Granted Patent
B2
US 12,404,491 · App. 16/943,400 · Granted Sep 2, 2025
Methods for enhancing efficacy of therapeutic immune cells
Assignee:
NATIONAL UNIVERSITY OF SINGAPORE
C12N5/0646A61K40/11A61K40/15A61K40/31A61K40/4211A61K40/4224C07K16/2809C07K16/2833C07K16/289C12N5/0636A61K2239/48C07K2319/03C12N2510/00
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Abstract
The present invention relates to a method of using a receptor (e.g., chimeric antigen receptor—CAR) that activates an immune response upon binding a cancer cell ligand in conjunction with a target-binding molecule that targets a protein or molecule for removal or neutralization to generate enhanced anti-cancer immune cells. The present invention also relates to engineered immune cells having enhanced therapeutic efficacy and uses thereof.
Claims (26)
1. An in vitro method for producing an engineered immune cell, the method comprising: introducing into an immune cell (i) a first polynucleotide sequence encoding an immune activating receptor comprising a first binding domain that binds to a molecule expressed on the surface of a cancer cell, and (ii) a second polynucleotide sequence encoding a target-binding molecule linked to a localizing domain, wherein the target-binding molecule comprises a second binding domain that binds to a target of the immune cell, and wherein the target-binding molecule linked to the localizing domain downregulates expression of the target of the immune cell, thereby producing an engineered immune cell,
wherein the engineered immune cell retains similar or higher (i) expression of the immune activating receptor, (ii) expression of a T cell activation marker, (iii) T cell proliferation, or (iv) any combination thereof, as compared to that of an otherwise identical immune cell that comprises the first polynucleotide sequence but not the second polynucleotide sequence,
wherein the second polynucleotide sequence comprises, from 5′ terminus to 3′ terminus, a first nucleotide sequence encoding the second binding domain, a second nucleotide sequence encoding a peptide linker, and a third nucleotide sequence encoding the localizing domain, and wherein the peptide linker comprises at least 5 amino acids, and
wherein the molecule expressed on the surface of the cancer cell and the target of the immune cell are the same.
2. The in vitro method of claim 1 , wherein the localizing domain 3 comprises an ER retention sequence, a Golgi retention sequence, or a PEST sequence.
3. The in vitro method of claim 1 , wherein the first polynucleotide sequence and the second polynucleotide sequence are on the same polynucleotide molecule.
4. The in vitro method of claim 3 , further comprising an internal ribosomal entry site or a 2A peptide-coding region site between the first polynucleotide sequence encoding the immune activating receptor and the second polynucleotide sequence encoding the target-binding molecule linked to a localizing domain.
5. The in vitro method of claim 2 , wherein the localizing domain comprises an ER retention sequence.
6. The in vitro method of claim 5 , wherein the ER retention sequence comprises a KDEL amino acid sequence.
7. The in vitro method of claim 5 , wherein the ER retention sequence comprises a KKXX amino acid sequence, wherein X represents any amino acid.
8. The in vitro method of claim 2 , wherein the localizing domain comprises a Golgi retention sequence.
9. The in vitro method of claim 8 , wherein the Golgi retention sequence comprises a YQRL amino acid sequence.
10. The in vitro method of claim 2 , wherein the localizing domain comprises a PEST sequence.
11. The in vitro method of claim 1 , wherein the immune cell is a T cell.
12. The in vitro method of claim 1 , wherein the immune cell is a natural killer (NK) cell.
13. The in vitro method of claim 1 , wherein the second binding domain is a single chain binding domain.
14. The in vitro method of claim 13 , wherein the single chain binding domain is a single chain variable fragment (scFv).
15. The in vitro method of claim 1 , wherein the target-binding molecule linked to a localizing domain further comprises a transmembrane domain.
16. The in vitro method of claim 15 , wherein the transmembrane domain is a CD8 transmembrane domain.
17. The in vitro method of claim 1 , wherein the immune activating receptor is a chimeric antigen receptor (CAR) comprising the first binding domain, a signaling domain, and a costimulatory domain.
18. The in vitro method of claim 1 , wherein the first binding domain and the second binding domain have the same sequence.
19. The in vitro method of claim 1 , wherein the second binding domain and the first binding domain are different.
20. The in vitro method of claim 17 , wherein the signaling domain comprises a CD3ζ, a Fc, a DAP10, or a DAP12 domain.
21. The in vitro method of claim 17 , wherein the costimulatory domain comprises a 4-1BB domain, a CD28 domain, a CD28 LL→GG variant domain, an OX40 domain, an ICOS domain, a CD27 domain, a GITR domain, a HVEM domain, a TIM1 domain, a LFA1 domain, or a CD2 domain.
22. The in vitro method of claim 1 , wherein the second polynucleotide sequence further comprises a nucleotide sequence encoding a signal peptide.
23. The in vitro method of claim 1 , wherein the first binding domain is a first single chain variable fragment (scFv) and the second binding domain is a second scFv.
Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Aug 17, 2022
From: CAMPANA, DARIO; KAMIYA, TAKAHIRO
To: NATIONAL UNIVERSITY OF SINGAPORE
Reel/Frame 060835/0591 →
Continuity (4)
Continuation
15548577
Provisional Application
62130970
· Mar 10, 2015
Provisional Application
62112765
· Feb 6, 2015
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