Yamaguchi University

National Cancer Center

Noile-immune Biotech, Inc.

National University Corporation Totori University

National University Corporation Tottori University

Yukimi Sakoda

Koji Tamada

Keishi Adachi

Tetsuya Nakatsura

Keigo Saito

Takafumi Nakamura

An object of the present invention is to provide: an anti-GPC3 antibody that recognizes an epitope different from that for existing antibodies (e.g., GC33 and GC199) and can specifically bind, even in the form of single chain antibody, to GPC3 localized on a cell membrane; CAR comprising the anti-GPC3 single chain antibody; an immunocompetent cell expressing the CAR; a gene of the anti-GPC3 antibody or a gene of the CAR; a vector comprising the anti-GPC3 antibody gene or the CAR gene; a host cell in which the vector has been introduced; a method for specifically detecting GPC3; and a kit for specifically detecting GPC3. An antibody comprising particular heavy chain CDR1 to CDR3 and particular light chain CDR1 to CDR3 defined in claim, and specifically binding to a human-derived GPC3 polypeptide specifically binds to GPC3 localized on a cell membrane. CAR-immunocompetent cells prepared on the basis of CAR comprising such single chain antibody are useful for cancer immunotherapy.

Anti-GPC3 antibody

It is to provide an immunocompetent cell that expresses regulatory factors of immunocompetent cell immune function and possesses all of proliferative potential, viability, and the ability to accumulate a T cell, and an expression vector of regulatory factors of immune function for generating the immunocompetent cell. An immunocompetent cell expressing a cell surface molecule specifically recognizing a cancer antigen, interleukin 7 (IL-7), and CCL19 is generated. Preferably, the cell surface molecule specifically recognizing a cancer antigen is T cell receptor specifically recognizing the cancer antigen, and the immunocompetent cell is a T cell.

Immunocompetent cell and expression vector expressing regulatory factors of immune function

An object of the present invention is to provide an enhancer for endogenous T-cells or B-cells having a memory function and a malignant tumor recurrence inhibitor in order to continue to reject malignant tumor over a long period of time. An enhancer for T-cells or B-cells having a memory function in an administration subject, comprising a nucleic acid delivery vehicle, a nucleic acid encoding interleukin-7 (IL-7), and a nucleic acid encoding chemokine (C-C motif) ligand 19 (CCL19), and an inducer for inducing a memory function in T-cells or B-cells in an administration subject, are prepared. Also, a malignant tumor recurrence inhibitor comprising a nucleic acid delivery vehicle, a nucleic acid encoding interleukin-7 (IL-7), and a nucleic acid encoding CCL19, is prepared.

Enhancer for T-cells or B-cells having memory function, malignant tumor recurrence inhibitor, and inducer for inducing memory function in T-cells or B-cells

An object of the present invention is to provide CAR-expressing T cells that coexpress a chimeric antigen receptor (CAR) and a T cell immune function-enhancing factor and have a high immunity-inducing effect and antitumor activity, and to provide a CAR expression vector for the preparation of the CAR-expressing T cells. A CAR expression vector comprises a nucleic acid encoding a chimeric antigen receptor (CAR) and a nucleic acid encoding a T cell immune function-enhancing factor, wherein the nucleic acid encoding an immune function-enhancing factor is a nucleic acid encoding interleukin-7 and a nucleic acid encoding CCL19, a nucleic acid encoding a dominant negative mutant of SHP-1, or a nucleic acid encoding a dominant negative mutant of SHP-2, or a CAR-expressing T cell introduced with the CAR expression vector are prepared.

CAR expression vector and CAR-expressing T cells

Car expression vector and car-expressing T cells

Growing community of inventors

Yamaguchi, Japan

Yukimi Sakoda