Effects of Pharmaceutical Exposures Ian Wilson
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1 Effects of Pharmaceutical Exposures Ian Wilson Imperial College London
2 Questions Can pharmaceuticals (drugs) at therapeutic doses affect the gut microbiome? If yes, are there consequences for the host? Is there evidence that environmental drug exposures act directly on the human gut microbiome? What about the impact on human microbiomes of agricultural drug use? What about indirect effects?
3 Background The gut microbiomes provide the host with an important external organ with significant metabolic capacity and the microbiota that form it are not passengers but crew. Environmental factors exert a major influence in the development and evolution of an individuals microbiome. Initially the microbiome is derived from the mother but subsequent exposures to chemicals (including drugs) and environmental microoganisms can modify it. The presence of the gut microbiome has direct effects on the host and changes the hosts metabolic profile
4 What else affects the microbiome? Age Genetics Sex Diet Disease Etc. etc, all of which might represent confounding factors
5 How Does the Microbiome affect the Host Metabolic Phenotype? Proton NMR Spectrum of Normal Rat Urine ppm ppm
6 The Absence of a Microbiome Proton NMR Spectrum of Urine from a Germ-Free Rat Low aromatics and high formic acid compared to normal rats ppm ppm
7 So What Effect Does Host Genetics Have? Genetic differences reasonably might be expected to have effects on the composition of the microbiome? Examination of the fecal microbiome of a number of strains of mouse seems to show that different bacterial composition is associated with the different genetic backgrounds
8 Dice (Opt:0.50%) (Tol 1.3%-1.3%) (H>0.0% S>0.0%) [0.0%-100.0%] different mouse strains with scid 6 Different strains of mice 6 different microbiomes Friswell MK, PLoS ONE 5(1): e8584. doi: /journal.pone CD1 (1) CD1 (2) CD1 (3) CD1 (4) CD1 (5) GFEC (3) GFEC (4) GFEC (1) GFEC (2) C57 (2) C57 (3) C57 (1) CBA (1) CBA (2) CBA (4) CBA (5) CBA (6) CBA (3) C3H (1) C3H (2) C3H (3) SCID (1) SCID (2) SCID (3)
9 Strain vs Environmental Effects on the Microbiome The results for the different strains look fairly unequivocal but. What about the fact that they were brought up in different cages and had different mothers? Will these factors also affect the resulting microbiome (and the metabolic phenotype)?
10 Maternal vs Strain Effects on the Micobiome Pearson correlation [0.0%-100.0%] foster mum strains (2 genders) and 1 mother AG 3 (5) C57 4 (5) AG 2 (5) C57 1 (5) C57 6 (4) AG 5 (4) C57 4 (4) AG 2 (4) C57 1 (4) AG 3 (4) AG 5 (5) C57 6 (5) C57 1 (1) C57 4 (2) C57 6 (2) 0 AG 3 (1) AG 5 (2) AG 5 (1) C57 4 (1) C57 6 (1) BDF1. (1) AG 3 (2) C57 1 (2) AG 2 (1) AG 2 (2) AG 2 (3) C57 1 (3) AG 3 (3) C57 4 (3) C57 6 (3) AG 5 (3) C57 Agoutie Male Female SIMCA-P /10/ :59:16 R2X 0.822, Q2(cum) So, for mice, the maternal environment is more important than strain, and so is gender, Friswell MK, PLoS ONE 5(1): e8584. doi: /journal.pone
11 Age-Related Effects on Mice of Changing Environments For mice the environment is more important than the maternal environment Microbiome Pearson correlation [0.0%-100.0%] Moved mature mice (a) C3H 7 C (2) C3H 8 C (2) C3H 6 B (2) C3H 4 B (2) C3H 5 B (2) C3H 9 C (2) C3H 6 B (4) C3H 7 C (3) C3H 8 C (4) C3H 4 B (4) C3H 5 B (4) C3H 8 C (1) C3H 9 C (1) C3H 5 B (1) C3H 4 B (1) C3H 7 C (1) C3H 6 B (1) C3H 4 B (3) C3H 5 B (3) C3H 6 B (3) C3H 8 C (3) C3H 9 C (3) C3H 9 C (4) C3H 1 A (5) C3H 2 A (5) C3H 3 A (5) C3H 2 A (6) C3H 3 A (6) C3H 1 A (6) C3H 2 A (2) C3H 3 A (2) C3H 1 A (2) C3H 1 A (3) C3H 1 A (1) C3H 2 A (3) C3H 3 A (3) C3H 2 A (4) C3H 3 A (4) C3H 1 A (4) C3H 2 A (1) C3H 3 A (1) (b) Host metabolic phenotype SIMCA-P /08/ :10:06 The Metabolic Phenotype Reflects Microbiotype Friswell MK, PLoS ONE 5(1): e8584. doi: /journal.pone
12 The Environment and the Rat Microbiome 3 strains of Zucker rat: 3 animals, 1 of each strain, housed in each of 6 cages
13 Effects of Antibiotic s on the Rat 3 groups of rats 6 Control Rats 6 Antibiotic treated 8 days 6 Antibiotic treated - 4 days then allowed to recover Swann et al PNAS 2011 vol. 108 suppl
14 14 Swann et al PNAS 2011 vol. 108 suppl
15 Can Pharmaceuticals (drugs) at Therapeutic Doses Affect the Human Gut Microbiome? Antibiotics are obvious candidates. They can clearly directly affect the microbiomes Proton Pump Inhibitors (PPI s), their pharmacology changes the gut environment Non-steroidal anti-inflammatory drugs (NSAID s) can cause gut damage and this results in changes to the gut environment
16 Antibiotics: Effects On The Microbiome Jernberg et al, (2010)Long-term impacts of antibiotic exposure on the human intestinal microbiota, Microbiology, 156, (A REVIEW) Dethlefsen et al (2008) The pervasive effects of an antibiotic on the human gut microbiota, as revealed by deep 16S rrna sequencing. PLoS Biol 6(11): e280. Dethlefsen & Relman ( 2011) Incomplete recovery and individualized responses of the human distal gut microbiota to repeated antibiotic perturbation PNAS, 108, , suppl. 1
17 Effects of PPI s On The Microbiome Lo & Chan, (2013) Proton Pump Inhibitor Use and the Risk of Small Intestinal Bacterial Overgrowth: A Meta-analysis, Clin. Gastroenterology & Hepatology 11: Freedberg et al (2014) The impact of proton pump inhibitors on the human gastrointestinal microbiome, Clin Lab Med. 34, Marlicz et al (2014 ) Nonsteroidal Anti-inflammatory Drugs, Proton Pump Inhibitors, and Gastrointestinal Injury: Contrasting Interactions in the Stomach and Small Intestine, Mayo Clin Proc. 89, Imhann et al (2015) Proton pump inhibitors affect the gut microbiome, Gut;0:1 9.
18 Are There Consequences of Drug Induced Microbiome Changes for the Host? Antibiotics, Proton Pump Inhibitors (PPI s) and Non-steroidal anti-inflammatory drugs (NSAID s) have both short and long term effects on the microbiome. Probably ANY drug that acts on the gut microbiota, or directly or indirectly affects the physiology of the gut, has the potential to modify the microbiome.
19 What about environmental exposure to drugs? Environmental contamination of e.g., potable water by antibiotics is typically fairly low well below any likely major direct effects. However, local concentrations in waste water or effluent in some areas due to manufacturing waste do have concentration of antibiotics that exceed those expected in therapeutic use. Indirect effects are likely to be as a result of stimulating some level of antimicrobial resistance (AMR) giving some species an opportunistic advantage in colonizing the host Agricultural use probably represents a bigger source of affects on the gut microbiome through production of antibiotic-resistant strains
20 Agricultural use of Antibiotics THE UK REVIEW ON ANTIMICROBIAL RESISTANCE CHAIRED BY JIM O NEILL DECEMBER 2015 ANTIMICROBIALS IN AGRICULTURE AND THE ENVIRONMENT: REDUCING UNNECESSARY USE AND WASTE The Review on AMR, commissioned by the British Prime Minister, and hosted by the Wellcome Trust. It is tasked with recommending, by the summer of 2016, a comprehensive package of actions to tackle AMR globally. In the meantime, they are publishing a series of papers looking at individual aspects of the wider AMR problem.
21 THE UK REVIEW ON ANTIMICROBIAL RESISTANCE Of 139 academic studies the Review found, only seven (5%) argued that there was no link between antibiotic consumption in animals and resistance in humans, while 100 (72 %) found evidence of a link. According to the figures in this report 70% (8,893,103kg!) of the antibiotic use in the US is in agriculture compared to 30% for humans Of the 41 antimicrobials that were authorised for sale in animals, and sold in the US in 2012, 31 are currently deemed by the FDA to be important for human health.
22 Consequences The gut microbiome is an important organ of DRUG METABOLISM and can modify drug TOXICITY Changes in the composition of the microbiome could well modify how drugs are metabolised This might affect both efficacy and toxicity An example of this is seen for humans for acetaminophen where competition for sulfation between bacteriallyderived phenols and the drug alters the overall metabolic fate
23 Tyrosine to p-cresol sulfate Host metabolism of p-cresol to sulfate Microbiome metabolism of tyrosine to p-cresol 4-cresyl sulfate (4CS) Sulfation is a high specificity, but low capacity, preferred route of metabolism for phenols
24 Paracetamol/ acetaminophen Pre-dose 4-cresyl sulfate / creatinine Changes in 4-cresol production has the potential to impact on host xenobiotic metabolism via competition for sufation
25 When host sulfation and glucuronidation capacity begins to become limiting then other metabolic routs become more important with consequences for toxicity APAP
26 Drug-Microbiome Interactions Some Concluding Comments The gut microbiota represents both a major forgotten organ of drug metabolism, activating certain prodrugs, and a target for collateral damage from therapeutic use. Microbes produce waste products to be dealt with by the host and these might affect the efficacy and toxicity for drugs Effects of environmental exposure to sub-therapeutic doses could be quite difficult to show because of all the confounding factors The effect of the presence in the environment of AMR bacteria, capable of colonizing the GI tracts of humans with unwanted consequences, is clear.
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