Luděk Bláha, PřF MU, RECETOX www.recetox.cz BIOMARKERS AND TOXICITY MECHANISMS 11 – BIOMARKERS of EXPOSURE and SUSCEPTIBILITY.

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Luděk Bláha, PřF MU, RECETOX BIOMARKERS AND TOXICITY MECHANISMS 11 – BIOMARKERS of EXPOSURE and SUSCEPTIBILITY

Biomarkers of Exposure Biomarkers of internal and effective dose depends on toxicokinetics Biomarkers of internal dose (short / long term) – examples: Cd in urine, DDE in fat tissues - should be easy to sample (urine, breath) - instrumental analytical methods (analyses of toxicant) Biomarkers of effective dose - the chemical interacted with the biological target  analyses of ADDUCTS Two types of adducts: selective and non-selective

SELECTIVE ADDUCTS OF TOXICANTS with BIOMOLECULES SELECTIVE = CHEMICAL-SPECIFIC Adducts with DNA styrene-oxide-O6-guanine N7-guanyl-aflatoxin B1 Hemoglobin-pesticides adduct Methods of analyses: - analytical chemistry - extraction from biological sample - chemical determination by HPLC or GC

– binding with macromolecules (DNA, proteins) with no further information on the structure of actual adduct (i.e. causative agent not clear) Typical nonselective biomarker methods - 32 P-postlabelling assay - DNA-strand breaks - comet assay - identification of oxidized DNA: 8-hydroxy-2´-deoxyguanosine Non-selective adducts

32 P-postlabelling assay principle Digestion of NA Enzymatic labelling with 32P (kinase) TLC or HPLC analyses of products TLC result (thin layer chromatography) A = various adducts B - controls

Comet assay - principle

Example results - Comet assay vs. radiation

8-hydroxy-2´-deoxyguanosine analysis Oxidative damage to DNA - many causes  8-OH-dG is the most common marker of DNA oxidation Analysis: analytical chemistry methods - HPLC - immunochemistry (ELISA)

PAH-DNA adducts * often high variability * may have difficult interpretation Occup. exposure (Low / Intermed. / High) Occupational Non-exposed (NS) vs. Exposed (S)

Biomarkers of susceptibility

Toxicokinetics determines susceptibility of an individual at various levels  Biomarkers of susceptibility Will the individual be sensitive? Will patient respond to a drug?

Importance of susceptibility biomarkers

Biomarkers of susceptibility Susceptibility depends on genotype and metabolism - genetic polymorphism in detoxification enzymes - variability in specific isoenzymes  susceptibility to „activate“ toxicants: example: N-acetylation of arylamines – NAT2  susceptibility to genotoxins  family cancers  susceptibility to drugs (including anticancer drugs)

Example: genetic polymorphism SNPs - single nucleotide polymorphism SNPs  affects protein functions  in specific cases (see example) some SNPs identified  PERSONALIZED MEDICINE To identify SNP as a biomarker Many genotypes (from many individuals) must be sequenced and compared with phenotype (e.g. responsiveness to certain drug)

Cyclophosphamide (anticancer drug) and its toxicity Genetic polymorphism

Example: genetic polymorphism Alleles known to be involved in polymorphism

Personalized medicine SNP diagnostics: 1) DNA isolation 2) Multiplication of specific gene eg. CYP 3) SNP identification... Molecular biology methods such as * NA sequencing * Probe pairing... number of variants