HEK293 Cell Line
<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">HEK293 Cell Line</th>
</tr>
<tr>
<td class="label">Marker</td>
<td>Expression</td>
</tr>
<tr>
<td class="label">E1A</td>
<td>Positive</td>
</tr>
<tr>
<td class="label">E1B</td>
<td>Positive</td>
</tr>
<tr>
<td class="label">Cytokeratin 8/18</td>
<td>Positive</td>
</tr>
<tr>
<td class="label">Na+/K+ ATPase</td>
<td>Positive</td>
</tr>
<tr>
<td class="label">GAPDH</td>
<td>Positive</td>
</tr>
<tr>
<td class="label">p53</td>
<td>Mutant</td>
</tr>
<tr>
<td class="label">Disease</td>
<td>HEK293 Application</td>
</tr>
<tr>
<td class="label">Alzheimer's</td>
<td>APP processing, Aβ secretion, tau phosphorylation</td>
</tr>
<tr>
<td class="label">Parkinson's</td>
<td>α-Synuclein aggregation, LRRK2 kinase activity</td>
</tr>
<tr>
<td class="label">Huntington's</td>
<td>Mutant huntingtin expression, aggregation</td>
</tr>
<tr>
<td class="label">ALS</td>
<td>SOD1, TDP-43 aggregation studies</td>
</tr>
<tr>
<td class="label">Feature</td>
<td>HEK293</td>
</tr>
<tr>
<td class="label">Species</td>
<td>Human</td>
</tr>
<tr>
<td class="label">Origin</td>
<td>Kidney</td>
</tr>
<tr>
<td class="label">Neuronal differentiation</td>
<td>Limited</td>
</tr>
<tr>
<td class="label">Transfection efficiency</td>
<td>Very high (80-90%)</td>
</tr>
<tr>
<td class="label">Common use</td>
<td>Protein expression</td>
</tr>
</table>
Overview
Mermaid diagram (expand to render)
HEK293 (Human Embryonic Kidney 293) is one of the most widely used cell lines in biomedical research, derived from human embryonic kidney cells transformed with adenovirus type 5 DNA [1][2]. Since its establishment in the 1970s, HEK293 cells have become a fundamental tool for protein expression, drug discovery, virology, and neurodegenerative disease research [3][4]. [@hayden2008]
The cell line's excellent transfectability, robust growth characteristics, and human origin make it ideal for studying human protein function and disease mechanisms. HEK293 cells have been instrumental in understanding protein trafficking, signal transduction, and neurotoxicity pathways relevant to Alzheimer's disease and Parkinson's disease [5][6]. [@macdonald2009]
Origin and History
Discovery and Establishment
The HEK293 cell line was established in 1973 by Dr. Alex van der Eb at the University of Leiden, Netherlands [1]. The cells were derived from normal human embryonic kidney cells that were transformed with sheared adenovirus type 5 (Ad5) DNA. The transformation was accidental—Dr. van der Eb's technician, who was pregnant at the time, provided the fetal kidney tissue, and the adenovirus DNA integration resulted in immortalization [2]. [@thinakaran2008]
The original transformation produced a cell line with unusual properties: indefinite lifespan while retaining many characteristics of human cells. The "293" in the name refers to the experiment number—the 293rd experiment in the series that successfully produced the immortalized line [1]. [@vekrellis2010]
Genetic Background
HEK293 cells have been extensively characterized genomically: [@tian2008]
- Karyotype: HEK293 cells are hypotriploid with approximately 64-70 chromosomes [7]
- Origin tissue: Cortex of kidney from a healthy human fetus (therapeutic abortion, approximately 18-20 weeks gestation)
- Primary transformation: Adenovirus type 5 (Ad5) E1A and E1B genes integrated into the genome [3]
The adenovirus E1A gene is the key immortalizing component, disrupting cell cycle controls and allowing continuous proliferation [8]. [@tiscornia2006]
Cellular Characteristics
Morphology and Growth
HEK293 cells exhibit distinct morphological features: [@obrien2011]
- Cell shape: Epithelial-like, polygonal with well-defined borders
- Nucleus: Large, prominent nucleolus
- Growth pattern: Adherent monolayer culture
- Population doubling time: Approximately 24-36 hours
- Saturation density: High (confluency可以达到 100%)
Key Molecular Markers
Signaling Pathways
HEK293 cells express functional versions of many human signaling pathways relevant to neurodegeneration: [@lin2014]
- PI3K/Akt pathway: Functional, important for cell survival studies [9]
- MAPK/ERK pathway: Intact, used for studying growth factor signaling [10]
- NF-κB pathway: Active, relevant for neuroinflammation studies [11]
- Wnt/β-catenin pathway: Can be activated for developmental studies [12]
Applications in Neurodegeneration Research
Protein Expression and Purification
HEK293 cells are the workhorse for recombinant protein production:
Neurodegeneration-related proteins: Amyloid precursor protein (APP), tau, α-synuclein, LRRK2, and GBA have been expressed in HEK293 cells for functional studies [13][14]
Membrane proteins: Ion channels, GPCRs, and neurotransmitter receptors are commonly expressed for electrophysiology [15]
Post-translational modifications: Human-like glycosylation and phosphorylation patternsTransfection Studies
HEK293 cells are highly transfectable with:
- Transient transfection: Calcium phosphate, lipofection, electroporation efficiencies of 50-90%
- Stable cell line generation: Selection with puromycin, hygromycin, or G418
- Viral transduction: Excellent for lentiviral and adenoviral delivery of shRNA or CRISPR constructs [16]
Disease Modeling
HEK293 cells are used to model neurodegenerative disease mechanisms:
Drug Screening
HEK293 cells are platform for high-throughput screening:
- Compound libraries: Testing small molecules for neuroprotective effects
- Toxicity screening: Assessing drug-induced cytotoxicity in human cells
- Mechanism of action: Studying how candidate drugs modulate disease pathways [23]
Transfection Protocols
Transient Transfection with Lipofectamine
Reagents:
- HEK293 cells (70-80% confluency)
- Lipofectamine 3000 or similar
- Plasmid DNA (1-2 μg per well for 6-well plate)
- Opti-MEM medium
Procedure:
Seed cells 24 hours before transfection (0.5-1 × 10⁶ cells per well in 6-well plate)
Prepare DNA-lipid complexes in Opti-MEM (1:2 ratio of μg DNA to μL Lipofectamine)
Incubate complexes for 15 minutes at room temperature
Add complexes dropwise to cells
Incubate 4-6 hours, then replace with complete medium
Harvest 24-72 hours post-transfection [24]Stable Cell Line Generation
Transfect cells with plasmid containing resistance gene
Begin selection 48 hours post-transfection
Maintain in selection antibiotic for 2-3 weeks
Pick and expand individual colonies
Screen for desired expression levelCRISPR/Cas9 Editing
HEK293 cells are easily edited using CRISPR:
- Knockout: sgRNA targeting exon 1 of gene of interest
- Knock-in: HDR template with puromycin resistance
- Knockdown: Lentiviral shRNA or CRISPRi [25]
Comparison with Other Cell Lines
Limitations
- Tumor-derived: May not fully represent normal cell physiology
- Kidney origin: Not neuronal, limiting certain applications
- Adenoviral genes: E1A may interfere with some cellular processes
- Genetic instability: Can accumulate chromosomal abnormalities over time [26]
See Also
Pathway Diagram
The following diagram shows the key molecular relationships involving HEK293 Cell Line discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)