EP2313775A2 - Lyse in situ de cellules dans des analyses immunologiques à écoulement latéral - Google Patents

Lyse in situ de cellules dans des analyses immunologiques à écoulement latéral

Info

Publication number
EP2313775A2
EP2313775A2 EP09798691A EP09798691A EP2313775A2 EP 2313775 A2 EP2313775 A2 EP 2313775A2 EP 09798691 A EP09798691 A EP 09798691A EP 09798691 A EP09798691 A EP 09798691A EP 2313775 A2 EP2313775 A2 EP 2313775A2
Authority
EP
European Patent Office
Prior art keywords
zone
sample
lysis
conjugate
sample application
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09798691A
Other languages
German (de)
English (en)
Other versions
EP2313775A4 (fr
Inventor
Robert W. Vandine
Uma Mahesh Babu
Robert P. Sambursky
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rapid Pathogen Screening Inc
Original Assignee
Rapid Pathogen Screening Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US12/502,662 external-priority patent/US8614101B2/en
Priority claimed from US12/502,626 external-priority patent/US8669052B2/en
Application filed by Rapid Pathogen Screening Inc filed Critical Rapid Pathogen Screening Inc
Publication of EP2313775A2 publication Critical patent/EP2313775A2/fr
Publication of EP2313775A4 publication Critical patent/EP2313775A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
    • G01N33/54366—Apparatus specially adapted for solid-phase testing
    • G01N33/54386—Analytical elements
    • G01N33/54387—Immunochromatographic test strips
    • G01N33/54388—Immunochromatographic test strips based on lateral flow
    • 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
    • G01N33/558—Immunoassay; Biospecific binding assay; Materials therefor using diffusion or migration of antigen or antibody
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
    • C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
    • C12Q1/6813—Hybridisation assays
    • C12Q1/6834—Enzymatic or biochemical coupling of nucleic acids to a solid phase

Definitions

  • the invention pertains to the field of lateral flow immunoassays. More particularly, the invention pertains to in situ lysis of samples in lateral flow immuonassays.
  • Lateral flow immunoassays combine the reagents and the process steps of more general immunoassays into an improved assay. This enables single-step, point-of care testing (POCT) and provides a sensitive and rapid means for detection of target molecules. Lateral flow immunoassays are available for a wide array of target analytes and can be designed for sandwich or competitive test formats. Generally high molecular weight analytes with several epitopes are analyzed in a sandwich format whereas small molecules representing only one epitope are detected by means of a competitive assay. The first lateral flow assays tested for human chorionic gonadotropin (hCG). Today commercially available tests monitor ovulation, detect infectious disease organisms, analyze drugs of abuse and measure other analytes important to human physiology. Products have also been introduced for veterinary testing, environmental testing, and product monitoring.
  • hCG human chorionic gonadotropin
  • U.S. Patent 5,714,341 discloses a lateral flow immunoassay for HIV specific antibodies in saliva samples. A saliva sample is diluted in a sample buffer, and a lateral flow immunoassay is dipped into the diluted saliva sample, again enabling point-of-care testing with rapid results.
  • German Patent DE19622503 discloses a lateral flow immunoassay for illegal narcotics in saliva and sweat.
  • fever is a common cause of childhood visits to urgent care centers for both family practice and pediatric offices. Most commonly, this relates to either a respiratory infection or gastroenteritis. The high incidence of fever in children and the precautious administration of unnecessary antibiotics is reason to develop a rapid screening test for biomarkers that distinguish viral from bacterial infections.
  • a viable and efficient assay may need to include a lysis step designed to make an antigen accessible, either by breaking up a complex to unmask components or by removing barriers such as a cell wall, a membrane of a cell or organelle, or a coat of a virus.
  • a lysis step designed to make an antigen accessible, either by breaking up a complex to unmask components or by removing barriers such as a cell wall, a membrane of a cell or organelle, or a coat of a virus.
  • barriers such as a cell wall, a membrane of a cell or organelle, or a coat of a virus.
  • one approach in the immunoassay field is to lyse the complex or barrier and extract the analyte of interest prior to performing the immunoassay.
  • the barrier is a cell wall or cell membrane
  • the cells can be erythrocytes, leukocytes, epidermal, viral, fungal or bacterial, and they can be normal or malignant.
  • a required lysis step is accomplished prior to and physically separate from the desired immunoassay, as a sample preparation step.
  • the present invention includes devices and methods that incorporate lysis agents into a point- of-care testing device so that lysis does not need to be conducted as a separate step.
  • the lysis step is performed on the test strip itself, as an integral part of the sample analysis device.
  • Figure 1 shows a sample analysis device that may be used in embodiments of the present invention.
  • Figure 2 shows a housing containing the strip of Figure 1.
  • Figure 3 shows a collection device for collecting a sample.
  • Figure 4 shows a test kit including the sample analysis device of Figures 1 and 2 and the collection device of Figure 3.
  • Figure 5A shows a sample analysis device including a lysis zone located between a sample application zone and a conjugate zone in an embodiment of the present invention.
  • Figure 5B shows a sample analysis device including a lysis zone overlapping a sample application zone in an embodiment of the present invention.
  • Figure 5 C shows a sample analysis device including a lysis zone overlapping a conjugate zone in an embodiment of the present invention.
  • Figure 5D shows a sample analysis device including a lysis zone overlapping a sample application zone and a conjugate zone in an embodiment of the present invention.
  • Figure 6A shows a sample analysis device including a blocking zone between a sample application zone and a conjugate zone in an embodiment of the present invention.
  • Figure 6B shows a sample analysis device including a blocking zone between a sample application zone and a detection zone in another embodiment of the present invention.
  • Figure 6C shows a sample analysis device including a blocking zone between a sample application zone and a conjugate zone in another embodiment of the present invention.
  • Figure 6D shows a sample analysis device including a blocking zone between a sample application zone and a detection zone in another embodiment of the present invention
  • in situ lysis describes techniques for incorporating lysis agents into a point-of-care testing device, such as a chromatography test strip or other lateral flow immunoassay device, so that the lysis operation is not conducted as a separate step.
  • In situ lysis offers distinct advantages over a separate lysis step. Some of these advantages are: 1. Higher efficiency. Cells that are lysed prior to being transferred onto the device would inherently lower the percentage of recovery. Thus, avoiding an additional transfer step promotes efficiency and sensitivity.
  • blocking zone With a proper "blocking zone,” one can block cell debris or cell bound materials from reaching an assay reaction area. Where an analyte of interest is intra-cellular and a protein associated with a cell wall and other cell debris needs to be blocked, and the assay antibody is protected, then a blocking zone downstream of the lysis agent and upstream of an assay readout may be used to decrease interference.
  • In situ lysis can also be applied to "breaking down of the complexes," whether they are immune complexes or bound materials of some kind. By lysing these complexes in situ, one can then measure the amount of analyte in the complexes.
  • the sample analysis device includes a chromatographic test strip, e.g. a lateral flow or flow through test strip.
  • the test strip includes a sample application zone, a lysis zone, a conjugate zone, and a detection zone.
  • the test strip also optionally includes a waste zone, a control zone, a carrier backing, a housing and an opening in the housing for read out of the result. Any combinations of some or all of these elements may be included in the test strip.
  • Sample analysis in the detection zone may be carried out by standard means, e.g. by an immunological, biochemical or enzymatic detection method.
  • the detection method includes the use of antibodies, nucleic acids, ligands/receptors or nanoparticles capable of specifically binding the targets, e.g. pathogens to be tested and subsequent visualization of the bound entity, e.g. by enzymatic detection or by means of direct labeling groups, such as visible or colored particles, dyes, magnetic particles, fluorescent or phosphorescent particles, chemiluminiscent particles, radioisotopic ligands, enzymes, peptides, amino acids, colloidal particles, or beads, as is well known in the art. Detection of the marker may be achieved in the detection zone.
  • the binding molecule immobilizes the labeled complex or the labeled marker-analogue by immune reaction or other reaction in the detection zone, thus building up a visible test line in the detection zone during the process.
  • the label is an optically detectable label. Forming a complex at the test line concentrates and immobilizes the label and the test line becomes visible to the naked eye, indicating a positive test result.
  • Particularly preferred are direct labels, and more particularly gold labels which can be best recognized by the naked eye.
  • an electronic read out device e.g.
  • a photometrical, acoustic, impedimetrical, potentiometric and/or amperometric transducer can be used to obtain more precise results and a semi-quantification of the analyte.
  • Other labels may be latex, fluorophores, or phosphorophores .
  • this invention includes a device and test kit for the performance of the described method.
  • the specific binding partners for the analytes in the sample are monoclonal, polyclonal, single domain or recombinant antibodies, or fragments of antibodies capable of binding to a pathogen.
  • the specific binding partners may also be antigens capable of binding to antibodies against a pathogen or an allergen.
  • Other types of binding partners include, but are not limited to, bioorganic macromolecules like aptamers or ligands/receptors, nanoparticles, or nucleic acids.
  • the visual label may be any label visible to the naked eye, including, but not limited to, colored particles such as colloidal gold, dyed latex beads, selenium, or carbon.
  • the visual tags are also coated with fluorescing elements.
  • the fluorescing element is a fluorescing dye.
  • a mixture of preferably colorless fluorescing latex bead conjugates are mixed with colloidal gold (a visible spectrum) conjugates, or conjugates producing a visible read test line, in lateral flow immunoassays to enhance sensitivity of the assay and to aid in visually reading true positives and true negatives.
  • the nanoparticles that may be used include, but are not limited to, selenium, carbon, and colloidal gold.
  • Preferred targets include, but are not limited to, proteins, glycoproteins, proteoglycans, nucleic acids, and lipoproteins.
  • Other preferred targets include, but are not limited to, pathogens, low-molecular-weight compounds, and/or allergy- associated components.
  • the pathogens are preferably selected from viruses, microorganisms, e.g. bacteria, and parasites, e.g. amoebae or nematodes.
  • the allergy-associated components are preferably selected from allergens and anti-allergic components.
  • the sample is a sample of body fluid.
  • the sample of body fluid is preferably taken from a body surface selected from mucosal membrane fluids (preferably of the oral, nasal, vaginal, and ocular cavities), blood, urine, tears, cerebrospinal fluid, secretions from glands and secretions from lesions or blisters, e.g. lesions or blisters on the skin. More preferably, the sample is selected from oral, nasal, ocular, genital and rectal fluid, secretions from skin lesions or blisters, CSF (cerebral spinal fluid), and exudates.
  • the body fluid samples are preferably fluids that do not flow once collected.
  • U.S. Published Patent Application No. 2005/0175992 discloses a method for detecting targets, such as pathogens and/or allergy-associated components, in a human body fluid where the body fluid sample is collected by a collection device, such as a swab member. The samples are transferred from the swab member to a sample analysis device, on which an analysis of the targets can occur by immunochemical or enzymatic means. The test result is capable of being displayed within a very short period of time and can be directly read out by the user. This enables point-of-care testing with results available during a patient visit.
  • the inventions disclosed in this copending application are particularly advantageous for the diagnosis of conjunctivitis.
  • the chromatographic test strip shown in Figures 1 through 4 includes a plurality of different strip materials.
  • the device preferably includes an absorbent pad (1), an application zone (2), a detection zone (3), and a waste zone (4).
  • the strip materials are arranged on an adhesive plastic backing (5).
  • the absorbent pad (1) is provided in this example for adding an elution medium in order to facilitate the transfer of the sample to the detection zone (3).
  • US Published Patent Application No. 2007/0059682 describes methods to increase specificity of lateral flow immunoassays. These methods could also be used in combination with the embodiments described herein.
  • Figure 2 shows a housing (6), which is preferably plastic, containing the strip as shown in Figure 1.
  • a sample application window (7) brings a collection device into contact with the strip.
  • the test result is displayed in the read out window (8).
  • Figure 3 shows the collection device for collecting a sample.
  • the collection device is a swab member.
  • the collection device includes a body (9), which is preferably plastic, with a sample collection material (11) fixed on it and an opening (10) corresponding to a read out window when the collection device is operatively in contact with a test strip.
  • Figure 4 shows a test kit, which includes the sample analysis device of Figures 1 and 2 and the collection device of Figure 3.
  • the methods and devices of the present invention incorporate a lysis zone including at least one lysis agent as part of a lateral flow immunoassay test strip, such as those shown in Figures 1 through 4, or other lateral flow immunoassay devices known in the art, in order to lyse the sample material in situ.
  • a lysis zone including at least one lysis agent as part of a lateral flow immunoassay test strip, such as those shown in Figures 1 through 4, or other lateral flow immunoassay devices known in the art, in order to lyse the sample material in situ.
  • the present invention is suitable for various methods for loading the sample.
  • the assay will either be started directly when sample is transferred in a sufficient volume of liquid, such as a body fluid, or the process may require that a sample be added to or eluted by a sample transport liquid (e.g. tap water or a buffer solution).
  • a sample which has been collected, such as by a swab is transferred directly onto the sample application zone of a test strip.
  • a sample transport liquid is then added to the test strip.
  • a liquid sample is deposited directly onto the sample application zone of a test strip. In this embodiment, the liquid sample itself, if of sufficient volume, becomes the transport liquid.
  • a sample transport liquid is additionally added.
  • a liquid sample is pre-mixed with the sample transport liquid and then both are applied to the test strip together. Following sample loading, sample traveling with the transport liquid will encounter the lysis agent.
  • the lysis agent will have been pre-loaded onto the test strip and is eluted by the transport liquid.
  • the lysis agent has been dried into the test strip.
  • the lysis agent may be pre-dried by freeze drying or lyophilizing and then pre-loaded into the test strip.
  • the lysis agent may be absorbed, adsorbed, embedded or trapped on the test strip.
  • the lysis agent is localized between the sample application zone and the conjugate zone.
  • the lysis agent is preferably soluble or miscible in the sample transport liquid, and the lysis agent is solubilized and activated upon contact with the sample transport liquid.
  • the sample transport liquid then contains both lysis agent in solution or suspension and sample components in suspension. Any lysis-susceptible components in the sample, then being exposed in suspension to the lysis agent, are themselves lysed in situ.
  • the running buffer then carries the analyte, including any lysis-freed components, through the conjugate zone and to the detection zone.
  • the location where the lysis agent is pre-loaded can be varied as needed.
  • the dried, absorbed, adsorbed, embedded, or trapped lysis agent may be located in or just downstream of the sample application zone.
  • the lysis agent may be located closer to the conjugate zone.
  • the concentration of lysis agent pre-loaded onto a test strip is preferably between 0.001% and 5% weight/volume.
  • the volume to be pre-loaded depends on where the lysis agent is pre-loaded. Appropriate ranges are 1 to 10 microliters when pre-loaded into the sample collector fleece (the sample application zone) or 5 to 50 microliters when pre-loaded into the absorbent pad or into other locations within the test strip. Ideally, the amount preloaded should be approximately 3 microliters pre-loaded into the sample collector fleece or approximately 10 microliters pre-loaded into the absorbent pad or into other locations within the test strip.
  • pH and ionic strength are key to the lysing environment. As to pH established by the lysis agent, a pH below 4.0 tends to precipitate materials, especially proteins. Higher pH, above approximately 10.0, tends to lyse materials such as proteins and cells walls. Therefore, a pH of approximately 10.0 or above is preferable for many applications. Alternatively, lower pH may be preferred for nucleic acid targets.
  • both high and low ionic strength may be used to lyse.
  • a lower ionic strength (hypotonic) tends to break up erythrocytes.
  • Water by itself can lyse erythrocytes.
  • Higher ionic strength environments may be used to rupture certain cell walls and membranes.
  • lysis agents they may be grouped and selected based on their properties: salts, amphoteric and cationic agents, ionic and non-ionic detergents.
  • the salt Ammonium Chloride (NH 4 Cl), lyses erythrocytes.
  • Other salts including, but not limited to, high concentrations of Sodium Chloride (NaCl) and Potassium Chloride (KCl), may rupture certain cell walls and membranes.
  • Other lysis agents are amphoteric agents including, but not limited to, Lyso PC, CHAPS, and Zwittergent.
  • cationic agents including, but not limited to, C16 TAB and Benzalkonium Chloride may be used as a lysis agent.
  • ionic and non-ionic detergents are often used to break or lyse the cell wall or cell membrane components such as lipoproteins and glycoproteins.
  • Common ionic detergents include, but are not limited to, SDS, Cholate, and Deoxycholate. Ionic detergents are good solubilizing agents. Antibodies retain their activity in 0.1% SDS or less.
  • Common non-ionic detergents include, but are not limited to, Octylglucoside, Digitonin, C12E8, Lubrol, Triton X-100, Noniodet P-40, Tween 20, and Tween 80.
  • Non-ionic and mild ionic detergents are weaker denaturants and often are used to solubilize membrane proteins such as viral surface proteins.
  • Additional lysis agents include, but are not limited to, urea and enzymes. Combinations of different lysis agents may be used to optimize the lysing environment.
  • Surfactants are generally wetting agents and lower the surface tension of a liquid. This then allows easier spreading by lowering the interfacial tension between liquids. So, surfactants can interfere with the natural binding of antigen and antibody or ligand and receptors.
  • the concentrations are, therefore, experimentally chosen for each class of lysis agent. Once lysis occurs, it is important that the desired binding reactions not be hindered. Generally, 0.001% lysis agent concentration is considered the lower limit, and the upper limit is approximately 1%. There is an additive or synergistic effect when combinations of lysis agents are used. This expands the working range of concentration to run from approximately 0.001% to 1%. Finally, some undesirable non-specific binding may be prevented at a Tween 20 concentration of 5%. In all cases, the total amount of lysis agent pre-loaded onto all locations of an individual test strip must be sufficient to lyse barriers to immunodetection, permitting practical operation of the test strip.
  • the lysis agent itself should not interfere with any other assay detector or indicator agents and thus does not interfere with any other assay interactions and reactions to such an extent as to prevent practical operation of the assay.
  • a lysis agent should have sufficient shelf life to allow manufacture, distribution and storage before use of a test strip in point-of-care testing.
  • the lateral flow immunoassay device of the present invention includes a sample-transporting liquid, which can be a buffer, and a chromatography test strip containing one or several fleece materials or membranes with capillary properties through which sample flows.
  • a sample-transporting liquid which can be a buffer
  • a chromatography test strip containing one or several fleece materials or membranes with capillary properties through which sample flows.
  • the sample is applied to the application zone (201) on a chromatography test strip (200).
  • the sample passes a lysis zone (250), where a lysis agent will have preferably been pre-loaded onto the test strip and is eluted by the transport liquid.
  • the lysis agent lyses any lysis-susceptible components in the sample in situ.
  • the chromatographic test strip contains a sample application zone (201), a lysis zone (250) containing a lysis agent, and a conjugate zone (260) containing at least one labeled binding partner that is eluted by and then able to migrate with a sample transport liquid (e.g. a buffer solution).
  • a sample transport liquid e.g. a buffer solution.
  • the labeled binding partner is capable of specifically binding to an analyte of interest to form a conjugate which in turn is capable of specifically binding to another specific reagent or binding partner in the detection zone.
  • an absorbent pad similar to the absorbent pad (1) shown in Figure 1, as well as other known lateral flow immunoassay components including, but not limited to, a waste zone, a carrier backing, a housing and an opening in the housing for result read out may optionally also be a component of the test strip (200) in this embodiment.
  • the lysis agent is localized in the lysis zone (250) between the sample application zone (201) and the conjugate zone (260).
  • the lysis agent is preferably soluble or miscible in the sample transport liquid, and the lysis agent is solubilized and activated upon contact with the sample transport liquid.
  • the sample transport liquid then contains both lysis agent in solution or suspension and sample components in suspension. Any lysis-susceptible components in a sample, then being exposed in suspension to the lysis agent, are themselves lysed in situ.
  • the running buffer then carries the analyte, including any lysis-freed components, to the detection zone (205).
  • the lysis zone (250) is preferably located between the sample application zone (201) and the conjugate zone (260), as shown in Figure 5A. In other embodiments, the lysis zone (250) overlaps the sample application zone (201), the conjugate zone (260) or both the sample application zone (201) and the conjugate zone (260) as shown in Figures 5B, 5C, and 5D, respectively. Note that the figures are schematic, and are not drawn to scale. The amount of overlap between the different zones (as shown in Figures 5B through 5D) may be highly variable.
  • the test strip (200) also includes a detection zone (205) containing a first section for detection of a first analyte, e.g. a test line (202), including an immobilized specific binding partner, complimentary to the conjugate formed in and arriving from the conjugate zone (260).
  • a detection zone binding partners trap the labeled binding partners from the conjugate zone (260) along with their bound analytes. This localization of the analytes with their labeled binding partners gives rise to an indication at the test line (202).
  • the presence of an analyte is determined by qualitative and/or quantitative readout of the test line (202) indication resulting from the accumulation of labeled binding partners.
  • the detection zone (205) may contain further test lines to detect other analytes, as well as a control line (204).
  • the control line (204) indicates that the labeled specific binding partner traveled through the length of the assay, even though it may not have bound any analyte, thus confirming proper operation of the assay.
  • the control zone (204) is preferably downstream of the test zone (202). However, in other embodiments, the control zone (204) may be located upstream of the test zone (202).
  • control line (204) includes an antibody or other recombinant protein which binds to a component of the elution medium or other composition being used in the test.
  • the control line (204) preferably includes a nucleic acid complementary to the labeled nucleic acid being used as a binding partner for the target nucleic acid.
  • the presence of each target preferably corresponds to a separate test line (202).
  • the presence of multiple targets may be indicated on the same test line such that the presence of more than one target has different characteristics than the presence of a single target. For example, the presence of multiple targets on the same test line may be visually indicated by a different color than the presence of each of the targets alone.
  • the conjugate zone may be upstream of the sample application zone.
  • a lysing enzyme in the running buffer can "target" its substrate and cut it to open up the cell wall.
  • penicillin can excise or "punch a hole” in a susceptible bacteria.
  • the conjugate zone may be upstream of the sample application zone.
  • a barrier may be disposed in a "blocking zone" between the sample application zone and either the conjugate zone or the detection zone, preferably before the conjugate zone.
  • the lysis agent is pre-loaded in the sample application zone or between the sample application zone and the barrier.
  • the barrier serves to slow or arrest those lysed materials effectively larger than the porosity of the barrier while permitting effectively smaller materials to pass more easily.
  • the barrier provides a filtering effect and reduces interference with binding interactions in the conjugate and detection zones. Selection of a specific barrier material depends on the analyte and the assay.
  • a blocking zone barrier may be physical or biological.
  • physical barriers include glass fiber matrices which inherently bind or trap erythrocytes and their cellular debris.
  • Other physical matrices may be "sieve-type" matrices, as in a filtering system, where the small pore size blocks passage of cells but does allow passage of biomarkers.
  • biological barriers are immobilized biological materials that specifically bind to ligands or receptors on a cell surface, preventing the cells from flowing further. Examples include antibodies, recombinant proteins, specific lectins, and receptors/ligands. Biological materials may also be combined into physical barriers such as glass fiber membranes.
  • Figures 6A through 6D show a barrier disposed in a "blocking zone" (170) between the sample application zone (101) and either the conjugate zone (160) ( Figures 6A and 6C) or the detection zone (105) ( Figures 6B and 6D) of the test strip (100).
  • the lysis zone (150) either overlaps with the sample application zone (101) such that the lysis agent is pre-loaded in the sample application zone (101) (see Figures 6C and 6D) or the lysis zone (150) is located between the sample application zone (101) and the barrier in the blocking zone (170) such that the lysis agent is pre-loaded between the sample application zone (101) and the blocking zone (170) (see Figures 6A and 6B).
  • the barrier provides a filtering effect and reduces interference with binding interactions in the conjugate (160) and detection zones (105). Selection of a specific barrier material depends on the analyte and the assay. Similar to Figures 5A through 5D, the detection zone (105) includes at least one test zone (102) and a control zone (104).
  • the analytical tests discussed herein preferably permit a result while the patient is still being examined by the practitioner.
  • the results of the tests are preferably determined within 20 minutes of transferring the sample to the device.
  • the test result is obtained in 10 minutes or less after applying the sample to the device, and it is preferably read at approximately 10 minutes.
  • a readout of the test zone preferably a test line is visible within approximately 1-5 minutes.
  • the devices and methods of the present invention detect nucleic acids in a sample without the use of an amplification step for the target nucleic acid. In some embodiments, the detected nucleic acids are also quantified.
  • the lateral flow detector may be used to detect a target nucleic acid sequence associated with any target virus, bacterium, fungus, or other pathogen, any genetic deficiency, or any other target nucleic acid in a sample.
  • the target nucleic acid may be any nucleic acid including, but not limited to, DNA, an oligonucleotide, messenger RNA, or any other type of RNA.
  • the assay is preferably run within a matter of minutes to a few hours after the sample is obtained, but the assay may be run at a later time such as at least 24 hours after obtaining the sample.
  • the flow of the transport liquid in the detector may be gravity-dependent or as a result of capillary action or surface tension.
  • the transport liquid may be applied by dipping the test strip in the transport liquid or the transport liquid may be contained in a test housing for the test strip.
  • a lateral flow nucleic acid detector in these embodiments may be uniplanar with a single sheet on a test strip for the detection zone.
  • the detector may be multiplanar with multiple detection zones on multiple sheets in fluid communication for simultaneous assays for the same or different target nucleic acids from the same or different samples.
  • a sample for testing in these embodiments may be any sample expected to potentially include a target nucleic acid including, but not limited to, saliva, tears, cerebral spinal fluid, skin lesions, vaginal fluid, penile fluid, mucus, tissue, blood, urine, an environmental water sample, and a soil sample.
  • a denaturant or lysis agent in situ to the sample in order to make the nucleic acids in the sample accessible to the first and second complexes.
  • the denaturant or lysis agent is preferably pre-loaded onto a zone of the test strip so that the sample may be applied directly to the test strip without a step of adding denaturant or lysis agent.
  • the denaturant or lysis agent is pre-loaded onto the test strip in a location so that it frees the nucleic acids prior to the sample reaching the first complex on the test strip.
  • the denaturant or lysis agent is preferably soluble or miscible in the transport liquid and located in the sample application zone or between the sample application zone and the zone where the first complex is pre-loaded.
  • the sensitivity of visually read lateral flow immunoassay tests is enhanced by adding a small quantity of fluorescing dye or fluorescing latex bead conjugates to the initial conjugate material.
  • fluorescing dye or fluorescing latex bead conjugates When the visible spectrum test line is visibly present, the test result is observed and recorded.
  • a light of an appropriate spectrum such as a UV spectrum, is cast on the test line to excite and fluoresce the fluorescing latex beads which are bound in the test line to enhance the visible color at the test line.
  • the present invention provides a lateral flow assay that uses the lysis zone to help differentiate viral and bacterial infections.
  • a lysis agent improves assay efficiency is in assaying for the presence of Human MxA, a 78 kDa protein which accumulates in the cytoplasm as a response to viral infection. The presence of this protein can help to distinguish between bacterial and viral infection in febrile children.
  • In situ lysis using a combination of 1% to 6% weight/volume CHAPS and 0.5% to 2% weight/volume NP40 as the lysis agent improves detection of MxA in fresh or frozen whole blood.
  • a combined point of care diagnostic device tests markers for both viral and bacterial infection, and can effectively assist in the rapid differentiation of viral and bacterial infections, for example at the outpatient office or during an urgent care visit. This ability can dramatically reduce health care costs by limiting misdiagnosis and the subsequent overuse of antibiotics. Such a practice may limit antibiotic allergies, adverse events, and antibiotic resistance. The rapid result obtained from the test also permits a result while the patient is still being examined by the practitioner.
  • the marker for viral infection is MxA and the marker for bacterial infection is C-reactive protein (CRP).
  • CRP C-reactive protein
  • High MxA protein levels are strongly correlated with systemic viral infection and increased CRP is more associated with bacterial infections.
  • the present invention includes a rapid infectious screening test for identifying MxA and CRP in samples.
  • MxA is present in leukocytes (white blood cells). Therefore, the sample can be taken anywhere leukocytes are available, for example in a peripheral blood sample, nasopharyngeal aspirates, tears, spinal fluid, and middle ear aspirates.
  • markers for viral infection and/or bacterial infection may be used.
  • LCMV Lymphocytic Choriomeningitis Virus
  • Major transcription changes have been given preliminary confirmation by quantitative PCR and protein studies and are potentially valuable candidates as biomarkers for arenavirus disease.
  • markers for bacterial infection include, but are not limited to, procalcitonin, urinary trypsin inhibitor (uTi) , lipopolysaccharide, IL-I, IL-6, IL-8, IL-10, ESR and an elevated WBC count (increased bands), Lactate, Troponin, vascular endothelial growth factor, platelet derived growth factor, Cortisol, proadrenomedullin, macrophage migratory inhibitory marker, activated protein C, CD 4,8,13,14, or 64, caspase, placenta derived growth factor, calcitonin gene-related peptide, high mobility group 1, copeptin, naturietic peptides, lipopolysaccharide binding protein, tumor necrosis factor alpha, circulating endothelial progenitor cells, complement 3a, and triggering receptor expresssed on myeloid cells (trem-1).
  • UTTi urinary trypsin inhibitor
  • lipopolysaccharide
  • the infections being distinguished are respiratory infections.
  • other types of infections which can be bacterial or viral, are differentiated using the system of the present invention.
  • Some examples include, but are not limited to, encephalitis, meningitis, gastroenteritis, febrile respiratory illness (including bronchitis, pharyngitis, pneumonia), sinusitis, otitis media, urinary tract infections, and conjunctivitis.
  • lysis agents are dried onto the sample application zone of a lateral flow strip.
  • the lysis agent is made of approximately 2 microliters of 100 mM HEPES buffer (pH 8.0) containing 5% CHAPS and 2% NP-40 with 150 mM Sodium Chloride, 0.1% BSA, and 0.1% Sodium Azide (all percentages weight/volume).
  • HEPES buffer pH 8.0
  • CHAPS 5% CHAPS
  • NP-40 150 mM Sodium Chloride
  • BSA 0.1% BSA
  • Sodium Azide all percentages weight/volume
  • MxA protein is released from inside white blood cells to react with an MxA monoclonal antibody on a visual tag (colloidal gold or visible latex beads).
  • This complex traverses with a running buffer containing Triton X-100 and is captured by MxA monoclonal antibodies immobilized at the test line of the nitrocellulose membrane. This binding at the test line gives rise to a visible indication.

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Abstract

L'invention concerne des dispositifs et des procédés qui incorporent des agents de lyse dans un dispositif d'analyse de point d'intervention. L'échantillon est chargé, et ensuite l'échantillon se déplace jusqu'à ce qu'il rencontre un agent de lyse. L'agent de lyse est de préférence préchargé sur un dispositif de collecte. Dans un mode de réalisation préféré, l'agent initialement de lyse est situé entre la zone d'application d'échantillon et la zone conjuguée. L'agent de lyse est de préférence soluble ou miscible dans le liquide de transport d'échantillon, et l'agent de lyse est solubilisé et activé au contact du liquide de transport d'échantillon.  Le liquide de transport d'échantillon contient ensuite à la fois l'agent de lyse en solution ou en suspension et les composants de l'échantillon en suspension.  Tous les composants susceptibles d'une lyse dans un échantillon, étant ensuite exposés en suspension à l'agent de lyse sont eux-mêmes lysés in situ. Le tampon dynamique transporte ensuite l'analyte, y compris tous les composants libérés par lyse, vers la zone de détection.
EP09798691A 2008-07-15 2009-07-15 Lyse in situ de cellules dans des analyses immunologiques à écoulement latéral Withdrawn EP2313775A4 (fr)

Applications Claiming Priority (6)

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US8087908P 2008-07-15 2008-07-15
US9893508P 2008-09-22 2008-09-22
US17905909P 2009-05-18 2009-05-18
US12/502,662 US8614101B2 (en) 2008-05-20 2009-07-14 In situ lysis of cells in lateral flow immunoassays
US12/502,626 US8669052B2 (en) 2008-06-10 2009-07-14 Lateral flow nucleic acid detector
PCT/US2009/050653 WO2010009206A2 (fr) 2008-07-15 2009-07-15 Lyse in situ de cellules dans des analyses immunologiques à écoulement latéral

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EP09798690A Ceased EP2313527A4 (fr) 2008-07-15 2009-07-15 Détecteur d'acide nucléique à flux latéral

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EP2313527A4 (fr) 2012-11-21
JP5948056B2 (ja) 2016-07-06
WO2010009203A3 (fr) 2010-04-08
EP2313775A4 (fr) 2012-03-14
WO2010009206A2 (fr) 2010-01-21
JP2012503170A (ja) 2012-02-02
JP2011528229A (ja) 2011-11-17
EP2313527A2 (fr) 2011-04-27
WO2010009206A3 (fr) 2010-05-14

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