Provided is an M2-LVP-K1 virus including a colorectal cancer cell-specific mutant sialic acid binding domain and a composition for treating colorectal cancer including the same. The mutant sialic acid binding domain is constructed using directed evolution technology, and is a recombinant Newcastle disease virus constructed by substituting a normal sialic acid binding domain for a HN protein, a cell-binding receptor, to improve the specific infectivity to HCT116 cells. It was identified that M2-LVP-K1 recombinant Newcastle disease virus with improved colorectal cancer cell-specific infectivity has improved HCT116 cell death effect compared to the conventional normal recombinant Newcastle disease virus, and produces an excellent effect in inhibiting cancer tissue growth through in vivo experiments. The mutant recombinant Newcastle disease virus presented in this study relates to a therapeutic viral agent capable of inducing clinical symptom reduction, partial remission, or complete remission through colorectal cancer cell death or colorectal cancer tissue shrinkage.

The present application discloses a recombinant Newcastle disease virus genome, a recombinant Newcastle disease virus rNDV-VEGF-Trap containing the genome and a preparation method therefor, a DNA molecule encoding the recombinant Newcastle disease virus genome, and a use of the genome and the recombinant Newcastle disease virus in the preparation of a drug for treating cancer. The recombinant Newcastle disease virus provided by the present application relates to inserting a coding gene of VEGF-Trap into the genome of the recombinant Newcastle disease virus, such that the recombinant Newcastle disease virus obtained therefrom is replicated with a strong replication capability, thereby killing host cancer cells; moreover, the recombinant Newcastle disease virus has reliable safety for non-cancer cells, and shows improved anti-tumor effect and oncolytic efficiency.

In this study, for the first time, protective efficacy of gD against ILTV challenge was evaluated. Immunization with recombinant Newcastle disease virus expressing ILTV gD induced a higher level of neutralizing antibodies and offered complete protection to chickens against lethal ILTV challenge. Uses of recombinant NDV as a vaccine vector are also described.

The present invention provides chimeric negative-stand RNA viruses that allow a subject, e.g., an avian, to be immunized against two infectious agents by using a single chimeric virus of the invention. In particular, the present invention provides chimeric influenza viruses engineered to express and incorporate into their virions a fusion protein comprising an ectodomain of a protein of an infectious agent and the transmembrane and cytoplasmic domain of an influenza virus protein. Such chimeric viruses induce an immune response against influenza virus and the infectious agent. The present invention also provides chimeric Newcastle Disease viruses (NDV) engineered to express and incorporate into their virions a fusion protein comprising the ectodomain of a protein of an infectious agent and the transmembrane and cytoplasmic domain of an NDV protein. Such chimeric viruses induce an immune response against NDV and the infectious agent.

Described herein are chimeric Newcastle disease viruses engineered to express an agonist of a co-stimulatory signal of an immune cell and compositions comprising such viruses. Also described herein are chimeric Newcastle disease viruses engineered to express an antagonist of an inhibitory signal of an immune cell and compositions comprising such viruses. The chimeric Newcastle disease viruses and compositions are useful in the treatment of cancer. In addition, described herein are methods for treating cancer comprising administering Newcastle disease viruses in combination with an agonist of a co-stimulatory signal of an immune and/or an antagonist of an inhibitory signal of an immune cell.

An altered avian NDV that contains the coding sequence of avian interleukin-4 (IL-4), or a portion thereof, in the reverse orientation suppresses in-ovo IL-4 production via RNAi when administered to embryonic birds. An immunogenic composition containing this altered NDV is included in this invention. The altered avian NDV can, optionally contain a polynucleotide encoding a heterologous antigen from a heterologous avian pathogen and can produce said heterologous antigen in-ovo.

A recombinant Newcastle disease virus and a preparation method therefor, a recombinant plasmid, and use of the recombinant Newcastle disease virus or the recombinant plasmid. The recombinant Newcastle disease virus is obtained by replacing an F protein of a Newcastle disease virus lasota with an F protein encoded by a DNA as set forth in SEQ ID NO: 1 at positions 7274-8935 from a 5-terminus. The recombinant Newcastle disease virus is safe and capable of effectively inhibiting tumour cells and promoting tumour cell apoptosis.

Described herein are chimeric Newcastle disease viruses engineered to express an agonist of a co-stimulatory signal of an immune cell and compositions comprising such viruses. Also described herein are chimeric Newcastle disease viruses engineered to express an antagonist of an inhibitory signal of an immune cell and compositions comprising such viruses. The chimeric Newcastle disease viruses and compositions are useful in the treatment of cancer. In addition, described herein are methods for treating cancer comprising administering Newcastle disease viruses in combination with an agonist of a co-stimulatory signal of an immune and/or an antagonist of an inhibitory signal of an immune cell.

Provided are an oncolytic heterologous recombinant Newcastle disease virus (NDV), preparation method and application thereof. The heterologous recombinant NDV can express alpha (1,3) galactosyltransferase (1,3GT). The 1,3GT is the protein represented by the flowing B1) and B2): B1) the protein has an amino acid sequence of SEQ ID No.1; and B2) the protein is derived from B1) and has a function of 1,3GT obtained by substituting and/or deleting and/or adding one or more amino acid residue(s) in the amino acid sequence represented by SEQ ID No.1. The recombination NDV can be used for tumor treatment.

Described herein are chimeric Newcastle disease viruses engineered to express an agonist of a co-stimulatory signal of an immune cell and compositions comprising such viruses. Also described herein are chimeric Newcastle disease viruses engineered to express an antagonist of an inhibitory signal of an immune cell and compositions comprising such viruses. The chimeric Newcastle disease viruses and compositions are useful in the treatment of cancer. In addition, described herein are methods for treating cancer comprising administering Newcastle disease viruses in combination with an agonist of a co-stimulatory signal of an immune and/or an antagonist of an inhibitory signal of an immune cell.