Chang Liver (HeLa) Cells








General information
Description | The Chang Liver cell line, originally believed to be derived from normal human liver tissue, has undergone significant reclassification following advanced genetic profiling. STR PCR DNA profiling techniques have demonstrated that the Chang Liver cell line is indistinguishable from the HeLa cell line, suggesting that it is not derived from hepatocyte cells as previously thought, but rather should be considered a HeLa derivative. This revelation has important implications for researchers using this cell line, emphasizing the need for careful interpretation of experimental results derived from its use. HeLa cells, originally taken from Henrietta Lacks, a Black woman, in the early 1950s, are known for their robust growth and genetic stability in vitro, characteristics likely shared by the Chang Liver cell line given its genetic similarity. This background necessitates that studies employing the Chang Liver cell line in research related to liver function or diseases may need to be re-evaluated or confirmed with additional hepatocyte-specific models. The misidentification also highlights broader issues in cell culture practices, including cross-contamination and mislabeling, underscoring the importance of regular authentication of cell lines used in research settings. |
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Organism | Human |
Tissue | Liver |
Disease | Adenocarcinoma |
Synonyms | Chang-liver, Chang Cells, Chang, CHL |
Characteristics
Age | 30 years |
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Gender | Female |
Morphology | Epithelial-like |
Growth properties | Adherent |
Identifiers / Biosafety / Citation
Citation | Chang Liver (HeLa) (Cytion catalog number 300139) |
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Biosafety level | 1 |
Expression / Mutation
Isoenzymes | G6PD, A |
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Tumorigenic | Yes, in Syrian hamsters |
Viruses | Tested MHV (mouse hepatitis virus) negative |
Virus susceptibility | Poliovirus 1, 2, 3, adenovirus 3, vesicular stomatitis (Indiana) |
Reverse transcriptase | negative |
Products | keratin |
Handling
Culture Medium | EMEM (MEM Eagle), w: 2 mM L-Glutamine, w: 2.2 g/L NaHCO3, w: EBSS (Cytion article number 820100a) |
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Medium supplements | Supplement the medium with 10% FBS and 1% NEAA |
Passaging solution | Accutase |
Subculturing | Remove the old medium from the adherent cells and wash them with PBS that lacks calcium and magnesium. For T25 flasks, use 3-5 ml of PBS, and for T75 flasks, use 5-10 ml. Then, cover the cells completely with Accutase, using 1-2 ml for T25 flasks and 2.5 ml for T75 flasks. Let the cells incubate at room temperature for 8-10 minutes to detach them. After incubation, gently mix the cells with 10 ml of medium to resuspend them, then centrifuge at 300xg for 3 minutes. Discard the supernatant, resuspend the cells in fresh medium, and transfer them into new flasks that already contain fresh medium. |
Split ratio | A ratio of 1:4 to 1:8 is recommended |
Seeding density | 1 x 10^4 cells/cm^2 will yield in a confluent layer in about 4 days |
Fluid renewal | 2 to 3 times per week |
Freezing recovery | After thawing, plate the cells at 5 x 10^4 cells/cm^2 and allow the cells to recover from the freezing process and to adhere for at least 24 hours. |
Freeze medium | CM-1 (Cytion catalog number 800100) |
Handling of cryopreserved cultures |
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Quality control / Genetic profile / HLA
Sterility | Mycoplasma contamination is excluded using both PCR-based assays and luminescence-based mycoplasma detection methods. To ensure there is no bacterial, fungal, or yeast contamination, cell cultures are subjected to daily visual inspections. |
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STR profile |
Amelogenin: x,x
CSF1PO: 10
D13S317: 12,13.3
D16S539: 9,1
D5S818: 12
D7S820: 8,12
TH01: 7
TPOX: 8,12
vWA: 16,18
D3S1358: 15,18
D21S11: 27,28
D18S51: 16
Penta E: 7,17
Penta D: 8,15
D8S1179: 12,13
FGA: 21
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HLA alleles |
A*: '68:02:01
B*: '15:03:01
C*: '12:03:01
DRB1*: '01:02:01
DQA1*: '01:01:02
DQB1*: '05:01:01
DPB1*: '01:01:01
E: '01:03:02
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Required products
What's in EMEM?
EMEM is a modified version of Eagle's minimum essential medium, containing Earle's Balanced Salt Solution, non-essential amino acids, L-glutamine, sodium pyruvate, and sodium bicarbonate. It's important to note that this level of sodium bicarbonate is intended for use in 5% CO2 in the air. To maintain its effectiveness, storing the medium at 2°C to 8°C in the dark when not in use is recommended.
What is EMEM used for?
Eagle's minimal essential medium (EMEM) is a cell culture medium that can maintain cells in tissue culture. The medium contains higher concentrations of amino acids, allowing for a more accurate approximation of the protein composition of cultured mammalian cells. EMEM may be used to cultivate various cells, including fibroblasts, human liver cancer cell line (HepG2) cells and human fetal brain progenitor-derived astrocyte cells (PDA). It is typically used in the presence of fetal bovine serum (FBS), calf, or horse sera.
How is EMEM different from other cell culture media?
While EMEM and Dulbecco's modified Eagle's medium (DMEM) share some similarities, they also differ. Both media lack protein and contain the amino acids, salts, glucose, and vitamins required to provide a cell with energy and maintain it in tissue culture. However, the DMEM formulation is modified to contain up to four times more vitamins and amino acids and two to four times more glucose than EMEM. It's worth noting that EMEM is also different from the original MEM formulation.
Quality Control
Sterile-filtered
Storage and Shelf Life
Store at +2°C to +8°C, protected from light.
Once opened, store at 4°C and use within 6–8 weeks.
Shipping Conditions
Ambient temperature
Maintenance
Keep refrigerated at +2°C to +8°C in the dark. Avoid freezing and frequent warming to +37°C, as it reduces product quality.
Do not heat the medium beyond 37°C or use uncontrolled heat sources such as microwave appliances.
If only part of the medium is to be used, remove the required amount and warm it to room temperature before use.
Composition
Category
Components
Concentration (mg/L)
Amino Acids
L-Arginine HCl
126.00
L-Cystine 2 HCl
31.30
L-Glutamine
292.00
L-Histidine HCl H2O
42.00
L-Isoleucine
52.00
L-Leucine
52.00
L-Lysine HCl
72.50
L-Methionine
15.00
L-Phenylalanine
32.00
L-Threonine
48.00
L-Tryptophan
10.00
L-Tyrosine 2 Na 2 H2O
51.90
L-Valine
46.00
Vitamins
Choline Chloride
1.00
Vitamins
D-Calcium Pantothenate
1.00
Folic Acid
1.00
myo-Inositol
2.00
Nicotinamide
1.00
Pyridoxal HCl
1.00
Riboflavin
0.10
Thiamine HCl
1.00
Inorganic Salts
CaCl2 2 H2O
265.00
Inorganic Salts
KCl
400.00
MgSO4
97.67
NaCl
6800.00
NaHCO3
2200.00
NaH2PO4
122.00
Other Components
D-Glucose
1000.00
Other Components
Phenol Red Sodium Salt
11.00
- A Gentle Alternative to Trypsin
Accutase is a cell detachment solution that is revolutionizing the cell culture industry. It is a mix of proteolytic and collagenolytic enzymes that mimics the action of trypsin and collagenase. Unlike trypsin, Accutase does not contain any mammalian or bacterial components and is much gentler on cells, making it an ideal solution for the routine detachment of cells from standard tissue culture plasticware and adhesion coated plasticware. In this blog post, we will explore the benefits and uses of Accutase and how it is changing the game in cell culture.
Advantages of Accutase
Accutase has several advantages over traditional trypsin solutions. Firstly, it can be used whenever gentle and efficient detachment of any adherent cell line is needed, making it a direct replacement for trypsin. Secondly, Accutase works extremely well on embryonic and neuronal stem cells, and it has been shown to maintain the viability of these cells after passaging. Thirdly, Accutase preserves most epitopes for subsequent flow cytometry analysis, making it ideal for cell surface marker analysis.
Additionally, Accutase does not need to be neutralized when passaging adherent cells. The addition of more media after the cells are split dilutes Accutase so it is no longer able to detach cells. This eliminates the need for an inactivation step and saves time for cell culture technicians. Finally, Accutase does not need to be aliquoted, and a bottle is stable in the refrigerator for 2 months.
Applications of Accutase
Accutase is a direct replacement for trypsin solution and can be used for the passaging of cell lines. Additionally, Accutase performs well when detaching cells for the analysis of many cell surface markers using flow cytometry and for cell sorting. Other downstream applications of Accutase treatment include analysis of cell surface markers, virus growth assay, cell proliferation, tumor cell migration assays, routine cell passage, production scale-up (bioreactor), and flow cytometry.
Composition of Accutase
Accutase contains no mammalian or bacterial components and is a natural enzyme mixture with proteolytic and collagenolytic enzyme activity. It is formulated at a much lower concentration than trypsin and collagenase, making it less toxic and gentler, but just as effective.
Efficiency of Accutase
Accutase has been shown to be efficient in detaching primary and stem cells and maintaining high cell viability compared to animal origin enzymes such as trypsin. 100% of cells are recovered after 10 minutes, and there is no harm in leaving cells in Accutase for up to 45 minutes, thanks to autodigestion of Accutase.
In summary
In conclusion, Accutase is a powerful solution that is changing the game in cell culture. With its gentle nature, efficiency, and versatility, Accutase is the ideal alternative to trypsin. If you are looking for a reliable and efficient solution for cell detachment, Accutase is the solution for you.
Phosphate-buffered saline (PBS) is a widely used buffer solution in biological and chemical research. It plays a crucial role in maintaining the pH balance and osmolarity during various experimental procedures, including tissue processing and cell culture. Our PBS solution is meticulously formulated with high-purity ingredients to ensure stability and reliability in every experiment. The osmolarity and ion concentrations of our PBS closely mimic those of the human body, making it isotonic and non-toxic to most cells.
Composition of Our PBS Solution
Our PBS solution is a pH-adjusted blend of ultrapure-grade phosphate buffers and saline solutions. At a 1X working concentration, it contains:
8000 mg/L Sodium chloride (NaCl)
200 mg/L Potassium chloride (KCl)
1150 mg/L Sodium phosphate dibasic anhydrous (Na2HPO4)
200 mg/L Potassium phosphate monobasic anhydrous (KH2PO4)
This composition ensures an optimal pH and ionic balance, suitable for a wide range of biological applications.
Applications of Our PBS Solution
Our PBS solution is ideal for various applications in biological research. Its isotonic and non-toxic properties make it suitable for substance dilution and cell container rinsing. PBS solutions containing EDTA are effective for disengaging attached and clumped cells. However, divalent metals such as zinc should not be added to PBS, as this can cause precipitation. In such cases, Good's buffers are recommended. Additionally, our PBS solution is an acceptable alternative to viral transport medium for the transport and storage of RNA viruses, including SARS-CoV-2.
Quality Control
Sterile-filtered
Storage and Shelf Life
Store at +2°C to +25°C, protected from light.
Once opened, store at 2°C to 25°C and use within 24 months.
Shipping Conditions
Ambient temperature
Maintenance
Keep refrigerated at +2°C to +8°C in the dark. Avoid freezing and frequent warming to +37°C, as it reduces product quality.
Do not heat the medium beyond 37°C or use uncontrolled heat sources such as microwave appliances.
If only part of the medium is to be used, remove the required amount and warm it to room temperature before use.
Composition
Category
Components
Concentration (mg/L)
Salts
Potassium chloride
200
Potassium phosphate monobasic anhydrous
200
Sodium chloride
8000
Sodium phosphate dibasic anhydrous
1150