Project 5. Phytoremediation to Degrade Airborne PCB Congeners from Soil &Groundwater Sources The overall goal of Project 5 is to provide engineering research (non-biomedical) for the remediation of sites containing airborne PCB congeners which may expose humans. Specifically, it is to determine whether plants can provide In situ phytoremediation of PCB congeners from the air and other airborne sources like dredged sediments at the planned Confined Disposal Facility (CDF) in East Chicago, Indiana, near two schools. Thus the Project focuses on PCB congeners of higher volatility which are present in Chicago air and which display significant mass, toxicity or persistence in the environment. Plants can uptake PCB congeners from soil and soil-water, intercept semi-volatile congeners from the air onto the waxy cuticle of leaves and bark, and metabolize contaminants directly. In addition, plants stimulate rhizosphere bioremediaton of PCBs by providing the habitat, redox potential, and substrate necessary for degradation. The significance of this project is that, by studying further the genomic, proteomic, and metabolomic basis of PCB phytoremediation, it will provide the scientific basis for the development and application of land management strategies for intervention at contaminated waste sites, and to break the continuous cycling of PCBs in the atmosphere and subsequent exposure to humans.
Four specific aims comprise Project 5: ? Identify plant metabolites of selected PCB congeners (PCB-3, 11, 15, 28, 52, 77, 153) and the uptake/resolution/metabolism of chiral compounds (PCB-95, 136) using GC/MS and LC/MS/MS ? Mineralize PCB mixtures (in mesocosms and site plots) by varying redox conditions which microbially dechlorinates PCBs under anoxic conditions and oxidizes the biphenyl ring under aerobic conditions ? Analyze the proteomic response and toxicity to pure cultures of selected aerobic PCB degraders and identified anaerobic degraders exposed to PCBs and PCB metabolites ? Characterize PCB-induced changes on the soil microbial community at CDF sites and sediments using T-RFLP analysis and proteomic analysis The leading themes of the competitive renewal are to identify more completely the PCB metabolites, the biotransformation proteins involved, and to demonstrate complete mineralization of PCB congeners in the root zone of plants by using the latest techniques of metabolomics and proteomics.

Public Health Relevance

Project 5 provides engineering research (non-biomedical) to provide the scientific basis for land management strategies to remediate contaminated sites and to intervene in the exposure of humans to PCBs and their metabolites. It is integrated with Project 4 on identifying the atmospheric sources of PCBs, with Project 6 on characterizing exposures near the planned confined disposal facility, and with the Synthesis Core. Analytical Core, and Research Translation Core.

Agency
National Institute of Health (NIH)
Institute
National Institute of Environmental Health Sciences (NIEHS)
Type
Hazardous Substances Basic Research Grants Program (NIEHS) (P42)
Project #
5P42ES013661-08
Application #
8451606
Study Section
Special Emphasis Panel (ZES1-LWJ-M)
Project Start
Project End
Budget Start
2013-04-01
Budget End
2014-03-31
Support Year
8
Fiscal Year
2013
Total Cost
$175,241
Indirect Cost
$53,708
Name
University of Iowa
Department
Type
DUNS #
062761671
City
Iowa City
State
IA
Country
United States
Zip Code
52242
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Martinez, Andres; Schnoebelen, Douglas J; Hornbuckle, Keri C (2016) Polychlorinated biphenyl congeners in sediment cores from the Upper Mississippi River. Chemosphere 144:1943-9
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Wangpradit, Orarat; Rahaman, Asif; Mariappan, S V Santhana et al. (2016) Breaking the dogma: PCB-derived semiquinone free radicals do not form covalent adducts with DNA, GSH, and amino acids. Environ Sci Pollut Res Int 23:2138-47
Flor, Susanne; He, Xianran; Lehmler, Hans-Joachim et al. (2016) Estrogenicity and androgenicity screening of PCB sulfate monoesters in human breast cancer MCF-7 cells. Environ Sci Pollut Res Int 23:2186-200

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