74 results about "H5N1 virus" patented technology

The present invention relates to targets for Human microRNAs in Avian Influenza Virus (H5N1) Genome and provides specific miRNA targets against H5N1 virus. Existing therapies for Avian flu are of limited use primarily due to genetic re-assortment of the viral genome, generating novel proteins, and thus escaping immune response. In animal models, baculovirus-derived recombinant H5 vaccines were immunogenic and protective, but results in humans were disappointing even when using high doses. Currently, two classes of drugs are available with antiviral activity against influenza viruses: inhibitors of the M2 ion channel, amantadine and rimantadine, and inhibitors of neuraminidase, oseltamivir, and zanamivir. There is paucity of information regarding effectiveness of these drugs in H5N1 infection. These drugs are also well known to have side effects like neurotoxicity. Thus there exists a need to develop alternate therapy for targeting the Avian flu virus (H5N1). The present invention addresses this need in the field.

No antiviral regimen has been consistently successful in treating H5N1 virus infection. We demonstrate that a group of highly effective siRNAs targeting different H5N1 viral genes shares a unique motif, GGAGU/ACUCC. We further demonstrate that the effectiveness of siRNAs containing this motif is not sequence specific. The results suggested that the structure of the unique motif is critical in determining the potency of siRNA-mediated protective effects against viral infection and this potent in vivo protection is associated with early productions of β-defensin and IL-6 induced by the motif. Provided are methods and prophylactic and therapeutic agents useful against other viral infections in addition to the H5N1 influenza virus.

Disclosed by the invention are an immunoassay kit and an immunoassay method for detecting highly pathogenic avian influenza virus subtype H5N1 rapidly, conveniently and specifically. Also disclosed are an immunochromatographic detection kit and an immunochromatographic detection method for detecting the virus subtype H5N1 rapidly, conveniently and specifically. It is found that a monoclonal antibody 4G6 produced by using the virus subtype H5N1 as an immunogen does not react with the subtype H5N2 virus or a subtype H5N3 virus and reacts only with a subtype H5N1 virus specifically. It is also found that only an avian influenza virus subtype H5N1 can be detected specifically by an immunoassay utilizing the monoclonal antibody 4G6. It is further found that the sensitivity of the detection of immunochromatography can be increased by adding a nonionic surface and a water-soluble vinyl polymer having a polar group containing an oxygen atom and a nitrogen atom to a developing solution to be used in the immunochromatography.

The invention provides for anti-pathogen vaccines produced in recombinant bacteria and/or transgenic plants and administered through standard vaccine introduction methods or oral administration. In one embodiment, the vaccine is administered through the consumption of the edible plant as food, or the bacteria administered orally. The present invention also provides a method of using genetically modified microorganisms, such as lactic acid bacteria, including Lactococcus lactis strains, as oral vaccines. In one embodiment, Lactococcus lactis expressing the avian influenza HA gene can be used as an oral vaccine for protection against H5N1 virus infection. In another embodiment, said Lactococcus lactis is administered as an oral vaccine in conjunction with an adjuvant such as cholera toxin B.

In one embodiment, the present invention provides for an edible mini-capsule form of live, non-persisting, recombinant Lactococcus lactis (L.lactis) vaccine against a pathogen such as the highly virulent influenza H5N1 strain. Enteric coated capsule of the present invention induced high levels of hemagglutinin-specific serum IgG and fecal IgA antibody production after oral administration in mice and chickens, and rendered complete protection against a lethal challenge of H5N1 virus in mice. The present invention thus demonstrates a broadly applicable platform technology for producing and administering edible vaccines against bacterial and viral infections.

The invention discloses a CTL epitope polypeptide of bird flu H5N1 virus and applications thereof. The CTL epitope polypeptide of bird flu H5N1 virus is shown as (a) or (b); (a) the polypeptide consists of amino acid sequences in the sequence I out of a sequence list; and (b) the polypeptide derives from the sequence 1 by the replacing and/or missing and/or adding of one or more amino acid residues of the amino acid sequence in the sequence 1 and is correlate to the CTL epitope of the bird flu H5N1 virus. The invention also protects the DNA that codes the polypeptide. The epitope polypeptide can be used for preparing the bacterin for the bird flu H5N1 virus and can be also used for preparing the kit for detecting the specific T cell of the H5N1 virus. The CTL epitope polypeptides and the applications thereof have important values.

The invention discloses a humanized antibody for resisting avian influenza H5N1 hemagglutinin (HA) antigen. A heavy chain variable region of the humanized antibody has an amino acid sequence shown in SEQ ID No.1; a light chain variable region of the humanized antibody has an amino acid sequence shown in SEQ ID No.2. In addition, the invention also discloses a preparation method and application of the humanized antibody. The humanized antibody is extensive and widespread in coagulation inhibition activity for avian influenza H5N1 virus, high in affinity and neutralization activity for various subtypes of the HA antigen of the avian influenza H5N1, and capable of recognizing a special conserved region of one H5HA; the humanized antibody is high in neutralization activity and capable of reducing immunogenicity; a recognized epitope is highly conserved in the H5 type influenza virus; the humanized antibody is extensive in application prospect in prevention and treatment and vaccine design of the avian influenza H5N1 in the future.

The invention relates to the field of biological medicines, particularly to an MASA (multi-analyte suspension array) detection kit for influenza virus H5N1 and H7N9 subtypes, and provides a primer pair and a probe for detecting influenza virus surface hemagglutinin antigen H5 and H7 subtypes, a primer pair and a probe for detecting influenza virus neuraminidase antigen N1 and N9 subtypes as well as a kit comprising the primer pairs and the probes and a usage method of the kit. The kit is good in sensitivity, accuracy and specificity and simple, convenient and quick to use, and detection of to-be-detected samples can be finished within four hours. Tests prove that no false positive result exists when the kit is used for detecting negative samples; the detection rate of 100% is realized when the kit is used for detecting samples containing H7N9 subtype viruses and H5N1 subtype viruses only; the H7N9 and H5N1 subtype viruses contained in samples can be completely detected when the kit is used for detecting the samples containing both the H5N1 subtype viruses and the H7N9 subtype viruses. Besides, the kit can be used for effectively detecting to-be-detected samples containing more than 10 copies.

The invention discloses L-leucine derivatives blocking the entrance of H5N1 avian influenza virus, which are 3,4-dyhydroxyl benzoyl leucine methyl ester and 3,4-dyhydroxyl phenylacetyl leucine methyl ester. The 3,4-dyhydroxyl benzoyl leucine methyl ester is prepared by condensing 3,4-dyhydroxyl benzoic acid with L-leucine methyl ester; the 3,4-dyhydroxyl phenylacetyl leucine methyl ester is prepared by taking 3,4-dyhydroxyl phenylacetic acid as a starting material, treating the 3,4-dyhydroxyl phenylacetic acid by virtue of dimethyl sulphate and thionyl chloride sequentially, then condensing the 3,4-dyhydroxyl phenylacetic acid with L-leucine methyl ester, and then performing demethylation reaction. The compounds, namely, the 3,4-dyhydroxyl benzoyl leucine methyl ester and the 3,4-dyhydroxyl phenylacetyl leucine methyl ester, disclosed by the invention, have a strong inhibitory activity on Influenza strain A/Vietnam/1194/2004 avian influenza virus, and have a mechanism of acting on the entrance phase of H5N1 virus infected cells; and the compounds are a new inhibitor resisting the entrance of avian influenza virus, and can be used as a medicine for preventing or treating H5N1 avian influenza.

The present invention is based on the surprising finding that H5 protein of clade 1 H5N1 induces, in particular by a single-shot vaccination, a cross-clade protective immune response to influenza viruses with H5N1 HA. In one aspect, the invention is thus directed to H5 protein of clade 1 H5N1 virus for use in a method of treating or preventing infections with H5N1 virus of a different clade, namely of a clade different from clade 1 or from any clade with the exception of clade 1, respectively.

The invention discloses a CTL epitope polypeptide of an avian influenza H5N1 virus and application thereof. The CTL epitope polypeptide of the avian influenza H5N1 virus is as shown by (a) or (b), wherein (a) is a polypeptide consisting of amino acid sequences shown by a sequence 1 in a sequence table; and (b) is a polypeptide derived from the sequence 1, is obtained by substituting and/or deleting and/or adding one or more amino acid residues for the amino acid sequence of the sequence 1 and is correlative with a CTL epitope of the avian influenza H5N1 virus. The DNA for coding the polypeptide is protected in the invention. The epitope polypeptide can be applied to preparing vaccines aiming at the avian influenza H5N1 virus and also can be applied to preparing a kit for testing specific T cells of the avian influenza H5N1 virus. The CTL epitope polypeptide of the avian influenza H5N1 virus has great values.

The invention relates to an isothermal amplification detection kit for bird flu H5N1 virus and a detecting method thereof. The kit comprises RNA extract, bird flu H5N1 virus nucleic acid isothermal amplification reaction liquid, bird flu H5N1 virus positive control and negative control. The detection kit has the advantages of high specificity, high sensitivity, high reaction speed, suitability for sample detection of both high flux and low flux and no need of complicated instrument in the whole reacting process, wherein only 2 hours are required from treating a single sample to finishing detection.

The invention discloses an actinomyces HA10206 strain for generating substances with antiviral activity, and the preservation number is CGMCC No.4861, and the invention belongs to the field of microbiological technology. The present invention has the advantages that: the actinomyces HA10206 strain is a new species of streptomyces, and the fermentation liquor of the product has obvious inhibition effects on H1N1 and H2N2, H3N2, H5N1 viruses of the same series, and certain inhibition effects on HIV and HBV, thereby the actinomyces HA10206 has good medicament development prospects.

Poly ICLC or liposome-encapsulated Poly ICLC (LE Poly ICLC) in combination with antisense oligonucleotides (AS) act synergistically in post-exposure prophylaxis or therapy of influenza infections, especially H5N1 virus infections.