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EC number: - | CAS number: -
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Skin irritation / corrosion
Administrative data
- Endpoint:
- skin irritation: in vitro / ex vivo
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Study period:
- not applicable
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- test procedure in accordance with national standard methods with acceptable restrictions
Data source
Reference
- Reference Type:
- publication
- Title:
- Differential cytotoxic effects of graphene and graphene oxide on skin keratinocytes
- Author:
- Pelin M. et al.
- Year:
- 2 017
- Bibliographic source:
- Sci. Rep. 7, 40572; doi: 10.1038/srep40572 (2017)
Materials and methods
Test guideline
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- In this study the in vitro effects of GO on human skin HaCaT keratinocytes, a spontaneously immortalized non-tumor cell line, were evaluated.
GOs effect on mitochondrial activity of HaCaT cells was evaluated by the 2-(2-methoxy-4-nitrophenyl)-3-(4-nitrophenyl)-5-(2,4-disulfophenyl)-2H-tetrazolium (WST-8) reduction assay.
GOs effects on HaCaT cells proliferation were evaluated by the sulforhodamine B (SRB) assay.
Cell membrane damages were evaluated by measuring Propidium iodide (PI) uptake (PI fluorescence inside the cells). - GLP compliance:
- not specified
- Remarks:
- no information on GLP compliance available in this publication
Test material
- Reference substance name:
- Reaction product of Graphite, acid-treated and potassium permanganate
- IUPAC Name:
- Reaction product of Graphite, acid-treated and potassium permanganate
- Test material form:
- solid: nanoform
Constituent 1
- Specific details on test material used for the study:
- Summarized materials properties of GO see Table 1 "Any other information on materials and methods"
GO was prepared using the improved Hummer's method. A mixture of concentrated H2SO4/H3PO4 (180:20 mL), was added into a mixture of powdered graphite (1.5 g) and KMnO4 (1.8 g). Then, the resulting mixture was heated to 50 °C and stirred for 12 h. The reaction was then cooled to RT and poured in ice water (200 mL) with addition of H2O2 (0.5 mL, 30%). The mixture was filtered and washed with water. The resulting wet solid was re-dissolved in water (200 mL) and dialyzed until neutral pH and colorless aqueous solution was observed. The dialyzed suspension was centrifuged (4000 rpm, 1 h) in order to separate the graphite material. The supernatant was filtered and washed with ethyl ether, obtaining 2.6 g of brown solid.
In vitro test system
- Test system:
- other: human keratinocytes cell line HaCaT
- Source species:
- human
- Cell type:
- non-transformed keratinocytes
- Cell source:
- other: human keratinocytes
- Details on animal used as source of test system:
- not applicable
- Justification for test system used:
- Initially, the effects of GO on cell viability was evaluated by means of mitochondrial activity of HaCaT cells after different exposure times (24 up to 72 h) by the WST-8 assay. This assay, widely used to investigate mitochondrial damages of different GBMs on a wide range of cell models, was preferred to the MTT assay since the latter can generate a nonspecific signal due to a possible spontaneous reduction of the MTT reagent by GO, leading to false positive overestimation of cell viability.
- Vehicle:
- unchanged (no vehicle)
- Details on test system:
- Cell Culture:
The human skin HaCaT cell line was purchased from Cell Line Service (DKFZ, Eppelheim, Germany) and all cell culture reagents were from Euroclone (Milan, Italy). Cells were maintained in DMEM high glucose supplemented with 10% FBS, 2 mM L-glutamine, 100 IU/mL penicillin and 0.1 mg/mL streptomycin. Cell cultures were maintained according to standard procedures in a humidified incubator at 37 °C with 5 % CO2, performing cell passages once a week. If not otherwise specified, for cytotoxicity experiments, cells were seeded in 96-wells plates at a density of 5 E3 cells/well. Experiments were carried out between passages 50 and 65.
Cells exposure to GO: For cytotoxicity assays, cells were exposed to GO (0.005 to 100 µg/mL) up to 72 h.
WST-8 reduction assay: GOs effect on mitochondrial activity of HaCaT cells was evaluated by the 2-(2-methoxy-4-nitrophenyl)-3-(4-nitrophenyl)-5-(2,4-disulfophenyl)-2H-tetrazolium (WST-8) reduction assay. After exposure to GO, cells were washed three times with PBS (200 µL/well) and incubated for 4 h with fresh medium (100 µL/well) containing 10 µL of WST-8 reagent. Absorbance was subsequently read at 450 nm by an Automated Microplate Reader EL 311 s (Bio-Tek Instruments, Winooski, VT, USA). Data are reported as % of mitochondrial activity in cells exposed to GO with respect to untreated control cells.
Sulforhodamine B (SRB) assay: GOs effects on HaCaT cells proliferation were evaluated by the sulforhodamine B assay. After exposure to GO, cells were washed three times with PBS (200 µL/well), fixed with 50% (v/v) trichloroacetic acid for 1 h at 4 °C and stained for 30 min with 0.4% SRB in 1% (v/v) acetic acid. After washings with 1% (v/v) acetic acid, the protein-bound dye was dissolved in 10 mM TRIZMA base solution and the absorbance was read by an Automated Microplate Reader EL 311 s (Bio-Tek Instruments, Winooski, VT, USA) at 570 nm. Data are reported as % of cell proliferation after GOs exposure with respect to untreated control cells.
Propidium iodide (PI) uptake: Cell membrane damages were evaluated by measuring PI fluorescence inside the cells. Briefly, ater exposure to GO, cells were washed three times with PBS and then exposed to 3.0 E-6 M PI in PBS for 30 min at 37 °C. As a positive control, 0.1% (vol/vol) Triton-X in PBS were added. Fluorescence intensity was read by a Fluorocount Microplate Fluorometer (Packard, Germany) with excitation wavelength of 485 nm and emission wavelength of 590 nm. Each sample was subsequently permeabilized with 0.1% Triton-X for 30 min to measure total fluorescence (index of total cell content). Data are reported as % of PI with respect to positive control cells, after normalization on cell content.
Statistical analysis:
Results are presented as mean ± SE from at least three independent experiments performed in triplicate. Non-linear regression of concentration-effect data was performed using GraphPad Prism version 4.00 for computing the concentration giving the 50% of the effect (EC50). Statistical differences among EC50 values were evaluated by Student t-test (significant differences, p < 0.05), data obtained by comparison of different GBMs were analyzed by a two-way ANOVA analysis followed by Bonferroni's post-test (PrismGraphPad, Inc.; San Diego, CA, USA) while data obtained by long-term analysis were analyzed by a one-way ANOVA analysis followed by Bonferroni's post-test (PrismGraphPad, Inc.; San Diego, CA, USA) and significant differences were considered at p < 0.05. - Control samples:
- yes, concurrent no treatment
- yes, concurrent positive control
- Amount/concentration applied:
- Applied concentrations: 0.005 to 100 µg/mL
- Duration of treatment / exposure:
- WST-8 assay: up to 72 h,
Sulforhodamine B (SRB) assay: up to 72 h,
Propidium iodide (PI) uptake: up to 72 h, - Duration of post-treatment incubation (if applicable):
- none
- Number of replicates:
- not specified
Results and discussion
In vitro
Results
- Irritation / corrosion parameter:
- other: mitochondrial activity, cell proliferation, cell membrane damage
- Vehicle controls validity:
- not specified
- Negative controls validity:
- not specified
- Positive controls validity:
- not specified
- Remarks on result:
- other: slight effects on mitochondrial activity, cell proliferation and membrane integrity after prolonged exposure to high test concentrations (up to 100 µg/mL)
Applicant's summary and conclusion
- Conclusions:
- Weakly cytotoxic effects of graphene oxide on HaCaT keratinocytes were found after prolonged exposure (72 h) to high concentrations of graphene oxide.
- Executive summary:
In this in vitro study, a potential cytotoxic effect of the test item graphene oxide on human epidermal keratinocytes (cell line HaCaT) was studied. The effect of graphene oxide (lateral dimension: 622 +/- 581 nm) on cell viability was evaluated by means of mitochondrial activity of HaCaT cells after different exposure times (24 up to 72 h) by the WST-8 reduction assay, the effect on cell proliferation was evaluated by the sulforhodamine B assay and cell membrane damages were evaluated by measuring the uptake of propidium iodide.
Low cytotoxic effects were observed in the WST-8 assay (mitochondrial activity), and cell proliferation was not modulated after exposure to up to 100 µg/mL graphene oxide for up to 48 h, whereas a prolonged exposure of 72 h slightly reduced cell proliferation by up to 15%. The EC50 value estimated for the PI uptake assay was 23.5 µg/mL.
Similar experiments were conducted in parallel for two additional graphene oxide test items with similar C/O ratios slightly larger sizes (lateral dimensions: 845 +/- 427 nm; 979 +/- 498 nm) found a very slight increase in effects on keratinocytes for these slightly larger test items.
These results suggest that only high concentrations and long exposure times to graphene oxide could impair mitochondrial activity associated with plasma membrane damage in keratinocytes, suggesting very low cytotoxic effects of graphene oxide in the skin.
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