Associated High Confidence AOPs
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Associated AOPs with Level of Relevance 1
AOPs with at least 1 KE associated with chemical, where the KE(s) are neither MIE nor AO
AOP Identifier AOP Title AO Classification OECD Status Coverage Score KE Identifier KE Name
AOP:42Inhibition of Thyroperoxidase and Subsequent Adverse Neurodevelopmental Outcomes in MammalsCognitive DisorderWPHA/WNT Endorsed0.12KE:277
Thyroid hormone synthesis, Decreased
AOP:54Inhibition of Na+/I- symporter (NIS) leads to learning and memory impairmentDevelopmental Disorder Of Mental HealthWPHA/WNT Endorsed0.1KE:277
Thyroid hormone synthesis, Decreased
AOP:110Inhibition of iodide pump activity leading to follicular cell adenomas and carcinomas (in rat and mouse)Cancer; Endocrine System Disease-0.14KE:277
Thyroid hormone synthesis, Decreased
AOP:112Increased dopaminergic activity leading to endometrial adenocarcinomas (in Wistar rat)Reproductive System Disease; Cancer-0.17KE:111
Agonism, Estrogen receptor
AOP:119Inhibition of thyroid peroxidase leading to follicular cell adenomas and carcinomas (in rat and mouse)Cancer; Endocrine System Disease-0.14KE:277
Thyroid hormone synthesis, Decreased
AOP:122Prolyl hydroxylase inhibition leading to reproductive dysfunction via increased HIF1 heterodimer formationUnclassified-0.1KE:799
Increased, HIF-1 heterodimer
AOP:134Sodium Iodide Symporter (NIS) Inhibition and Subsequent Adverse Neurodevelopmental Outcomes in MammalsCognitive Disorder-0.11KE:277
Thyroid hormone synthesis, Decreased
AOP:136Intracellular Acidification Induced Olfactory Epithelial Injury Leading to Site of Contact Nasal TumorsBenign Neoplasm; Respiratory System DiseaseUnder Review0.14KE:768
Increase, Cytotoxicity
AOP:159Thyroperoxidase inhibition leading to increased mortality via reduced anterior swim bladder inflationUnclassifiedWPHA/WNT Endorsed0.12KE:277
Thyroid hormone synthesis, Decreased
AOP:175Thyroperoxidase inhibition leading to altered amphibian metamorphosisUnclassified-0.25KE:277
Thyroid hormone synthesis, Decreased
AOP:176Sodium Iodide Symporter (NIS) Inhibition leading to altered amphibian metamorphosisUnclassified-0.2KE:277
Thyroid hormone synthesis, Decreased
AOP:192Pendrin inhibition leading to altered amphibian metamorphosisUnclassified-0.25KE:277
Thyroid hormone synthesis, Decreased
AOP:193Dual oxidase (DUOX) inhibition leading to altered amphibian metamorphosisUnclassified-0.25KE:277
Thyroid hormone synthesis, Decreased
AOP:207NADPH oxidase and P38 MAPK activation leading to reproductive failure in Caenorhabditis elegansReproductive System Disease-0.12KE:1280
Activation, HIF-1
AOP:232NFE2/Nrf2 repression to steatosisGastrointestinal System Disease; Inherited Metabolic Disorder-0.12KE:1419
Reduced, FXR activity
AOP:263Uncoupling of oxidative phosphorylation leading to growth inhibition via decreased cell proliferationUnclassifiedWPHA/WNT Endorsed0.25KE:1821
Decrease, Cell proliferation
AOP:267Uncoupling of oxidative phosphorylation leading to growth inhibition via glucose depletionUnclassifiedUnder Development0.2KE:1821
Decrease, Cell proliferation
AOP:268Uncoupling of oxidative phosphorylation leading to growth inhibition via mitochondrial swellingUnclassifiedUnder Development0.25KE:2072
Increase, Mitochondrial swelling
AOP:271Inhibition of thyroid peroxidase leading to impaired fertility in fishUnclassifiedUnder Development0.2KE:277
Thyroid hormone synthesis, Decreased
AOP:286Mitochondrial complex III antagonism leading to growth inhibition (1)Unclassified-0.25KE:1821
Decrease, Cell proliferation
AOP:288Inhibition of 17α-hydrolase/C 10,20-lyase (Cyp17A1) activity leads to birth reproductive defects (cryptorchidism) in male (mammals)Endocrine System Disease-0.12KE:1614
Decrease, androgen receptor activation
AOP:290Mitochondrial ATP synthase antagonism leading to growth inhibition (1)Unclassified-0.25KE:1821
Decrease, Cell proliferation
AOP:297Inhibition of retinaldehyde dehydrogenase leads to population declineUnclassifiedUnder Development0.17KE:1643
Altered, Visual function
AOP:303Frustrated phagocytosis-induced lung cancerCancerUnder Development0.14KE:1669
Increased, DNA damage and mutation
AOP:3055α-reductase inhibition leading to short anogenital distance (AGD) in male (mammalian) offspringUnclassifiedUnder Development0.2KE:1614
Decrease, androgen receptor activation
AOP:327Excessive reactive oxygen species production leading to mortality (1)Unclassified-0.2KE:1769
Increase, Body fluid overload
AOP:328Excessive reactive oxygen species production leading to mortality (2)Unclassified-0.2KE:1770
Decrease, Mitochondrial membrane potential
AOP:331Excessive reactive oxygen species leading to growth inhibition via oxidative DNA damage and reduced cell proliferationUnclassified-0.33KE:1821
Decrease, Cell proliferation
KE:1505
Cell cycle, disrupted
AOP:332Excessive reactive oxygen species leading to growth inhibition via lipid peroxidation and reduced cell proliferationUnclassified-0.4KE:1821
Decrease, Cell proliferation
KE:1505
Cell cycle, disrupted
AOP:333Excessive reactive oxygen species leading to growth inhibition via uncoupling of oxidative phosphorylationUnclassified-0.2KE:1821
Decrease, Cell proliferation
AOP:363Thyroperoxidase inhibition leading to altered visual function via altered retinal layer structureUnclassifiedUnder Review0.25KE:277
Thyroid hormone synthesis, Decreased
KE:1643
Altered, Visual function
AOP:364Thyroperoxidase inhibition leading to altered visual function via decreased eye sizeUnclassifiedUnder Development0.25KE:277
Thyroid hormone synthesis, Decreased
KE:1643
Altered, Visual function
AOP:365Thyroperoxidase inhibition leading to altered visual function via altered photoreceptor patterningUnclassifiedUnder Development0.25KE:277
Thyroid hormone synthesis, Decreased
KE:1643
Altered, Visual function
AOP:379Binding to ACE2 leading to thrombosis and disseminated intravascular coagulationCardiovascular System DiseaseUnder Development0.14KE:1845
Coagulation
AOP:387Deposition of ionising energy leading to population decline via mitochondrial dysfunctionReproductive System Disease-0.12KE:1770
Decrease, Mitochondrial membrane potential
AOP:399Inhibition of Fyna leading to increased mortality via decreased eye size (Microphthalmos)Unclassified-0.25KE:1821
Decrease, Cell proliferation
KE:1643
Altered, Visual function
AOP:409Frustrated phagocytosis leads to malignant mesotheliomaCancer-0.12KE:1669
Increased, DNA damage and mutation
AOP:440Hypothalamus estrogen receptors activity suppression leading to ovarian cancer via ovarian epithelial cell hyperplasiaBenign Neoplasm; Endocrine System Disease; Reproductive System Disease; Reproductive System Disease; Cancer; Endocrine System DiseaseUnder Development0.11KE:1973
Increased, estrogens
AOP:441Ionizing radiation-induced DNA damage leads to microcephaly via apoptosis and premature cell differentiationCongenital Nervous System Abnormality; Nervous System Disease-0.14KE:1974
Activation of Tumor Protein 53
AOP:446PM-related Adverse outcome pathway frameworks on various systemsRespiratory System Disease-0.1KE:18
Activation, AhR
KE:165
Activation, Long term AHR receptor driven direct and indirect gene expression changes
AOP:449Ceramide synthase inhibition leading to neural tube defectsNeural Tube Defect-0.14KE:1502
Histone deacetylase inhibition
AOP:451Interaction with lung resident cell membrane components leads to lung cancerCancer-0.11KE:1669
Increased, DNA damage and mutation
AOP:452Adverse outcome pathway of PM-induced respiratory toxicityRespiratory System Disease-0.09KE:2013
Airway remodeling
AOP:457Succinate dehydrogenase inhibition leading to increased insulin resistance through reduction in circulating thyroxineInherited Metabolic Disorder-0.17KE:277
Thyroid hormone synthesis, Decreased
AOP:460Antagonism of Smoothened receptor leading to orofacial cleftingUnclassifiedUnder Development0.11KE:1821
Decrease, Cell proliferation
AOP:465Alcohol dehydrogenase leading to reproductive dysfunctionUnclassified-0.12KE:748
Increased, Estrogen receptor (ER) activity
AOP:491Decrease, GLI1/2 target gene expression leads to orofacial cleftingUnclassifiedUnder Development0.17KE:1821
Decrease, Cell proliferation
AOP:510Demethylation of PPAR promotor leading to vascular disrupting effectsCardiovascular System Disease-0.1KE:2165
Activation of PPAR
AOP:520Retinoic acid receptor agonism during neurodevelopment leading to impaired learning and memoryDevelopmental Disorder Of Mental Health-0.2KE:2204
Altered brain morphology

Associated AOPs with Level of Relevance 2
AOPs with at least 1 AO associated with chemical, and no associated MIE
AOP Identifier AOP Title AO Classification OECD Status Coverage Score KE Identifier KE Name
AOP:37PPARα activation leading to hepatocellular adenomas and carcinomas in rodentsCancer; Gastrointestinal System DiseaseUnder Development0.4KE:719
Increase, hepatocellular adenomas and carcinomas
KE:716
Increase, cell proliferation (hepatocytes)
AOP:43Disruption of VEGFR Signaling Leading to Developmental DefectsUnclassifiedWPHA/WNT Endorsed0.2KE:1001
Increased, Developmental Defects
AOP:107Constitutive androstane receptor activation leading to hepatocellular adenomas and carcinomas in the mouse and the ratCancer; Gastrointestinal System DiseaseUnder Review0.6KE:719
Increase, hepatocellular adenomas and carcinomas
KE:1214
Altered gene expression specific to CAR activation, Hepatocytes
KE:716
Increase, cell proliferation (hepatocytes)
AOP:108Inhibition of pyruvate dehydrogenase kinase leading to hepatocellular adenomas and carcinomas (in mouse and rat)Cancer; Gastrointestinal System Disease-0.33KE:768
Increase, Cytotoxicity
KE:719
Increase, hepatocellular adenomas and carcinomas
AOP:117Androgen receptor activation leading to hepatocellular adenomas and carcinomas (in mouse and rat)Cancer; Gastrointestinal System DiseaseUnder Development0.5KE:719
Increase, hepatocellular adenomas and carcinomas
KE:716
Increase, cell proliferation (hepatocytes)
AOP:118Chronic cytotoxicity leading to hepatocellular adenomas and carcinomas (in mouse and rat)Cancer; Gastrointestinal System Disease-0.25KE:719
Increase, hepatocellular adenomas and carcinomas
AOP:139Alkylation of DNA leading to cancer 1Cancer-0.25KE:885
Increase, Cancer
AOP:220Cyp2E1 Activation Leading to Liver CancerCancer; Gastrointestinal System DiseaseWPHA/WNT Endorsed0.2KE:1395
Liver Cancer
AOP:463The AOP framwork on silica nanopariticles induced hepatoxicityGastrointestinal System Disease-0.09KE:2034
liver dysfunction
AOP:474Succinate dehydrogenase inactivation leads to cancer by promoting EMTCancerUnder Development0.2KE:885
Increase, Cancer
AOP:504SULT1E1 inhibition leading to uterine adenocarcinoma via increased estrogen availability at target organ levelUnclassified-0.33KE:1065
Activation, estrogen receptor alpha
AOP:505Reactive Oxygen Species (ROS) formation leads to cancer via inflammation pathwayCancer-0.2KE:885
Increase, Cancer
AOP:513Reactive Oxygen (ROS) formation leads to cancer via Peroxisome proliferation-activated receptor (PPAR) pathwayCancer-0.2KE:885
Increase, Cancer
AOP:534Succinate dehydrogenase (SDH) inhibition leads to cancer through oxidative stressCancer-0.17KE:885
Increase, Cancer
AOP:546Succinate dehydrogenase inactivation leads to cancer through hypoxic-like mechanismsCancer-0.2KE:885
Increase, Cancer
AOP:561Aromatase induction leading to estrogen receptor alpha activation via increased estradiolUnclassified-0.2KE:1065
Activation, estrogen receptor alpha

Associated AOPs with Level of Relevance 3
AOPs with at least 1 MIE associated with chemical, and no associated AO
AOP Identifier AOP Title AO Classification OECD Status Coverage Score KE Identifier KE Name
AOP:19Androgen receptor antagonism leading to adverse effects in the male foetus (mammals)Reproductive System Disease-0.2KE:26
Antagonism, Androgen receptor
AOP:21Aryl hydrocarbon receptor activation leading to early life stage mortality, via increased COX-2UnclassifiedWPHA/WNT Endorsed0.2KE:18
Activation, AhR
AOP:41Sustained AhR Activation leading to Rodent Liver TumoursCancer; Gastrointestinal System DiseaseUnder Review0.2KE:165
Activation, Long term AHR receptor driven direct and indirect gene expression changes
AOP:111Decrease in androgen receptor activity leading to Leydig cell tumors (in rat)Cancer; Reproductive System Disease-0.2KE:1614
Decrease, androgen receptor activation
AOP:123Unknown MIE leading to reproductive dysfunction via increased HIF-1alpha transcriptionUnclassified-0.27KE:799
Increased, HIF-1 heterodimer
KE:801
modulation, Unknown
KE:802
Increased, HIF-1 alpha transcription
AOP:128Kidney dysfunction by decreased thyroid hormoneUrinary System DiseaseUnder Development0.09KE:277
Thyroid hormone synthesis, Decreased
AOP:131Aryl hydrocarbon receptor activation leading to uroporphyriaInherited Metabolic DisorderWPHA/WNT Endorsed0.33KE:18
Activation, AhR
KE:850
Induction, CYP1A2/CYP1A5
AOP:150Aryl hydrocarbon receptor activation leading to early life stage mortality, via reduced VEGFUnclassifiedWPHA/WNT Endorsed0.14KE:18
Activation, AhR
AOP:151AhR activation leading to preeclampsiaCardiovascular System DiseaseUnder Development0.14KE:18
Activation, AhR
AOP:155Deiodinase 2 inhibition leading to increased mortality via reduced posterior swim bladder inflationUnclassifiedWPHA/WNT Endorsed0.17KE:1002
Inhibition, Deiodinase 2
AOP:156Deiodinase 2 inhibition leading to increased mortality via reduced anterior swim bladder inflationUnclassifiedWPHA/WNT Endorsed0.17KE:1002
Inhibition, Deiodinase 2
AOP:167Early-life estrogen receptor activity leading to endometrial carcinoma in the mouse.Reproductive System Disease; Cancer-0.29KE:1064
prepubertal increase, Estrogen receptor (ER) activity
KE:1065
Activation, estrogen receptor alpha
AOP:188Iodotyrosine deiodinase (IYD) inhibition leading to altered amphibian metamorphosisUnclassified-0.4KE:277
Thyroid hormone synthesis, Decreased
KE:1152
Inhibition, Iodotyrosine deiodinase (IYD)
AOP:190Type II iodothyronine deiodinase (DIO2) inhibition leading to altered amphibian metamorphosisUnclassified-0.17KE:1002
Inhibition, Deiodinase 2
AOP:191Type III iodotyrosine deiodinase (DIO3) inhibition leading to altered amphibian metamorphosisUnclassified-0.25KE:1153
Inhibition, Deiodinase 3
AOP:212Histone deacetylase inhibition leading to testicular atrophyReproductive System DiseaseWPHA/WNT Endorsed0.33KE:1502
Histone deacetylase inhibition
KE:1505
Cell cycle, disrupted
AOP:269Elevated ATP demand for detoxification and repair mechanisms leading to impaired growth and developmentUnclassified-0.17KE:10008
Increased transcription for detoxification and repair mechanism
AOP:270Elevated ATP demand for detoxification and repair mechanisms leading to impaired locomotor activityUnclassified-0.12KE:10008
Increased transcription for detoxification and repair mechanism
AOP:275Histone deacetylase inhibition leads to neural tube defectsNeural Tube Defect-0.2KE:1502
Histone deacetylase inhibition
AOP:306Androgen receptor (AR) antagonism leading to short anogenital distance (AGD) in male (mammalian) offspringUnclassifiedUnder Development0.5KE:1614
Decrease, androgen receptor activation
KE:26
Antagonism, Androgen receptor
AOP:310Embryonic Activation of the AHR leading to Reproductive failure, via epigenetic down-regulation of GnRHRUnclassified-0.08KE:18
Activation, AhR
AOP:314Binding to estrogen receptor (ER)-α in immune cells leading to exacerbation of systemic lupus erythematosus (SLE)Immune System Disease; Musculoskeletal System DiseaseUnder Development0.2KE:1710
Binding to estrogen receptor (ER)-α in immune cells
AOP:344Androgen receptor (AR) antagonism leading to nipple retention (NR) in male (mammalian) offspringUnclassifiedUnder Development0.5KE:1614
Decrease, androgen receptor activation
KE:26
Antagonism, Androgen receptor
AOP:345Androgen receptor (AR) antagonism leading to decreased fertility in femalesEndocrine System Disease; Reproductive System Disease; Reproductive System DiseaseUnder Development0.33KE:1614
Decrease, androgen receptor activation
KE:26
Antagonism, Androgen receptor
AOP:372Androgen receptor antagonism leading to testicular cancerEndocrine System Disease; Reproductive System Disease; Cancer-0.4KE:1614
Decrease, androgen receptor activation
KE:26
Antagonism, Androgen receptor
AOP:414Aryl hydrocarbon receptor activation leading to lung fibrosis through TGF-β dependent fibrosis toxicity pathwayMusculoskeletal System Disease; Respiratory System Disease-0.2KE:18
Activation, AhR
AOP:415Aryl hydrocarbon receptor activation leading to lung fibrosis through IL-6 toxicity pathwayMusculoskeletal System Disease; Respiratory System Disease-0.2KE:18
Activation, AhR
AOP:416Aryl hydrocarbon receptor activation leading to lung cancer through IL-6 toxicity pathwayCancer-0.33KE:18
Activation, AhR
KE:1669
Increased, DNA damage and mutation
AOP:417Aryl hydrocarbon receptor activation leading to lung cancer through AHR-ARNT toxicity pathwayCancer-0.4KE:18
Activation, AhR
KE:1669
Increased, DNA damage and mutation
AOP:418Aryl hydrocarbon receptor activation leading to impaired lung function through AHR-ARNT toxicity pathwayRespiratory System Disease-0.2KE:18
Activation, AhR
AOP:419Aryl hydrocarbon receptor activation leading to impaired lung function through P53 toxicity pathwayRespiratory System Disease-0.5KE:18
Activation, AhR
KE:1923
Altered gene expression, P53 dependent apoptosis pathway
AOP:420Aryl hydrocarbon receptor activation leading to lung cancer through sustained NRF2 toxicity pathwayCancer-0.5KE:18
Activation, AhR
KE:1917
Altered gene expression, NRF2 dependent antioxidant pathway
AOP:439Activation of the AhR leading to metastatic breast cancerThoracic Disease; CancerUnder Development0.22KE:18
Activation, AhR
KE:1971
Increased, tumor growth
AOP:443DNA damage and mutations leading to Metastatic Breast CancerThoracic Disease; CancerUnder Development0.2KE:1669
Increased, DNA damage and mutation
KE:1554
Increase Chromosomal Aberrations
AOP:445Estrogen Receptor Alpha Agonism leads to Impaired ReproductionReproductive System Disease-0.12KE:1065
Activation, estrogen receptor alpha
AOP:447Kidney failure induced by inhibition of mitochondrial electron transfer chain through apoptosis, inflammation and oxidative stress pathwaysUrinary System Disease-0.17KE:1917
Altered gene expression, NRF2 dependent antioxidant pathway
KE:1770
Decrease, Mitochondrial membrane potential
AOP:456Aryl hydrocarbon receptor activation leading to early life stage mortality via sox9 repression induced cardiovascular toxicityUnclassifiedUnder Review0.17KE:18
Activation, AhR
AOP:458AhR activation in the liver leading to Subsequent Adverse Neurodevelopmental Outcomes in MammalsCognitive Disorder-0.12KE:18
Activation, AhR
AOP:459AhR activation in the thyroid leading to Subsequent Adverse Neurodevelopmental Outcomes in MammalsCognitive Disorder-0.33KE:18
Activation, AhR
KE:277
Thyroid hormone synthesis, Decreased
KE:850
Induction, CYP1A2/CYP1A5
AOP:477Androgen receptor (AR) antagonism leading to hypospadias in male (mammalian) offspringPhysical Disorder-0.67KE:1614
Decrease, androgen receptor activation
KE:26
Antagonism, Androgen receptor
AOP:493ERa inactivation alters AT expansion and functions and leads to insulin resistance and metabolically unhealthy obesityAcquired Metabolic Disease-0.1KE:2126
Estrogen receptor alpha inactivation
AOP:494AhR activation leading to liver fibrosisGastrointestinal System Disease-0.17KE:18
Activation, AhR
AOP:497ERa inactivation alters mitochondrial functions and insulin signalling in skeletal muscle and leads to insulin resistance and metabolic syndromeInherited Metabolic Disorder; Disease Of Metabolism-0.12KE:2126
Estrogen receptor alpha inactivation
AOP:503Activation of uterine estrogen receptor-alfa leading to endometrial adenocarcinoma, via epigenetic modulationReproductive System Disease; CancerUnder Review0.17KE:1065
Activation, estrogen receptor alpha
AOP:536Estrogen receptor agonism leading to reduced survival and population growth due to renal failureUnclassified-0.17KE:111
Agonism, Estrogen receptor
AOP:537Estrogen receptor agonism leads to reduced fecundity via increased vitellogenin in the liverUnclassified-0.2KE:111
Agonism, Estrogen receptor
AOP:563Aryl hydrocarbon Receptor (AHR) activation causes Premature Ovarian Insufficiency via Bax mediated apoptosisReproductive System Disease; Endocrine System Disease-0.17KE:18
Activation, AhR

Associated AOPs with Level of Relevance 5
AOPs with at least 1 MIE and AO associated with chemical, and there exists a directed path between that MIE and AO
AOP Identifier AOP Title AO Classification OECD Status Coverage Score KE Identifier KE Name
AOP:274Histone deacetylase inhibition leads to impeded craniofacial developmentMusculoskeletal System Disease-0.5KE:1559
Facial cartilage structures are reduced in size and morphologically distorted
KE:1502
Histone deacetylase inhibition
AOP:455Aryl hydrocarbon receptor activation leading to early life stage mortality via sox9 repression induced impeded craniofacial developmentMusculoskeletal System DiseaseUnder Review0.33KE:18
Activation, AhR
KE:1559
Facial cartilage structures are reduced in size and morphologically distorted
Glossary of Terms

AOP
Adverse Outcome Pathway
MIE
Molecular Initiating Event
KE
Key Event
AO
Adverse Outcome
Coverage score
The fraction of KEs within the AOP, that are mapped to the chemical-associated toxicological endpoints
Level of relevance
Qualitative rank based on the kind of associated KEs within the corresponding AOP
AO classification
The disease category corresponding to the AO in the AOP obtained from Disease Ontology
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DISCLAIMER

TICToK is a knowledgebase of chemicals found in tattoo inks, compiled from publicly available regulatory and scientific resources. The chemical classifications presented in this knowledgebase are derived from multiple publicly available resources and are provided solely for informational purposes, and they are neither authoritative nor binding. The chemical-AOP mappings compiled in this knowledgebase serve as plausible hypotheses for research, and further experimental validation is required to definitively establish these potential toxicity mechanisms. The authors bear no responsibility for any errors, omissions, or inconsistencies originating from these external sources. Users are advised to exercise independent judgment when interpreting chemical classifications and any other data provided in this resource. Importantly, our sole goal to build this resource on tattoo ink chemicals is to enable future basic research on this topic, and it does not necessarily reflect the views or objectives of our employers or funders.