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EC number: 201-762-9 | CAS number: 87-66-1
- 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
Repeated dose toxicity: other routes
Administrative data
- Endpoint:
- repeated dose toxicity: other route
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
Data source
Reference
- Reference Type:
- publication
- Title:
- Pyrogallol-induced hepatotoxicity in rats: a model to evaluate antioxidant hepatoprotective agents
- Author:
- Gupta Y.K., Sharma M. and Chaudhary G.
- Year:
- 2 002
- Bibliographic source:
- Methods Find Exp Clin Pharmacol. 24(8): 497-500
Materials and methods
- GLP compliance:
- not specified
- Limit test:
- yes
Test material
- Reference substance name:
- Pyrogallol
- EC Number:
- 201-762-9
- EC Name:
- Pyrogallol
- Cas Number:
- 87-66-1
- Molecular formula:
- C6H6O3
- IUPAC Name:
- benzene-1,2,3-triol
- Reference substance name:
- unknown impurities
- IUPAC Name:
- unknown impurities
- Test material form:
- not specified
- Details on test material:
- not specified
Constituent 1
impurity 1
- Specific details on test material used for the study:
- SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: Pyrogallol (S.D. Fine Chemicals Ltd, India) and silymarin (Ranbaxy, India)
- Expiration date of the lot/batch: not specified
- Purity test date: not specified
RADIOLABELLING INFORMATION (if applicable) not applicable
- Radiochemical purity: -
- Specific activity: -
- Locations of the label: -
- Expiration date of radiochemical substance: -
STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: not specified
- Stability under test conditions: not specified
- Solubility and stability of the test substance in the solvent/vehicle: not specified
- Reactivity of the test substance with the solvent/vehicle of the cell culture medium: not specified
TREATMENT OF TEST MATERIAL PRIOR TO TESTING
- Treatment of test material prior to testing: not specified
- Preliminary purification step (if any): not specified
- Final dilution of a dissolved solid, stock liquid or gel: pyrogallol (and silymarin) were dissolved in distilled water
- Final preparation of a solid: not specified
FORM AS APPLIED IN THE TEST (if different from that of starting material) : liquid
TYPE OF BIOCIDE/PESTICIDE FORMULATION (if applicable) : not applicable
OTHER SPECIFICS: All drugs were freshly prepared
Test animals
- Species:
- rat
- Strain:
- Wistar
- Remarks:
- albino
- Details on species / strain selection:
- not specified
- Sex:
- male/female
- Details on test animals or test system and environmental conditions:
- TEST ANIMALS
- Source: They were procured from the Central Animal House Facility, A.I.I.M.S, New Delhi.
- Females (if applicable) nulliparous and non-pregnant: [yes/no]
- Age at study initiation: not specified
- Weight at study initiation: between 200-250 g
- Fasting period before study: not specified
- Housing: The animals were housed in standard laboratory conditions
- Diet (e.g. ad libitum): standard rat chow ad libitum
- Water (e.g. ad libitum): tap water ad libitum
- Acclimation period: not specified
DETAILS OF FOOD AND WATER QUALITY: not specified
ENVIRONMENTAL CONDITIONS
- Temperature (°C): The animals were housed in standard laboratory conditions
- Humidity (%): The animals were housed in standard laboratory conditions
- Air changes (per hr): The animals were housed in standard laboratory conditions
- Photoperiod (hrs dark / hrs light): natural light/dark cycle
IN-LIFE DATES: From: To: not specified
Note: All procedures described were reviewed and approved by the Institutional Committee for the Ethical Use of Animals
Administration / exposure
- Route of administration:
- intraperitoneal
- Vehicle:
- water
- Remarks:
- dissolved in distilled water
- Details on exposure:
- The volume of drugs administered intraperitoneally using a 25-gauge hypodermic needle did not exceed 0.1 ml/100 g.
- Analytical verification of doses or concentrations:
- not specified
- Duration of treatment / exposure:
- 1 time
- Frequency of treatment:
- 1
Doses / concentrations
- Dose / conc.:
- 100 mg/kg bw (total dose)
- No. of animals per sex per dose:
- Each group consisted of 8 animals
- Control animals:
- not specified
- Details on study design:
- - Dose selection rationale: not specified
- Rationale for animal assignment (if not random): an equal number of males and females in each group
- Rationale for selecting satellite groups: not specified
- Post-exposure recovery period in satellite groups: not specified
- Section schedule rationale (if not random): not specified
Examinations
- Observations and examinations performed and frequency:
- CAGE SIDE OBSERVATIONS: Yes / No / No data
- Time schedule:
- Cage side observations checked in table [No.?] were included.
DETAILED CLINICAL OBSERVATIONS: Yes / No / No data
- Time schedule:
BODY WEIGHT: Yes / No / No data
- Time schedule for examinations:
FOOD CONSUMPTION:
- Food consumption for each animal determined and mean daily diet consumption calculated as g food/kg body weight/day: Yes / No / No data
FOOD EFFICIENCY:
- Body weight gain in kg/food consumption in kg per unit time X 100 calculated as time-weighted averages from the consumption and body weight gain data: Yes / No / No data
WATER CONSUMPTION: Yes / No / No data
- Time schedule for examinations:
OPHTHALMOSCOPIC EXAMINATION: Yes / No / No data
- Time schedule for examinations:
- Dose groups that were examined:
HAEMATOLOGY: Yes / No / No data
- Time schedule for collection of blood:
- Anaesthetic used for blood collection: Yes (identity) / No / No data
- Animals fasted: Yes / No / No data
- How many animals:
- Parameters checked in table [No.?] were examined.
CLINICAL CHEMISTRY: Yes / No / No data
- Time schedule for collection of blood:
- Animals fasted: Yes / No / No data
- How many animals:
- Parameters checked in table [No.?] were examined.
URINALYSIS: Yes / No / No data
- Time schedule for collection of urine:
- Metabolism cages used for collection of urine: Yes / No / No data
- Animals fasted: Yes / No / No data
- Parameters checked in table [No.?] were examined.
NEUROBEHAVIOURAL EXAMINATION: Yes / No / No data
- Time schedule for examinations:
- Dose groups that were examined:
- Battery of functions tested: sensory activity / grip strength / motor activity / other:
OTHER: - Sacrifice and pathology:
- GROSS PATHOLOGY: No
HISTOPATHOLOGY: rats were sacrificed and the liver removed and processed for MDA and GSH (oxidative stress markers) and tissue histology.
MDA was determined by thiobarbituric acid reaction according to the method of Ohkawa.
GSH was measured according to the method of Ellman. - Other examinations:
- blood was withdrawn by cardiac puncture for the estimation of serum markers (AST, ALT, Alkaline phosphatase).
Activity of serum AST and ALT were measured according to the method described by Reitman and Frankel . Alkaline phosphatase was determined according to the method of Kind and King. - Statistics:
- The results are expressed as Mean ± SEM. Statistical significance was evaluated by Student’s t-test and p < 0.05 was regarded as significant.
Results and discussion
Results of examinations
- Clinical signs:
- not examined
- Mortality:
- not examined
- Body weight and weight changes:
- not examined
- Food consumption and compound intake (if feeding study):
- not examined
- Food efficiency:
- not examined
- Water consumption and compound intake (if drinking water study):
- not examined
- Ophthalmological findings:
- not examined
- Haematological findings:
- effects observed, treatment-related
- Clinical biochemistry findings:
- not examined
- Urinalysis findings:
- not examined
- Behaviour (functional findings):
- not examined
- Immunological findings:
- not examined
- Organ weight findings including organ / body weight ratios:
- not examined
- Gross pathological findings:
- not examined
- Neuropathological findings:
- not examined
- Histopathological findings: non-neoplastic:
- effects observed, treatment-related
- Description (incidence and severity):
- The pyrogallol-treated rats showed mild inflammatory changes in the liver. The changes included cellular infiltration of leukocytes and sinusoidal dilation even as early as 1 h after pyrogallol administration.
- Histopathological findings: neoplastic:
- not examined
- Other effects:
- not examined
Effect levels
- Dose descriptor:
- LOAEL
- Effect level:
- 100 mg/kg bw (total dose)
- Based on:
- test mat. (dissolved fraction)
- Sex:
- male/female
- Basis for effect level:
- histopathology: non-neoplastic
Target system / organ toxicity
- Critical effects observed:
- yes
- Lowest effective dose / conc.:
- 100 mg/kg bw (total dose)
- Organ:
- liver
- Treatment related:
- yes
- Dose response relationship:
- not specified
- Relevant for humans:
- not specified
Any other information on results incl. tables
Free radicals and oxidative stress play an important role in the pathogenesis of various liver diseases.
Pyrogallol administration caused a significant increase in serum AST and ALT compared with control animals, thereby indicating liver damage. This may be due to the fact that damage to the structural integrity of the liver is reflected by an increase in the levels of serum enzymes (AST and ALT) because these are cytoplasmic in location and are released into circulation after hepatocellular damage. However, there was an insignificant change in the levels of alkaline phosphatase in the pyrogallol-treated group compared with the controls.
This may be because alkaline phosphatase is an inducible enzyme, which takes time to be induced, prior to seeing an increased level in the serum.
There was an increased level of MDA and GSH in the liver of rats treated with pyrogallol compared with the control group. The increased MDA levels indicated increased lipid peroxidation by pyrogallol. Raised levels of GSH were also observed 1 h after pyrogallol administration.
The increase in GSH may be due to a compensatory increase by the liver tissue to combat the free radical insult. Pyrogallol is a potent generator of superoxide anion (O2–) and also generates hydroxyl radical (OH•) and hydrogen peroxide by the Haber-Weiss reaction (O2– ±H2O2/OH• ± O2
– ± O2). The increased free radical generation by pyrogallol may lead to its hepatotoxicity.
The histological studies in the liver tissues showed mild inflammatory changes even as early as 1 h after pyrogallol treatment.
Applicant's summary and conclusion
- Conclusions:
- Intraperitoneal injection of pyrogallol in rats can be used as a model to induce hepatotoxicity.
Pyrogallol (100 mg/kg i.p.) produced significant (i) liver damage, as indicated by a marked increase in serum AST and ALT in comparison with the control group (p < 0.05), (ii) significant oxidative stress in liver tissue as indicated by the marked increase in MDA and glutathione levels compared with the control group and (iii) increasing in the Glutathione levels to 37 ± 2.25 mg/g wet tissue compared with control values of 24.4 ± 3.6 mg/g wet tissue (p < 0.05).
The pyrogallol-treated rats showed mild inflammatory changes in the liver. - Executive summary:
Various hepatic disorders and hepatotoxic agents are associated with increased free radical generation. In the present study, the free radical generator pyrogallol (100 mg/kg i.p.) caused significant hepatic damage. The serum enzymes aspartate aminotransaminase (AST) and alanine aminotransaminase (ALT) increased to 357 ± 30.7 IU/I and 147.8 ± 28.4 IU/I, respectively in the pyrogallol-treated group compared with 208.4 ± 4.1 IU/I and 84.5 ± 19.5 IU/I, respectively in the control rats. Compared with control rats, the liver tissue in the pyrogallol-treated group showed an increased level of malondialdehyde (MDA) as well as glutathione (GSH). The infiltration of white blood cells into the liver tissue, as seen histologically, further substantiated liver damage. Pretreatment with a standard hepatoprotective drug (silymarin, 100 mg/kg i.p.) afforded significant protection against pyrogallol hepatotoxicity, as evidenced by amelioration of the raised serum markers of hepatic function, markers of oxidative stress and normal liver histology. Thus, pyrogallol-induced hepatotoxicity could be used as an appropriate model to evaluate hepatoprotective agents that have an antioxidant property.
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