Abstract: A Claudin18.2 humanized antibody and application thereof. The antibody contains a chain variable region (CDR) sequence selected from at least one of the following or an amino acid sequence having at least 90% identity therewith: light chain CDR sequences: SEQ ID NOs: 1-3 and 7-9; and heavy chain CDR sequences: SEQ ID NOs: 4-6 and 10-12; The antibody or an antigen-binding fragment thereof have humanized modification. The humanized antibody can specifically target and bind Claudin18.2, has the same in vitro activity as a human-mouse chimeric anti-Claudin18.2 monoclonal antibody, meets the requirements of druggability, and has significantly prolonged in vivo half-life.

Abstract: An antibody, or an antigen-binding fragment thereof, or a chimeric antigen receptor having the ability of specifically recognizing CLDN18.2. The antibody or antigen-binding fragment thereof, or chimeric antigen receptor comprises at least one CDR sequence selected from the following or an amino acid sequence having at least 95% identity with it: the CDR sequence of light chain variable region shown in SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 7, SEQ ID NO: 8 and SEQ ID NO: 9; the CDR sequence of heavy chain variable region shown in: SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 10, SEQ ID NO: 11 and SEQ ID NO: 12.

Abstract: Provided is a set of viral vectors, comprising: a first viral vector that carries a first nucleic acid molecule encoding an envelope protein, and a second viral vector that carries a second nucleic acid molecule encoding a fusion protein, the fusion protein comprising: a single-chain antibody capable of binding to CD28 or CD3, and a C-terminal domain, comprising a transmembrane region and an intracellular region, of the envelope protein. The C terminal of the single-chain antibody is connected to the N terminal of the C-terminal domain of the envelope protein, and the envelope protein and the fusion protein are in a non-fusion form. Also provided are a method for obtaining a lentivirus and an obtained lentivirus, a method for introducing a lentivirus into an unactivated T lymphocyte, a method for expressing a target gene, a method for obtaining a CAR-T cell and an obtained CAR-T cell, a pharmaceutical composition, and a use thereof.

Abstract: An antibody or an antigen-binding fragment thereof capable of specifically recognizing IL-11. The antibody includes heavy chain variable region CDRs as shown in SEQ ID NOs: 4-6, light chain variable region CDRs as shown in SEQ ID NOs: 37-39, heavy chain framework regions as shown in SEQ ID NOs: 67-70, and light chain framework regions as shown in SEQ ID NOs: 71-74, respectively. The antibody has low immunogenicity and can specifically target and bind to IL-11, so as to block binding of IL-11 to an IL-11 receptor.

Abstract: A group of viral vectors including: first viral vector, wherein first viral vector carries first nucleic acid molecule, and the first nucleic acid molecule encodes envelope protein; second viral vector, wherein second viral vector carries second nucleic acid molecule, the second nucleic acid molecule encodes fusion protein, the fusion protein includes single-chain antibody and C-terminal domain of envelope protein, the C-terminal domain of envelope protein includes transmembrane region and intracellular region of envelope protein, the C-terminus of single-chain antibody connects with N-terminus of C-terminal domain of envelope protein, the single-chain antibody targets a specific antigen; first nucleic acid molecule and second nucleic acid molecule are arranged to express envelope protein and fusion protein, and the envelope protein and the fusion protein are in non-fusion form.

Abstract: A humanized antibody or antigen-binding fragment thereof capable of specifically recognizing TrkA and uses thereof. The antibody includes a heavy chain variable region with an amino acid sequence shown in any one of SEQ ID NO: 2-8, and a light chain variable region with an amino acid sequence shown in any one of SEQ ID NO: 10-13. The above-mentioned antibody according to the embodiments of the present invention can specifically target and bind to the TrkA receptor and block the binding of NGF and TrkA.

Abstract: An invention provides a chimeric antigen receptor. The chimeric antigen receptor includes an extracellular domain including a heavy chain variable region, a light chain variable region of a single chain antibody fragment and CD8 hinge region; a transmembrane domain including an immune co-stimulator transmembrane domain; and an intracellular domain including an immune co-stimulator intracellular segment and CD3? chain. According to the embodiments of the invention, the chimeric antigen receptor can specifically recognize the tumor cells expressing the specific antigen and achieve the specific killing effect against the tumor cells expressing the high specific antigen.

Abstract: An antibody or an antigen-binding fragment thereof is capable of specifically recognizing TrkA and uses thereof. The antibody contains a CDR sequence selected from at least one of the following or an amino acid sequence having at least 95% identity with it: heavy chain variable region CDR sequences: SEQ ID NO: 1˜27, light chain variable region CDR sequences: SEQ IN NO: 28˜54. The above antibody can specifically targeted-bind to the TrkA receptor and block the binding of NGF to TrkA.