WO2010019553A2 - Biomarker detection process and assay of neurological condition - Google Patents

Biomarker detection process and assay of neurological condition Download PDF

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Publication number
WO2010019553A2
WO2010019553A2 PCT/US2009/053376 US2009053376W WO2010019553A2 WO 2010019553 A2 WO2010019553 A2 WO 2010019553A2 US 2009053376 W US2009053376 W US 2009053376W WO 2010019553 A2 WO2010019553 A2 WO 2010019553A2
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biomarker
subject
gfap
uch
assay
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PCT/US2009/053376
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English (en)
French (fr)
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WO2010019553A3 (en
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Kevin Ka-Wang Wang
Ronald L. Hayes
Uwe R. Muller
Zhiqun Zhang
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Banyan Biomarkers, Inc.
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Priority to ES09807153.3T priority Critical patent/ES2665245T3/es
Priority to NO09807153A priority patent/NO2324360T3/no
Priority to JP2011523089A priority patent/JP5781436B2/ja
Priority to US13/058,748 priority patent/US20110143375A1/en
Priority to EP18154197.0A priority patent/EP3336551B1/en
Priority to CA2733990A priority patent/CA2733990C/en
Priority to AU2009282117A priority patent/AU2009282117B2/en
Application filed by Banyan Biomarkers, Inc. filed Critical Banyan Biomarkers, Inc.
Priority to EP09807153.3A priority patent/EP2324360B1/en
Priority to DK09807153.3T priority patent/DK2324360T3/en
Priority to EP23168587.6A priority patent/EP4235181A3/en
Publication of WO2010019553A2 publication Critical patent/WO2010019553A2/en
Publication of WO2010019553A3 publication Critical patent/WO2010019553A3/en
Priority to US14/217,119 priority patent/US20140342381A1/en
Priority to US15/709,368 priority patent/US20180031577A1/en
Priority to US16/890,943 priority patent/US11994522B2/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/68—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids
    • G01N33/6893—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids related to diseases not provided for elsewhere
    • G01N33/6896—Neurological disorders, e.g. Alzheimer's disease
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/40—Detecting, measuring or recording for evaluating the nervous system
    • A61B5/4058—Detecting, measuring or recording for evaluating the nervous system for evaluating the central nervous system
    • A61B5/4064—Evaluating the brain
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/577—Immunoassay; Biospecific binding assay; Materials therefor involving monoclonal antibodies binding reaction mechanisms characterised by the use of monoclonal antibodies; monoclonal antibodies per se are classified with their corresponding antigens
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2800/00—Detection or diagnosis of diseases
    • G01N2800/28—Neurological disorders
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2800/00—Detection or diagnosis of diseases
    • G01N2800/28—Neurological disorders
    • G01N2800/2871—Cerebrovascular disorders, e.g. stroke, cerebral infarct, cerebral haemorrhage, transient ischemic event
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2800/00—Detection or diagnosis of diseases
    • G01N2800/52—Predicting or monitoring the response to treatment, e.g. for selection of therapy based on assay results in personalised medicine; Prognosis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2800/00—Detection or diagnosis of diseases
    • G01N2800/56—Staging of a disease; Further complications associated with the disease
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2800/00—Detection or diagnosis of diseases
    • G01N2800/60—Complex ways of combining multiple protein biomarkers for diagnosis

Definitions

  • the present invention in general relates to determination of neurological condition of an individual and in particular to measuring the quantity of a neuroprotective biomarker such as glial fibrillary acidic protein (GFAP) in concert with another biomarker of neurological condition.
  • a neuroprotective biomarker such as glial fibrillary acidic protein (GFAP)
  • biomarkers As biomarker detection uses a sample obtained from a subject, typically cerebrospinal fluid, blood, or plasma, and detects the biomarkers in that sample, biomarker detection holds the prospect of inexpensive, rapid, and objective measurement of neurological condition.
  • the attainment of rapid and objective indicators of neurological condition allows one to determine severity of a non-normal brain condition with a previously unrealized degree of objectivity, predict outcome, guide therapy of the condition, as well as monitor subject responsiveness and recovery.
  • biomarkers have been identified as being associated with severe traumatic brain injury as is often seen in vehicle collision and combat wounded subjects. These biomarkers included spectrin breakdown products such as SBDP150, SBDP150i, SBDP145 (calpain mediated acute neural necrosis), SBDP120 (caspase mediated delayed neural apoptosis), UCH-Ll (neuronal cell body damage marker), and MAP2 dendritic cell injury associated marker.
  • spectrin breakdown products such as SBDP150, SBDP150i, SBDP145 (calpain mediated acute neural necrosis), SBDP120 (caspase mediated delayed neural apoptosis), UCH-Ll (neuronal cell body damage marker), and MAP2 dendritic cell injury associated marker.
  • UCH-Ll neurovascular endothelial cell body damage marker
  • MAP2 dendritic cell injury associated marker The nature of these biomarkers is detailed in U.S. Patents 7,291,710 and 7,396,654, the contents of which are hereby
  • Glial Fibrillary Acidic Protein a member of the cytoskeletal protein family, is the principal 8-9 nanometer intermediate filament of glial cells such as mature astrocytes of the central nervous system (CNS).
  • GFAP is a monomeric molecule with a molecular mass between 40 and 53 kDa and an isoelectric point between 5.7 and 5.8.
  • GFAP is highly brain specific protein that is not found outside the CNS. GFAP is released into the blood and CSF soon after brain injury.
  • astrocytes become reactive in a way that is characterized by rapid synthesis of GFAP termed astrogliosis or gliosis.
  • GFAP normally increases with age and there is a wide variation in the concentration and metabolic turnover of GFAP in brain tissue.
  • a process for determining the neurological condition of a subject or cells from the subject includes measuring a sample obtained from the subject or cells from the subject at a first time for a quantity of a first biomarker selected from the group of GFAP, UCH-Ll, NSE, MAP2, or SBDP. The sample is also measured for a quantity of at least one additional neuroactive biomarker. Through comparison of the quantity of the first biomarker and the quantity of the at least one additional neuroactive biomarker to normal levels for each biomarker, the neurological condition of the subject is determined.
  • the assay includes: (a) a substrate for holding a sample isolated from a subject or the cells; (b) a first biomarker specifically binding agent wherein a first biomarker is one of GFAP, UCH-Ll, NSE, MAP2, or SBDP; (c) a binding agent specific for another neuroactive biomarker (including one of GFAP, UCH-Ll, NSE, MAP2, or SBDP not chosen as the first biomarker); and (d) printed instructions for reacting the first biomarker specific agent with a first portion of the sample so as to detect an amount of said first biomarker and reacting said at least one additional neuroactive biomarker specific agent with a second portion of the sample and the at least one additional neuroactive biomarker in the sample so as to detect an amount of said at least one additional neuroactive biomarker for relation to the condition of the subject or cells derived the subject.
  • a process for determining if a subject has suffered mild traumatic brain injury or moderate traumatic brain injury in an event includes measuring a sample obtained from the subject or cells from the subject at a first time after the event for a quantity of GFAP. By comparing the quantity of GFAP to normal levels of GFAP in a control, one determines if the subject has suffered mild traumatic brain injury or moderate traumatic brain injury in the event.
  • Fig. 1 represents quantitative western blotting of UCH-Ll in rat CSF following MCAO;
  • Fig. 2 represents UCH-Ll levels in CSF in sham and CCI treated subjects
  • Fig. 3 represents UCH-Ll levels in CSF following sham, mild MCAO challenge, and severe MCAO challenge;
  • Fig. 4 represents UCH-Ll levels in serum following sham or CCI at various timepoints
  • Fig. 5 represents UCH-Ll levels in serum following sham, mild MCAO challenge, and severe MCAO challenge;
  • Fig. 6 represents SBDP145 levels in CSF and serum following sham, mild MCAO challenge, and severe MCAO challenge
  • Fig. 7 represents SBDP120 levels in CSF and serum following sham, mild MCAO challenge, and severe MCAO challenge
  • Fig. 8 represents MAP2 elevation in CSF and serum following sham, mild MCAO challenge, and severe MCAO challenge;
  • Fig. 9 are bar graphs of GFAP and other biomarkers for human control and severe TBI subjects from CSF samples;
  • Fig. 10 are bar graphs of GFAP and other biomarkers for human control and severe
  • Fig. 11 are bar graphs of GFAP and other biomarkers for human control and severe
  • FIGS. 9 and 10 TBI subjects summarizing the data of FIGS. 9 and 10;
  • Fig. 12 are plots of arterial blood pressure (MABP), intracranial pressure (ICP) and cerebral profusion pressure (CPP) for a single human subject of traumatic brain injury as a function of time;
  • MABP arterial blood pressure
  • ICP intracranial pressure
  • CPP cerebral profusion pressure
  • Fig. 13 are plots of inventive biomarkers from CSF and serum samples from the single human subject of traumatic brain injury of FIG. 12 as a function of time;
  • Fig. 14 are plots of inventive biomarkers from CSF and serum samples from another individual human subject of traumatic brain injury as a function of time;
  • Fig. 15 are plots of UCH-Ll amounts being present in CSF and serum post severe traumatic brain injury in a mouse subject;
  • Fig. 16 are bar graphs of GFAP concentration for controls, as well as individuals in the mild/moderate traumatic brain injury cohort as a function of CT scan results upon admission and 24 hours thereafter;
  • Fig. 17 are bar graphs of parallel assays for UCH-Ll biomarker from the samples used for FIG. 16;
  • Fig. 18 are bar graphs showing the concentration of UCH-Ll and GFAP as well as a biomarker not selected for diagnosis of neurological condition, SlOO beta, provided as a function of injury magnitude between control, mild, and moderate traumatic brain injury;
  • Fig. 19 are bar graphs showing the concentration of the same markers as depicted in FIG. 18 with respect to initial evidence upon hospital admission as to lesions in tomography scans;
  • Fig. 20 represents biomarker levels in human subjects with varying types of brain injury
  • Fig. 21 are plots that represent ROC analysis of UCH-Ll, GFAP and SBDP145 in human CSF (severe TBI vs. Control A) First 24 hours post-injury;
  • Fig. 22 is a plot that represent ROC analysis of UCH-Ll and GFAP in human CSF
  • Fig. 23 are bar graphs of showing the elevation of brain injury biomarkers (GFAP,
  • UCH-Ll and MAP2 in plasma from stroke patients.
  • the present invention has utility in the diagnosis and management of abnormal neurological condition.
  • a biomarker such as GFAP from a subject in combination with values obtained for an additional neuroactive biomarker, a determination of subject neurological condition is provided with greater specificity than previously attainable.
  • the present description is directed toward a first biomarker of GFAP for illustrative purposes only and is not meant to be a limitation on the practice or scope of the present invention. It is appreciated that the invention encompasses several other first and additional biomarkers illustratively including UCH-Ll, NSE, MAP2, and SBDP. The description is appreciated by one of ordinary skill in the art as fully encompassing all inventive biomarkers as an inventive first biomarker as described herein.
  • the present invention provides for the detection of a neurological condition in a subject.
  • a neurological condition may be an abnormal neurological condition such as that caused by genetic disorder, injury, or disease to nervous tissue.
  • the present invention also provides an assay for detecting or diagnosing the neurological condition of a subject.
  • the neurological condition may be the result of stress such as that from exposure to environmental, therapeutic, or investigative compounds
  • brain injury is divided into two levels, mild traumatic brain injury (MTBI), and traumatic brain injury (TBI).
  • An intermediate level of moderate TBI is also referred to herein.
  • the spectrum between MTBI and extending through moderate TBI is also referred to synonymously mild to moderate TBI or by the abbreviation MMTBI.
  • TBI is defined as an injury that correlates with a two-fold increase or greater of twofold decrease or greater in molecular marker levels or activities.
  • MTBI is defined and an injury that correlates with less than a two-fold increase or two-fold decrease in molecular marker levels or activities.
  • An inventive process preferably includes determining the neurological condition of a subject by assaying a sample derived from a subject at a first time for the presence of a first biomarker.
  • a biomarker is a cell, protein, nucleic acid, steroid, fatty acid, metabolite, or other differentiator useful for measurement of biological activity or response.
  • Biomarkers operable herein illustratively include: ubiquitin carboxyl-terminal esterase, ubiquitin carboxy-terminal hydrolase, spectrin breakdown product(s), a neuronally-localized intracellular protein, MAP-tau, C-tau, MAP2, poly (ADP-ribose) polymerase (PARP), collapsin response mediator protein, Annexin All, Aldehyde dehydrogenase family 7, Cofilin 1, Profilin 1, ⁇ -Enolase (non-neural enolase), Enolase 1 protein, Glyceraldehyde-3-phosphate dehydrogenase, Hexokinase 1, Aconitase 2, Acetyl-CoA synthetase 2, Neuronal protein 22, Phosphoglycerate kinase 2, Phosphoglycerate kinase 1, Hsc70-psl, Grutamate dehydrogenase 1, Aldolase A,
  • biomarkers illustratively include those identified by Kobeissy, FH, et al, Molecular & Cellular Proteomics, 2006; 5:1887-1898, the contents of which are incorporated herein by reference, or others known in the art.
  • a first biomarker is preferably a neuroactive biomarker.
  • neuroactive biomarkers include GFAP, ubiquitin carboxyl-terminal esterase Ll (UCH-Ll), Neuron specific enolase (NSE), spectrin breakdown products (SBDP), preferably SBDP150, SBDP 150i SBDP 145, SBDP 120, SlOO calcium binding protein B (SlOOb), microtubule associated proteins (MAP), preferably MAP2, MAPI, MAP3, MAP4, MAP5, myelin basic protein (MBP), Tau, Neurofilament protein (NF), Cannabinoid Receptor (CB), CAM proteins, Synaptic protein, collapsin response mediator proteins (CRMP), inducible nitric oxide synthase (iNOS), Neuronal Nuclei protein (NeuN), 2',3'-cyclic nucleotide-3'-phosphohydrolase (CNPase), Neuroserpin, alpha-internex
  • the inventive process also includes assaying the sample for at least one additional neuroactive biomarker.
  • the one additional neuroactive biomarker is preferably not the same biomarker as the first biomarker. Any of the aforementioned inventive biomarkers are operable as an additional neuroactive biomarker. Any number of biomarkers can be detected such as 2, 3, 4, 5, 6, 7, 8, 9, 10, or more. Detection can be either simultaneous or sequential and may be from the same biological sample or from multiple samples from the same or different subjects. Preferably, detection of multiple biomarkers is in the same assay chamber.
  • a biomarker is GFAP.
  • GFAP is associated with glial cells such as astrocytes.
  • an additional neuroactive biomarker is associated with the health of a different type of cell associated with neural function.
  • CNPase is found in the myelin of the central nervous system, and NSE is found primarily in neurons. More preferably, the other cell type is an axon, neuron, or dendrite.
  • UCH-Ll in combination with other biomarkers such as GFAP and MAP2.
  • biomarkers may be predictors of different modes or types of damage to the same cell type.
  • an inventive assay inclusive of biomarkers associated with glial cells as well as at least one other type of neural cell the type of neural cells being stressed or killed as well as quantification of neurological condition results provides rapid and robust diagnosis of traumatic brain injury type.
  • Measuring GFAP along with at least one additional neuroactive biomarker and comparing the quantity of GFAP and the additional biomarker to normal levels of the markers provides a determination of subject neurological condition.
  • specific biomarker levels that when measured in concert with GFAP afford superior evaluation of subject neurological condition include SBDP 150, SBDP150i, a combination of SBDP145 (calpain mediated acute neural necrosis) and SBDP120 (caspase mediated delayed neural apoptosis), UCH-Ll (neuronal cell body damage marker), and MAP2.
  • SBDP 150 calpain mediated acute neural necrosis
  • SBDP120 caspase mediated delayed neural apoptosis
  • UCH-Ll neurovascular cell body damage marker
  • a sample is preferably a biological sample.
  • biological samples are illustratively cells, tissues, cerebral spinal fluid (CSF), artificial CSF, whole blood, serum, plasma, cytosolic fluid, urine, feces, stomach fluids, digestive fluids, saliva, nasal or other airway fluid, vaginal fluids, semen, buffered saline, saline, water, or other biological fluid recognized in the art.
  • CSF cerebral spinal fluid
  • cytosolic fluid whole blood
  • urine feces, stomach fluids, digestive fluids, saliva, nasal or other airway fluid, vaginal fluids, semen, buffered saline, saline, water, or other biological fluid recognized in the art.
  • a biological sample is CSF or blood serum. It is appreciated that two or more separate biological samples are optionally assayed to elucidate the neurological condition of the subject.
  • biomarkers In addition to increased cell expression, biomarkers also appear in biological fluids in communication with injured cells.
  • CSF cerebrospinal fluid
  • blood plasma
  • serum saliva and urine
  • samples that are biological fluids are preferred for use in the invention.
  • CSF in particular, is preferred for detecting nerve damage in a subject as it is in immediate contact with the nervous system and is readily obtainable.
  • Serum is a preferred biological sample as it is easily obtainable and presents much less risk of further injury or side-effect to a donating subject.
  • samples of CSF or serum are collected from subjects with the samples being subjected to measurement of GFAP as well as other neuroactive biomarkers.
  • the subjects vary in neurological condition.
  • Detected levels of GFAP and other neuroactive biomarkers are optionally then correlated with CT scan results as well as GCS scoring. Based on these results, an inventive assay is developed and validated (Lee et al., Pharmacological Research 23:312-328, 2006). It is appreciated that GFAP and other neuroactive biomarkers, in addition to being obtained from CSF and serum, are also readily obtained from blood, plasma, saliva, urine, as well as solid tissue biopsy.
  • CSF is a preferred sampling fluid owing to direct contact with the nervous system
  • other biological fluids have advantages in being sampled for other purposes and therefore allow for inventive determination of neurological condition as part of a battery of tests performed on a single sample such as blood, plasma, serum, saliva or urine.
  • a biological sample is obtained from a subject by conventional techniques.
  • CSF is preferably obtained by lumbar puncture.
  • Blood is preferably obtained by venipuncture, while plasma and serum are obtained by fractionating whole blood according to known methods.
  • Surgical techniques for obtaining solid tissue samples are well known in the art. For example, methods for obtaining a nervous system tissue sample are described in standard neurosurgery texts such as Atlas of Neurosurgery: Basic Approaches to Cranial and Vascular Procedures, by F. Meyer, Churchill Livingstone, 1999; Stereotactic and Image Directed Surgery of Brain Tumors, 1st ed., by David G. T.
  • samples that contain nerve cells are illustratively suitable biological samples for use in the invention.
  • nerve cells e.g., a biopsy of a central nervous system or peripheral nervous system tissue
  • other cells express illustratively ⁇ ll-spectrin including, for example, cardiomyocytes, myocytes in skeletal muscles, hepatocytes, kidney cells and cells in testis.
  • a biological sample including such cells or fluid secreted from these cells might also be used in an adaptation of the inventive methods to determine and/or characterize an injury to such non-nerve cells.
  • a subject illustratively includes a dog, a cat, a horse, a cow, a pig, a sheep, a goat, a chicken, non-human primate, a human, a rat, and a mouse.
  • Subjects who most benefit from the present invention are those suspected of having or at risk for developing abnormal neurological conditions, such as victims of brain injury caused by traumatic insults (e.g., gunshot wounds, automobile accidents, sports accidents, shaken baby syndrome), ischemic events (e.g., stroke, cerebral hemorrhage, cardiac arrest), neurodegenerative disorders (such as Alzheimer's, Huntington's, and Parkinson's diseases; prion-related disease; other forms of dementia), epilepsy, substance abuse (e.g., from amphetamines, Ecstasy/MDMA, or ethanol), and peripheral nervous system pathologies such as diabetic neuropathy, chemotherapy-induced neuropathy and neuropathic pain.
  • traumatic insults e.g., gunshot wounds, automobile accidents, sports accidents, shaken baby syndrome
  • ischemic events e.g., stroke, cerebral hemorrhage, cardiac arrest
  • neurodegenerative disorders such as Alzheimer's, Huntington's, and Parkinson's diseases; prion-related disease; other forms of dementia
  • Baseline levels of several biomarkers are those levels obtained in the target biological sample in the species of desired subject in the absence of a known neurological condition. These levels need not be expressed in hard concentrations, but may instead be known from parallel control experiments and expressed in terms of fluorescent units, density units, and the like. Typically, in the absence of a neurological condition SBDPs are present in biological samples at a negligible amount.
  • SBDPs are present in biological samples at a negligible amount.
  • UCH-Ll is a highly abundant protein in neurons. Determining the baseline levels of UCH-Ll in neurons of particular species is well within the skill of the art. Similarly, determining the concentration of baseline levels of MAP2, GFAP, NSE, or other biomarker is well within the skill of the art.
  • the term "diagnosing” means recognizing the presence or absence of a neurological or other condition such as an injury or disease. Diagnosing is optionally referred to as the result of an assay wherein a particular ratio or level of a biomarker is detected or is absent.
  • a "ratio" is either a positive ratio wherein the level of the target is greater than the target in a second sample or relative to a known or recognized baseline level of the same target. A negative ratio describes the level of the target as lower than the target in a second sample or relative to a known or recognized baseline level of the same target. A neutral ratio describes no observed change in target biomarker.
  • an injury is an alteration in cellular or molecular integrity, activity, level, robustness, state, or other alteration that is traceable to an event.
  • Injury illustratively includes a physical, mechanical, chemical, biological, functional, infectious, or other modulator of cellular or molecular characteristics.
  • An event is illustratively, a physical trauma such as an impact (percussive) or a biological abnormality such as a stroke resulting from either blockade or leakage of a blood vessel.
  • An event is optionally an infection by an infectious agent.
  • An injury is optionally a physical event such as a percussive impact.
  • An impact is the like of a percussive injury such as resulting to a blow to the head that either leaves the cranial structure intact or results in breach thereof.
  • CCI controlled cortical impact
  • TBI may also result from stroke.
  • Ischemic stroke is optionally modeled by middle cerebral artery occlusion (MCAO) in rodents.
  • MCAO middle cerebral artery occlusion
  • UCH-Ll protein levels are increased following mild MCAO which is further increased following severe MCAO challenge.
  • Mild MCAO challenge may result in an increase of protein levels within two hours that is transient and returns to control levels within 24 hours.
  • severe MCAO challenge results in an increase in protein levels within two hours following injury and may be much more persistent demonstrating statistically significant levels out to 72 hours or more.
  • An exemplary process for detecting the presence or absence of GFAP and one or more other neuroactive biomarkers in a biological sample involves obtaining a biological sample from a subject, such as a human, contacting the biological sample with a compound or an agent capable of detecting of the marker being analyzed, illustratively including an antibody or aptamer, and analyzing binding of the compound or agent to the sample after washing. Those samples having specifically bound compound or agent express the marker being analyzed.
  • An inventive process can be used to detect GFAP and one or more other neuroactive biomarkers in a biological sample in vitro, as well as in vivo.
  • the quantity of GFAP and one or more other neuroactive biomarkers in a sample is compared with appropriate controls such as a first sample known to express detectable levels of the marker being analyzed (positive control) and a second sample known to not express detectable levels of the marker being analyzed (a negative control).
  • in vitro techniques for detection of a marker illustratively include enzyme linked immunosorbent assays (ELISAs), radioimmuno assay, radioassay, western blot, Southern blot, northern blot, immunoprecipitation, immunofluorescence, mass spectrometry, RT-PCR, PCR, liquid chromatography, high performance liquid chromatography, enzyme activity assay, cellular assay, positron emission tomography, mass spectroscopy, combinations thereof, or other technique known in the art.
  • in vivo techniques for detection of a marker include introducing a labeled agent that specifically binds the marker into a biological sample or test subject.
  • the agent can be labeled with a radioactive marker whose presence and location in a biological sample or test subject can be detected by standard imaging techniques.
  • the first biomarker specifically binding agent and the agent specifically binding at least one additional neuroactive biomarker are both bound to a substrate. It is appreciated that a bound agent assay is readily formed with the agents bound with spatial overlap, with detection occurring through discernibly different detection for first biomarker and each of at least one additional neuroactive biomarkers. A color intensity based quantification of each of the spatially overlapping bound biomarkers is representative of such techniques.
  • Any suitable molecule that can specifically bind GFAP and any suitable molecule that specifically binds one or more other neuroactive biomarkers are operative in the invention to achieve a synergistic assay.
  • a preferred agent for detecting GFAP or the one or more other neuroactive biomarkers is an antibody capable of binding to the biomarker being analyzed.
  • an antibody is conjugated with a detectable label.
  • Such antibodies can be polyclonal or monoclonal.
  • An intact antibody, a fragment thereof (e.g., Fab or F(ab') 2 ), or an engineered variant thereof (e.g., sFv) can also be used.
  • Such antibodies can be of any immunoglobulin class including IgG, IgM, IgE, IgA, IgD and any subclass thereof.
  • Antibodies for numerous inventive biomarkers are available from vendors known to one of skill in the art.
  • antibodies directed to inventive biomarkers are available from Santa Cruz Biotechnology (Santa Cruz, CA).
  • Exemplary antibodies operative herein to detect a fist biomarker include anti-GFAP antibody, anti-UCH-Ll antibody, anti-NSE antibody, anti-MAP2 antibody, or an anti-SBDP antibody.
  • biomarkers to be targeted as part of an inventive assay different from the first biomarker include GFAP, NSE, SBDP, SBDP150, SBDP145, SBDP120, SlOOb, MAP2, MAPI, MAP3, MAP4, MAP5, MBP, Tau, Neurofilament protein (NF), Cannabinoid Receptor CB, CAM, Synaptic protein, CRMP, iNOS, NeuN, CSPase, Neuroserpin, alpha-internexin, LC3, Neurofascin, EAAT, Nestin, Cortin-1, or Bill- Tubulin
  • An antibody is optionally labeled.
  • Labels and labeling kits are commercially available optionally from Invitrogen Corp, Carlsbad, CA. Labels illustratively include, fluorescent labels, biotin, peroxidase, radionucleotides, or other label known in the art. Alternatively, a detection species of another antibody or other compound known to the art is used as form detection of a biomarker bound by an antibody.
  • Antibody-based assays are preferred for analyzing a biological sample for the presence of GFAP and one or more other neuroactive biomarkers. Suitable western blotting methods are described below in the examples section. For more rapid analysis (as may be important in emergency medical situations), immunosorbent assays (e.g., ELISA and RIA) and immunoprecipitation assays may be used.
  • immunosorbent assays e.g., ELISA and RIA
  • immunoprecipitation assays may be used.
  • the biological sample or a portion thereof is immobilized on a substrate, such as a membrane made of nitrocellulose or PVDF; or a rigid substrate made of polystyrene or other plastic polymer such as a microtiter plate, and the substrate is contacted with an antibody that specifically binds GFAP, or one of the other neuroactive biomarkers under conditions that allow binding of antibody to the biomarker being analyzed. After washing, the presence of the antibody on the substrate indicates that the sample contained the marker being assessed. If the antibody is directly conjugated with a detectable label, such as an enzyme, fluorophore, or radioisotope, the presence of the label is optionally detected by examining the substrate for the detectable label. Alternatively, a detectably labeled secondary antibody that binds the marker- specific antibody is added to the substrate. The presence of detectable label on the substrate after washing indicates that the sample contained the marker.
  • a detectable label such as an enzyme, fluorophore, or radioisotope
  • any other suitable agent e.g., a peptide, an aptamer, or a small organic molecule
  • a suitable agent e.g., a peptide, an aptamer, or a small organic molecule
  • an aptamer that specifically binds all spectrin and/or one or more of its SBDPs might be used.
  • Aptamers are nucleic acid-based molecules that bind specific ligands. Methods for making aptamers with a particular binding specificity are known as detailed in U.S. Patent Nos.
  • a myriad of detectable labels that are operative in a diagnostic assay for biomarker expression are known in the art.
  • Agents used in methods for detecting GFAP or another neuroactive biomarker are conjugated to a detectable label, e.g., an enzyme such as horseradish peroxidase.
  • Agents labeled with horseradish peroxidase can be detected by adding an appropriate substrate that produces a color change in the presence of horseradish peroxidase.
  • detectable labels that may be used are known. Common examples of these include alkaline phosphatase, horseradish peroxidase, fluorescent compounds, luminescent compounds, colloidal gold, magnetic particles, biotin, radioisotopes, and other enzymes.
  • a primary/secondary antibody system is optionally used to detect one or more biomarkers.
  • a primary antibody that specifically recognizes one or more biomarkers is exposed to a biological sample that may contain the biomarker of interest.
  • a secondary antibody with an appropriate label that recognizes the species or isotype of the primary antibody is then contacted with the sample such that specific detection of the one or more biomarkers in the sample is achieved.
  • the present invention employs a step of correlating the presence or amount of GFAP alone, or with one or more other neuroactive biomarker in a biological sample with the severity and/or type of nerve cell injury. GFAP measurement alone is shown herein to be highly effective in detecting MMTBI.
  • the amount of GFAP and one or more other neuroactive biomarkers in the biological sample are associated with a neurological condition such as traumatic brain injury as detailed in the examples.
  • a neurological condition such as traumatic brain injury as detailed in the examples.
  • the results of an inventive assay to synergistically measure GFAP and one or more other neuroactive biomarkers can help a physician or veterinarian determine the type and severity of injury with implications as to the types of cells that have been compromised. These results are in agreement with CT scan and GCS results, yet are quantitative, obtained more rapidly, and at far lower cost.
  • the present invention provides a step of comparing the quantity of GFAP and the amount of at least one other neuroactive biomarker to normal levels to determine the neurological condition of the subject.
  • biomarkers allows one to identify the types of cells implicated in an abnormal neurological condition as well as the nature of cell death in the case of an axonal injury marker, namely an SBDP.
  • the practice of an inventive process provides a test which can help a physician determine suitable therapeutics to administer for optimal benefit of the subject. While the data provided in the examples herein are provided with respect to a full spectrum of traumatic brain injury, it is appreciated that these results are applicable to ischemic events, neurodegenerative disorders, prion related disease, epilepsy, chemical etiology and peripheral nervous system pathologies. As is shown in the subsequently provided example data, a gender difference is unexpectedly noted in abnormal subject neurological condition.
  • the assay includes: (a) a substrate for holding a sample isolated from a subject suspected of having a damaged nerve cell, the sample being a fluid in communication with the nervous system of the subject prior to being isolated from the subject; (b) a GFAP (or other biomarker) specific binding agent; (c) a binding agent specific for another neuroactive biomarker; and (d) printed instructions for performing the assay illustratively for reacting: the specific binding agent with the biological sample or a portion of the biological sample to detect the presence or amount of biomarker, and the agent specific for another neuroactive biomarker with the biological sample or a portion of the biological sample to detect the presence or amount of the at least one biomarker in the biological sample.
  • the inventive assay can be used to detect a neurological condition for financial renumeration.
  • the assay optionally includes a detectable label such as one conjugated to the agent, or one conjugated to a substance that specifically binds to the agent, such as a secondary antibody.
  • a detectable label such as one conjugated to the agent, or one conjugated to a substance that specifically binds to the agent, such as a secondary antibody.
  • An inventive process illustratively includes diagnosing a neurological condition in a subject, treating a subject with a neurological condition, or both.
  • an inventive process illustratively includes obtaining a biological sample from a subject.
  • the biological sample is assayed by mechanisms known in the art for detecting or identifying the presence of one or more biomarkers present in the biological sample. Based on the amount or presence of a target biomarker in a biological sample, a ratio of one or more biomarkers is optionally calculated.
  • the ratio is optionally the level of one or more biomarkers relative to the level of another biomarker in the same or a parallel sample, or the ratio of the quantity of the biomarker to a measured or previously established baseline level of the same biomarker in a subject known to be free of a pathological neurological condition.
  • the ratio allows for the diagnosis of a neurological condition in the subject.
  • An inventive process also optionally administers a therapeutic to the subject that will either directly or indirectly alter the ratio of one or more biomarkers.
  • An inventive process is also provided for diagnosing and optionally treating a multiple-organ injury. Multiple organs illustratively include subsets of neurological tissue such as brain, spinal cord and the like, or specific regions of the brain such as cortex, hippocampus and the like.
  • Multiple injuries illustratively include apoptotic cell death which is detectable by the presence of caspase induced SBDPs, and oncotic cell death which is detectable by the presence of calpain induced SBDPs.
  • the inventive process illustratively includes assaying for a plurality of biomarkers in a biological sample obtained from a subject wherein the biological was optionally in fluidic contact with an organ suspected of having undergone injury or control organ when the biological sample was obtained from the subject.
  • the inventive process determines a first subtype of organ injury based on a first ratio of a plurality of biomarkers.
  • the inventive process also determines a second subtype of a second organ injury based on a second ratio of the plurality of biomarkers in the biological sample.
  • the ratios are illustratively determined by processes described herein or known in the art.
  • the subject invention illustratively includes a composition for distinguishing the magnitude of a neurological condition in a subject.
  • An inventive composition is either an agent entity or a mixture of multiple agents.
  • a composition is a mixture.
  • the mixture optionally contains a biological sample derived from a subject.
  • the subject is optionally suspected of having a neurological condition.
  • the biological sample in communication with the nervous system of the subject prior to being isolated from the subject.
  • inventive composition also contains at least two primary agents, preferably antibodies, that specifically and independently bind to at least two biomarkers that may be present in the biological sample.
  • the first primary agent is in antibody that specifically binds GFAP.
  • a second primary agent is preferably an antibody that specifically binds a ubiquitin carboxyl-terminal hydrolase, preferably UCH-Ll, or a spectrin breakdown product.
  • the agents of the inventive composition are optionally immobilized or otherwise in contact with a substrate.
  • the inventive teachings are also preferably labeled with at least one detectable label.
  • the detectable label on each agent is unique and independently detectable in either the same assay chamber or alternate chambers.
  • a secondary agent specific for detecting or binding to the primary agent is labeled with at least one detectable label.
  • the primary agent is a rabbit derived antibody.
  • a secondary agent is optionally an antibody specific for a rabbit derived primary antibody.
  • the invention employs a step of correlating the presence or amount of a biomarker in a biological sample with the severity and/or type of nerve cell (or other biomarker-expressing cell) injury.
  • the amount of biomarker(s) in the biological sample directly relates to severity of nerve tissue injury as a more severe injury damages a greater number of nerve cells which in turn causes a larger amount of biomarker(s) to accumulate in the biological sample (e.g., CSF; serum).
  • the biological sample e.g., CSF; serum.
  • Whether a nerve cell injury triggers an apoptotic and/or necrotic type of cell death can also be determined by examining the SBDPs present in the biological sample.
  • calpain and caspase-3 SBDPs can be distinguished, measurement of these markers indicates the type of cell damage in the subject. For example, necrosis-induced calpain activation results in the production of SBDP150 and SBDP145; apoptosis-induced caspase-3 activation results in the production of SBDP150i and SBDP120; and activation of both pathways results in the production of all four markers.
  • the level of or kinetic extent of UCH-Ll present in a biological sample may optionally distinguish mild injury from a more severe injury.
  • severe MCAO (2h) produces increased UCH-Ll in both CSF and serum relative to mild challenge (30 min) while both produce UCH-Ll levels in excess of uninjured subjects.
  • persistence or kinetic extent of the markers in a biological sample is indicative of the severity of the injury with greater injury indicating increases persistence of GFAP, UCH-Ll, or SBDP in the subject that is measured by an inventive process in biological samples taken at several time points following injury.
  • results of such a test can help a physician determine whether the administration a particular therapeutic such as calpain and/or caspase inhibitors or muscarinic cholinergic receptor antagonists might be of benefit to a patient.
  • This method may be especially important in detecting age and gender difference in cell death mechanism.
  • assay grade water such as assay grade water, buffering agents, membranes, assay plates, secondary antibodies, salts, and other ancillary reagents are available from vendors known to those of skill in the art.
  • assay plates are available from Corning, Inc. (Corning, NY) and reagents are available from Sigma-Aldrich Co. (St. Louis, MO).
  • Reagents illustrated herein are commonly cross reactive between mammalian species or alternative reagents with similar properties are commercially available, and a person of ordinary skill in the art readily understands where such reagents may be obtained. Variations within the concepts of the invention are apparent to those skilled in the art.
  • Example 1 Materials for Biomarker Analyses.
  • Illustrative reagents used in performing the subject invention include Sodium bicarbonate (Sigma Cat #: C-3041), blocking buffer (Startingblock T20-TBS) (Pierce Cat#: 37543), Tris buffered saline with Tween 20 (TBST; Sigma Cat #: T-9039). Phosphate buffered saline (PBS; Sigma Cat #: P-3813); Tween 20 (Sigma Cat #: P5927); Ultra TMB ELISA (Pierce Cat #: 34028); and Nunc maxisorp ELISA plates (Fisher).
  • Monoclonal and polyclonal GFAP and UCH-Ll antibodies are made in-house or are obtained from Santa Cruz Biotechnology, Santa Cruz, CA. Antibodies directed to ⁇ -II spectrin and breakdown products as well as to MAP2 are available from Santa Cruz Biotechnology, Santa Cruz, CA. Labels for antibodies of numerous subtypes are available from Invitrogen, Corp., Carlsbad, CA. Protein concentrations in biological samples are determined using bicinchoninic acid microprotein assays (Pierce Inc., Rockford, IL, USA) with albumin standards. All other necessary reagents and materials are known to those of skill in the art and are readily ascertainable.
  • Anti-biomarker specific rabbit polyclonal antibody and monoclonal antibodies are produced in the laboratory. To determine reactivity specificity of the antibodies to detect a target biomarker a known quantity of isolated or partially isolated biomarker is analyzed or a tissue panel is probed by western blot. An indirect ELISA is used with the recombinant biomarker protein attached to the ELISA plate to determine optimal concentration of the antibodies used in the assay. Microplate wells are coated with rabbit polyclonal anti-human biomarker antibody. After determining the concentration of rabbit anti-human biomarker antibody for a maximum signal, the lower detection limit of the indirect ELISA for each antibody is determined.
  • Example 3 In vivo model of TBI injury model:
  • a controlled cortical impact (CCI) device is used to model TBI on rats as previously described (Pike et al, 1998).
  • Adult male (280-300 g) Sprague-Dawley rats (Harlan: Indianapolis, IN) are anesthetized with 4% isoflurane in a carrier gas of 1:1 O 2 /N 2 O (4 min.) and maintained in 2.5% isoflurane in the same carrier gas.
  • Core body temperature is monitored continuously by a rectal thermistor probe and maintained at 37+1 0 C by placing an adjustable temperature controlled heating pad beneath the rats.
  • Animals are mounted in a stereotactic frame in a prone position and secured by ear and incisor bars.
  • a unilateral (ipsilateral to site of impact) craniotomy (7 mm diameter) is performed adjacent to the central suture, midway between bregma and lambda.
  • the dura mater is kept intact over the cortex.
  • Brain trauma is produced by impacting the right (ipsilateral) cortex with a 5 mm diameter aluminum impactor tip (housed in a pneumatic cylinder) at a velocity of 3.5 m/s with a 1.6 mm compression and 150 ms dwell time. Sham-injured control animals are subjected to identical surgical procedures but do not receive the impact injury.
  • Example 4 Middle cerebral artery occlusion (MCAO) injury model: [0083] Rats are incubated under isoflurane anesthesia (5% isoflurane via induction chamber followed by 2% isoflurane via nose cone), the right common carotid artery (CCA) of the rat is exposed at the external and internal carotid artery (ECA and ICA) bifurcation level with a midline neck incision. The ICA is followed rostrally to the pterygopalatine branch and the ECA is ligated and cut at its lingual and maxillary branches.
  • MCAO Middle cerebral artery occlusion
  • a 3-0 nylon suture is then introduced into the ICA via an incision on the ECA stump (the suture's path was visually monitored through the vessel wall) and advanced through the carotid canal approximately 20 mm from the carotid bifurcation until it becomes lodged in the narrowing of the anterior cerebral artery blocking the origin of the middle cerebral artery.
  • the skin incision is then closed and the endovascular suture left in place for 30 minutes or 2 hours.
  • the rat is briefly reanesthetized and the suture filament is retracted to allow reperfusion.
  • the filament is advanced only 10 mm beyond the internal-external carotid bifurcation and is left in place until the rat is sacrificed.
  • the brain samples are pulverized with a small mortar and pestle set over dry ice to a fine powder.
  • the pulverized brain tissue powder is then lysed for 90 min at 4 0 C in a buffer of 50 mM Tris (pH 7.4), 5 mM EDTA, 1% (v/v) Triton X-100, 1 mM DTT, Ix protease inhibitor cocktail (Roche Biochemicals).
  • the brain lysates are then centrifuged at 15,000xg for 5 min at 4 0 C to clear and remove insoluble debris, snap-frozen, and stored at - 8O 0 C until used.
  • cleared CSF samples (7 ⁇ l) are prepared for sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) with a 2X loading buffer containing 0.25 M Tris (pH 6.8), 0.2 M DTT, 8% SDS, 0.02% bromophenol blue, and 20% glycerol in distilled H 2 O.
  • SDS-PAGE sodium dodecyl sulfate-polyacrylamide gel electrophoresis
  • 2X loading buffer containing 0.25 M Tris (pH 6.8), 0.2 M DTT, 8% SDS, 0.02% bromophenol blue, and 20% glycerol in distilled H 2 O.
  • Twenty micrograms (20 ⁇ g) of protein per lane are routinely resolved by SDS-PAGE on 10-20% Tris/glycine gels (Invitrogen, Cat #EC61352) at 130 V for 2 hours.
  • PVDF polyvinylidene fluoride
  • Example 6 UCH-Ll is increased in CSF following MCAO challenge.
  • UCH-Ll protein is readily detectable after injury at statically significant levels above the amounts of UCH-Ll in sham treated samples (FIGs. IA, B). These UCH-Ll levels are transiently elevated (at 6 h) after mild ischemia (30 min MCAO) followed by reperfusion, while levels are sustained from 6 to 72 h after a more severe (2 h MCAO) ischemia (FIGs. IA, B).
  • Example 7 ELISA readily identifies UCH-Ll levels in both CSF and serum.
  • ELISA is used to more rapidly and readily detect and quantitate UCH-Ll in biological samples.
  • a UCH-Ll sandwich ELISA 96-well plates are coated with 100 ⁇ l/well capture antibody (500 ng/well purified rabbit anti-UCH-Ll, made in-house by conventional techniques) in 0.1 M sodium bicarbonate, pH 9.2. Plates are incubated overnight at 4 0 C, emptied and 300 ⁇ l/well blocking buffer (Startingblock T20-TBS) is added and incubated for 30 min at ambient temperature with gentle shaking.
  • biotinyl-tyramide solution (Perkin Elmer Elast Amplification Kit) is added for 15 min at room temperature, washed then followed by 100 ⁇ l/well streptavidin-HRP (1:500) in PBS with 0.02% Tween-20 and 1% BSA for 30 min and then followed by washing. Lastly, the wells are developed with lOO ⁇ l/well TMB substrate solution (Ultra- TMB ELISA, Pierce# 34028) with incubation times of 5-30 minutes. The signal is read at 652 nm with a 96-well spectrophotometer (Molecular Device Spectramax 190).
  • UCH-Ll levels of the TBI group are significantly higher than the sham controls (p ⁇ 0.01, ANOVA analysis) and the na ⁇ ve controls as measured by a swELISA demonstrating that UCH-Ll is elevated early in CSF (2h after injury) then declines at around 24 h after injury before rising again 48 h after injury (FIG. 2).
  • FIG. 3 The more severe 2 h MCAO group UCH-Ll protein levels are 2-5 fold higher than 30 min MCAO (p ⁇ 0.01, ANOVA analysis).
  • UCH-Ll protein levels for shams are virtually indistinguishable from na ⁇ ve controls.
  • Similar results are obtained for UCH-Ll in serum.
  • Blood (3-4 ml) is collected at the end of each experimental period directly from the heart using syringe equipped with 21 gage needle placed in a polypropylene tube and allowed to stand for 45 min to 1 hour at room temperature to form clot. Tubes are centrifuged for 20 min at 3,000xg and the serum removed and analyzed by ELISA (FIGS. 4, 5).
  • UCH-Ll levels of the TBI group are significantly higher than the sham group (p ⁇ 0.001, ANOVA analysis) and for each time point tested 2 h through 24 h respective to the same sham time points (p ⁇ 0.005, Student's T-test).
  • UCH-Ll is significantly elevated after injury as early as 2h in serum.
  • Severe MCAO challenge produces increased serum UCH-Ll relative to mild challenge. Both mild and severe challenge are statistically higher than sham treated animals indicating that serum detection of UCH-Ll is a robust diagnostic and the levels are able to sufficiently distinguish mild from severe injury.
  • FIG. 6 demonstrates that levels of SBDP145 in both serum and CSF are significantly (p ⁇ 0.05) increased at all time points studied following severe (2hr) MCAO challenge relative to mild (30 min) challenge.
  • SBDP120 demonstrates significant elevations following severe MCAO challenge between 24 and 72 hours after injury in CSF (FIG. 7).
  • levels of SBDP120 in serum are increased following severe challenge relative to mild challenge at all time points between 2 and 120 hours.
  • both mild and severe MCAO challenge produces increased SPBP120 and 140 relative to sham treated subjects.
  • Example 9 Analysis of MAP2:
  • Microtubule Associated Protein 2 (MAP2) is assayed as a biomarker in both CSF and serum following mild (30 min) and severe (2 hr) MCAO challenge in subjects by ELISA or western blotting essentially as described herein.
  • Antibodies to MAP2 (MAP-2 (E-12)) are obtained from Santa Cruz Biotechnology, Santa Cruz, CA. These antibodies are suitable for both ELISA and western blotting procedures and are crossreactive to murine and human MAP2.
  • a control group A synonymously detailed as CSF controls, included 10 individuals also being over the age of 18 or older and no injuries. Samples are obtained during spinal anesthesia for routine surgical procedures or access to CSF associated with treatment of hydrocephalus or meningitis.
  • a control group B synonymously described as normal controls, totaled 64 individuals, each age 18 or older and experiencing multiple injuries without brain injury. Further details with respect to the demographics of the study are provided in Table 1.
  • FIGs. 9 and 10 The level of biomarkers found in the first available CSF and serum samples obtained in the study are provided in FIGs. 9 and 10, respectively.
  • the average first CSF sample collected as detailed in FIG. 9 was 11.2 hours while the average time for collection of a serum sample subsequent to injury event as per FIG. 10 is 10.1 hours.
  • the quantity of each of the biomarkers of UCH-Ll, MAP2, SBDP145, SBDP120, and GFAP are provided for each sample for the cohort of traumatic brain injury sufferers as compared to a control group.
  • the diagnostic utility of the various biomarkers within the first 12 hours subsequent to injury based on a compilation of CSF and serum data is provided in Fig.11 and indicates in particular the value of GFAP as well as that of additional markers UCH-Ll and the spectrin breakdown products. Elevated levels of UCH-Ll are indicative of the compromise of neuronal cell body damage while an increase in SPDP 145 with a corresponding decrease in SBDP 120 is suggestive of acute axonal necrosis.
  • One subject from the traumatic brain injury cohort was a 52 year old Caucasian woman who had been involved in a motorcycle accident while not wearing a helmet. Upon admission to an emergency room her GCS was 3 and during the first 24 hours subsequent to trauma her best GCS was 8.
  • FIG. 12 Arterial blood pressure (MABP), intracranial pressure (ICP) and cerebral profusion pressure (CPP) for this sufferer of traumatic brain injury as a function of time is depicted in FIG. 12.
  • MABP Arterial blood pressure
  • ICP intracranial pressure
  • CPP cerebral profusion pressure
  • FIG. 13 A possible secondary insult is noted at approximately 40 hours subsequent to the injury as noted by a drop in MABP and CPP.
  • the changes in concentration of inventive biomarkers per CSF and serum samples from this individual are noted in FIG. 13.
  • FIG. 13 Another individual of the severe traumatic brain injury cohort included a 51 year old Caucasian woman who suffered a crush injury associated with a horse falling on the individual. GCS on admission to emergency room was 3 with imaging analysis initially being unremarkable with minor cortical and subcortical contusions. MRI on day 5 revealed significant contusions in posterior fossa. The Marshall scale at that point was indicated to be 11 with a Rotterdam scale score of 3. The subject deteriorated and care was withdrawn 10 days after injury. The CSF and serum values for this individual during a period of time are provided in FIG. 14. [0098] Based on the sandwich ELISA testing, GFAP values as a function of time are noted to be markedly elevated relative to normal controls (control group B) as a function of time.
  • Stepwise Regression Analysis 2 - - Cohort includes:
  • Stepwise Regression Analysis 1 - Cohort includes:
  • Stepwise Regression Analysis 2 - Cohort includes:
  • Example 10 The study of Example 10 was repeated with a moderate traumatic brain injury cohort characterized by GCS scores of between 9 and 11, as well as a mild traumatic brain injury cohort characterized by GCS scores of 12-15. Blood samples were obtained from each patient on arrival to the emergency department of a hospital within 2 hours of injury and measured by ELISA for levels of GFAP in nanograms per milliliter. The results were compared to those of a control group who had not experienced any form of injury. Secondary outcomes included the presence of intracranial lesions in head CT scans. [00103] Over 3 months 53 patients were enrolled: 35 with GCS 13-15, 4 with GCS 9-12 and 14 controls. The mean age was 37 years (range 18-69) and 66% were male.
  • the mean GFAP serum level was 0 in control patients, 0.107 (0.012) in patients with GCS 13-15 and 0.366 (0.126) in GCS 9-12 (P ⁇ 0.001). The difference between GCS 13-15 and controls was significant at P ⁇ 0.001. In patients with intracranial lesions on CT GFAP levels were 0.234 (0.055) compared to 0.085 (0.003) in patients without lesions (P ⁇ 0.001). There is a significant increase in GFAP in serum following a MTBI compared to uninjured controls in both the mild and moderate groups. GFAP was also significantly associated with the presence of intracranial lesions on CT.
  • FIG. 16 shows GFAP concentration for controls as well as individuals in the mild/moderate traumatic brain injury cohort as a function of CT scan results upon admission and 24 hours thereafter. Simultaneous assays were performed in the course of this study for UCH-Ll biomarker.
  • the UCH-Ll concentration derived from the same samples as those used to determine GFAP is provided FIG. 17.
  • the concentration of UCH-Ll and GFAP as well as a biomarker not selected for diagnosis of neurological condition, SlOOb, is provided as a function of injury magnitude between control, mild, and moderate traumatic brain injury as shown in FIG. 18.
  • FIG. 19 shows the concentration of the same markers as depicted in FIG. 18 with respect to initial evidence upon hospital admission as to lesions in tomography scans illustrating the high confidence in predictive outcome of the inventive process.
  • FIG. 20 shows that both NSE and MAP2 are elevated in subjects with MTBI in serum both at admission and at 24 hours of follow up.
  • biomarkers such as UCH-Ll, GFAP, NSE, and MAP2
  • rapid and quantifiable determination as to the severity of the brain injury is obtained consistent with GSC scoring and CT scanning yet in a surprisingly more quantifiable, expeditious and economic process.
  • biomarkers indicative of neurological condition the nature of the neurological abnormality is assessed and in this particular study suggestive of neuronal cell body damage.
  • gender variations are noted suggesting a role for hormonal antiinflammatories as therapeutic candidates.
  • a receiver operating characteristic (ROC) modeling of UCH-Ll, GFAP and SBDP145 post TBI further supports the value of simultaneous measurement of these biomarkers, as shown in Figs. 21, 22.
  • GFAP brain biomarkers
  • Patent documents and publications mentioned in the specification are indicative of the levels of those skilled in the art to which the invention pertains. These documents and publications are incorporated herein by reference to the same extent as if each individual document or publication was specifically and individually incorporated herein by reference. [00108] The foregoing description is illustrative of particular embodiments of the invention, but is not meant to be a limitation upon the practice thereof. The following claims, including all equivalents thereof, are intended to define the scope of the invention.

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