Non-mammalian animal models in developmental toxicology. Dr. Michael Oelgeschläger
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1 FEDERAL INSTITUTE FOR RISK ASSESSMENT Non-mammalian animal models in developmental toxicology Dr. Michael Oelgeschläger
2 Nick Hobgood, wikipedia Emergence of animal models in experimental developmental biology André Karwath, wikipedia G. Streisinger Brachydanio rerio H. Driesch Sea urchin T.H. Morgan D. melanogaster Hamburger Hamilton Gallus gallus D. melanogaster Screen W. Roux Rana esculenta E. Browne Hydra H. Spemann Triturus vulgaris Nieuwkoop Faber Xenopus laevis S. Brenner Caenorhabditis elegans Grand-Duc, Wikipedia Benutzer:Grand-Duc Frank Fox Christian Fischer, wikipedia Zeynep F. Altun, Boston/ Tübingen Screen (D. rerio) Dr. Michael Oelgeschläger, , International Symposium on Developmental Toxicity Page 2
3 Advantages of the various model systems C. elegans D. melanogaster Xenopus Zebrafish Chicken Mouse Number of Eggs ± 300 ± 100 > 1000 ± Embryo accessibility / - Generation time Very short Very short X.l. Long X.t. Medium Medium Medium Mediu m Genome known Yes Yes Yes Yes Yes Yes Genetics Gain-of function (+/-) Loss-of-function (+/-) Micromanipulation + /- +/ /- ES cells available No No No No Yes Yes HTS Costs Low Low Low Low Medium High Evolutionary distance High High Medium Medium Medium Close Dr. Michael Oelgeschläger, , International Symposium on Developmental Toxicity Page 3
4 Comparison of animal models reveal a high degree of evolutionary conservation 1. Transcription regulation of cell fate determination and positional information Highly conserved Hox gene clusters with highly similar genomic organisation and biological functions have been identified in species throughout the animal kingdom Mutation of Pax6 causes aniridia in humans and an eyeless phenotype in mouse or fly. Transgenic mouse Pax6 can induce the formation of ectopic compound eyes in fly 2. Control of early embryonic patterning by conserved signalling pathways Role of various key signalling pathways first identified in fly were found to regulate comparable processes in mammals BMP: inhibition of neural cell fate WNT: inhibits foforebrain formation Dr. Michael Oelgeschläger, , International Symposium on Developmental Toxicity Page 4
5 Comparison of animal models reveal a high degree of evolutionary conservation 3. Limb development Highly conserved in vertebrates: Apical Ectodermal Ridge expressing Fgf (outgrowth) e.g. Thalidomid Inhibits limb /fin outgrowth in chicken / zebrafish Target (CRBN) identified using chicken and zebrafish embryos as functional readout Relevance of the regulation of CRBN by Thalidomid verified in human cells (regulation of Ikarus in myelomas) co Zone of Polarising Activity expressing Shh (AP axis) Thal Ito et al Science 327: Dr. Michael Oelgeschläger, , International Symposium on Developmental Toxicity Page 5
6 1. Drosophila melanogaster Genetics (various mutant and transgenic strains available) High similarity between genes regulating embryogenesis in fly and vertebrates Identification of genes related to human disease (drug discovery) High Evolutionary Distance Sex-linked Recessive Lethal (SLRL) genotoxicity test: TG 477 Somatic Mutation And Recombination Test (SMART) Teratogenicity testing performed applying various protocols Problems: false negatives evolutionary distance HTS capacity: automated embryo sorting followed by imaging Dr. Michael Oelgeschläger, , International Symposium on Developmental Toxicity Page 6
7 2. Caenorhabditis elegans Highly defined cell lineages Conserved molecular mechanisms and signalling pathways Basic mechanism of apoptosis discovered in C. elegans genetic screens gain- or loss-of-function studies (transgenic approaches, interfering RNA) various mutant and transgenic lines available High Evolutionary Distance Common use. neurobiology (Alzheimer, Parkinson) ageing drug screening Proposed for studies on developmental / neurotoxicity Dr. Michael Oelgeschläger, , International Symposium on Developmental Toxicity Page 7
8 3. Chicken Highly conserved molecular mechanisms and signaling pathways microsurgical procedures possible local exposure using beads gain- / loss-of-function studies (viral transduction, in ovo electroporation) Medium Evolutionary Distance Avian Reproduction Test: OECD TG 206 Chick Embryotoxicity Screening Test (CHEST) Problems : false positive rate, route of exposure, maternal <=> embryonal toxicity Dr. Michael Oelgeschläger, , International Symposium on Developmental Toxicity Page 8
9 4. Xenopus laevis Highly conserved molecular mechanisms and signalling pathways (BMP, Wnt) > 1000 eggs /female / day microinjection of RNA, DNA, Morpholinos or Protein in single blastomere detailed fate map available micromanipulations, incl. explant culture (animal caps) possible Medium Evolutionary Distance Amphibian metamorphosis assay (AMA): TG 231 Frog Embryo Larval Amphibian Growth and Development Assay (LAGDA) Transgenic approaches to determine effects on thyroid hormone activity Frog Embryo Teratogenesis Assay (FETAX) Problems: equivocal results embryotoxicity <=> maternal toxicity Dr. Michael Oelgeschläger, , International Symposium on Developmental Toxicity Page 9
10 4. Xenopus laevis A number of large scale screens already successfully performed for chemicals affecting: pigmentation angiogenesis heterotaxia / TGFß-inhibition signalling pathways (e.g. Wnt pathway) Microinjection of Morpholino, RNA mutant embryo Chemical library single compound or pools Identification of active compound Target identification & characterisation Verification in mammalian model system Dr. Michael Oelgeschläger, , International Symposium on Developmental Toxicity Page 10
11 5. Zebrafish Embryonic patterning (Boston/ Tübingen screen) Highly conserved molecular mechanisms and signalling pathways Especially suited for: (genetic) screens gain- or loss-of-function studies (microinjection RNA/ Morpholinos) various mutant and transgenic lines available Medium Evolutionary Distance Fish Embryo Acute Toxicity (FET) Test: OECD TG 236 Fish Sexual Development Test (FSDT): OECD TG 234 Fish, 21 Day Assay (FA): OECD TG 230 Fish, Short Term Reproduction Assay (FSTRA): OECD TG 229 Fish, Short-term Toxicity Test on Embryo and Sac-fry Stages: OECD TG 212 Fish, Early-life Stage Toxicity Test: OECD TG 210 Dr. Michael Oelgeschläger, , International Symposium on Developmental Toxicity Page 11
12 5. Zebrafish Various HT screens successfully performed, using wild-type, mutant and transgenic lines or morpholino knockdown: Cancer Cardiovascular disease Neurodegenerative diseases Drug-induced toxicity Reporter lines for developmental toxicity screening Mutant strain or Microinjection of microinjection Morpholino, RNAof Morpholino mutant embryo Chemical library single compound or pools Early patterning (dharma, Wnt8) Neurogenesis (ngn) Angiogenesis (fli-1, flk-1) Myogenesis (mhc) Identification of active compound Target identification & characterisation Verification in mammalian model system Dr. Michael Oelgeschläger, , International Symposium on Developmental Toxicity Page 12
13 5. Zebrafish Developmental toxicity assays Padilla et al (2012) Toxicology 22: ToxCast chemicals 62 % toxicity (191) Concentration: 80mM to 1nM Exposure: hpf 6 endpoints Gustafson et al (2012) Reproductive Toxicology 33: chemicals blind study (4 Labs) Concentration: 1000 µm to 1µM Exposure: hpf 10 endpoints Truong et al. (2012) Toxicological Sciences 137: ToxCast chemicals 46% toxicity (487) Concentration: 640 µm to µm Exposure: 6 to 120 hpf 18 endpoints Selderslaghs et al (2012) Reproductive Toxicology 33: chemicals Concentration ranges determined in preliminary experiments for each compound (1µM 162 mm) Exposure: hpf 11 endpoints Dr. Michael Oelgeschläger, , International Symposium on Developmental Toxicity Page 13
14 Potential problems using non-mammalian models (inter-)laboratory reproducibility (dep. on the complexity of the assay) Species differences Phenotype? Molecular mechanism? Transcriptomics Proteomics Metabolomics Exposure Toxicokinetics / Toxicodynamics Relevance of test substance concentration Applicability domain Number of substances tested that can be compared with reliable mammalian / human data Dr. Michael Oelgeschläger, , International Symposium on Developmental Toxicity Page 14
15 Use of non-mammalian models for the identification of conserved (specific) toxicity pathways Screening for phenotypic effects of compounds or mixtures transgenic reporter lines sensitized mutants HT- HC screening to identify the key pathways involved in mediating toxicity use of the various distinct experimental advantages, including irna, morpholino knock down, micromanipulations, mutant and transgenic lines use of mutant or transgenic strains or knock-down technologies to verify the relevance of potential (specific) mediators of toxicity identifies in omics studies Identification of conserved toxicity and adverse outcome pathways Establishment of novel (non - mammalian) assays Identification of new predictive endpoints for mammalian testing Dr. Michael Oelgeschläger, , International Symposium on Developmental Toxicity Page 15
16 FEDERAL INSTITUTE FOR RISK ASSESSMENT Thank you for your attention Dr. Michael Oelgeschläger Federal Institute for Risk Assessment Max-Dohrn-Str Berlin, GERMANY Tel Fax
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