摘要:
A family of metalloproteinases exist which cleave extracellular matrix molecules. These metalloproteinases are secreted in a latent inactive form and require activation in order to specifically cleave the preferred substrate. A series of peptides have been prepared based on the complete sequence analysis of type IV procollagenase. Peptide inhibitors were synthesized which correspond to cysteine repeat regions and histidine containing regions; the mechanism of action of these peptides involves inhibition of binding of the enzyme to the substrate. Peptide inhibitors were synthesized which correspond to the peptide cleaved off during activation, and constitute a novel class of metalloproteinase inhibitors. These inhibitors are members of a series of peptides which contain the core amino acid sequence RKPRC or analogs thereof. The cysteine residue is required for activity. Affinity purified antibodies directed against specific peptides can be used to a) detect any general metalloproteinase enzyme with the sequence in part VAAHE or PRCGNPD, and distinguish it from other known members of the metalloproteinase family, b) block functional domains resulting in the inhibition of enzyme activity, and c) distinguish latent from activated forms of the enzyme.
摘要:
A family of metalloproteinases exist which cleave extracellular matrix molecules. These metalloproteinases are secreted in a latent inactive form and require activation in order to specifically cleave the preferred substrate. A series of peptides have been prepared based on the complete sequence analysis of type IV Procollagenase. Peptide inhibitors were synthesized which correspond to cysteine repeat regions and histidine containing regions; the mechanism of action of these peptides involves inhibition of binding of the enzyme to the substrate. Peptide inhibitors were synthesized which correspond to the peptide cleaved off during activation, and constitute a novel class of metalloproteinase inhibitors. These inhibitors are members of a series of peptides which contain the core amino acid sequence PRCG. The cysteine residue is required for activity. Affinity purified antibodies directed against specific peptides can be used to a) detect any general metalloproteinase enzyme with the sequence in part VAAHE or PRCGNPD, and distinguish it from other known members of the metalloproteinase family, b) block functional domains resulting in the inhibition of enzyme activity, and c) distinguish latent from activated forms of the enzyme.
摘要:
An assay device for determining the presence of analytes in a cell lysate comprises a porous support member and a plurality of binding reagents arranged and immobilized at multiple reaction sites on the support member. The binding reagents are selected and arranged to assess the status of a selected cellular signal transduction pathway/protein-protein interactive network. In a further aspect, a method for assessing the status of a signal transduction pathway comprises generating a lysate of cells, the lysate retaining one or more pathway molecules present in one or more states and the pathway molecules reflecting signal transduction events taking place in the cells. The method further includes applying the lysate to an immobilized series of binding reagents which can discriminate the pathway molecules and their states. Binding events between the pathway molecules and the binding reagents are identified and the state of the selected signal pathway is determined.
摘要:
A method and device to detect Hepatitis C (HCV) antibodies in oral fluid is provided. This method introduces a non-antibody detection molecule that labels all classes of patient antibodies in oral fluid, followed by the specific concentration of labeled anti-HCV antibodies by selective capture in a trapping zone consisting of peptide antigens derived from the HCV genome. Signal generated by the labeled antibodies present in the trapping zone is proportional to the number of anti-HCV antibodies bound to the antigens present in the trapping zone. Presence of signal derived from the capture of antibody/detection molecule complexes in the trapping zone is indicative of past exposure to HCV.
摘要:
The invention relates to a one-step chemical composition that preserves animal tissue, cells, and biomolecules, such as human tissue, human cells, and biomolecules therein. It improves the fidelity and morphologic structure of cells, organelles, and nuclear chromatin, and maintains and enhances the cellular antigenicity for immunohistochemistry and flow cytometry, while preserving proteins, post-translational modifications of proteins, and nucleic acids. In one embodiment, the composition comprises a) a non-aldehyde precipitating fixative at a concentration below 25% (volume/volume), b) a reversible/cleavable protein cross-linker that targets lipid-associated molecules, and c) a c reversible/cleavable protein cross-linker that targets water soluble molecules. In another embodiment, the composition further includes a kinase inhibitor, a phosphatase inhibitor, and a permeation enhancer. In still another embodiment, the compositions further include lactic acid at a concentration sufficient to maintain cellular nuclear volume at a level equivalent to aldehyde fixation of the same type of cell. In a further embodiment, the composition comprises: a) a precipitating fixative, b) a reversible/cleavable cross-linker, c) a permeation enhancer, d) a kinase inhibitor, e) a phosphatase inhibitor, and f) a carboxylic acid. In a still further embodiment, the invention comprises method for preserving a biological sample by contacting the sample with the composition of the invention under conditions effective for the preservation of the sample.
摘要:
A method and device to detect Hepatitis C (HCV) antibodies in oral fluid is provided. This method introduces a non-antibody detection molecule that labels all classes of patient antibodies in oral fluid, followed by the specific concentration of labeled anti-HCV antibodies by selective capture in a trapping zone consisting of peptide antigens derived from the HCV genome. Signal generated by the labeled antibodies present in the trapping zone is proportional to the number of anti-HCV antibodies bound to the antigens present in the trapping zone. Presence of signal derived from the capture of antibody/detection molecule complexes in the trapping zone is indicative of past exposure to HCV.
摘要:
A method and device to detect Hepatitis C (HCV) antibodies in oral fluid is provided. This method introduces a non-antibody detection molecule that labels all classes of patient antibodies in oral fluid, followed by the specific concentration of labeled anti-HCV antibodies by selective capture in a trapping zone consisting of peptide antigens derived from the HCV genome. Signal generated by the labeled antibodies present in the trapping zone is proportional to the number of anti-HCV antibodies bound to the antigens present in the trapping zone. Presence of signal derived from the capture of antibody/detection molecule complexes in the trapping zone is indicative of past exposure to HCV.
摘要:
An immunoassay device incorporating porous polymeric capture nanoparticles within either the sample collection vessel or pre-impregnated into a porous substratum within fluid flow path of the analytical device is presented. This incorporation of capture particles within the immunoassay device improves sensitivity while removing the requirement for pre-processing of samples prior to loading the immunoassay device. A preferred embodiment is coreshell bait containing capture nanoparticles which perform three functions in one step, in solution: a) molecular size sieving, b) target analyte sequestration and concentration, and c) protection from degradation. The polymeric matrix of the capture particles may be made of co-polymeric materials having a structural monomer and an affinity monomer, the affinity monomer having properties that attract the analyte to the capture particle. This device is useful for point of care diagnostic assays for biomedical applications and as field deployable assays for environmental, pathogen and chemical or biological threat identification.
摘要:
This invention relates, e.g., to a method for predicting the prognosis, the likelihood of metastasis in, or the desirability of administering an aggressive therapy to, a subject with colorectal cancer, comprising determining, in a sample from the subject, the level of phosphorylation compared to a positive and/or negative reference standard, of one or more of: (a) AKT (S473); (b) BAD (S112); (c) cABL (T735); (d) ERK (T42/44); (e) MARCKS (S152-156); (0 p38MAPK (T180-182): (g) STAT 1 (Y701 ); (h) PTEN (S380); (i) EGFR (Y992); (j) PAK 1/2 (S 1 19/204); or (k) PKC zeta/lambda (T410-403); or the total amount of (1) COX-2 protein; wherein if the level of phosphorylation of one or more of a-i or the total amount of COX-2 protein (1) is elevated compared to the negative reference standard, and/or if the level of phosphorylation of j or k is decreased compared to the positive reference standard, the subject has poor prognosis, is likely to undergo metastasis, and/or is a good candidate for aggressive therapy. Also described are methods for treating subjects likely to develop metastatic colorectal carcinoma, and pharmaceutical compositions and kits for implementing methods of the invention.
摘要:
An aircraft which is designed for remote controlled slow flight, indoor or in a small outdoor yard or field. The aerial lifting body is defined by a series of lightweight planar or thin airfoil surfaces (A1, A2, A3, A4) arranged in a radially symmetrical configuration. Suspended within the cavity (O) formed by the thin airfoil surfaces (A1, A2, A3, A4) is a thrust generating propeller system (C) that is angled upwardly and that can be regulated remotely so as to change the angle of the thrust vector within the cavity (O) for steering. Lifting, stability, turning, and general control of the direction of motion in flight is accomplished without any formal wings, rudder, tail, or control surfaces.