Environmental APM Flashcards
phase I: bioactivation
oxidation, reduction, hydrolysis
metabolites are more polar, may activate inert compounds
CYP450 - heme/iron dependent
phase II: conjugation
metabolites are metabolically inactive, water-soluble, excreted through bile or urine
- glucoronidation (UGT)
- sulfonation (SULT)
- glutathione conjugation
- methylation
- amino acid conjugation
- acetylation
Gilbert’s syndrome SNP
UGT
Gilbert’s syndrome presentation
jaundice after fasting (due to inability to conjugate bilirubin with glucuronic acid)
which drug harder to metabolize in Gilbert’s
acetaminophen
food group that is supportive in Gilbert’s
cruciferous
body burden
quantity of exogenous substances or metabolites that accumulate in individual
enterohepatic recirculation
cycling of drugs, xenobiotics, metabolites after excretion into biliary system, which are then reabsorbed in intestine
does fasting impact phase I or II more?
phase II
it can decrease sulfonate and glucuronidation
lab tests to reveal toxicity
CBC - leukopenia, anemia
8-OH DG - indicates damaged DNA
blood lead, arsenic, cadmium, mercury
GGT (also AST, ALT) - xenobiotic exposure
lab measures of antioxidant status
GSH, GSH peroxidase, SOD RBC Zn, Mag, Se EFA coQ10 (total and reduced) retinol tocopherols
biomarkers of susceptibility in stool/GI
decreased diversity, dysbiosis, IP, elevated beta glucuronidase
lab measures of oxidative stress
8-OHDG TBARS ORAC - oxygen radical absorbance capacity lipid peroxides F2 isoprostanes oxLDL
testing for heavy metals
blood is best for recent exposure (4-6 weeks) or recent mobilization
blood and urine can both be used for acute or chronic
hair best used WITH blood and urine
heavy metal found in hair of those with ASD
Antimony, Lead, Mercury, Arsenic