Appendix IB Protein Biomarkers. Cytochrome P450 monooxygenases are a family of proteins involved in biotransformation of organic chemicals. These are often induced by specific hydrocarbon compounds - aromatic (PAH) or halogenated (e.g., PCP) hydrocarbons. These are mainly assayed in fish. Measures include (1) Catalytic (MFO) enzyme activity in fish liver. EROD and AHH activities are selectively induced. (2) Antibodies to P450; these can reveal the cell types where induction occurs, showing route of exposure and (3) DNA probes. A cDNA probe for fish PAH-inducible P450 has been generated. Response of cytochrome P450 monooxygenases is rapid, up to 6 to 24 h after exposure, with decay rate variable from days to weeks. Detection provides a clear sign that exposure to biochemically significant levels of inducer has occurred. Metallothioneins are metal binding proteins that sequester and metabolize heavy metals. They are induced by both essential and nonessential toxic heavy metals. Their synthesis can be induced by Cd, Cu, Zn, Hg, Co, Ni, Bi and Ag, as well as others. Function of these proteins is poorly known however, so it is not possible to link levels to injury at the cellular level. They are though to be involved in metal detoxification, regulation of Zn and Cu (for nucleic acid metabolism, protein synthesis etc.), donation of metals to metallo proteins. Stress-related increase in metalothioneins occurs, and is mediated by hormones. This biomarker seems to be more effective in fish than invertebrates as an assay of metal exposure. However, liver metal concentrations in fish around an outfall were low, despite high metal concentrations in sediments and water borne particulates (Brown et al. 1987). There are advantages to studying these metal-binding proteins over measuring tissue concentrations of metals. Knowledge of intracellular metal compartmentation is essential to understanding mechanisms of injury. Typically it is the non-bound metals that are causing the injury, and metallothionein induction is a protective cellular response. Metal toxicity usually only occurs after the protective capacity is exceeded. Assay mechanisms are rather complicated. They include immuno-affinity chromatography/AAS or ICP MS. Stress/heat shock proteins reflect changes in gene expression in response to environmental variables. They may protect the cell from damage resulting from environmental perturbations or regulate genes, but not much is known about environmental relevance. Inducers can include heat, metals, xenobiotics and anoxia. Heat shock proteins hsp 90 and hsp70 are not considered here, as heat is not an outfall issue. Glucose related proteins may be assayed by protein-specific antibodies or cDNA probes. Phase II enzymes - act in detoxification and excretion of foreign compounds (ie metabolites from cytochrome P450), linking them to water-soluble endogenous compounds. These include glutathione transferases, epoxide hydrolase (which have little evidence of chemical induction in aquatic species), UDP-Glucuronosyltransferases, and sulfotransferases. Overall, results are not consistent enough for use of Phase II enzymes as biomarkers. Oxidant-mediated responses act to enhance production of oxyradicals in cells, causing induction of antioxidant enzymes, changing concentrations of other antioxidants, or producing lesions. Key antioxidant enzymes include superooxide dismutase (SOD), Catalase (CAT), perioxidase (Px), Glutathione reductase (GR) and DT diaphorase. SODs are highly inducible - but use as a biomarker is speculative. There are also biochemical indices of oxidative damage. These incude lipid peroxidation, DNA oxidation, methemoglobinemia and redox status. Heme/porphyrin synthesis is sensitive to organic and inorganic chemicals. Disruption in the pathway can cause cell injury. Vitellogenin. Vitellogenin (Vg) is an egg yolk precursor protein that is typically expressed only in female fish and is dormant in male fish. It is synthesized by the liver of oviparous fish in response to estradiol stimulation. The blood carries Vg to the ovary, where it is sequestered by oocytes to form the yolk. The presence of vitellogenin in the plasma is indicative of estrogenic stimulation of the liver. When male fish are exposed to estrogenic endocrine disruptors the Vg gene is expressed in a dose-dependent manner. Thus, Vg gene expression in male fish can be used as a molecular marker of exposure to estrogenic EDCs, which often occur in sewage effluent. In most cases feminization results appear to be irreversible (Rodgers Gray 2001). A reverse transcription quantitative polymerase chain reaction (RT-QPCR) is used to quantify Vg gene expression. To study EDC exposure Vg could be measured in caged fish (e.g., Purdom et al. 1993) or in field caught specimens (Lye et al. 1998), although their migration history would be unknown. Most of these biomarkers may be best used in combination. There are strong linkages between classes of biomarkers. Understanding the nature of linkage may be essential to evaluating higher-order effects. 2 Acronym & Definition List ADCP – Acoustic Doppler Current Profiler BACI – Before/After Control/Impact BOD – Biochemical Oxygen Demand BRI – Benthic Response Index CFU – Colony Forming Units CTD – Instrument that measures conductivity, temperature, and depth DIC – Disolved Inorganic Carbon DNA – Deoxyribonucleic Acid EC – Enterococci EPA – Environmental Protection Agency FC – Fecal Coliforms FIB – Fecal Indicator Bacteria FIB – Fecal Indicator Bacteria FVCOM – Finite Volume Calculation Ocean Model GPS – Global Positioning System ITI – Infaunal Trophic Index MDS – Multivariate Multidimensional Scaling NDBC – National Data Buoy Center MGD – Millions of Gallons per Day MMS – Minerals Management Service MPN – Most Probable Numbers MST – Microbial Source Tracking NCEX – Nearshore Canyon Experiment NOAA – National Oceanic and Atmosphere Administration NPDES – National Pollution Discharge Elimination System OCSD – Orange County Sewage District PAHS – Polyaromatic Hydrocarbons PCBs – Polychlorinated Biphenyls PCR – Polymerase Chain Reaction PLOO – Point Loma Ocean Outfall POM – Princeton Oceanographic Model Pycnocline – A region of the water column that has a strong vertical density gradient RNA – Ribonucleic Acid ROMS – Regional Ocean Modeling System SBC–SMB – Santa Barbara Channe –Santa Maria Basin SBOO – South Bay Ocean Outfall SCB – Southern California Bight SCCWRP – Southern California Coastal Water Resources Project SDCOOS – San Diego Coastal Ocean Observing System SICS – Sand Island Ocean Outfall Chlorination Study SIO – Scripps Institution of Oceanography SWRCB - State Water Resources Control Board TCV – Total Coliforms TN – Total Nitrogen 1 TOC – Total Organic Carbon T-S– Temperature–Salinity ZID – Zone of Initial Dilution 2 References Alexander, C. 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