Presentation on theme: "BIOMARKER DAN BIOINDIKATOR"— Presentation transcript:
1BIOMARKER DAN BIOINDIKATOR BAHAN KULIAHANALISIS PENCEMARAN
21.MonitoringMonitoring must take into consideration the type or types of contaminants present (biological and chemical), their availability and the possibility of biomagnification and bioaccumulation.The environmental monitoring must be able to detect with accuracy and consistency pollutants present at very low levels.
32.Biomarkers, Test organisms and Bioindicators, The effects of pollutants on whole organisms representative of the environment, known as bioindicators.The effects of pollutants on physiological, biochemical, and molecular characteristics of organisms in the environment, known as biomarkers.The effect of the pollutant on test organisms in the laboratory.
4Bioindicators and biomarkers have the advantage that they measure the action of the pollutants in the real and complex environment where there may be many and complex interactions at sublethal levels.4
5BioMarker Definition: Biomarker is a substance used as an indicator of a biologic stateExistence of living organisms or biological process.A particular disease stateA fragment of DNA sequenceProteinsNucleic acidsCarbohydrateLipidsSmall molecules
6Biomarkers Location of the biomarker: Tissue or organ locations Location of a particular molecule can also be a markerCellular-subcellular locationsTissue or organ locationsThymidylate synthase (TS)nucleus vs the cytoplasmThe higher the level in NE, lower level in the cyto.Lower survival in colorectal cancer patientsGalectin-3Galectin-3 is a member of lectin family. It is wildly distributedIn tissue of epithelial, fibroblast, and dendritic cells.Blood Galectin-3Predict the outcomes for patients with symptoms of heart failure
7Biomarker Detection of biomarker Detection of biomarker – diagnosis Self properties, e.g enzymatic activitiesAntibodies, IHC, ELISADetection of biomarkerQuantitativea link between quantity of the marker and diseaseQualitativea link between exist of a marker and disease
8Biomarker & Diagnosis Ideal Marker for diagnosis Should have great sensitivity, specificity, and accuracy in reflecting total disease burden. A tumor marker should also be prognostic of outcome and predictive of tumor recurrence and effectiveness of anti-cancer treatments.Biomarker for ScreeningThe marker must be highly specific, minimize false positive and negativeThe marker must be able to clearly reflect the early stage of diseaseThe marker must be easily detected without complicated medicalprocedures. The disease markers released to serum and urine are goodtargets for application of early screening.The method for screening should be cost effective.Samples for biomarker detectionBlood, urine, or other body fluids samplesTissue samples
12A.BIOMARKERSBiomarkers can be defined as quantitative measures of changes in the biological system in response to pollutant exposure.Biomarkers can be placed into three groups;biochemical,immunochemical, andgenetic.
14Use of Biomarkers in Epidemiology and Clinical Medicine TraditionalExposure DiseaseBiological or Molecular EpidemiologyMarkers of Exposure Biomarkers of DiseaseExposure dose biological effectAltered clinical prognosisstructure/ diagnosisfunction
15Predictive Biomarkers for Lung Cancer Current Status / Perspectives:Although curative resection of patients withearly-stage lung CA are performed, the riskof relapse remains substantialIndicates that there may be micro-invasion/metastasis have not beendetected by general imaging and/orpathological examinationsPredictive biomarkers will allow the selection of lung cancer patients who may need moreaggressive screening and treatment
162.1.Biochemical biomarkers Based on the ability of the pollutant to generate a response at the gene level, inducing or increasing specific enzymes involved with detoxification of contaminants.The detoxification of xenobiotics often involves one of three detoxification strategies:- cytochrome P450,- conjugation with glutathione and-chelation by proteins (Metallothioneines).
182.2.Immunochemical biomarkers The specific reaction between antigens and antibodies can be used to determine the presence of xenobiotics in environmental samples.Antibodies against PCBs (polychlorinated biphenyls), PCDDs (polychlorinated dibenzo-p-dioxins), and PCDFs (polychlorinated dibenzofurans) have been developed and used in an ELISA system to determine PCBs in samples (Hahn, 2002).
192.3.Genetic biomarkers Ames test The Ames test was developed to test substances for their ability to produce mutations in bacteria. The test consists of the treatment of a Salmonella typhimurium histidine auxotroph (His-). The test compound is added to the Salmonella typhimurium His- in an extract of rat liver.If the compound is a mutagen then mutations will cause revertants- colonies will form on a medium lacking histidine. The number of colonies will give a measure of the mutagenic potential.
212.4.Molecular biology biomarkers Another development using genetic manipulation of biological material for the estimation of toxicity has been the generation of a transgenic strain of the nematode Caenorhabditis elegans .The lacZ gene from E. coli is fused to the hsp16 gene.When the nematode is stressed the enzyme is induced in the worm. The enzyme can be detected by the addition of a substrate such as o-nitrophenyl-p-galactopyranoside (ONPG), which will produce a blue colour when cleaved by the enzyme.
232.5.Fish and Endocrine Disruptors/ Modulators Fish are good indicators for the aquaticenvironmentFish health and fish populationsCommercially and recreationally-important speciesEcologically important speciesIndicators of effects on aquatic ecosystem andultimately human health
242.5.1.Endocrine ModulatorsSynthetic or naturally-occurring chemicals thatmodify or disrupt normal hormonal functionsAlterations in synthesis and metabolismImproper balance or quantity of circulating hormonesDirectly or indirectly interact with natural hormonesChange hormone message and alter cell activityInduce creation of extra receptor sitesAmplify the hormone effect on cell activityBlock binding sitesImpair normal cell activityBind to receptors (hormone mimics)Abnormal, unpredictable cell activity
26Common Serum Markers for Cancer Diagnosis/prognosis AFPCEACA15-3CA19-9CA125PSAPSAfPAPhTGHCGbFerrNSEB2MA2MLungxPancreasKidneyBreastOvarianCervicalUterineProstateLiverGastroColonBladderBrainLeukemiaMyelomaThyroidTesticular
27Prostate Cancer marker PSA PSA is a protein normally made in the prostate gland in ductal cells that make some of the semen. PSA helps to keep the semen liquid. PSA, also known as kallikrein III, seminin, semenogelase, γ-seminoprotein and P-30 antigen, is a glycoprotein, a serine proteasePSA has several forms in serumFreePre-enzymeComplexInactive
28B.BIOINDICATORSBioindicator organisms are those that can be used to identify and quantify the effects of pollutants on the environment.Lichens are a symbiotic relationship between an alga and fungus and are particularly sensitive to air pollutants and have been used widely used as bioindicators of air quality (Conti and Cecchetti, 2001)Honey bees have been used as a bioindicator for the contamination of the atmosphere by heavy metals (cadmium, chromium, and lead).The filter-feeding mussels are known to accumulate heavy metals, making them ideal for the monitoring of coastal waters eg. Mediterranean mussel Myttlus galloprovincialis (Regioli and Principato, 1995).Frogs, fish eggs as a measure of water quality
29Bioindikator adalah kelompok atau komunitas organisme yang keberadaannya atau perilakunya di alam berhubungan dengan kondisi lingkunganApabila terjadi perubahan kualitas air maka akan berpengaruh terhadap keberadaaan dan perilaku organisme tersebut, sehingga dapat digunakan sebagai penunjuk kualitas lingkungan.
59"Wolf lichen" (Letharia vulpina) was the most widely used dye lichen for native peoples in North AmericaThe Apache painted wolf-lichen crosses on their feet so they could pass their enemies unseen.Tribes (the Gitksan) in British Columbia associated the lichen Lobaria pulmonaria with frogs and used it in a spring bathing ritual to bring health and long life.
60What are indicator species? Some species can alert us to harmful changes that are taking place in biological communities (Miller,,Living in the Environment: p. 147) A famous example is the canaries that coal miners took down into the mine shafts in the 1800’s and early 1900’s.We call these bioindicators. They can tell us about the overall health of an ecosystem.
61We will be studying species that act as bioindicators of stream quality. works/cranefly.htmlInsect larvae that develop in streams are valuable bioindicators. An example is the Dameselfly. The presence of Damselfly adults (left) and larvae (right) indicate moderately clean water. They are somewhat sensitive to pollution and so water they are found in will be of good to fair quality. Why are we concerned about the quality of stream water, anyway?
62Jenis Bioindikator Planktonkton Bentos merupakan organisme perairan yang keberadaannya dapat dijadikan indikator perubahan kualitas biologi perairan sungai. Plankton memegang peran penting dalam mempengaruhi produktifitas primer perairan sungai.Bentosmerupakanindikator biologis dalam mempelajari ekosistem sungai . Hal ini disebabkan adanya respon yang berbeda terhadap suatu bahan pencemar yang masuk dalam perairan sungai dan bersifat immobile
63What do we mean when we say ‘healthy stream’? Plenty of Oxygen 02Oxygen for cellular respiration -----> energyA source of nutrition; use this to review food webs: note bioindicators in this web!A place to reproduce: clean,unsilted gravel; siltation also affects temp. and thus oxygen contentA healthy food webHabitat for reproduction
64Bioindikator Ideal Mudah dalam identifikasi taksonomi Terdistribusi secara luasJumlah banyakKarakter ekologinya diketahuiVariabitas ekologi dan genetiknya rendah
66Biological Methods to Assess Water Quality Physiological methods = experimental - ecological methodsEcological methods= descriptive - analytic field methods
67Physiological Methods = Biotests Activity of particular metabolic features of the sampleEffect of the sample on the bioactivity of exposed organism
68Ecological Methods = Bioindication Community of organism reflects the situation of the ecosystemSingle Taxa have specific optima and tolerance ranges for selected environmental factor = Bioindicators
70Category Organic Pollution Saprobity SI I No polution Oligosaprobic 1,0 to <1,5I-IIFew polutionOligo to beta-mesosaprobic1,5 to <1,8IIModerate polutionBeta mesosprobic1,8 to <2,3II-IIICritical polutionBeta to Alpha-mesosaprobic2,3 to <2,7IIIHigh PolutionAlpha-mesosaprobic2,7 to 3,2III-IVVery high polutionAlpha-mesosaprobic to polysaprobic3,2 to < 3,5IVExtremly high pPolysaprobic3,5 to 4,0
71We can study populations of Macroinvertebrates as bioindicators of the health and oxygenation of a stream.Macro means large enough to see with your eyes.Invertebrate means animals without backbones.95% of all animals are invertebrates!Examples: insect larvae, crayfish, worms, adult aquatic insects
72Why do these macroinvertebrates make good bioindicators of stream and watershed health? •live in the water for all or most of their life•stay in areas suitable for their survival•are easy to collect•differ in their tolerance to amount and typesof pollution•are easy to identify in a laboratory•often live for more than one year•have limited mobility
73Bioindicators are grouped according to their tolerance of pollution/water quality. Dragonfly larvae tolerate some pollution.1.http://www.schoolsliaison.org.uk/woodgate/streamhabitat. Caddisfly larvae are intolerant of pollution.This uses the Four Taxa Groups from IS handoutLeeches and blood midge larvae are very tolerant of pollution 1.http://www.schoolsliaison.org.uk/woodgate/streamhabitat & michellemahood/image/
74These are Bioindicators which are Pollution Intolerant These are Bioindicators which are Pollution Intolerant. Their presence tells you that the water quality is excellent. We will use the dichotomous key to identify some of these! images from pathfinderscience.net unless otherwise citedTop left: Mayfly nymph All of these are pollution intolerant species. They require 4 ppm O2Top middlet: Caddisfly larvaeTop right: riffle beetle (adult) and larvaeBottom left: Stonefly larvaeBottom right: Dobsonfly larvae
75PeriphytonMany methods have been developed to collect periphyton from natural substrates. All involve quanitatively removing material from a known surface area.Different methods may be needed to collect periphyton from rocks, woody debris, aquatic macrophytes, or other substrates.Substrate size will also determine how samples are collected. Large boulders require the use of a device that prevents the sample from being lost downstream. If the substrate is a fist-sized cobble the rock can be paced in a pan, scraped, then washed into a bottle with stream water.
76Periphyton as indicators Periphyton are used as indicators of environmental condition because they respond rapidly and are sensitive to a number of anthropogenic disturbances, including:habitat degradationnutrient enrichmentmetalsherbicideshydrocarbonsacidification
77Periphyton Biomass Measurements Ash-Free Dry WeightPigment AnalysisBiovolume MeasurementAsh-Free Dry Mass -This is a gravimetric approach that involves filtering the sample on to a pre-dried, pre-weighed filter then drying the sample to a constant weight. The sample is then ashed or oxidized in a muffle furnace and percent organic matter is determined by difference. One of the major drawbacks to this method is that it measures the mass of all of the organic material including detritus, bacteria, insects, as well as periphyton.Pigment Analysis – This method involves extracting the chlorophyll from the algal cells. This method allows the differentiation of algal biomass from other organic constituents in the sample. The main disadvantage to this method is that the amount of chlorophyll within an algal cell is specific to its physiological state and ambient light conditions. The method also requires either a spectrophotometer or fluorometer.Biovolume Measurement- This method determines the biovolume of individual algal cells. It is very time consuming and requires knowledge of algal taxonomy.
78Periphyton – Sampling methods One way to scrape a known area is to lay a plastic 35 mm slide (film removed) over the rock and scrape off the material within the slide areascrub area = 2.3cmX3.5cm=8cm2
79Periphyton – Sampling methods Rocks don’t always look like they have much on themNearly all the stuff scrubbed off this one was organic matter –most of it living algaeS.Loeb and J.Reuter imagesNotes: A tooth brush head was glued to the plunger of a 60 mL polypropylene syringe to make a device that can be used to scrub and then collect material from a standard circle of area. A reasonably flat portion of the rock is needed. A rubber stopper is used to contain the material if collected underwater. The one above, developed by Dr. Stanford Loeb at the U. of California-Davis’s Tahoe Research Group in the late 1970’s fabricated an extra syringe attached to the main one to allow Scuba divers to draw in over a 100 mL of lake water to ensure that all the material is collected. The samplers can be used underwater or on the shoreline of lakes or streams. At Tahoe they were used to sample periphyton to depths of about 30 meters and to sample algae incubated with carbon and nitrogen isotopes to estimate rates of algal assimilation in situ (meaning in place at the actual depth where the rocks were located).
80periphyton – in situ sampling Material from a rock scrub contains macro and micro invertebrates, detritus, fungi, bacteria, as well as algaeRecall that this entire community is also called “aufwuchs” (pronounced owf-wooks)
81Periphyton – III. Preservation methods Lugols’s iodine can used if the algae of interest are soft bodied forms (i.e. blue-greens and green algae).If interested only in diatoms, it may be best to preserve in 70% ethanol.Freeze sediment samples if they are to be analyzed for surficial chlorophyll.Notes on diatoms: the method used to identify diatoms in periphyton samples involves an acid digestion of the sample which removes all organic matter. Diatoms cell walls are glass (called frustules) and species identification entails viewing the fine holes (punctae) and lines (striae) within the frustules. This cannot be done easily if the cell contents are still intact.
82Periphyton – sample prep This involves filtering a known volume of the periphyton suspension. Remember that this volume is arbitrary and what really matters is the weight that was collected from a known area of substrate.Here’s a portion of the previous sample after being deposited on a glass fiber filter in preparation for chlorophyll extraction or AFDW determination.
83Periphyton – pigment analysis Chlorophyll extraction:Tear filter into several piecesPlace in a test tubeAdd 10 mLs of 90% acetoneExtract overnight at 4oCChlorophyll analysisAfter hr extraction, centrifuge to settle filter debrisRead absorbance or fluorescence of the supernatantThe glass fiber filters, if left suspended in the extract, will contribute to increased turbidity in the sample which can reduce the chlorophyll signal. To clarify the sample, centrifuge for 20 minutes at 4000 rpm.Cap the tubes to prevent evaporation of the acetone during the extraction and analysis.Details in chlorophyll method (PDF).Sometimes periphyton samples contain blue-green or green algal filaments. Often the chlorophyll within these filaments will not extract completely without physical disruption. This can be done using a tissue grinder but care must be taken not to overheat the sample (remember that heat degrades chlorophyll). Place the filter in the grinder, then place the grinder into a beaker filled with crushed ice. An alternative is to use an ultrasonic disrupter or sonicator.Alternative solvents and solvent mixtures have been shown to better for some groups of algae (such as hot methanol for blue-greens). However, 90% acetone extracted overnight at 4 oC or ground and analyzed after a 0.5 to 1.0 hr extraction are considered “standard methods”.
84Periphyton – biomass estimation Wet weightDry weight (dried at 103–105 oC)Ash free dry weight (AFDW)Loss on ignition (LOI)Combust at oCChlorophyll (extract as per phytoplankton)Particulate organic carbon and/or nitrogen (POC or PON)Muffle furnaceRemember that this measurement does not distinguish between detritus, algae, fungi, bugs or bacteria.Methods closely follow those used for water column algae. Note that for the organic matter estimation, it is the material that is burned off that is the organic matter. The residue is inorganic “ash”.
85Periphyton – biomass calculations Once you have a measure of chlorophyll or AFDW you’ll need to calculate per unit area.Note:You have to be careful to record the various volumes of solvents and dilution factors and what % of the original sample was used for the different analyses. For water samples it’s easy – just note the volume analyzed. For periphyton and sediment, there was a total amount of sample collected for a given surface area. A portion, by weight, was used for each analysis.
87Fish: index of biotic integrity Fish Keys:Fish Identification SystemFishes of Minnesota
88Fish Fish and other aquatic vertebrates can indicate stream quality Extensive life history information is available for many species,Because many fish are high order consumers, they often reflect the responses of the entire trophic structure to environmental stressFish provide a more publicly understandable indicator of environmental degradationFish generally have long life histories and integrate pollution effects over longer time periods and large spatial scalesText adapted from:USEPA: A National Program for Monitoring Stream Condition in the Western United StatesAmerican Fisheries Society Education Section
89Fish Varieties Collection Methods Seines Electroshocking Backpack Barge or boat
93Fish: index of biotic integrity This index is a scientifically validated combination of measurements concerning fish communities in streams and rivers.The components of a typical fish IBI fall into three broad categories:fish species richness and abundance,food chain composition and reproductive function, andfish abundance and condition.
94Fish: index of biotic integrity An IBI is expressed as a single index value, based on the measurements of particular characteristics of the stream or riverBecause the rivers and streams are physically, chemically and biologically diverse, the measured characteristics are compared to specific reference values for the type and location of river or stream.
95Fish: index of biotic integrity IBI values range from 0 to 100.A low IBI value indicates the fish community is substantially different from a minimally disturbed stream in the same geographic area.A high IBI value indicates the fish community is similar to a minimally disturbed stream in the same geographic region