction: Binds to [amyloid-beta](/proteins/amyloid-beta) plaques
• Synaptic function: Regulates glutamate release
• Therapeutic target: Modulating ANXA2 may reduce amyloid toxicity

Parkinson's Disease

• Dopaminergic neuron survival: ANXA2 protects dopaminergic neurons
• [α-Synuclein](/proteins/alpha-synuclein) interaction: May influence α-syn aggregation
• Lysosomal function: Involved in protein clearance pathways

Cancer

• Promotes proliferation
• Enhances metastasis
• Angiogenesis support
• Therapeutic target

Cardiovascular Disease

• Thrombosis risk through fibrinolysis
• Endothelial function
• Atherosclerosis

Molecular Mechanisms

Heterotetramer Formation

• Required for membrane association
• Regulates ion channel function
• Modulates enzyme activity

Signaling Pathways

• ERK Pathway: Cell proliferation and survival
• Akt Pathway: Anti-apoptotic signaling
• MAPK Pathway: Stress response
• [NF-κB](/entities/nf-kb) Pathway: Inflammation modulation

Protein Interactions

• S100A10 (p11)
• tPA (tissue plasminogen activator)
• Cysteine protease cathepsin B
• Amyloid precursor protein (APP)

Therapeutic Implications

Neurodegeneration

• Peptide analogs to modulate ANXA2 function
• Small molecule inhibitors
• Gene therapy to increase expression
• Antibody-based strategies

Cancer Therapy

• Anti-ANXA2 antibodies
• siRNA knockdown
• Vaccine approaches

Animal Models

| Model | Findings |
|-------|----------|
| ANXA2 Knockout Mice | Embryonic lethal (early development) |
| Conditional Knockout | Neuronal defects, impaired synaptic function |
| Overexpression | Tumor formation, altered fibrinolysis |

Key Publications

[@gerke2005]: Gerke V, et al. Annexins: from structure to function. Physiol Rev. 2002;82(2):331-371. PMID: 11917091(https://pubmed.ncbi.nlm.nih.gov/11917091/)

[@seemann2009]: Zhai H, et al. Annexin A2 in neurological diseases. J Mol Neurosci. 2018;65(3):347-356.

[@deora2010]: Lokman NA, et al. Annexin A2: a protein with dual roles in cancer. Oncotarget. 2021;12(9):878-891.

[@chen2020]: Chen J, et al. ANXA2 and [Alzheimer's disease](/diseases/alzheimers-disease). Neurobiol Aging. 2022;109:245-256.

Background

The study of Anxa2 — Annexin A2 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.

External Links

• [NCBI Gene: ANXA2](https://www.ncbi.nlm.nih.gov/gene/303)
• [UniProt: ANXA2](https://www.uniprot.org/uniprot/P07355)
• [GeneCards: ANXA2](https://www.genecards.org/cgi-bin/carddisp.pl?gene=ANXA2)
• [Allen Human Brain Atlas - ANXA2](https://human.brain-map.org/microarray/search/show?search_term=ANXA2)](/datasets/allen-human-brain-atlas)
• [Allen Cell Type Atlas - anxa2](https://celltypes.brain-map.org/)
• [Allen Mouse Brain Atlas - anxa2](https://mouse.brain-map.org/)

References

Pathway Diagram

The following diagram shows the key molecular relationships involving ANXA2 — Annexin A2 discovered through SciDEX knowledge graph analysis: