HOW GOOD ARE VALIDATED METHODS TO PREDICT TOXICITY OF DIFFERENT TYPES OF SUBSTANCES AND PRODUCTS?
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1 HOW GOOD ARE VALIDATED METHODS TO PREDICT TOXICITY OF DIFFERENT TYPES OF SUBSTANCES AND PRODUCTS? VERA ROGIERS Dept. Toxicology Vrije Universiteit Brussel Brussels, Belgium
2 LAYOUT OF THE TALK CURRENT STATUS OF VALIDATED ALTERNATIVES LIMITATIONS OF AVAILABLE VALIDATED ALTERNATIVES ❶ ❷ ❸ ❹ Murine Local Lymph Node Assay 3T3 Neutral Red Uptake Phototoxicity test Embryonal Stem Cell Test EPISKIN in vitro test for skin irritation testing LACKING ALTERNATIVES CONCLUSIONS
3 LAYOUT OF THE TALK CURRENT STATUS OF VALIDATED ALTERNATIVES LIMITATIONS OF AVAILABLE VALIDATED ALTERNATIVES ❶ ❷ ❸ ❹ Murine Local Lymph Node Assay 3T3 Neutral Red Uptake Phototoxicity test Embryonal Stem Cell Test EPISKIN in vitro test for skin irritation testing LACKING ALTERNATIVES CONCLUSIONS
4 CURRENT STATUS WHAT VALIDATED 3R-ALTERNATIVES DO WE ACTUALLY HAVE? ACUTE ORAL TOXICITY SKIN CORROSIVITY SKIN IRRITATION SKIN SENSITISATION EYE IRRITATION PHOTOTOXICITY DERMAL ABSORPTION MUTAGENICITY EMBRYOTOXICITY Fixed dose Acute toxic class Up-and-down TER, EPISKIN TM, EpiDerm TM EPISKIN TM LLNA (rllna) screening test for severe or strong irritants 3T3 NRU PT In vitro (human / pig) Ames In vitro mammalian cell mutation In vitro micronucleus In vitro mammalian chromosome aberration WEC, MM, EST ADDRESSING HAZARD IDENTIFICATION FOR ACUTE AND LOCAL TOXICITY
5 LAYOUT OF THE TALK CURRENT STATUS OF VALIDATED ALTERNATIVES LIMITATIONS OF AVAILABLE VALIDATED ALTERNATIVES ❶ ❷ ❸ ❹ Murine Local Lymph Node Assay 3T3 Neutral Red Uptake Phototoxicity test Embryonal Stem Cell Test EPISKIN in vitro test for skin irritation testing LACKING ALTERNATIVES CONCLUSIONS
6 AVAILABLE VALIDATED ALTERNATIVES ARE THE CURRENTLY AVAILABLE ALTERNATIVE METHODS SUITABLE FOR TESTING DIFFERENT COMPOUND CATEGORIES?
7 CURRENTLY AVAILABLE VALIDATED ALTERNATIVES: ❶ Murine Local Lymph Node Assay Contact Allergy Allergic Contact Dermatitis Basketter D., April 2007, VUB, Brussel
8 CURRENTLY AVAILABLE VALIDATED ALTERNATIVES: ❶ Murine Local Lymph Node Assay ACTUAL STATUS: 1992: OECD screening 1999: ICCVAM approval 2000: ESAC approval 2002: OECD : EC B.42 New developments: rllna (reduction) non-radioactive LLNA
9 ❶ Murine Local Lymph Node Assay ACTUAL STATUS: OECD 429 (2002), 67/548/EEC Annex V - B.42 (2004) EXPERIENCE GAINED: CURRENTLY AVAILABLE VALIDATED ALTERNATIVES: Non-LLNA Non-LLNA & LLNA Only LLNA CHEMICALS* 4573 compounds in database compounds compounds COSMETICS** 176 compounds in database < compounds compound < compounds compounds EXAMPLE OF A WELL-DEVELOPED ALTERNATIVE? BUT STILL FOLLOW-UP NEEDED (Basketter D., epaa Lyon, 1-2/10/2007) * ECB data (new chemicals database), presented by Jens Linge, epaa Lyon, 1-2/10/2007 ** Databank compiling publicly available data SCCP opinions, Pauwels M & Rogiers V, Vrije Universiteit Brussel
10 CURRENTLY AVAILABLE VALIDATED ALTERNATIVES: ❶ Murine Local Lymph Node Assay EXPERIENCE GAINED: Similar Results Diverging Results COSMETICS** 23 compounds in database with LLNA and MK-test unreliable MK-test due to staining ** Databank compiling publicly available data SCCP opinions, Pauwels M & Rogiers V, Vrije Universiteit Brussel
11 ❷ 3T3 Neutral Red Uptake Phototoxicity test CURRENTLY AVAILABLE VALIDATED ALTERNATIVES:
12 CURRENTLY AVAILABLE VALIDATED ALTERNATIVES: ❷ 3T3 Neutral Red Uptake Phototoxicity test ACTUAL STATUS: in 2004: OECD 432 in 2000: EC B.41 EXPERIENCE GAINED: for chemicals for UV filters (cosmetics) for pharmaceuticals (De Smet A., J&J, epaa, Brussels, 5/11/2007) PROBLEMS Technically- and regulatory-based solubility, ph, bioavailability, UV-source, concentrations, complex mixtures, protocols FALSE POSITIVES LOST COMPOUNDS EXTRA TESTING in human 3D skin equivalent (Liebsch et al. 1995) NOT YET VALIDATED BUT USED BY INDUSTRY
13 CURRENTLY AVAILABLE VALIDATED ALTERNATIVES: Embryonal Stem Cell Test Marquardt et al., Toxicology (1999) - Discussions about predictivity - Proposal to be used as screening tool
14 CURRENTLY AVAILABLE VALIDATED ALTERNATIVES: ❸ Embryonal Stem Cell Test ACTUAL STATUS: ESAC approval (2001) Regulatory refusal (???) EXPERIENCE GAINED: for chemicals (Spielmann et al. ZEBET) for cosmetics: not accepted by SCCP? for pharmaceuticals : or?? discussions about predictivity Review on the implementation of the EST Workshop 5/5/2008, Frankfurt EST NOT SCIENTIFICALLY READY FOR REGULATORY ACCEPTANCE
15 ❹ EPISKIN in vitro test for skin irritation testing CURRENTLY AVAILABLE VALIDATED ALTERNATIVES:
16 CURRENTLY AVAILABLE VALIDATED ALTERNATIVES: ❹ EPISKIN in vitro test for skin irritation testing ACTUAL STATUS: ESAC approval (2007) as a stand-alone with MTT reduction as endpoint (optional is IL-1α) EXPERIENCE GAINED: for chemicals - 60 chemicals on reference list - in-house data (coded)? for cosmetics - only 1 chemical on Annexes 76/768/EEC - no data on hair dyes/colourants CONCERNS ABOUT MTT-REDUCTION AS ENDPOINT AND BARRIER FUNCTION OF IN VITRO MODEL Toxicol in vitro 21, 2007
17 CURRENTLY AVAILABLE VALIDATED ALTERNATIVES: ❹ EPISKIN in vitro test for skin irritation testing EXPERIENCE GAINED:? for cosmetics In vivo skin irritation data extracted from SCC(NF)P opinions ( )* COSMETICS* 176 compounds in database In vivo skin irritation data available 112 compounds Results Indecisive: 1 Non-irritating: 75 Slightly/mildly irritating: 23 Irritating: 11 Severely irritating: 1 Corrosive: 1 18 of the 112 compounds provoked discolouration of skin (hair dyes), in one case scoring became impossible due to discolouration * Databank compiling publicly available data SCCP opinions, Pauwels M & Rogiers V, Vrije Universiteit Brussel
18 CURRENTLY AVAILABLE VALIDATED ALTERNATIVES: ❹ EPISKIN in vitro test for skin irritation testing EXPERIENCE GAINED:? for cosmetics In vivo skin irritation data extracted from SCC(NF)P opinions ( )* COSMETICS* 176 compounds in database In vivo skin irritation data available 112 compounds Results Indecisive: 1 Non-irritating: 75 Slightly/mildly irritating: 23 Irritating: 11 Severely irritating: 1 Corrosive: 1 POTENTIAL BASIS FOR INGREDIENT SELECTION FOR ADDITIONAL STUDY TO SUPPORT AVAILABLE DATA * Databank compiling publicly available data SCCP opinions, Pauwels M & Rogiers V, Vrije Universiteit Brussel
19 LAYOUT OF THE TALK CURRENT STATUS OF VALIDATED ALTERNATIVES LIMITATIONS OF AVAILABLE VALIDATED ALTERNATIVES ❶ ❷ ❸ ❹ Murine Local Lymph Node Assay 3T3 Neutral Red Uptake Phototoxicity test Embryonal Stem Cell Test EPISKIN in vitro test for skin irritation testing LACKING ALTERNATIVES CONCLUSIONS
20 LACKING ALTERNATIVES WHICH ALTERNATIVES ARE LACKING ( )? Acute dermal toxicity Acute inhalation toxicity Eye irritation Photoallergy Subacute and subchronic toxicity Chronic toxicity Target organ and systemic toxicity (Non-genotoxic) carcinogenicity Biokinetics LACK OF ALTERNATIVES FOR SYSTEMIC AND LONG-TERM TOXICITY TESTING PROBLEM FOR QUANTITATIVE RISK CHARACTERISATION, IN PARTICULAR FOR COSMETICS (testing & marketing ban)
21 LAYOUT OF THE TALK CURRENT STATUS OF VALIDATED ALTERNATIVES LIMITATIONS OF AVAILABLE VALIDATED ALTERNATIVES ❶ ❷ ❸ ❹ Murine Local Lymph Node Assay 3T3 Neutral Red Uptake Phototoxicity test Embryonal Stem Cell Test EPISKIN in vitro test for skin irritation testing LACKING ALTERNATIVES CONCLUSIONS
22 CONCLUSIONS 3R-VALIDATED ALTERNATIVE METHODS: HAZARD IDENTIFICATION OF LOCAL AND SHORT-TERM TOXICITY REFINEMENT AND FOLLOW-UP ARE URGENTLY NEEDED APPLICABILITY IN DIFFERENT FIELDS REMAINS AN OPEN QUESTION LACK OF 3R-ALTERNATIVES FOR SYSTEMIC AND LONG-TERM TOXICITY PROBLEM FOR QUANTITATIVE RISK ASSESSMENT OF NEW COMPOUNDS BASIC RESEARCH IS NEEDED (MORE THAN EVER) TO BUILD A SOLID BASIS FOR THE MORE DIFFICULT PROBLEMS
23 CONCLUSIONS LESSONS TO BE LEARNED STOP OVERSELLING ALTERNATIVE METHODS AND RAISING OF NON-REALISTIC EXPECTATIONS GAIN TRUST OF REGULATORY BODIES FOR ALTERNATIVES BY FOLLOW-UP AND CORRECT REPORTING INCORPORATE RESULTS OF REAL WORLD INTO 3R-ALTERNATIVES TO COME TO USEFUL TESTS FOR DIFFERENT TYPES OF COMPOUNDS FOCUS ON PRIORITISATION OF THE REAL NEEDS
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