Antibody against glypican-3 and application thereof

1. An antibody that specifically recognizes glypican-3, comprising within an antibody molecule:

a light chain variable region comprising V L CDR1 having the sequence of SEQ ID NO: 16, V L CDR2 having the sequence of SEQ ID NO: 18, and V L CDR3 having the sequence of SEQ ID NO: 20; and a heavy chain variable region comprising V H CDR1 having the sequence of SEQ ID NO: 10, V H CDR2 having the sequence of SEQ ID NO: 12, and V H CDR3 having the sequence of SEQ ID NO: 14.

2. The antibody of claim 1 , wherein the heavy chain variable region of the antibody has the sequence shown in positions 1-121 of SEQ ID NO: 4, and the light chain variable region of the antibody has the sequence shown in positions 137-247 of SEQ ID NO: 4.

3. A multifunctional immunoconjugate, comprising:

the antibody of claim 1 ; and

a functional molecule linked thereto,

wherein the functional molecule includes at least one selected from the group consisting of a molecule targeting a tumor surface marker, a tumor-suppressing molecule, a molecule targeting a surface marker of an immune cell, and a detectable label, and

wherein the immune cell comprises a T lymphocyte, an NK cell or an NKT cell.

4. The multifunctional immunoconjugate of claim 3 , wherein the molecule targeting the tumor surface marker is an antibody or ligand that binds to the tumor surface marker; or

the tumor-suppressing molecule is an anti-tumor cytokine or anti-tumor toxin, and the anti-tumor cytokine includes at least one selected from the group consisting of IL-12, IL-15, IFN-beta, and TNF-alpha.

5. The multifunctional immunoconjugate of claim 3 , wherein the detectable label includes a fluorescent label or a chromogenic label.

6. The multifunctional immunoconjugate of claim 4 , wherein the antibody that binds to the tumor surface marker is an antibody that recognizes an antigen other than glypican-3, wherein the antigen includes EGFR, EGFRvIII, mesothelin, HER2, EphA2, Her3, EpCAM, MUCI, MUC16, CEA, Claudin 18.2, folate receptor, Claudin 6, WT1, NY-ESO-1, MAGE 3, ASGPR1, or CDH16.

7. The multifunctional immunoconjugate of claim 3 ,

wherein the immune cell comprises a T lymphocyte, an NK cell or an NKT cell, and

wherein the molecule targeting the surface marker of the immune cell is an antibody that binds to a T cell surface marker, thereby forming a T-cell-engaging bifunctional antibody with the antibody of claim 1 .

8. The multifunctional immunoconjugate of claim 7 , wherein the antibody that binds to the immune cell surface marker is an anti-CD3 antibody.

9. The multifunctional immunoconjugate of claim 3 , wherein the multifunctional immunoconjugate is a fusion peptide, and further comprises a linker peptide between the antibody and the functional molecule linked thereto.

10. A chimeric antigen receptor, comprising

the antibody of claim 1 , a transmembrane region, and an intracellular signal region.

11. The chimeric antigen receptor of claim 10 , wherein the transmembrane region comprises a transmembrane region of CD8 or CD28.

12. The chimeric antigen receptor of claim 11 , comprising:

a) the antibody of claim 2 , the transmembrane region of CD8, and the intracellular signal region of CD3ζ; or

b) the antibody of claim 2 , the transmembrane region of CD8, the intracellular signal region of CD137, and the intracellular signal region of CD3ζ; or

c) the antibody of claim 2 , the transmembrane region of CD28 molecule, the intracellular signaling region of CD28 molecule, and the intracellular signal region of CD3ζ; or

d) the antibody of claim 2 , the transmembrane region of CD28 molecule, the intracellular signaling region of CD28 molecule, the intracellular signal region of CD137, and the intracellular signal region of CD3ζ.

13. The chimeric antigen receptor of claim 10 , wherein the antibody is a single chain antibody.

14. The chimeric antigen receptor of claim 10 , wherein the chimeric antigen receptor comprises:

SEQ ID NO: 49 or the amino acid sequence shown in positions 22-346 thereof;

SEQ ID NO: 50 or the amino acid sequence shown in positions 22-447 thereof;

SEQ ID NO: 51 or the amino acid sequence shown in positions 22-491 thereof;

SEQ ID NO: 52 or the amino acid sequence shown in positions 22-494 thereof; or

SEQ ID NO: 53 or the amino acid sequence shown in positions 22-536 thereof.

15. An isolated genetically modified immune cell, comprising the chimeric antigen receptor of claim 10 .

16. The isolated genetically modified immune cell of claim 15 , further comprising an exogenous encoding sequence for a cytokine.

17. The isolated genetically modified immune cell of claim 15 , further comprising another chimeric antigen receptor which does not contain CD3ζ but contains the intracellular signaling domain of CD28, or the intracellular signaling domain of CD137, or a combination of both.

18. The isolated genetically modified immune cell of claim 15 , further comprising a chemokine receptor.

19. The isolated genetically modified immune cell of claim 15 , wherein the genetically modified immune cell is a modified T lymphocyte, NK cell or NKT cell.

20. A method for preparing a drug inhibiting a tumor expressing glypican-3, comprising a step of:

mixing the genetically modified immune cell of claim 15 with a pharmaceutically acceptable carrier.

21. A pharmaceutical composition comprising:

an antibody that specifically recognizes glypican-3; or

an immunoconjugate;

and a pharmaceutically acceptable carrier;

wherein the immunoconjugate comprises the antibody and a functional molecule linked thereto,

and

the antibody comprises within an antibody molecule:

a light chain variable region comprising V L CDR1 having the sequence of SEQ ID NO: 16, V L CDR2 having the sequence of SEQ ID NO: 18, and V L CDR3 having the sequence of SEQ ID NO: 20; and a heavy chain variable region comprising V H CDR1 having the sequence of SEQ ID NO: 10, V H CDR2 having the sequence of SEQ ID NO: 12, and V H CDR3 having the sequence of SEQ ID NO: 14.

22. The isolated genetically modified immune cell of claim 18 , wherein the chemokine receptor includes CCR2.

23. The chimeric antigen receptor of claim 10 , wherein the intracellular signal region includes at least one intracellular signal region sequence selected from the group consisting of CD3ζ, FcεRIγ, CD27, CD28, CD137, CD134, MyD88, and CD40.

24. The antibody of claim 2 , wherein the antibody is a single chain antibody.

25. The antibody of claim 24 , wherein the single chain antibody is an scFv.

26. The antibody of claim 25 , wherein the scFv comprises SEQ ID NO: 4.